383 stroker

[72chevy327]

Im building one with a 400 crank, and was wondering if i could use 5.7 rods and 383 pistons, or do i hafto change my rods to 6.0 and use 350 pistons. by my thinking the 400 crank has the same stroke as a stroker crank so it wouldent matter witch way you did it. but iv never built a 383 so. thanks.

[b&a72]

No that set up is fine. I use the same one 400 crank, 5.7 rods, and flat top 383 pistons and she runs like a champ.

[RACINJASON22]

as long as your 383 pistons were ordered for 3.75 stroke 5.7 rods you got it.

[72chevy327]

Thanks alot thats a BIG help.

[hp1967c10]

I have a 388 (.060 over rather than .030) and I experienced an issue with the pistone skirts hitting the throws on the crank. This is easily corrected by removing just enough of the skirt to clear. Needless to say, balance rotating assembly after clearances are achieved.

[72chevy327]

whats the hightest CR i can go and still use reg gas.its 9.6 or 10.8 what should i go with.

[Stroker]

Originally Posted by 72chevy327

Im building one with a 400 crank, and was wondering if i could use 5.7 rods and 383 pistons, or do i hafto change my rods to 6.0 and use 350 pistons. by my thinking the 400 crank has the same stroke as a stroker crank so it wouldent matter witch way you did it. but iv never built a 383 so. thanks.

72chevy, Are you planning to use a production 400 crank? If so the mains will need to be turned. You may find the machine work cost to prep the crank are as much if not more than the cost to purchase a stroker crank.

I noticed the 327 in your user name, are you planning to use a 327 block for the stroker motor? If so it's important to know if you're starting with a large or small journel block.

The piston rod combination has already been answered but you can have clearance issue between the rod bolts and camshaft. Most machine shops know what needs to be done and can clearance the rods when they resize and static balance the rods.

You might look into some of the stroker kits. When I built my motor my thinking was I would rework and reuse the stock rods to save a little money since I felt they would support the power levels I was aiming for. When all the machine work was completed (magged, resized, new rod bolts, balanced and clearanced) I could have had much better rods in the engine for about another $75-$100. And probably saved some money if I would have bought a kit including crank, rods, pistons, bearings and rings.

Compression Ratio and fuel tolerance. There are a lot of things that factor into this question. Two major items combustion chamber shape and material, and camshaft specs. Gearing, weight, qwench, altitude, air temps and water temps can also be important in determining the max compression with a given fuel. Do you know what heads your going to use? Cam? Do you use your truck to tow?

[RetroSBK]

I run 9.8 CR with Alum heads and do so on 87 octane all day long... 383 with Scat forged crank and rods, no problems


Well except that the new engine promptly smoked the stock 700R4... Hello , TCI, Super Street Fighter please...

Will

[72chevy327]

thanks for all the info Stroker. Im starting with a 350 4bolt main and the crank i have has been turned down to std mains and .010 throws. my 327 is no more it seems you cant trust the machine shop to put heads together for a 450hp roller 327. i got a full refund and all the not f'ed parts back.