shwine617

I have been working on my car all summer and I am finnaly ready to put my gm goodwrench 350 in. But I am stuck on what heads I should use.
I have 58cc 305 tpi heads that came off the 355 I had in the car. I hated the other motor because It only pulled to like 4500 rpm, now I am not sure if that was because of the heads or the basically stock tpi. I don't really want to put to much money into the heads. So I was thinking of maybe putting bigger valves into the 305 heads. I put a turbo 350 and a 3000 stall converter in it, so if the car only pulls to 4500rpm again its going to be worthless. I also picked up some slp runners and a 58 mm TPIS tb, So hopefully that will help a bit.
thanks for the help!

Stephen 87 IROC

Heads is where you'll make power. You can improve the induction and exhaust system but if you're still using restrictive factory heads, you're holding back a lot of potential power.

Consider what it's going to cost to have 2.02/1.60 valves installed plus all the extra machine work needed, porting etc, then compare the cost of some new aftermarket heads with all that work already done to them. You'll pay a little more but have a much better product for the money.

You wouldn't do a big cam and intake swap then still use a factory TBI/carb and expect huge gains.

Sitting Bull

You can make those 305 heads haul really well for not much money!

Follow the link at the end of my sig

90rocz

Are the 58cc heads, the Vette aluminum D-port TPI heads??At over 10.0:1, aluminum material is a MUST to keep cool.
If not, swap the out for some good 64cc heads.
By the time you pay for a quality 3-angle valve job + big valves + machining down valve guides + new seals etc.. You could get some good 64cc, large port, big valve heads with new seals and springs, locks & retainers etc.....