Nealio240z Posted January 11, 2008 Share Posted January 11, 2008 I picked up a set of ls1 heads with 30k miles on them- for free!!! I still dont have a block though... I plan on building a 500+ hp ls1, 240z. This is my 2nd v8z project. What should I do with these heads?- should I port, polish, plane the deck, add roller rockers, valve springs?????? And can I do any of that at home? I have heard of people porting and polishing at home but i dont know the process or if im gonna screw them up. (im very mechanicaly inclined) I still have to decide if i have to boost the car or not to get these hp numbers. I have no exp. with ls1 heads. How much hp are these heads capable of? Any suggestions would help. Thanks:burnout: Quote Link to comment Share on other sites More sharing options...
janaka Posted January 11, 2008 Share Posted January 11, 2008 what casting are they? I'd decide what cam you are planning to run, and also if you are going FI as those two things are the biggest factors in what is 'needed' to be done to the heads. From my recent reading on ls1tech.com (go there, LOTS of info) rockers aren't really utilized all that much other than stock. Rollers can reduce some valvetrain stress/wear but to each their own. 500rwhp can be done NA for sure with a nice cam/head/intake/LT combo. There are guys running small cams (224/224 .567I .567E or smaller) and putting down 400+ hp... 500 is 'almost' a walk in the park with a bigger cam and nice heads. Here is some light reading from one of the stickies on ls1tech.com Is there a benefit to running aftermarket roller rockers? http://www.ls1tech.com/forums/showthread.php?t=669911 http://www.ls1tech.com/forums/showthread.php?t=713034 Head cc volume = what compression ratio? http://www.ls1tech.com/forums/showthread.php?t=111207 The "recipe" to making 500 rwhp with just heads and cam http://www.ls1tech.com/forums/showthread.php?t=732392 Head flow comparison. http://www.ls1tech.com/forums/showthread.php?t=317323 http://www.ls1tech.com/forums/showthread.php?t=99248 Who are the best LSX head porters in the USA? http://www.ls1tech.com/forums/showthread.php?t=651243 Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted January 11, 2008 Author Share Posted January 11, 2008 THE CASTING NUMBER IS "241" Im planning on going with a FI set up... Quote Link to comment Share on other sites More sharing options...
LS1 240Z Posted January 12, 2008 Share Posted January 12, 2008 sell them for 150 or so and buy some good heads. you can buy 243 heads which are much much much better for less than $500 to your door Quote Link to comment Share on other sites More sharing options...
Nealio240z Posted January 17, 2008 Author Share Posted January 17, 2008 I put the heads in the shop today... He claims he can get them to flow 270+ cfm each. Hes been building race engines for 25 years. For $600 its worth the chance... Well see. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted January 17, 2008 Share Posted January 17, 2008 This place has an excellent reputation for porting LS heads. Beware of the first gen SBC head porter who turns his experience to LS heads. Mike Kelly was disappointed when he had his LS heads worked. Quote Link to comment Share on other sites More sharing options...
LS1 240Z Posted January 17, 2008 Share Posted January 17, 2008 ported LS1 heads flow as much as stock 243s. and even when you mill the heads they still dont have as small of a combustion chamber as the 243s. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted January 17, 2008 Share Posted January 17, 2008 The site I linked posts all their flow numbers. They have numbers for their LS6 packages also. Plus Trick flow, AFR, and eventually L92 heads. All I know is I have a dyno book where they took an LS2 motor (which have the LS6 heads), sent the heads to TEA and added a cam to get 572 HP. People on LS1tech.com talk highly of them too. Quote Link to comment Share on other sites More sharing options...
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