LS7 Automatic
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From: wisconsin rapids, WI
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When GM decided to put a supercharger on an LS engine, they considered using both the LS3 and LS7 as a starting point. They ended up going with the LS3 because its thicker cylinder walls are better suited to the increased cylinder pressure. As a result, both the LSA (CTS-V) and LS9 (Corvette ZR1) are based on the LS3 (they use the exact same block!).
The L99 is just an LS3 with VVT, DOD, and a different cam profile -- the block and heads are identical. I've seen 505 hp at the rear wheels from an LS3 with a big cam and longtube headers. That translates to roughly 575hp at the flywheel.
With a VVT-enabled L99, you should be able to achieve similar peak horsepower while also maintaining a broader torque curve than any non-VVT engine.
Personally, I think the L99 is the most interesting engine GM has ever made from a modification and power potential standpoint.
If it were me, I'd stick with your L99 and see how far you can get with it. If you still want the big cubes, get it bored and stroked to 418ci (that's 97.9% the displacement of the LS7). You'll still have thicker cylinder walls than an LS7, making it still the better platform for forced induction.
You can do all of that, including the supercharger, and you'll still probably have spent less than you would on a bone-stock crate LS7.
Then you can use that money to beef up the rest of the drivetrain. You're going to need it!
The L99 is just an LS3 with VVT, DOD, and a different cam profile -- the block and heads are identical. I've seen 505 hp at the rear wheels from an LS3 with a big cam and longtube headers. That translates to roughly 575hp at the flywheel.
With a VVT-enabled L99, you should be able to achieve similar peak horsepower while also maintaining a broader torque curve than any non-VVT engine.
Personally, I think the L99 is the most interesting engine GM has ever made from a modification and power potential standpoint.
If it were me, I'd stick with your L99 and see how far you can get with it. If you still want the big cubes, get it bored and stroked to 418ci (that's 97.9% the displacement of the LS7). You'll still have thicker cylinder walls than an LS7, making it still the better platform for forced induction.
You can do all of that, including the supercharger, and you'll still probably have spent less than you would on a bone-stock crate LS7.
Then you can use that money to beef up the rest of the drivetrain. You're going to need it!
American Racing headers with Cats $1800
Cam? ( Not to lumpy please)?
Bore and stroke Kit? From who?
Etc......
Paint me a road map, please.
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WobblySausage
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Oct 7, 2015 10:09 AM