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From what I understand, when running factory exhaust manifolds, you’re better off with a 112-to-114 centerline.

Also, as already mentioned in this thread, go with a custom cam for your application.

In my 383, I’m going with a Mr. SixPack custom grind from Engle Racing Cams which is designed by Bob Karakashian. The cost is a bit more than an off the shelf cam but worth it. $235.00 to your doorstep and that dose not include lifters.

But that cam has bone stock 440-6s running in the high 11s on factory polyglass tires. You might be able to get the ETs you’re after with you're 383.

You can give Mr. Karakashian a call and he’ll talk it over with you.



Mr.6Pack Racing Engines - link

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Been running Bob's Mr. Sixpack cam for 3years now... I pulled an MP .484 out of my 9.6:1 383... I run 3.23's (currently) and manifolds, FWIW, I wouldn't run that MP cam in anything less then a 440 in a B-body too much weight

Very happy with the Engle/Bob K piece