Big block chevy initial timing. 72 60ft 2015 Dodge Challenger - 11.

Big block chevy initial timing I had a big block with a different timing chain cover and had to make an accurate tdc indicator. Profile Page Most compression BBC's like lots of initial/low end spark advance. shoedoos With the mixture appropriately set, the timing for a race-cammed Chevy big-block can (at a 700- to 900-rpm idle) be as much as 55 degrees. 402 Big Block - Timing and mileage Engine & Drivetrain Register or Log In To remove these I have a nice old '71 Chev 3/4 ton with the 402 BB V8. Dont put too much faith A lower static compression ratio can tolerate more initial timing depending on the camshaft valve duration and overlap. 36 degrees at 3000 rpm with the vacuum disconnected and plugged. Don't worry about where the cam is sitting until you verify tdc. I was always taught when timing your small block chevy, to unplug your vacume advance,plug the hose end and set your initial timing to what you need. 5:1 470 big block (chevy) on 114 race fuel? The cam is a roller with 260 @ . 750-inch lift, Jesel rockers, Holley Strip Dominator intake, 750 Holley A: We would shoot for 34 to 36 degrees total timing at 2,800-3,000 rpm. Disregard the stock timing specs. Or could be different one too. Gear drive doesn't matter. It’s difficult to tell, but it appears the vacuum advance is not connected and that small step can make a big difference in reducing operating temperature especially when combined Running 11. No ping and starts good hot tells you you're at max initial timing for Static timing is a function of essentially setting the timing by hand with the motor not running. In that article they stated that it made its peak HP at 32 degrees total timing. A good ballpark figure is between 36-38 BTDC total timing. in my experience that puts your initial setting too far Here is the reader’s big block Chevy. 9:1 timing big block 402. I would try 16+22+8 For a Chevy big-block, the lobe lift of the intake is a very important factor. After we did this to his, the coil hasn Chevy Forums FREE technical assistance for your restoration and repair. No vacuum advance, two Holley 750DP's (blower carbs). The first is the engine's initial timing, which must be set to Most all BBC's that I have seen tested on an engine dyno require 40 to 43 degrees total timing to make max HP. If you try to run that blown engine at 10* initial you will have an overheating nightmare on your hands and your exhasut temp will be HIGH. Here’s what I’m working with: 350 Chevy approx 9. I was figuring to Big Block Chevy Tuning - tips, timing, idle RPM. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts Again, the engine is a 502 with an 8-71, I am fouling plugs rather quickly. a typical small-block Chevy Every time I drop a distributor into a motor I always get the same questions and comments. But, yeah, the concept is similar: Stock cams get near-stock initial timing; mild cams get a bit more, as the cam gets more duration, the initial timing goes upto a point. If you get starter kick back when warm decrease What should the timing be on a Chevy 454 big block? Total timing would be 36-40 degrees BTDC. 32 deg. New long duration, high lift cam, MSD stuff, 101 cc ported oval port iron heads, approx 10:1 compression ratio, headers, holley 4bbl, etc. contrary to all that BS about welding, brazing, screw in here, beat with a hammer, to properly change a large HEI Initial timing is the number of degrees of ignition timing before top dead center (BTDC) that is set by rotating the distributor body and verified with a timing light. Jump to Latest You should be ok at 10 initial for a big block or small block. Start with 14-15* at idle,without the vacuum advance hooked up. Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially to zero, and the vacuum advance drops Track engines , big cams need higher rpms and generally have locked timing (total) for stable idle, and if not locked generally 18 out to 22/ 24 degs street engines require between 12 and 16/18 depending how wild the cam is. My initail timing is set at 20 with a total of 34*. Your back fire is because the engine running lean as you closed the throtle bores at high RPM on the down shift. For a ball park number, I have my BB (drag altered) set at 38 degrees total timing. Right: Make sure timing marks on the BAD advice to "let the initial timing fall where it will". 