Changing Up My SBE LS3 Combo
I put together a very similar SBE build last year. Cam (Cam Motion custom specced by me) is similar at 226/234 115+4 .620/.620. TxSpeed CNC ported stock LS3 heads milled .010 with .041 Cometic head gaskets. GPI ported and rod modded intake manifold. Veraram, 1.875 headers, Z mufflers, u/d crank pulley etc. Corrected dyno showed 500/454. Torque was at or above 450 from 4200-5500. It pulls pretty damn hard just about any time I punch it. Very pleased with it, and after more than a year, I wouldn't change a thing.
My son did most of the work. I set up the valve train....and got that wrong. I had Comp 7.4" push rods in stock and tried to make them work with the Caddy lifters. Too much preload. The thing fell off the table at 6250 rpm. Just quit pulling. Put some 7.35" in and she pulls hard to 6800 rpm now. Haven't had it on the dyno since then, but I think the longer push rods cost me a few hp.
Lazer has better heads and better intake mani. Should be interesting to see how he does. Don't know if I'll ever get mine to the strip. Our local strip closed and the next closest one is 90minutes each way. At 65 years old I'm not quite as mad at the qtr mile as I used to be...
My son did most of the work. I set up the valve train....and got that wrong. I had Comp 7.4" push rods in stock and tried to make them work with the Caddy lifters. Too much preload. The thing fell off the table at 6250 rpm. Just quit pulling. Put some 7.35" in and she pulls hard to 6800 rpm now. Haven't had it on the dyno since then, but I think the longer push rods cost me a few hp.
Lazer has better heads and better intake mani. Should be interesting to see how he does. Don't know if I'll ever get mine to the strip. Our local strip closed and the next closest one is 90minutes each way. At 65 years old I'm not quite as mad at the qtr mile as I used to be...
Thread Starter
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Joined: Feb 2004
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From: VA
Well you confirmed what we were thinking on the torque side of things. My heads are milled .042 to my compression is around 11.5:1. I did flycut .120 valve reliefs when I had the ss4 cam in. I think we will be right on par for a solid 460 torque and 520 power. I have a crank scraper, electric water pump, 2x2.25x3" tri y headers and still using the NPP exhaust. With some ethanol we can possible crest the 460 torque too. Just have to play with percentages and see where it likes it most. 40% should do the trick.
Thread Starter
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Joined: Feb 2004
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From: VA
Loved mine too. But, the reality was that I had WAY more car than driver ability. I took 650rwhp and drove my way to 10.8's and 133mph. It was hot....couldn't hook...wife was mad...planets weren't aligned...yeah, you get the drill.
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From: VA
appreciate the info but I have done my research. What did your combo run at track? I’m also building my car the way I want to daily drive it as well. 26” tire will accelerate faster than a 28”. I have focused the whole build on acceleration mods not just power. Still could do race brakes but have no plan to
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Joined: Feb 2004
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From: VA
I took 450 whp and drove it to 10.58@131 and 530whp to 10.62@134.8 lol I know the frustration.
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From: VA
My car is a ls 2 with ls3 heads . I drove it 260 miles to the track round trip it ran 11.24 @124 on soft launch 1.614 /60 I wanted to get home .first time I took it to the track. Anyway lam on nitrous now 614 hp 656 torque @ the rw so low 10s will be no problem now . Anyway it made 494 hp/444 torque NA thru a 4.10 car just needs a driver mod @68 iam doing the best I can
Thread Starter
9 Second Club
Joined: Feb 2004
Posts: 818
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From: VA
My car is a ls 2 with ls3 heads . I drove it 260 miles to the track round trip it ran 11.24 @124 on soft launch 1.614 /60 I wanted to get home .first time I took it to the track. Anyway lam on nitrous now 614 hp 656 torque @ the rw so low 10s will be no problem now . Anyway it made 494 hp/444 torque NA thru a 4.10 car just needs a driver mod @68 iam doing the best I can
Thread Starter
9 Second Club
Joined: Feb 2004
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From: VA
my old cam was a 236/254 and I had a short runner intake. Drove fine accelerated fine. But that’s not good enough for my goal. I want grunt and when I’m cruising down the highways I want mpg too. If my stock cam got me to 10.58 we should surpass that pretty slick this time.
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My son did most of the work. I set up the valve train....and got that wrong. I had Comp 7.4" push rods in stock and tried to make them work with the Caddy lifters. Too much preload. The thing fell off the table at 6250 rpm. Just quit pulling. Put some 7.35" in and she pulls hard to 6800 rpm now. Haven't had it on the dyno since then, but I think the longer push rods cost me a few hp.
I probably just butchered that all to hell. Maybe some of our more learned and experienced members can clear the fog I created.