Question for the guys that know a lot about Kenne bell S/C
11-21-2018, 08:46 PM
#21
Race Director
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2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
they will lower the compression a bit compared to 243/799 and flow about the same as far as I know
Last edited by neutron82; 11-21-2018 at 08:51 PM.
11-22-2018, 01:29 AM
#22
Le Mans Master
and going beyond the point of diminishing returns with the intercooler drives doing something to make the cooling system better, like a chiller kit. we'll see how mine works soon.
317s flow about the same as LS2/6 heads from charts i've seen, but the bigger chambers (lower SCR) are better when you're wanting to run high boost... which might not help with as much heat as the KB produces when you wind it up. shop around the different LS engine forums' classified sections, and there's bound to pop up a set of ported 799/243s for $500ish every now & then. the bump in static compression would help bring the cylinder pressure back up after that cam's 8° overlap, which should increase responsiveness & off-boost power as well. you'll have a little less forgiveness in the tune with respect to fuel quality & IATs, however folks run 8-10psi all day on stock LS2/3s with a higher 11:1 just fine.
11-22-2018, 11:58 AM
#23
Melting Slicks
Thread Starter
you can make 600 without going to a bigger-bore block.
and going beyond the point of diminishing returns with the intercooler drives doing something to make the cooling system better, like a chiller kit. we'll see how mine works soon.
317s flow about the same as LS2/6 heads from charts i've seen, but the bigger chambers (lower SCR) are better when you're wanting to run high boost... which might not help with as much heat as the KB produces when you wind it up. shop around the different LS engine forums' classified sections, and there's bound to pop up a set of ported 799/243s for $500ish every now & then. the bump in static compression would help bring the cylinder pressure back up after that cam's 8° overlap, which should increase responsiveness & off-boost power as well. you'll have a little less forgiveness in the tune with respect to fuel quality & IATs, however folks run 8-10psi all day on stock LS2/3s with a higher 11:1 just fine.
and going beyond the point of diminishing returns with the intercooler drives doing something to make the cooling system better, like a chiller kit. we'll see how mine works soon.
317s flow about the same as LS2/6 heads from charts i've seen, but the bigger chambers (lower SCR) are better when you're wanting to run high boost... which might not help with as much heat as the KB produces when you wind it up. shop around the different LS engine forums' classified sections, and there's bound to pop up a set of ported 799/243s for $500ish every now & then. the bump in static compression would help bring the cylinder pressure back up after that cam's 8° overlap, which should increase responsiveness & off-boost power as well. you'll have a little less forgiveness in the tune with respect to fuel quality & IATs, however folks run 8-10psi all day on stock LS2/3s with a higher 11:1 just fine.
11-22-2018, 02:13 PM
#24
Le Mans Master
so sad to hear you'll be swapping her out 
but if you're changing cams anyway, i bet it'd be more efficient running a blower cam. as for specific specs, a few years ago, i was given a rough spec from a couple folks that's very similar to what Tooley now offers as the PDS Stg3 Torque version. what ended up in my car is the slightly-bigger standard Stg3, but the tune's just getting started, so we'll see how it turns out... (i am curious, though, not having seen that one in anything smaller than a 6.0 before).
but if you're changing cams anyway, i bet it'd be more efficient running a blower cam. as for specific specs, a few years ago, i was given a rough spec from a couple folks that's very similar to what Tooley now offers as the PDS Stg3 Torque version. what ended up in my car is the slightly-bigger standard Stg3, but the tune's just getting started, so we'll see how it turns out... (i am curious, though, not having seen that one in anything smaller than a 6.0 before).
11-22-2018, 03:11 PM
#25
Melting Slicks
Thread Starter
so sad to hear you'll be swapping her out
but if you're changing cams anyway, i bet it'd be more efficient running a blower cam. as for specific specs, a few years ago, i was given a rough spec from a couple folks that's very similar to what Tooley now offers as the PDS Stg3 Torque version. what ended up in my car is the slightly-bigger standard Stg3, but the tune's just getting started, so we'll see how it turns out... (i am curious, though, not having seen that one in anything smaller than a 6.0 before).
but if you're changing cams anyway, i bet it'd be more efficient running a blower cam. as for specific specs, a few years ago, i was given a rough spec from a couple folks that's very similar to what Tooley now offers as the PDS Stg3 Torque version. what ended up in my car is the slightly-bigger standard Stg3, but the tune's just getting started, so we'll see how it turns out... (i am curious, though, not having seen that one in anything smaller than a 6.0 before).
11-25-2018, 11:35 PM
#27
Le Mans Master
i didn't think i did... but you're welcome (i guess)you suggested going with a bigger bore; i believe he could make his goal on stock cubes (yeah, it'll take a little more boost but still cheaper than a new block)
you noted the limitation of the intercooler; i offered a way to improve its efficiency so as to push that ceiling higher
or maybe i missed something else