872-inch journal diameter), the lobe can, for a given duration, have a Most healthy Big Blocks like about 10-12 degrees initial timing and 38-40 total. Initial big block timing. Get somebody that knows to demonstrate and explain base timing, advance speed (curve), and total timing to you, as Scotty has said. com: User Name: did not give beginning RPM to set carb at for initial timing before going up the 2500 they talked about. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more! I have a 454 big block with a few modifications in my 75 K5 and was wondering what proper timing should be. At that time I thought that 32 degrees seemed low for a big block Chevy as I always set big block timing anywhere from 38-42 degrees for a racing set-up. e. It has a Jones HR cam, 110 separation, . I've got a . do u run a little more with the factory stuff in a performance engine As of right now with idle at 725 RPM the timing is 11 deg. Because the cam is physically bigger (1. What timing for a 402 big block. I read an article in Hot Rod magazine regarding their dyno test on the ZZ572/720R GM crate engine. The valve duration and overlap of your new camshaft is not far from stock specifications. 600 lift, 240-ish duration at 0. 4119 posts All you guys seem to run a lot of initial timing with good results, don't see why my car would be any different. 050 hydraulic roller. Engine now starts on the initial, then builds vacuum, and pulling in the added IDLE timing, 14 initial, add 10, 24 IDLE degrees, simple dimple. The timing belts on these engines ensure that the truck runs smoothly, and since they stretch with age, they can start jumping gear teeth. Cam Big Block Chevy guys. its 32 degrees. 8:1-9. and when i plugged the vacuum line back on it went about an inch off the scale With that tune-up, it starts immediately, the throttle response is surprisingly crisp and quick for a big motor, and it made 710 ft lbs and 781 hp on the dyno. They also generally like about as much initial timing as your distributor can muster. . cdahl383 Discussion starter. Usually for stock chevy around 4-6 degrees btdc at idle. That would be at 3,000–4,000 RPM’s or until you see the timing stop advancing. Chevy is the "Heartbeat of America". Needing more than about 15 degrees initial timing is a sign of screwed-up idle circuits in the carb. To avoid detonation, you can use the following guideline to set the initial timing for best performance:. Those stock BBC heads have very slow flame travel and that big piston is a long way to travel across. The Mazda CX-5 Recommended Idle RPM for Chevy 350: The idle timing for a Chevy 350 is likely around 700 RPM, but as it warms up, it will increase to 1200 RPM or more. Not even on the timing mark!!! How does that XE284 So I recently got my 350 going and need recommendations for initial timing. For instance, I have my initial timing set at right under 16 degrees. big block Chevy powered. Carbs are set good. 491/brodix race rites, 10. , the 34-36 degrees at high rpm that most SBC's like). I run 24 initial and 36 total, and i am at 14 pounds of boost right now. Save Share 1965 Chevy Biscayne 460cid, 10:1cr, Brodix RRO 270, "Old School" 229/241, AED 950 HO, Air Gap, 1-7/8 headers, 3" true dual exhaust Actually,you should set the initial at more like 550-600 rpms if at all possible because if the springs are real light/or weak in the dist the mech adv can be partially activated at 700-750rpms in some cases which will upset the intial timing setting. Chevy Tri Five Forum 76K members. The initial timing should be 4 degrees before top dead center (BTDC). total with all in @ 3200RPM. Learn how to time it for total timing (engine running) and static timing (engine off). I know about 36 to 38 with aluminum, but this is with good aftermarket combustion chambers . 700-inch lift on the intake and 235 cfm at 0. The HEI vacuum advance canister should remain disconnected. Low speed drivability. com FREE DELIVERY possible on eligible purchases Includes initial monthly payment and I also have a 454 Big Block LS-6 in my car with a fairly big Comp solid roller cam and I use a MSD distributor. Un hook the vaccuum advance when you do this, Guy timing a big block chevy. I used to run this engine at about 22 Buy Rollmaster CS2040 Billet Roller Timing Set with Torrington Bearing for Big Block Chevy: Sets & Kits - Amazon. i bought the motor used and i put new gaskets thru out, new timing chain. So, lets say 14 initial, set the vacuum advance degrees stop to give 10 crankshaft degrees, time the initial, and plug the vacuum advance into full manifold vacuum. 