Best heads for 500hp?
As for your post in 166, HiO, it DOES absolutely work that way in ANY scenario. It's physics. The larger diameter the tire is, the more stress it puts on the axles to turn the wheel. There's no other way. In the inverse, this is exactly why when guys put 45" tires on their 4×4s, they wonder why their brakes now suck.....
Last edited by grinder11; Dec 21, 2025 at 12:44 PM.
That's not what they're for at that point usually.......although I did drive my 10sec bolt on ls6 from the top of Virginia where I live to Atlanta a couple times.
At some point you get into the whole street car vs race car debate. Putting a stock engine in a race car is basically what robz had......no different than any of the other record cars.......but it does usually get some cool results.
You go putting a race engine in a street car........usually gets you some shitty results.
Which is why I said I can see a bolt on ls6 running 10.0......after having one that went 10.7@130ish. He i bet mine had a 10.4 or 10.5 @ 133~ in it after we found some more power in it. And it coulda drove to Atlanta again just fine......cruise set and all.
When we went 10.5@132 with phils bolt on ls3 c6......it was his daily. That car was very simple and could have easily went much faster.
As for your post in 166, HiO, it DOES absolutely work that way in ANY scenario. It's physics. The larger diameter the tire is, the more stress it puts on the axles to turn the wheel. There's no other way. In the inverse, this is exactly why when guys put 45" tires on their 4×4s, they wonder why their brakes now suck.....
So in that particular circumstance that theory don't hold up......this isn't a 4x4 we're talking about
Exactly. This is why a max build 346 will beat my 427. My LS7 isn't a max effort build. It's a 1,250 mile drive-EACH WAY-from Michigan to Florida. So I spend 2,500+ miles each year on the freeway, on just that one trip alone. I drove my first 427 in 2006 about 7,000 miles in 2 weeks when I drove this same C5 from Michigan to California and back. I averaged 25mpg on that trip. No problems, even in 120° heat. One day, it was 118° in Baker, California at 10:30 A.M.!!! Sure, I coulda built a much more rad version, and shot for the 9s. But I would've hated to drive it those 7,000 miles. At my age, your priorities are different. I learned a long time ago that anyone who has the fastest/quickest bike/car wont have it for long. Theres always someone that comes along who is faster. So I lost interest, quickly. Too much time, too much $$$$. But that's just me......
Sure, a bigger sidewall helps. But put the big sidewall on a 26" tire and it'll stress the axles more than a big sidewall on a 27. I guess it really is time to go. I'm not trying to get you to see everything my way, but man, when you make up your mind, nobody is gonna change it. I have made some valid points, and you've thrown every one of them under the bus. Carry on.......
No. In my asphalt late model program, I ran a QuarterMaster 5.5” setup. I had to change the discs every winter. I only used the clutch in the pits, and/or if we had an issue that stopped the field on track, to get the car moving again. 2800 lbs with me in it. Didn’t touch the clutch…or even fully lift off the throttle…when changing gears on starts….and I tried to tear the shifter handle off of it while shifting to keep the car that’s 2 feet off my bumper, from running through me. The disc material is very thin when new, and isn’t designed to last long. The big money teams would change discs every 5 races. I had Johnny Hightower in South Carolina lighten my complete clutch setups, but that does not affect disc life at all, fwiw.
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Facts taller tire with more sidewall like a 28 vs 26 on the same 15” wheel helps absorb shock and is easier on the driveline.
Sure, a bigger sidewall helps. But put the big sidewall on a 26" tire and it'll stress the axles more than a big sidewall on a 27. I guess it really is time to go. I'm not trying to get you to see everything my way, but man, when you make up your mind, nobody is gonna change it. I have made some valid points, and you've thrown every one of them under the bus. Carry on.......
You have been wrong on many things and continue to argue things can’t be done which have literally been done with proof and you still are in denial.
