Had a Question about changing the heads on my 98 Z28 camaro

**Fbody4Life01** · 08-18-2011, 12:29 PM

This is my first post im new to the site but i have a question

I have a set of aluminum 241 casting ls1 gen III gm small block cylinder heads that i got givin to me by a friend in a trade. I was wondering if they would be worth the power gain to put them on. and roughly what would it be?

They have a 4 angle race valve job, valves have a 32 degree backcut on them, valve job has been hand blended and bowls/venturis have been opened up, the valves are freshly reground on the faces and tips and valve stems have been micropolished, they have also been milled .060" which removed about 9cc of combustion chamber volume which puts them around 58cc combustion chambers... This is the max you can mill without messing up intake manifold fitiment so if you bolted these on an otherwise stock ls1 engine the intake manifold and everything will still fit perfectly. The heads are about 30cfm better than stock so they're as good as a stock 243 casting ls6 head... They are also assembled with yellow ls6 valve springs.

**Fbody4Life01** · 08-18-2011, 12:30 PM

any help or advice would be great thanks

**WICKEDLS1** · 08-18-2011, 01:49 PM

If those are the heads off craigslist then talk to boyds machine shop and make sure that all of that was done

**Fbody4Life01** · 08-18-2011, 03:18 PM

yeah i wanna buy them bitchs there cheap

**WICKEDLS1** · 08-18-2011, 03:37 PM

save your money and do what i did and just buy 243's and have them ported and polished for like 300 bucks at moore machine shop

**Potz_Speed** · 08-18-2011, 05:25 PM

actually the 241's are an excellent bang for the buck. the mold manufacturing process with the 241's changed and there is really not several hundred dollars worth of difference between the 2. especially once the machine shop improvements are done.

**2002ssslp** · 08-28-2011, 04:41 AM

Put'em on and have fun. You already have them so why use them as a paperweight. You will need to have the PCM reprogrammed, see Frost for that. And you can only use 93 or higher octane fuel because you are going to raise the CR. Make sure your knock sensors are working properly and LTH may not be a bad idea as well. Good luck, let us know how it works out.