5 to 1,Torkker II intake with a Holley It depends on your set up/ specs, but for most blown small blocks I would think 18-22 initial, with 32-36 total. This video contains information about I'm at approx 21-22 initial with the black bushing limiting mechanical to 18 with a heavy/light spring combo in my billet MSD. Well I am assuming your foot went off the gas and Then that will be 16-18 initial + 20 deg mech setup in dist (all in by 2800-3krpms) for a 36-38 max total which is a good place to start for dialing things in. a retarded timing reading). Hopefully the mechanical advance will be in the 20* range and put your Put your timing light on it, read it and then pull your timing back 2 degrees. On small- and big-block Chevy engines, the Number One cylinder is always the driver’s side front. Get it warm again and retest. Dont worry too much about initial timing,this doesent matter a whole lot with a performance build. 3 with BP 98 As mentioned run a HD Clutch fan and shroud works best GM Has done the RND for you it In this Episode, we check cam timing on our 496 Big Block Chevy. 5:1 big block chevy, aluminum heads. With this tune-up, it starts immediately, the throttle response is surprisingly crisp and quick for a big motor, and it made 710 ft lbs and 781 hp on the dyno. initial with very light springs for a steep curvei've run at Before we go further, another way to improve idle quality is with sufficient ignition timing. Vacuum Advance and Mechanical Advance: – He did say someone in East Tennessee built it and I'm kind of leaning towards a Skip White engine. Big Cams Need More Initial Ignition Timing. I checked the timing on the engine and it shows about 17 or 18 degrees at idle (750 RPM)--I didn't have a helper so I couldn't check higher RPMs. There needs to be defined settings, even for initial. with rpms at 850 vacuum hooked up to carb metering block its 30 degrees at 850 rpms unhooked its 22 degrees. 3 in mine Alloy heads block with 36 locked out timing on BP 98 iron head iron block max I would go is 10. 454 initial timing Engine & Drivetrain Register or Log In To remove 1976 GMC SIERRA CLASSIC CAMPER SPECIAL! 454 BIG BLOCK BABY! 04-05-2012, 02:36 PM #2: storm9c1 *** That's interesting *** 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6. Your cam will also like extra timing at idle. Save Share Reply Quote Like. Music: Nviro - Flares (NCS Rele Part TwoSetting the initial timing on a Chevy small block. Then it can be fine tuned with the timing light after. But your dieseling is an issue since it is Small block Chevys (and most other GM performance V8 engines) perform best when the total timing (full centrifugal advance plus the initial timing setting with vacuum What is a recomended initial lead timing on a 14. Your initial timing needs to be "around" the 5-20 degree range, depending on the amount of total advance built into the distributor. 050 Will like a lot of initial timing with that cam. Also, is this the 66954RC Proform distributor rebuild kit? C3 Tech/Performance - 69 427 Total timing - Want to make sure Im setting the total timing correctly. Harmonic balancers have been known to spin too. A note on not using too much initial: As I said above, my motor and others tend to like a lot of initial timing. Top. 050" degrees duration, iron heads. Start the engine. I don't know which way it is on Chevys. Your modern aluminum heads and just over 4-inch bore suggest less total advance is needed than say a big-block Chevy. The timing on stock 396, 402, 427 and 454 engines is 32-34 degrees total advance at 3500 rpm. Stick your thumb over the hole. Once the cam is in the block, pop the big sprocket off the cam so we can install the whole timing set. 1972 Chevy Nova - 12. (I can't vouch whether the sticker is original or not) 2) When adjusting the valves while the engine is running, how much oil should be coming out of the rocker arm holes? A dribble? A steady Initial is determined by which curve you use and therefore is not used to set timing but it should end up around 12-16, depending on your idle speed (if the curve used is a good one). Change the springs and do it again. I run 12lbs of boost on pump gas. I run a 4sd and have the idle set at 900-950. See Alright guys. No specs available from PO. Timing set at 18° initial, 28° with vacuum advance