Smallish LS-R head package...

[Walter R. Malik]

I can now see that few here take aim for a target power level higher than what you actually expect to get.

I don't want to be satisfied but, always trying for more.

[CGT]

I can now see that few here take aim for a target power level higher than what you actually expect to get.

I don't want to be satisfied but, always trying for more.

I am always trying as well, but 600lbs just isn't gonna happen(at or beyond Pro Stock level tq per inch) Im sure you'll end up with something nice regardless, interested to see how you end up on this.

Thanks
C H A D

[Walter R. Malik]

I can now see that few here take aim for a target power level higher than what you actually expect to get.

I don't want to be satisfied but, always trying for more.

I am always trying as well, but 600lbs just isn't gonna happen(at or beyond Pro Stock level tq per inch) Im sure you'll end up with something nice regardless, interested to see how you end up on this.

Thanks
C H A D

Well ... my 382 made 607 lb/ft @5,700 RPM and that equates to 588 for a 370 so, I don't personally think it is that far off for a target to shoot for.

[CGT]

Well ... my 382 made 607 lb/ft @5,700 RPM and

On gas?? No oxy? hmm

[Walter R. Malik]

Well ... my 382 made 607 lb/ft @5,700 RPM and

On gas?? No oxy? hmm

On contest provided "VP Motorsport MS109 unleaded gasoline" so, if you are counting 10% Ethanol as Oxy; so be it.

Realistically ... high octane pump gasoline.

[CGT]

Well ... my 382 made 607 lb/ft @5,700 RPM and

On gas?? No oxy? hmm

On contest provided "VP Motorsport MS109 unleaded gasoline" so, if you are counting 10% Ethanol as Oxy; so be it.

Realistically ... high octane pump gasoline.

Cool

[Newold1]

Torque is a greatly determined by outstanding volumetric efficiency. If the VE is up there a 600lb/ft. result is very doable on a great 370 CI LSX engine. JMO Great cylinder heads operating of an ideal camshaft with moderate compression and good fuel should be able to reach some pretty awesome torque in reasonable ranges. I think the last 8 years of Engine Masters builds demonstrated that possibility. NEVER SAY NEVER!

[Geoff2]

Jon Kaase won the EMC with a 400 Ford, 617 ft/lbs at 5200. Used a lot of 'wrong' parts: long stroke crank, short rods, cam with LESS exh duration, 98 LSA, 92 ICL.

[CGT]

Jon Kaase won the EMC with a 400 Ford, 617 ft/lbs at 5200. Used a lot of 'wrong' parts: long stroke crank, short rods, cam with LESS exh duration, 98 LSA, 92 ICL.

Thats 1.54 tq per cube. 600 out of 370 is 1.62.

[Rowdy Yates]

With working with any head knowing the valve placement kinda sets the valve limits for the intake and exhaust sizes . There are a few CHI heads that run a larger intake valve 2.20+ that will fit a smaller bore. Ls heads as well that will work with a smaller bore just work being done. I've talked to G. Good, C. Boggs, C. Frank, Darin..... about a few different heads sets LSR also. Mast SRT 8 heads are C5r heads with tweaks for a larger intake valve..Small bore head that uses a 2.230 valve. Like the idea but don't like the idea of one runner size or CSA fits all. Most think Ls7 heads won't fit a smaller bore....And the intake valve is not the problem. Heck of a difference in port size VS a Ls3 head.. Ls3 has more CSA because of runner design but the Ls7 has more CC in runner size, runner's placed higher and is a longer runner with larger valve 2.20 vs 2.165 for the Ls3. Big difference in CSA Ls7 being smaller with more CFM under .400 lift = more Tq with equal flow above. 400 lift. The LSR has a even better valve placement footprint. 2.165+ valve size with a matched CSA for combination size and given Rpm even with a smaller bore. When I found out that I couldn't get hollow stem valves for C5r heads nor LSR heads being that there over 6 inches long was a deal breaker. Most Cleveland standard runner placement have valves under 6 inches besides the raised ports SC1,CHI 3v Pro,Blue Thunder raised runner 6+ valve length .... Cool thing is you start with a blank canvas and can build it as wanted for a given build. The LSR is darn good head. And they finally made a intake. As my old uncle Jim says do a $ to HP ratio.

[Geoff2]

1.62tq/cube @ 5700. It will be less every where else in the rpm range & may well fall below the Kaase engine. Not taking anything away from the poster's engine, very respectable #s.