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Old 01-20-2019, 12:13 PM
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Actually, since you only have a 3 keyway crank gear, than your choices are in 4 increments. You can only retard it 4 to get it to straight up. Definitely check it with a degree wheel, it's easy to get mixed up with which keyway does what. You're going to have to run premium fuel with this combination.

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Old 01-21-2019, 10:53 AM
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DD help

According to the supplied cam card, intake lash is .12 and exhaust is .14 thousands. Thanks.
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Old 01-21-2019, 01:50 PM
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.12 and .14 seems pretty big. Just kiddin.
Ya meant .012 and .014.

Lash can be pretty much whatever the cam grinder wants bith those are in the normal range.
Lash also effects the cam timing numbers in the DD program so it's something to be aware of.
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Old 01-22-2019, 11:47 AM
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As I suspected, the default value for valve lash in the program was much larger at .028". Dropping it down to your actual numbers makes the cam bigger. This dropped the cranking compression down to 176 with the cam advanced as ground. Using the thinner head gaskets only makes it 183 which is OK.

With the exhaust manifolds, peak torque is 246ft/lbs and peak hp is 189. Adding long tube headers, makes everything jump up substantially. Peak torque comes up to 258, and hp jumps to 204. Having the effective cam timing larger makes it more sensitive to exhaust back pressure. When you run cast iron manifolds, it's better to widen the lobe centers to something like 114 to minimize reversion on valve overlap.

What you have is good, run the thinner head gaskets, and seriously consider headers. No need to retard the cam.

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Old 01-23-2019, 09:25 AM
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DD help

Thank you so much for the info, and yes it is .012 and .014, decimal points matter! Hopefully I will be pleased with this cam.
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