and a Chevrolet big-block V8 engines were introduced in the late 1950s and have powered many medium-duty trucks and heavy car models ever since. Right now you are 12+22+8-10=42-44. I set the initial timing to 12° with vacuum advance disconnected and plugged and with full manifold vacuum it goes to 20°. Set the timing with the vacuum advance hooked up so you can do vacuum and mechanical advances at the same time. Today we FINISH our "How to Build a Big Block Chevrolet" Series. Read the number on the timing plate adjacent to the timing mark on the balancer. New posts Search forums. What is the initial timing for a 454 Chevy? Re: 454 initial timing 16 – 18 degrees of initial timing. Less initial can make these big motors a bit lazy with throttle response. Discussion in 'The Hokey Ass Message Board' started by BOSTONCAMARO, Oct 9, 2012. i run mine at about 14 deg. I aim for around 36 degrees or so on a big block Chevy, total timing "all in", but with the vacuum hose disconnected. Maintaining idle stability as cam duration increases mandates On my msd 6al-2 6530 I have my initial at 46, And I pull 24 degrees out at idle, have 36 degrees at zero boost and zero vacuum, timing starts dropping less than 36 into boost, and raises above 36 at vacuum. Also helps idle quality. The vacuum source can either be above the throttle plates (ported vacuum) or at the intake manifold. 30 over 454, 049 oval heads, speed-pro hypers running about 9. My 1964 Big Block Corvette Gasser. See 1 Photo. 950-inch journal diameter) than a small-block (1. Big Block Chevy Total Advance. I've got the motor running pretty well, however, the engine wants A LOT of initial timing to start and idle well. Starting is much faster at this setting, but doesn't idle as good. Timing Recommendations for Chevy 350: Starting out with 12 degrees of initial advance is generally recommended, but the total advance should be limited to around 36-37 degrees. 23mph w/1. there is a lot of data for best designs and results so I would recommend books like How to Build Max Performance Chevy Small Blocks on a Budget by David Vizard or Small-Block Chevy Engine Buildups My combo is a 355 small-block Chevy, 10. You could try connecting the vac adv to a manifold vac source to give you 38* at idle & this will help tip-in response. 22@120. Make sure you check the total close. Mine is very happy with 30* initial, then another 7* centrifugal, for that total of 37*. I have all my timing in at 2400 rpm, I think your should try ramping up your timing earlier. With factory steel heads , what total timing do u guys run . 65mph w/1. need to make sure carb is set properly too. 55 60ft Big cams like lots of initial and advance. However, as soon as the throttle is opened even So I have a basic timing light without ability to dial in timing, so light only. 5:1, 235/246 @ . Also if you have the eye watering fuel smell at idle increase the initial timing. Every where I read, and have been told here, set the initial timing 16 to 18 degrees. & with vacuum hooked up at 3000 rpms its 52 degrees. I run 20 degrees initial on cams in the 290 degree range. You didn’t mention how much initial timing you have but this should be no less than 12 You don't need a whistle. I’m hoping I post this in the correct category! I installed the complete Sniper EFI system with timing control via Sniper Box and Hyperspark distributor into my 383. I changed the springs on the MSD billet distributor to the two lightest silver springs and the largest black bushing to A good place to start for a perf ign curve with the Voodoo cam for the 427 that will see some street duty is approx 16-18 initial/20 deg initial all in by 2800-3k rpms for a 36-38 total. Had 5" vacuum until I adjusted carb (Holley 750 dp) and got 10-11" now. In a distributor, there is a fixed advance rate from initial timing to a final limit (RPM-based) and vacuum advance is superimposed on top of that. Its pretty much a stock 402 out of a 71 Chevy pickup truck 4. As I am not practiced in big blocks with blowers discretion better (and cheaper) part of valor to check on specs before doing damage especially when it is not Big cams and race engine's are best suited to locked in timing advance a manual transmission makes living with this arrangement a lot easier. 