Largest(Safe) LT1 Bore
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Boreing to get displacement would be a big mistake. Strength of the wall goes down FAST with very little gain in displacement.
It also is NOT displacement that makes power, it is airflow which is the job of the heads and cam, displacement will affect powerband and peak power rpm but not so much peak power number.
Someone on a racing forum I frequent put it well when he said "build the biggest engine your heads will support". I know that goes against everything newbs "know" about there being "no replacement for displacement" but it is true that cubes only work if there are heads to feed them.
It also is NOT displacement that makes power, it is airflow which is the job of the heads and cam, displacement will affect powerband and peak power rpm but not so much peak power number.
Someone on a racing forum I frequent put it well when he said "build the biggest engine your heads will support". I know that goes against everything newbs "know" about there being "no replacement for displacement" but it is true that cubes only work if there are heads to feed them.
Biggest benefit of the big cube engines is the torque. Peak hp will not raise much, since power is made in the heads and cam. Most only go up to 396, but people have done over 400 - TPiS had a 409 package for some time. The benefit for the the extra price paid is debatable over a 383.
Block needs to go through thorough testing before going that big either way.
Block needs to go through thorough testing before going that big either way.
i wasn't going to displacement only! i was looking for more torque, also i hope the heads im looking to invest in will flow enough. But we'll see... It's hard to decide between 383 or 396, for the price is it worth it?
The bigger bore will probably perform better if you are running bigger than stock valves (regardless of stroke).
The rod ratio is kinda crappy on a 396, it is hard on the thrust side. Most 396 combo's have the oil ring in the wrist pin.
You can build enough power with a 383 to put you in the ditch on the street and it's life span is a good bit longer than a 396+ cube engine.
I would say a .040 overbore is max safely.
David
You can build enough power with a 383 to put you in the ditch on the street and it's life span is a good bit longer than a 396+ cube engine.
I would say a .040 overbore is max safely.
David
