$$ instead of $$$$ engine upgrade
HDF Community Team
Joined: Jun 2006
Posts: 12,763
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From: san antonio
I would wait until I could do 103, cams and heads but if the choice is limited to A or B; I would go with A but with a twist; here is why:
Since most of us ride between 2500-3500 rpms 75% of the the time; that's where you want to increase the performance and that is all about torque; not horsepower.
More cubic inches = more torque; more compression = more torque. Increasing the bore diameter will increase compression. The later heads flow almost as good as a set of budget "street" ported heads and have to come off for the BB kit anyway. So, put it back together with a .030" head gasket and select a set of cams that will provide a 9.3 corrected CR and 190psi cranking compression.
The performance gain from a cam upgrade is usually credited to the cams but in most cases the increase in compression deserves a fair share of the credit. Install a set of cams without setting the compression in the "sweet" spot for the cams won't produce the same results.
You mentioned "use whatever you have" to tune and that might be good enough, depends on what you have but whatever you do needs a good tune.
Since most of us ride between 2500-3500 rpms 75% of the the time; that's where you want to increase the performance and that is all about torque; not horsepower.
More cubic inches = more torque; more compression = more torque. Increasing the bore diameter will increase compression. The later heads flow almost as good as a set of budget "street" ported heads and have to come off for the BB kit anyway. So, put it back together with a .030" head gasket and select a set of cams that will provide a 9.3 corrected CR and 190psi cranking compression.
The performance gain from a cam upgrade is usually credited to the cams but in most cases the increase in compression deserves a fair share of the credit. Install a set of cams without setting the compression in the "sweet" spot for the cams won't produce the same results.
You mentioned "use whatever you have" to tune and that might be good enough, depends on what you have but whatever you do needs a good tune.
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jmb79
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Oct 21, 2013 08:30 PM
