ProComp/Speedmaster aluminum heads
I’m not going to say, however it can be whatever you want, but no flycutting of the pistons is allowed.
I will say...... it’s probably less duration than you might think.
The 400 uses the same lift, but has heads with 2.11 intake valves.
It’s been 10.40’s@127+.
I’m not going to say, however it can be whatever you want, but no flycutting of the pistons is allowed.
I will say...... it’s probably less duration than you might think.
The 400 uses the same lift, but has heads with 2.11 intake valves.
It’s been 10.40’s@127+.