My car Is a cam only car with 853 heads on the car. It has bolt ons a 230/236 cam and a F.A.S.T 90/90 setup on it. The car makes 415 hp with the 853 heads on the car and i just came across some 241 heads ans i was wondering how much the car will pick up from swapping the heads. I was also wondering how much i would pick up if I had the heads ported and polished over a stock 241 head.

Thanks in advance guys..

 

i'd guess 15-20 rwhp using pp 241s.

just step up to some 243s, i bet you'd get at least that much of a gain without porting/polishing.

 

what do the 243 castings come on I have 853 with 384 hp looking at adding a intake and heads

 

02+ z06's, 05+ gto's

 

243=some ls6's.....241's newer model ls1's

 

yeah but I have a set of 241 heads that I came across for nothing already so I was just curious to see how much i would gain with them over the 853's

 

853 to 241's aren't going to be a huge improvement from what I have heard. They are slightly revised but nothing like the 243's (LS6 head). I HAVE heard that you can port the 241's nicely and they'll perform well...so maybe its worth looking into Texas Speed porting ($650 a pair). Otherwise, dont' go thru all the effort swapping heads from 853 to 241....go straight to 243's.