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Old June 4th, 2016, 08:00 PM
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TJ's GMC TJ's GMC is offline
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Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
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Default Re: 5 speed/o.d. swap comparisons - WC/S10 T5 hybrid, NV4500, A833 MY6, Tremec 3550 Mustang

I would keep cruising RPM at a Minimum of 1500. I've noticed with my 305E since I've done the 4 barrel and dual exhaust that 1700-2100 is the sweet spot, and then for highway 2400 is Easily achievable. And that's with 4.11's and a 29-30 inch tire. I'm going to be putting 32's on soon. When under load the engine likes to be at 2000 and maintains very well without having to stomp on it when a grade comes. I'm considering Magnum heads for my 305 and milling them down so I don't Loose any compression. The larger ports, bigger valves, and bigger exhaust manifolds outta gain me a bit of power. And the bore size should be plenty big for that addition. Far as I know All cams from 305 to 478 were the same. You should try Delta Cams and see if they can Make you one. I know they will regrind, but they might produce as well.
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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
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