Quote:
Originally Posted by vatdevil
SPF 522 has a new KC 427 with ported Air Gap dual plane, 236/242 @ 050 cam, aluminum flywheel. excellent street manners, cruises at 1600 rpm, instant throttle response, and a very broad torque curve... ample power everywhere.
4.10 is a lot, especially with an aluminum flywheel. my motor unwinds quick, shifts need to be very fast or rpm drops too much. Currently have 3.90s and plan on dropping to 3.27
On the diff, solid bushing mounts will take care of wheelhop, a major contributor to broken halfshafts. Purchased them from Craigs Cobras.
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Congrats on your new motor it sounds like a great power plant. I can see why you desire a gear change as you probably have a great range of power whey my car did not. With the broad range of power that you have the 3.27 will probably work great for you.
Maybe I am thinking about this incorrectly but when you go from 3.90's to 3.27 isn't your motor going to unwind quicker? My car with the 3.31 would drop rpms very quickly and i was really noticable in the 1-2-3 shift aroud town. I have been advised to keep the aluminum flywheel if I go with 4:10's
I spoke to Craig about his solid mounts and he said he did not advise using them on a street car used for cruising IF the sound of the differential clunking around would be noticed as it could be irritating to some. Have you experienced this with your upgrade?