[KingLT1]

Originally Posted by dreksnot

So, am I to presume neither is better or worse than the other? There are nuisances with each. For someone like me who desires a reliable, safe 800-850whp without cracking open the motor for a cam or heads, either would work fine without breaking a sweat. Add supporting low side and PI fuel supply for full E85 and go! Would I need headers (w/ hi flow cats here)? Would a 103mm TB do fine? A 120mm sure sounds like less restriction but wouldn’t that make idle/cruise tuning more difficult?

Guess I do have to mention, I’d like actual 800-850whp hitting the pavement (not SAE sea level corrected) but I’m at altitude. If I dyno’d now I’d be around 460whp so there’s a nice stretch in numbers to get there. Still possible with what I’ve mentioned as to how I’d like to get there?

I think both the 2650 and 3.0 would be beyond max to hit 800whp uncorrected at altitude with a stock long block. JSH needed heads, cam, ported Eddie 2650, 20 psi to hit 850 uncorrected, and the manifold air temps were getting hot. The 2650 was almost maxed to do it. In your case it might make more sense to go Huron speed twin kit.

[Katech_Mike]

Originally Posted by Joshinator99

Out of curiosity, what is highest blower rpm you’re seeing out of the 3.0 so far (on any platform)?

We have one that we're spinning a little over 20,000rpm. Makes 18psi on a 416ci engine and 1070rwhp on our dyno.

The most we've made with a 2650 (unported) is 1080rwhp through an 8 speed and that was with a tick over 25,000rpm on a 427ci engine for reference.

The 3.0L is promising but I'm afraid to spin one super hard to see where it'll go.

[ZL1Atlanta]

Originally Posted by Katech_Mike

We have one that we're spinning a little over 20,000rpm. Makes 18psi on a 416ci engine and 1070rwhp on our dyno.

The most we've made with a 2650 (unported) is 1080rwhp through an 8 speed and that was with a tick over 25,000rpm on a 427ci engine for reference.

The 3.0L is promising but I'm afraid to spin one super hard so see where it'll go.

Makes sense. I’d expect 60-80 WHP from porting the 2650 at that RPM assuming the engine was efficient and boost stayed relatively low.

[dreksnot]

Originally Posted by KingLT1

I think both the 2650 and 3.0 would be beyond max to hit 800whp uncorrected at altitude with a stock long block. JSH needed heads, cam, ported Eddie 2650, 20 psi to hit 850 uncorrected, and the manifold air temps were getting hot. The 2650 was almost maxed to do it. In your case it might make more sense to go Huron speed twin kit.

The SAE correction factor up here is 1.22 - that's a lot of loss. Hitting an 850rwhp at sea level equates to around 700rwhp on pavement here, not to mention I will have to deal with emissions (save the cats!). I've had hefty turbos in my past and loved the power (that's the way to go for big power). But, I'm really liking the instant torque hit of the SC. Both worlds would be grand (twincharged). I suppose a max SC (2650 or 3.0L) build on the SBE could be all I could ask for - see what that yields. Realistically, 700rwhp up here is probably all I could expect without serious motor mods. Thanks for the input - adjusting course.

[KingLT1]

700-750whp uncorrected would be doable for sure. And I understand about Turbos. I love the simplicity and torque of PD as well.

[laynlo15]

On my 16ss we made about 850 on 14-15 psi of boost with a non-ported 2650 and forged Manley short block, cam and stock heads except for springs. That was on MS109 race fuel and meth.
When I broke that stock Lt1 crank, bought a stock Lt4 short block with Btr cam from Carlyle racing, we did go to a bigger springs but the heads were still stock. It still made about the same power, we never had high intake temps at those power levels. We could have made much more power, but at that time in 2019 the fuel systems were still high priced and with the Lt4 fuel system upgrade with a boost pump we just didn't have enough fuel to make more.