Discussion
Oooh - since it's a C4 - be aware of the following:
The inlet system on a C4 runs out of puff at circa 4000rpm - mainly since it's set up for low down pull, and second since GM actually designed and cast these manifolds originally for a 5.0 small block (they thought legislation was going to drive capacities down - luckily it never happened) - so you would do with working on the induction side with some higher flow runners/enlarged manifold.
So if you're trying to move more air with a capacity increase - it might be an idea to consider that so it doesn't 'choke' the engines potential. There are other options too, like the Accel Super-Ram or if I was going to do it, perhaps the TPIs Mini Ram - actually rumoured to havve been copied by GM for the LT-1. In fact, the manifold design alone is put down to most of the hp increase on an LT-1 over the L-98.
Good thing is, the capacity increase cancels out the slight loss of low down go that would be experienced with the short runner intake.
All this is bits I've gleaned from books and t'internet - so apologies can't say this is from actual experience! I was thinking of building (rebuilding) an '86 engine to this sort of spec after it did a big end, then found cheap second hand engine so stopped dreaming!
The inlet system on a C4 runs out of puff at circa 4000rpm - mainly since it's set up for low down pull, and second since GM actually designed and cast these manifolds originally for a 5.0 small block (they thought legislation was going to drive capacities down - luckily it never happened) - so you would do with working on the induction side with some higher flow runners/enlarged manifold.
So if you're trying to move more air with a capacity increase - it might be an idea to consider that so it doesn't 'choke' the engines potential. There are other options too, like the Accel Super-Ram or if I was going to do it, perhaps the TPIs Mini Ram - actually rumoured to havve been copied by GM for the LT-1. In fact, the manifold design alone is put down to most of the hp increase on an LT-1 over the L-98.
Good thing is, the capacity increase cancels out the slight loss of low down go that would be experienced with the short runner intake.
All this is bits I've gleaned from books and t'internet - so apologies can't say this is from actual experience! I was thinking of building (rebuilding) an '86 engine to this sort of spec after it did a big end, then found cheap second hand engine so stopped dreaming!
Don't think that will have an appreciable effect (extra power available will still make the whole package accelerate faster)
met a guy in the US who autocrosses a C4, rev's were very important to him to save constant gearchanges, his 383 was built to rev even harder than stock.
BUT - that'll cost a little more in more exotic steel whirly bits.
I think if you stroked without attacking the engine's breathing capabilities - you'd probably find it even more of a stump-puller, but as Stu says, perhaps a little less revvy than stock.
Is your car an auto or a manual?
met a guy in the US who autocrosses a C4, rev's were very important to him to save constant gearchanges, his 383 was built to rev even harder than stock.
BUT - that'll cost a little more in more exotic steel whirly bits.
I think if you stroked without attacking the engine's breathing capabilities - you'd probably find it even more of a stump-puller, but as Stu says, perhaps a little less revvy than stock.
Is your car an auto or a manual?
Gassing Station | Corvettes | Top of Page | What's New | My Stuff