383 build using Log exhaust.
04-07-2018, 02:16 PM
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383 build using Log exhaust.
I'm doing a Merc 383 build for a 1982 24' express cruiser.
I have two items possibly limiting my build
1. Still going to use log style manifolds and through hub exhaust.
2. Rear deck (engine is under the floor) that is only 4" above top of carb (without flame arrestor) with the stock intake manifold.
This is going to be a ground up build, budget is some-what of a concern, hence the log manifolds stay.
My engine builder (who is going to dyno break-in and tune the engine) is telling me there is not much more to gain past vortec heads or even aiming for excellent quench by going to aftermarket alum heads with a larger chamber. How true are his statements ?
I have two items possibly limiting my build
1. Still going to use log style manifolds and through hub exhaust.
2. Rear deck (engine is under the floor) that is only 4" above top of carb (without flame arrestor) with the stock intake manifold.
This is going to be a ground up build, budget is some-what of a concern, hence the log manifolds stay.
My engine builder (who is going to dyno break-in and tune the engine) is telling me there is not much more to gain past vortec heads or even aiming for excellent quench by going to aftermarket alum heads with a larger chamber. How true are his statements ?
04-07-2018, 06:12 PM
#2
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How true are his statements ?
Listen to yer motor builder,.....
Vortec heads, quench of 'bout .040", 'n inverted dome, or D-dish pistons to keep the compression ratio right at, or just below 10:1,....