The only reason the 346 vs 427 debate came up is because you called bs on the times the 346 ran and you and the other guy said you were insulted that anyone would claim their 346 ran a better et than his pathetic 11.5 with a 427. I simply gave examples of what a 346 combo could do that would allow it to run faster than that 427 in a drag race. You then went on to move the goal posts about how a 427 is better if both builds were done by the same guy at max effort. Well no kidding lol but they weren’t the same level of build by the same guy that’s why the 346 in question here that you called bs in ran faster than you. The builder was better and the combo was better with a better driver.
How in the hell is a bolt on car running 10’s that drives across the state not a street car. Lol.
My car practically runs 8’s and can drive all day in the summer in stop and go or long drives at 80 on the interstate without a problem.
Some folks are better at this than others so they think because they can’t do it no one can. Plenty of people better than I am doing drag and drives running faster than I ever thought possible as well.
heck one guy in here hasn’t ever built a motor or even installed a cam before or tuned a single car and is calling bs on a 346 running 10 flat. Well ya he’s never even gone 12’s so of course it seems impossible to him. And when you’ve done something with witnesses and someone says your full of **** it tends to get heated quick lol.
My car practically runs 8’s and can drive all day in the summer in stop and go or long drives at 80 on the interstate without a problem.
Some folks are better at this than others so they think because they can’t do it no one can. Plenty of people better than I am doing drag and drives running faster than I ever thought possible as well.
heck one guy in here hasn’t ever built a motor or even installed a cam before or tuned a single car and is calling bs on a 346 running 10 flat. Well ya he’s never even gone 12’s so of course it seems impossible to him. And when you’ve done something with witnesses and someone says your full of **** it tends to get heated quick lol.
It’s also predictable how these types of discussions go. I call bs no way you run those times. Then it’s proven and detailed how it was done. Then omg that doesn’t work. Yes it does here is why. Oh bs anyone faster than me must be a race car then my car is a street car lmao. Every time lol. Anyone faster than me doesn’t have street car it’s a race car lol. Every time.
Hell, another Rob I know has gone 9 flat at 150 in his SBE LS7 (stock cam too @grinder11
) in his C6Z. 
A car with a clutch that needs replaced every year isn't my definition of a street car. If you have enough money to replace a clutch every year more power to you, but this isn't 99% of registered and inspected street cars.
Using the same logic, why not replace that heavy 6 speed with a 4 speed M22 Rock Crusher? There has to a weight savings if someone can fab a way to make it work.
Using the same logic, why not replace that heavy 6 speed with a 4 speed M22 Rock Crusher? There has to a weight savings if someone can fab a way to make it work.
Last edited by wannafbody; Dec 22, 2025 at 09:20 AM.
False traction wins street races. I’m pulling timing out down low to reduce torque on a combo not even known for low rpm torque this has led to me actually being faster with less low rpm torque. I also have ballast in the rear so it’s not all about total weight either but where the weight is located especially on no prep.
9 Second Club
Joined: Feb 2004
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From: VA
What an interesting read lol Man the disbelief in here is unreal. 2004 5.7 in my 2000 trans am with 4.56 gears in the 10 bolt made 450 rwhp with gmpp heads and grand am cup cam. It made peak power at 6600 with the ls6 intake and junk mid length headers. In 2016 my bolt on ls3 made 470/468 in a 2015 m6 camaro 1le full weight with used nt05 drag radial went 11.5@120. Then my bolt on ls3 vette made 467/453 tri y headers and turning a power steering pump and 4.10s went 10.5@131. I recently took my bolt on 2015 Z06 with stock manifolds through stock exhaust 842/760 went 9.0@148 and had a best mph of 150. There is no reason a ls6 c5 z06 couldnt run 10.0 bolt ons. I think for the most part is most people are upset because they dont understand how to make a car accelerate. Key is knowing how to "free" a car up. My z06 is 3840 me in it and I run my AC the entire pass lol Good luck to you in your 500 rwhp quest as it is obtainable if your willing to put in the work around the engine too.