I have a SBC 350 bored .30 over. It is a gen 1 block, 4 bolt main, 1 piece rear main seal. I have a scat rotating assembly in it (SCA-1-41705BIE) Comes with Flexplate. I have had the motor dynoed and its at 490hp to flexplate. I need to find a flywheel. Anyone have any idea what i can use. THanks

You need a 153 tooth flywheel for a 1-pc rear main seal

Does the engine already have a starter on it? It'll need to match the starter.

I thought you could get the 168 tooth version in a 1pc RMS too?


You looking at a stock replacement, or some kind of high end aftermarket one, like aluminum or whatnot?

I need a high performance i guess its a street/strip motor 383 stroker. 490 horse power. to dyno they dyno company had a starter they used cause i am looking to run a mini starter

k, then just make sure your block can support the 153 tooth (straight pattern) bolt style starter. Grab a starter, and a 153 tooth aluminum flywheel, and you should be good to go.

http://www.summitracing.com/parts/HAY-10-530/
http://www.summitracing.com/parts/ZZZ-60-3202/

Whatever you like. oh, 383 you said? Make sure the flywheel weight matches the engine build style. ie. they both should be "internal balance" I believe.

D'oh! Mixed myself up! You don't need to worry about internal or external balance, it's a 1 pc RMS, that's all you need to know. Either one of the two I linked would work fine. Notice the weights, that's all rotating mass, so the extra $$ you spend to get the light aluminum one will be noticed when you rev your engine...

thank you my rotating assembly is internal.

why doesnt it matter that the flywheel says external and mine is internal?

Absolutely it matters, but it depends on your engine builder's and the manufacturer's definitions of "external".

This is going to get sticky now...

350 and smaller (pre 1987, 2 pc RMS) = INTERNAL balance
400 cid (pre 1987, 2 pc RMS) = EXTERNAL balance

383 (pre 1987, 2 pc RMS) = As per the engine builder. Typically, you'd hope, INTERNAL.


1 pc RMS, regardless of size, it 1pc RMS. You need a flywheel for a 1pc RMS engine, end of story. As Apeiron says, it's down to semantics now. It's just a 1pc RMS, *visually* there is a weight on the flywheel (batwing as they call it), so you'd think it's EXTERNAL, since it's outside the engine. But it's NOT THE SAME as an EXTERNALLY balanced engine, such as a 1977 400 cid engine.

I said to use a 153 tooth (stock size) because a 168 tooth flywheel won't fit inside your bellhousing, unless you have a lakewood blowproof unit

A 153 tooth flywheel would match your stock starter if you had one already