wavrdr

iTrader: (1)

Hey guys, I was kicking around the idea of picking up a 402 stroker and putting my topend on the engine and dropping it into my ZO6.

Topend includes:
Vengeance ported Fast/LS2 tb
ETP 215's at 59cc

Would this combo complement the engine or would it choke it off to much? How would my head cc's effect the final SCR/DCR as I "believe" the LS2's have more compression due to the pistons coming further out of the hole?

All replies are greatly appreciated!

Alan

2c5s

iTrader: (11)

Depends on what cam you want to run. As is with a flat top pistons, your SCR is going to be around 11.8. Again, dynamic will mostly be dicatated by cam. If you're going to run a typical 402/408 size cam, I think the heads will hold you back a bit. Here's a thought, dump the E.T.'s and FAST, do a l92/l76 combo, take the 2k you save and apply it your shortblock and make the same power if not more and have $$$ left over.

DONAIMIAN

iTrader: (18)

You would need an 8cc dish piston to get it down to 11.6 SCR,the rest would depend on the cam. If you have thae chance to do it, I would go for it becuase you can always change the heads out later.

Cary@Perf-Induction

iTrader: (1)

the 215's will work very well with the rest of your setup. they are not too samll for your combo.

beardWS6

iTrader: (1)

Do it! What cam you thinking of?

pianoprodigy

iTrader: (1)

???

SCR of 11.8 on a 402 with 59cc heads and flat top pistons? Maybe if you had a .090 gasket.

You'd need a piston in the -8cc range to get the SCR (and thus the DCR) manageable.

2c5s

iTrader: (11)

My bad, 12.9..... as is. Sorry about that.

bigdsz

iTrader: (1)

With 63cc heads and OEM headgaskets I'm going with a -10cc piston on the 408 Eric is building for me. I end up with a SCR of a little over 11/1.

wavrdr

iTrader: (1)

Thanks for the thoughts you guys....

I seem to have a little ring land issue on my LS6 on piston #7, thus the thinking of a bigger cube engine. I'm thinking of a 402 with my current topend and a big cam, or 414 with the L92/L76 combo, or the LS7 bottom end with the L92/L76 combo.....

Regardless of engine I will be going with a big cam, but just wanted some opinion on the 402 with my current heads....

Thanks again!

Gregory

iTrader: (4)

Go with a big duration cam.
Small valves and ports on the heads will limit your power.
I have Patriot Performance Stage II 2.055/1.59/59cc heads on a 402 with 14cc dish pistons and a .045 gasket. My compression ratio is 11.17:1.

I purchased the heads and cam for a LS1 and went with them on the 402 just to save money. In the near term I will upgrade to L92 heads and a 240+ duration 600+ lift cam.

pkincy

iTrader: (1)

When I did my 402, I had a good set of 5.3 heads. Ultimately I opted to sell those heads and the cam and do a set of heads that were optimized for the 4 inch bore and had more flow than the 346 needed. So I also decided to go with bigger chambers and flat top pistons.

Worked for me.

Perry

JZ'sTA

iTrader: (23)

I would defentially try this setup.
many of the guys on here will tell you..... the heads will hold you back, or you should go with a L92/L76 setup or something like that.
Now while I won't disagree that there are potentially better combo's I will say that the 215's with the fast ported 90 have plenty of airflow to make gobes of power.
Design the cam around the parts you have and you could have a killer combo. No need for a huge duration camshaft. In fact check out this thread.
https://ls1tech.com/forums/generation-iii-internal-engine/649674-line-some-recent-threads-discussing-smaller-cams-milder-combinations.html
Very similar to the top end parts you have. I could see a slightly larger cam maybe a 236/240 or something just a bit larger giving you 600 flywheel HP.
From what Tony show's in this thread and prooves is that the 205/215 size heads are plenty to make awsome power all over the dyno graph.