Author Topic: New 331 for my car but I need some help. (Read 1100 times)

Starfury · « **Reply #25 on:** November, 15, 2009, 08:34:08 PM »

Err, had to review the thread again. Yeah, you're definitely going to need to have valve reliefs machined for the twisted wedge heads. Should turn out freaking awesome, though:) I hear Jay is the man.

buening · « **Reply #26 on:** November, 16, 2009, 02:10:41 PM »

This is a totally different beast, but a comparison of 185 to 218cc heads (clevor CHI heads) can be found here towards the bottom: http://www.chiheads.com.au/our_results.php

Not really comparing apples to apples, but proves the point that bigger isn't always better when you look at heads. It may give you 10 or 20 extra HP, but it'll push your curve higher in the RPM range as can be seen in their numbers of the comparison. At 5300rpm they are identical and after that the larger heads start picking up steam. Again, a clevor is a different beast than a boosted 331 but you get the idea. Good luck with the as cast TWF, I hear they are a darn good head.

68EFIvert · « **Reply #27 on:** November, 16, 2009, 05:09:34 PM »

I've heard great things about the FAC heads as well. I am putting the full faith in this build in Jay Allen's hands. The only thing I am not doing is making it a 363 stroker. Jay wanted me to go bigger than I want to with a Boss block. I am even going to follow his guidance on roller lifters. I have learned not to second guess professionals (well most of the time) and I am tired of doing things twice.