c5_ls1_6spd

iTrader: (-1)

will ETP LS7 small bore heads fit on a stock 346 LS1 motor?

Beast96Z

iTrader: (21)

No reason why they shouldn't. I do believe that's why they were made. For the 4.060" and smaller guys.

DavidNJ

Yes, but a 3.90"?

Cary@Perf-Induction

iTrader: (1)

yes they will fit.they will work a little better on a 4.00 bore

c5_ls1_6spd

iTrader: (-1)

will they outperform ETP 215s and 225s if they're on a stock 346ci C5?

how much does the ETP LS7 small bore heads flow?

madmaxz

iTrader: (7)

you better have an all out race motor with a huge cam to run the ls7's on a 346. 255cc intake chambers on the ls7's.... WAY to big for a 346 imo. now if its a 7500rpm race motor go for it. 215's are the way to go for a 450+ rwhp stock 346.

Beast96Z

iTrader: (21)

People have been running the 4.125" AFR 225's on 346's for a long time now. No reason whay you couldn't do the same with these.

Not sure if the small bore ET LS7's have the same port volume as the larger counterparts, but I do agree that a 215 or 225 may be a better head for a stock motor. If the port is substaintally smaller on the small bore LS7's, then I'd probablly go that route because of the better intake.

DavidNJ

Cary said they fit. Whether they fit is a matter of valve location, diameter, and angle(s).

You really can't compare port sizes of different heads. One is a 15°, the other an 11°. LS7s were designed for big engines, so they are likely to be too large for a smaller engine in the same rev range. The small bore version does have a smaller valve size. However, you are correct, they are probably better suited to a 402/408/418/422.

Cary@Perf-Induction

iTrader: (1)

they are 245 cc. actually not too big, I cant say exactly wha they will do yet. so I will bite my tongue for the smaller engines til' i dyno one real soon. They have run very successfully so far on 6.0 litre's and 402's

SVT THIS

iTrader: (27)

I'd like to see how these work on some stock cubes too. I'll be running a TRex cam and most likely a 90/90 setup eventually. I'll be running cam only all summer but I was hoping to get some ET 215s this winter. Anybody know if these LS7 heads would work better with my setup?

Sorry, not trying to hijack the thread just get some good info, thanks

c5_ls1_6spd

iTrader: (-1)

what do they flow at .600 lift?

Cary@Perf-Induction

iTrader: (1)

363 cfm

JZ'sTA

iTrader: (23)

I personially dont think that 95% os the H/C cars will benifit using the LS7 heads over the 215 or 225cc ETP heads.
IMO a very large cam will be needed, and a mostly race setup.
In most peoples setup the 225's will be plenty with stock cubes.

Could however be a good setup with someone running a 4400+ stall, T rex+ cam, or maybe even a solid roller setup.