newschool72
11-11-2013, 08:34 AM
I just thought Id share my LS3 combo to maybe help someone out looking for great power, but with 1750rpm cruising with a lockup converter with no lugging around. I have a 72 Camaro that I put together for cruising/light auto cross/ occasional 1320 action. After a lot research on the LS3 heads and cam profiles, I dug up where the guys over in Australia were making great power by using tiny cams and letting the great head flow carry the upper RPM power. I also dug up an engine that D&A built for the Engine Masters Challenge a few years ago. They made 525ft lbs at 2500 rpms in a 409 6.0 based LS stroker, It peaked at 575 ft lbs at a very low 3500.The reason they made the great power was a short duration with a tight LSA and a good bit of advance built in AND the stellar GMPP Dual Plane intake. I got with Tim at Bullet Racing cams to map out a cam profile that used some of the info I had gathered.
My cam specs at 220-230 at .050 on a tight 108+4 LSA and a 629 lift on both sides. I am using the GMPP dual plane intake and fast EZ EFI. Other than the appropriate springs and a set of Hedman coated long tube headers (1 7/8), that's all that's been done to a stock LS3 GM crate engine. It makes excellent torque at very low RPM and carries power all the way to the 7000rpm rev limiter.
With a race weight of 3485 lbs, a 2004R trans with a 2800rpm lockup converter, 3.42 gears in the back, I went 11.65 at 118 mph with a lot of feathering and spinning off the line (1.875 60 ft) this weekend. That in of it self is pretty solid performance for a mild cam in a stock long block. It is turning an AC compressor and power steering as well as pulling 16" of vacuum for my big brakes.
The biggie is that it will do all that AND cruise at 1650-1750rpms with the converter locked up on some pretty steep hills without a hint of lugging ! This engine has the beans to run very low 11s , or maybe even a 10.9x without any trade offs at all. it even gets 20+MPG !
It should be a super combo for auto cross, too, as the power is ALWAYS there for the taking. It has no dead spot in power from idle to 7K.
I just wanted to share this combo I came across and I would be glad to see some of the guys on here take advantage of what it offers.
Thanks for looking and Good Luck!!
My cam specs at 220-230 at .050 on a tight 108+4 LSA and a 629 lift on both sides. I am using the GMPP dual plane intake and fast EZ EFI. Other than the appropriate springs and a set of Hedman coated long tube headers (1 7/8), that's all that's been done to a stock LS3 GM crate engine. It makes excellent torque at very low RPM and carries power all the way to the 7000rpm rev limiter.
With a race weight of 3485 lbs, a 2004R trans with a 2800rpm lockup converter, 3.42 gears in the back, I went 11.65 at 118 mph with a lot of feathering and spinning off the line (1.875 60 ft) this weekend. That in of it self is pretty solid performance for a mild cam in a stock long block. It is turning an AC compressor and power steering as well as pulling 16" of vacuum for my big brakes.
The biggie is that it will do all that AND cruise at 1650-1750rpms with the converter locked up on some pretty steep hills without a hint of lugging ! This engine has the beans to run very low 11s , or maybe even a 10.9x without any trade offs at all. it even gets 20+MPG !
It should be a super combo for auto cross, too, as the power is ALWAYS there for the taking. It has no dead spot in power from idle to 7K.
I just wanted to share this combo I came across and I would be glad to see some of the guys on here take advantage of what it offers.
Thanks for looking and Good Luck!!