243's vs 853's

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Apr 8, 2012 | 09:26 PM

njmaster

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243's vs 853's

I currently have the stock 853's on my car, but i purchased a set of 243's off of an LS2. I will be doing a cam swap, so i went ahead and had the heads ported. They picked up 30cfm at .500 lift over stock 243's. I am curious as to how much hp these heads are worth over the stock 853's?

Apr 8, 2012 | 11:10 PM

studderin

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30-40 without milling them a bunch, with a normal intake.

Apr 9, 2012 | 07:58 AM

MonmouthCtyLS7

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Stock you'll see about 15 hp over your Fbody heads w/ the 243's...obviously more with port work

Apr 9, 2012 | 08:17 AM

njmaster

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Thanks guys. These will be installed with an F11 cam and I already have an LS6 intake and LT's. I got the 243's complete with springs and rockers. I will obviously be running an aftermarket spring with the cam, but what about the rocker arms? Are they any different than the stock rockers that came on the LS1? Like i said the 243's came off of an LS2. Which ones should i use?

Apr 9, 2012 | 08:22 AM

MonmouthCtyLS7

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Quote:

Originally Posted by njmaster

Your stock rockers are fine.

Apr 9, 2012 | 08:35 AM

autogeek23

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yeah keep the stock rockers. if anything you could do the trunion upgrade come from comp. $134 from Jegs.

trunion: http://www.jegs.com/i/Comp+Cams/249/13702-KIT/10002/-1

heres a write up on how to do it http://www.f-bodyhideout.com/forums/...grade-Write-up

there is a tool but i cant find it

Last edited by autogeek23; Apr 9, 2012 at 08:36 AM. Reason: wrong link the first time