Originally Posted by GTBMad

Some more data on the ALLPRO Hurricane heads

These were ported by Nathan Higgins from Higgins Race Developments

Flowed on a SUPERFLOW1020 intake 358cfm exhuast 265cfm

Valve in 2.080 exh 1.62

Originally Posted by GTBMad

Why I think it didnt work was we were using arp standard stud size at the time, and there wasnt enough deck thickness on the lq9 heads and with the boost we were trying to run.
I beleive the heads were moving around so we still pushed water combined with the flex from the block, it was at that time we were cracking the blocks through the mains.