Originally Posted by unreal
8 rib and direct drive. Currently 2.85" upper and a 7.25" lower. Need to goto a 8.0"/3.15". Elevation also kills boost, and my heads are huge so that lowers boost. They flow 410+cfm and I have a big nasty cam. With stock heads/cam it would be 20+ easy.
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410 is sick, thats like race car heads for a Mustang...
an 8 lower with a 3 upper will make a huge smile on your face... should be around 18-20 psi Id think. I was making about 27 psi with that setup on my 408 about 10 years ago.
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