kresseguie

How much more hp can you get when you switch out ls1 heads for ls7 heads?

96capricemgr

iTrader: (1)

It only works on 4.8ls swapped into Miatas, then you have to use the stock truck exhaust manifold and no bigger than 2" exhaust.

DavidBoren

On what shortblock?

Ls7 heads need more bore than the ls1 has.

KW Baraka

iTrader: (7)

About 150 HP to the wheels......give or take.

Give it a shot and get back with us, on that....

KW

gnx7

iTrader: (28)

I think it's more like 150 per side

KW Baraka

iTrader: (7)

Sorry.....my bad

KW

Quick Ranger

iTrader: (2)

KW, you were right, it's 150hp. You get to 150 hp per side when you use the small bore to large bore adapter plates. LOL

DavidBoren

The warranty on those adapter plates are only valid if you have those little fans in the cold air intake tube and a fart-can hon-duh exhaust.

96capricemgr

iTrader: (1)

What if you notched the valves to clear the bore?

DavidBoren

Honestly, this is a joke. They don't fit. And for the price of ls7 heads, you can get aftermarket heads that actually fit the application. Ls7 heads can barely be made to fit the ls3 bore, and even that requires a smaller exhaust valve most of the time.

Can we please just let this abomination of a thread sink to the bottom and die?