ls1 combo set up
Some details about the 347..approx HP or ET in runs would help us help you build a motor to beat him.
Is this a DD, street car,street strip, what?
Without knowing anything on the 347, im going to say your going to need some beast *** 243 heads, milled and CNC ported, a mid to high 23X duration camshaft, FAST intake, a converter to match the cam if its an auto or a good clutch and 4.10 gears if its a stick.
And a 12 bolt/9" if you dont have one already.
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The most anyone with credibility would suggest would be .010 over. Mahle has pistons for the 3.908 bore but IMO, I would go with a 3.903 or 3.905 Wiseco, Diamond, or JE before Mahle.
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