I'm building a B20 and managed to come up with an E head out of a '72 140. At first I was excited about the E head since it seems to have a reputation for the best flow in stock form. Now I am wondering if the compression ratio will be too high.
If I deck the block to get 0.035" squish, my compression ratio would be about 10.8 or 10.9:1 (assuming 45cc combustion chambers on the E head).
I also have a late model F head ('74 I believe). Should I use this head and shave it down to get a little lower compression ratio? As I understand 10:1 or slightly below is a good target (any suggestions here?)
I plan to use the Isky VV71 cam with SU carburetors, dual downpipe exhaust manifold, and 2" exhaust.
Head work will be a three angle valve job and some mild DIY porting in the exhaust.
I live at 7,000 feet elevation, so 91 octane is the highest I can get around here. I don't mind buying premium gas.