The blown SB2 is hard to pull off in a street motor. Since SB2 heads are 48CC to 54CC Chambers, a 2 ring piston is required to build a deep enough dish piston to lower compression enough to blow it. And 2 ring pistons on the street are not the hot set up. Thats the bad news.
The good news is a big cube SB2 motor does not need a blower to make 700HP by accident!
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Frank Serafine
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