New heads

[WILMASBOYL78]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ban617</div><div class="ubbcode-body">Since they are semi open won't the compression ratio be lower ? </div></div>

The #290 head was a closed chamber head that the factory added a little 'breathing room' to. It was used on the 396/350hp and 454/360hp big block applications in 1970. It was identical to the #063 used in 1969 except for the newer 'peanut spark plugs'.In both cases the advertised chamber volume [101cc] is the same in these heads and even #215 which came before that. These heads were all designed to work with a small dome piston that produced a 10.25 to 1 compression ratio.

As was mentioned, they are a great platform for a street build...with a little work these oval ports, combined with other properly selected pieces can really make good power.

-wilma