nope but iv always wanted to try putting one on cause it shure feels like somethings not right. So kyle if i put the 20r head on the 81 block the compression wont change any? I was hopeing it would come up a little bit. Now you got me thinking if i should just stay with the 22r head since it does have biger valves and i am after more low to mid range power.
nope, 20R on 81-84 22 is a jump from 8.5 to 1 compression ratio to 9.5 compression, regular gas is fine for under 10.1 with the proper cam, the higher the compression ie over 10:1 you need more duration so as to overlap the valves at low rpm's
the compression on that 91 block and 20 head has got to be close to 12:1
get 89 octane and dump some octane booster in each tank, cheaper that way
oh and Kyle, my run to see the Mammoths was my first trip and the engines "break in run" and i got 19.5 miles per gallon
so the hybrid can get good mileage also
