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Discussion Starter #1
Talking with some local guys about doing a 4.00 or a 4.125 bore. They say do the 4.125 to unshrouding valves. Being that air is forced in does it really help on a boosted application? I dont see a lot of difference in cars with a 347 to a 363 performance wise. Thanks Matt
 

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Yes. In na, the motor sees 14.x psi. In a turbo motor, it sees 14.x psi + boost pressure. Same physics, just at a higher pressure.
 

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Discussion Starter #5
Thats was my agrument. Leave it smaller to keep from sleeveing it for as long as possible. But is there any real power gains either way?
 

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big bore as you can go.

dont put a 4.060 head on a 4.125 bore

many do this and don't realize it.
 

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Its nothing 1 psi of boost cant make up for.

When it comes to a turbo motor... matching the N/A hp of the motor to the compressors is much more critical. 90% of the time... all those little tricks to pick up N/A hp is pointless.
 

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Discussion Starter #8
I have the 77189 vic jrs. What bore is better for them? Im only building 1 motor for a while and all the pieces need to work together.
 
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