dthompson67

i got a pair of 289 hipo heads and i was wondering should i put those on my car since it has smaller combustion chambers so it will make more compression?

fordstroker

you can, but keep in mind a full 1 point of compression is worth at best 2-3%, so if you had a 300hp engine at 9:1 CR and raised it to 10:1 CR you would see a gain of approximately 10hp give or take a few.

rmodel65

dont do it sell them to a vintage guy for a resto the e7 flow more than the vintage heads sell them and a get a set of gt40 or somethaing

on a side not the only difference between the hipo 289 heads and the regular one are hipos got screw in rocer studs,machined valve spring seats and close tolerance pushrods slots in a nutshell but they flow identical ot a regular 289 head they were just setup to turn a high rpm to go along with the hipos solid cam