Side By Side Cylinder Head Comparisons/ RallyBob's Performance Suggestions

[kwilford]

Originally Posted by Gordy Referring back to the "year" stamped in the head, I have a head stamped "70" and yet it has a 4 journal cam shaft (only 10 head bolts). Shouldn't the 70 only have a 3 bearing cam? I don't want to start any porting or shrouding if this is a later model hardened head!

Remember, the "1971" model year was started to be built in August 1970. So the heads were cast even earlier in 1970. My "October 1970 build date" 1971 GT had a four-bearing head, and low compression pistons