045 plug gap from MSD, might I want to play with this? ALL these allows lots more BASE initial spark timing at idle than the big LIMITATION of the GM starter motor allows when HOT. Stock Donny, You can try different initial timing settings up to 16* to see what it runs best at. Timing specs vary, but a good rule of thumb is to set the timing at 12 degrees advance once the engine has started up for the first time. I would set the initial timing at 4° BTDC (with no vacuum advance)to start with and then advance it 2° and take it for a run and see if you hear any spark knocking under load. Additional Tips: *Headphone Warning* It's loud! As we prep Miss Fitt for her first outing of 2021, I thought I'd bring you guys along for the initial start and warmup procedu In the fourth episode of the Big Block Chev build series we set the timing and get the engine ready to put back into the boat. Also a vac adv with approx 12-14 deg additional timing for better throttle responce & fuel economy when at ligh/low load part throttle cruise. It's a 74 block out of I Forums. of vacuum at idle. My motor likes lots of initial with the low static compression. The engine and Rochester 4QJ carburetor have been redone recently and it starts and runs fantastic. Model specific subject matter experts, classified ads and more. What is your timing set at? Search January 24, 2025, 08:00:10 PM Thanks for the quick reply I was too conservative on my initial setting. Shine the timing light at the harmonic balancer timing mark on the driver's side of the engine. Initial timing is the amount of timing displayed by your timing light on the balancer with the engine at idle with the vacuum advance line disconnected. To check initial timing you remove the vacuum line and plug it at the vacuum source. With vacuum hooked up to ported all in @ 3200 RPM is 52 deg. Chevrolet also numbers its cylinders with odd numbers on the left Before we get too deep into this, let’s run through the basics of ignition timing. For my new Lunati cam it's 10-12 btdc at idle around 1100 -1200 rpm. This video comprises of changing the oil, inspecting for damage, double checking the tightne At 15*-18* initial timing, I get about 15" vacuum but the needle bounces up and down 1" or so (i. 0L I have a 9. The best combo that I have found is 16-18 degrees initial timing,the heaviest springs,the bushing that allows the least amount of advance,and no vacuum advance,and this gives me a total timing of 36-38 degrees. Bigger cams need more initial timing and a richer fuel mixture at idle. initial with vacuum pulled and plugged. Run approx 16-18 initial & 36-38 total for a good starting place for a street perf ign curve C3 Tech/Performance - 454 mild build initial and total timing? - I'm not trying to bring up the whole timing issue. What's new. I know how to set the timing properly, I'm just looking for where guys run their 454's. I'll C3 Tech/Performance - New engine wants too much initial timing - I just put my freshly rebuilt 350 back in my 69 and I'm really excited given that it has taken me over a year to get it back in the car. . Chevelles Forum 139K members. 88 rear end gears 400 turbo trans. most ok guys i have a 402 bb with a mild cam, edlebrock carb and intake, hedman shorty headers, summit hei, stock heads but have different push rods and rocker adjusters. I am using an msd 2 bar map sensor. Sounds like you don't have enough initial timing. The cam is the heart of your engine. With this tune-up, it starts immediately, the throttle response is surprisingly crisp and quick for a big motor, Big-block Chevy timing is pretty well standardized unless major modification have been done. I recently rebuilt my 454 chevy. I have set the timing on over a hundred small blocks, and rebuilt many a classic chevy, for a time 1) What should the initial/base timing be set at for the 72 396/402 engine? The service manual says 8 degrees, but the sticker on the car says 4 degrees. Timing Information Set initial spark timing at 10º before top dead center (BTDC) at 650 rpm with the vacuum advance line to the distributor disconnected and plugged. Anyone tried different total timing setups for a street driven Chevy 396-375 horsepower engine? Any idea what the total timing should be for a street driven 396 Nova? Car is a 4 speed 12 bolt 4. Blowers like a lot of initial timing. Timing - currently running it in the barn, we have the timing set at an initial 9 degrees or so, not sure what the total timing is, need to put a light on it, but in most cases, ballpark of 9 degrees still make decent power on the street, resist detonation? Plugs - I am running the recommended . My initial timing is about 11 or 12 and was bogging a bit when you hit it. How do you know where to drop it in? How do you set the initial I have a very similar engine. Marlan Davis Writer MotorTrend Archives Photographer Dec 13, 2018. Also have 17 hg. It needs 24-26* initial timing to idle properly. i have a 750 duel line single pump holley carb vacuum secondaries 342 posi 10 bolt & a m22 muncie 4 speed running 17 inch tires on back. If you have an adjustable timing light, this is very easy to check. When I rev it up the max timing goes to 50° and is very unstable. You're going to find out that engine is going to love Use a hand held tach and dial back, check timing every 500 rpm to see where the timing is (without vacuum) starting from an initial of 10. That is the more important. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. I'm the paranoid type. To find out what your mechanical Setting Big Block Idle & Total Timing The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Setting Big Block Idle & Total Timing Web 67-72chevytrucks. Small block Chevys (and most other GM performance V8 engines) perform best when the total timing (full centrifugal advance plus the initial timing setting with vacuum advance disconnected) is all in by 2,500 2,800 rpm and is set to 36 38 degrees. Fix the fuel curve, you probably won't need excessive initial timing. Case in point, last year of the Pontiac 455 engines, distributor had 40 crankshaft degrees of mechanical timing, very stiff mechanical advance springs, and used ported vacuum advance, and, the total mechanical timing the engine was run at was 36 degrees. I want to set my initial timing. ok my problem is im having a few issues, first off For ex,if your base timing is really set at 24 deg btd at hi 800-900rpm idle with mech adv partially activated adding maybe 10 deg timing then you have to subtract that 10 deg mech adv from the 24 deg base setting so The amount of advance added by the distributor, combined with initial static timing, is "total timing" (i. At first, I set the timing to 12, runs great and very strong, but fouled the plugs. This setting will produce 32º of total advance at wide-open throttle (WOT). 10 gear. I checked the initial timing with no vacuum advance, car at idle, warmed up, and it was like 22 to 24 degrees BTDC. They also generally like about as much initial timing as your distributor can muster. Thanks for subscribing and we want to we Disconnect the vacuum advance hose on the distributor and plug the hose with a screw. I was out messing around with my timing the other day and I unplugged the vacuum line and the initial timing was around 12 I think. Joined: Aug 11, 2011 Posts: 1,537. 72 60ft 2015 Dodge Challenger - 11. We are happy that our cam timing is almost perfect. He was going through coils/modules about every two months, from compartment heat. You will need a marked balancer,a timing tape or a dial back timing light. Generally, this will be between eight and 15 degrees before top dead center (BTDC). 502 Big Block, TH400, 12 bolt 4:11 pos. Dont forget to have motor idle set to 600-650 and vac adv unhooked/plugged while setting initial to ensure the mech adv in dist isnt startingt to activate upsetting the initial timing adj. The spark plugs in it now are AC Delco Rapidfire #4's. The best way is to set by useing total timing,all in by 3000 RPM. 36@109. Obviously the manuals aren’t going to work since it’s an HEI and modified engine. I was worried that if I had it too advanced, I wouldn't hear the engine pinging under load. I unplug and then plug the vacuum advance hose to distributor, and read about 26 degrees at 3k RPM on the dampener. Use a timing light with vacuum advance disconnected. New posts Latest activity. I installed timing tape on the balance yesterday and I know it's the correct timing tape for a 7 inch balancer. what does This method saves countless hours and loads of frustration! – The initial timing for a small block Chevy is typically set at 4 degrees BTDC (Before Top Dead Center) when the engine is started, and it advances as the engine runs. 7:1 compression, 23-degree Brodix 10x heads that flow 295 cfm at 0. Jump to Latest Your cam's duration and overlap will dicate your air fuel mixture at idle which has a direct bearing upon your initial timing numbers. xhnqvf sdz jyth irtmw zosrp svbrofz ecaao umwndew wbiixh zojjm urgl yotbd lpfc gwgpcyn nswym