Quote: Aussie Pro Stock runs them at 399 cubes generally. Most of the Aussie Pro Stock blocks run around a 8.7"-9.0" deck. I think the R4's are around 8.8"-8.9" standard. Most comp guys will deck them down as far as 8.4" (which basically starts to cut into the bell housing pattern). The Aussie heads are an exact copy, right down to the cracks apparently. AL...
I like BOOST!!!
That's not a combo that would want to work very well with Turbos.
And if the heads are prone to leaks/cracks. Turbos would definitely find them.
