Have an LS2 and wondered what gains swapping to an LS3 top end would net? Check it ou

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Jan 21, 2012
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Vehicle is an 06'GTO, SI5V2 cam, SLP 1 3/4" headers, K&N CAI, and Automatic trans with SS3600 converter. We installed UNPORTED LS3 heads, that were milled .025", and stock LS3 intake. We had to flycut the pistons (in car) to clear the stock LS3 valves. The baseline run includes all mods, other than the LS3 top end. Dyno graph below:


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