Originally Posted by jer_760
Because the one at the head does the most for heat transfer, the spacer between the runners/plenum really doesn't do anything but lengthen the runners. It's up to you, put all three on there if you want. My plenum spacer has been sitting in the box for two years for that reason, the other two are installed.
Because the one at the head does the most for heat transfer, the spacer between the runners/plenum really doesn't do anything but lengthen the runners. It's up to you, put all three on there if you want. My plenum spacer has been sitting in the box for two years for that reason, the other two are installed.
same here.
Also I don't think its a huge gain. Maybe 3-5whp at most. Dyno before and after and let us know