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Old 07-12-2006, 03:39 AM
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Cam & Rear End

Hey everyone, I'm looking to drop the Comp Cams 270 K-Kit (#K11-207-3) in my mostly stock 396. It'll be running a Rochester with Sanderson block huggers, and an intake I've yet to decide on. My question is will I be able to run this cam with my 55-64 drop out housing 8.25 10 bolt Chevy rear end? I don't know the gear ratio of this old rear, and the drive shaft/wheels are off the car. Comp reccomends a 3.55-3.73 gearing. Any help??

Thanks, trevor

(forgot to mention, I'm new to this forum and I'll be putting my personal page together soon. I've gotten a lot of info from the forums and thought it was time to join!)

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Old 07-12-2006, 07:58 AM
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Stick a tire on it turn it exactly one full rotation and count how many times the driveshaft yoke turns.
If the front loader is out of it count how many teeth are on the pinion and how many on the ring.Divide the ring by the pinion.
With a 3.96 you've got lowend to play with so evan a 3.08 rear should still work with that cam its not that big for a bigblock(224@.050 intake,right??),especially if you've got some compression.
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Old 07-12-2006, 08:00 AM
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Matching the cam to the gear and stall speed and compression ratio is very important. You should really find out what you have before deciding on a cam.

Pull off the diff cover and count the number of teeth on the ring and pinion. To get the ratio, divide the number of ring teeth by the number of pinion teeth.

A 270 cam is pretty big and will not work well with a stock converter. A compcam 268H is about as big as you can go with a stock converter. If the car is a manual transmission then it doesn't matter.

Even a compcam 260H makes a strong runner on a BBC. If you are building a daily driver be careful not to over cam it.
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