Ford engine question.

doogievlg said

My dad just found the intake number Lb33/4V. So it is a 4 valve. How much of an improvement are those heads.

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debateable...are you running 8000 RPM NASCAR? Its a velocity issue but with a logical build, they can work great. They are worth some $$, sounds like a gnarly Mach! shoot a pic of that LB33 intake, could be rare.