Considering you'd have to run headers or a cam or intercooler just to run the 3.8, yes.
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My searching suggests the L67 pistons must have a larger dish in order to lower compression and increase piston-valve clearance.
A top swapped l36 on a stock pulley is supposed to be like an l67 on a 3.4 pulley
It was still slow.
I should have dyno'd it so we would have had solid information.
Yeah something was definitely off with your top swap matt. I couldn't understand why you were barely making the true power
it made 267 STD on a 3.4 pulley with rockers at 5200-5500 est RPM.
Never took it higher because I failed to hold the car in third.
With leaky valves and some odd compression numbers while churning out liquid metal every oil change.
Ahhh I see. I didn't know about the oil problem