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Old 12-13-2011, 04:27 PM
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Please help. will this work

Hello guys I am in the process of building a 383 stroker and am in need of some advice. I need to know if this setup will run on pump gas.

350 4 bolt main bore 30 over GM stock 62cc heads port and polished scat 3.750 stroke nodular iron crankshaft Keith Black flat top pistons Perfect Circle moly rings Clevite 77 rod and main bearings Melling HV oil pump Melling 350HP-327 cam (dur 222 at .050 / valve lift .447) Clevite hydraulic lifters SA Gear 2 row 3-key true roller timing set Heavy duty valve springs Melling chrome moly retainers Pioneer HD valve keepers

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Old 12-13-2011, 05:00 PM
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NO.
You have about 10.8:1 compression ratio. That wouldn't work with your cam. I would not run a street engine on pump gas with more that 9.5:1 with a good iron head and 10.5:1 with a good aluminum head and a cam of less than about 230@.050".
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Old 12-13-2011, 05:20 PM
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A 20cc Dish Piston & 0 Deck Ht. = 9.68Cr
22cc = 9.49Cr
May want to find some 76cc Heads, for 9.58Cr. w/7cc 4VR Piston.
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Old 12-13-2011, 05:39 PM
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What about this cam. Xe268h cam. Duration is 224/230 at.050 and 477/480 lift and 110 lop I'm not looking for a race car I'm looking for it to have some spunk when I do take it to run the track. Maybe 12 or low 13 even mid 13 in the 1/2. And run on regular pump fuel
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Old 12-13-2011, 05:55 PM
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No. You will have a problem if you use those pistons with your heads. If you must try, you need a cam with at least 234@.050" on the intake, at least that much on the exhaust and a LCA of at least 110. Even that will be a tuning nightmare on pump gas.
The best thing you can do is what SSedan64 said. You will be a LOT happier!!!!!!!
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Old 12-13-2011, 06:04 PM
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X2 ^^^, you're high on compression for pump gas.
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Old 12-13-2011, 06:06 PM
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Thanks guys damn I'm so confused . Ugh ill let u guys know ahead of time on what I do. Thanks been alot of help
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Old 12-15-2011, 12:26 PM
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Engine combo

I have almost this same combo in a 50 Studebaker truck. .030 350 chevrolet with 186 casting heads, 67cc chambers that were milled just to ensure they are flat surface, so the chanber size is about 64 cc, Flat top pistons with the 327 /350 HP cam , 447 lift /300 adv duration. Weiand stealth dual plane intake and holley 750 3310 carb, hei ignition, short "block hugger" headers. This engine has run great for over 15 years on pump gas. This cam's long duration and cam overlap bleeds compression at low RPM and I have no detonation issues even using regular fuel. Low RPM torque is actually very good and mid range 2500-5500 is impressive. I believe the compression ratio calculations were static and did not take into account dynamic compression when the engine is actually running. This combination has also been very reliable with no issues. OOps, Re-read the original post and he is building a 383, I have a 355. His compression will be significantly higher.

Last edited by Studebaker; 12-15-2011 at 12:38 PM. Reason: correction
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Old 12-15-2011, 01:27 PM
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Quote:
Originally Posted by k3vin364
Hello guys I am in the process of building a 383 stroker and am in need of some advice. I need to know if this setup will run on pump gas.

350 4 bolt main bore 30 over GM stock 62cc heads port and polished scat 3.750 stroke nodular iron crankshaft Keith Black flat top pistons Perfect Circle moly rings Clevite 77 rod and main bearings Melling HV oil pump Melling 350HP-327 cam (dur 222 at .050 / valve lift .447) Clevite hydraulic lifters SA Gear 2 row 3-key true roller timing set Heavy duty valve springs Melling chrome moly retainers Pioneer HD valve keepers
I was going to outline a build for you, but there is no need to waste my time if you're going to use those Fosdick production heads. And please don't say "ported and polished". It's from a way long time ago and makes you sound stupid. They still port heads, but only polish the exhaust runners. The intake ports are left rough (like a fingernail file) to help keep the fuel in suspension.

If you want to free up some loot for heads, I can help you with parts choices to make the motor do anything you want it to. Actually, you could use bone-stock L31 heads with a short lift cam (0.400") and make a ton of power. If you want to shop around for some 906 or 062 heads, I'll help you plan a build that will work. 64cc heads with an 18cc piston (KB135) will make 9.7:1 static compression ratio. Use a cam with an intake closing point of ~40 degrees ABDC and the DCR will be 8.33:1. Build the motor with a tight squish of 0.035"-0.045" and it'll be rattle-free on pump gas.

Check around and see if you can come up with a set of used L31 heads. I would think you could score them complete for under $200, but of course I have not bought any lately, so have no idea. Get the rail rockers and valve covers with them. They're thin-wall castings, so make a deal with the seller that you can return them for your money back if they fail magnaflux.

Last edited by techinspector1; 12-15-2011 at 01:42 PM.
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Old 12-15-2011, 06:37 PM
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And replace that Melling HV pump with a Melling SELECT STANDARD VOLUME, I think the number is a 10355. You can Google it or search on this foum, a million threads on oil pumps, and oil control. Add a Milodon Windage tray, could be worth as much as 30 HP
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