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Old 02-09-2013, 09:23 AM
Hoyt71 Hoyt71 is offline
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Intake Question For Vortec Swap And Future 383 Build

OK. This is the same 78 350 in a 5200# truck with 3.73 gears and 4 speed manual. Because of the tall tires my cruise is 2000-2200 rpm.

My end use will be a daily driver/tow/haul. I am on an extremely tight budget. My end result I think will be when I rebuild the engine and step up to a 383 build.

For now I am going to freshen up a set of used Vortecs and maybe a cam change.

I have been looking and reading about intakes and have a couple of questions. I want to be able to reuse the intake on a 383 but don't want to kill my 350. It looks like I need to stay away from the air gap type manifolds. Would something like the Performer RPM or similar manifold work well or is there a better choice? I didn't know if the runner size would kill my torque. I am not particular on brands. Is there much difference in tq/hp between the different dual plane manifolds? I am also looking at used parts for cost savings.

On a side note, will my Vortec heads be suitable for a 383 build or would I be much better suited with an aftermarket set? If aftermarket would be better, how much better on tq/hp would they be? This might dictate how much time and money I sink into a set of used heads. Thanks.
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