Tick 229/244 results (idle/dyno)

[LEO1LE]

Originally Posted by davidcroft

I see you're here in Houston...cool. Are you gonna make it to Mustangs vs Camaros this Sunday @ Fudruckers in the Woodlands?

I can't say for sure but I'll try and make it out. Hope to catch up with some more Camaro5 members out there.

[KaBoom1701]

I approve!

[GR8WHITE1]

Originally Posted by joelster

Stock LS3 heads can move enough air to easily feed a 600hp N/A engine. Money wasted in my opinion.

As I do agree with you the only way you are making that power n/a with stock heads is on a high compression stroker build. For someone like me that isnt willing to split apart the bottom end until I blow it these heads offer the last "bolt on bang for your buck" unless your willing to build the bottom end. After the heads the only option is FI or high compression stroker build and both of which IMO would both see nice gains from these heads without your wallet throwing up in your pocket.:p

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[GR8WHITE1]

Originally Posted by t&t moyer

I was thinking about going with the GMPP CNC Ported LS3 heads too but after lots of reading I am going to skip. They are not "expensive" but there's not much to gain either. I think if you're at that price point go to TSP and go for the PRC ported LS3 heads for a little more money.

One thing you aren't seeing is the TSP ported heads don't come with hollow intake valves, if you want them add $350 so now your at $2000.00 for the ported heads and $1200.00 for the gmpp heads so now that we're talking apples to apples how much better are the TSP ported heads? $800 better? Not for me IMO.

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[joelster]

I would love to see an apples-to-apples comparison of the OP's cammed LS3 as it sits right now, and then a cylinder head swap to whatever flavor you want. I doubt it would pick up 5hp. Stock LS3 heads are incredible pieces.

[t&t moyer]

Originally Posted by joelster

I would love to see an apples-to-apples comparison of the OP's cammed LS3 as it sits right now, and then a cylinder head swap to whatever flavor you want. I doubt it would pick up 5hp. Stock LS3 heads are incredible pieces.

So for the guys staying N/A pulling 500+rwhp on their 376 stock bottom end (no stroker kits) and had previously hit a plateau in the 465-475rwhp range where do you suppose the extra hp came from to get over the 500 mark?

[LEO1LE]

Originally Posted by joelster

I would love to see an apples-to-apples comparison of the OP's cammed LS3 as it sits right now, and then a cylinder head swap to whatever flavor you want. I doubt it would pick up 5hp. Stock LS3 heads are incredible pieces.

Not a LS3 comparison, but I owned a C6 Z06 that was a cam and bolt-on car, and had a friend with identical mods and cam but including a set of ported LS7 heads ans he consistently made 30 rwhp more than me. I believe there are gains to be made with milled/ported cylinder heads even with the LS3 heads. What I like about a good heads/cam car is that they typically pick up power over the entire rpm range and you can feel the difference, but the down side is you are paying quite a bit of money for labor and parts to pick up 20-40 rwhp.

[t&t moyer]

Originally Posted by LEO1LE

Not a LS3 comparison, but I owned a C6 Z06 that was a cam and bolt-on car, and had a friend with identical mods and cam but including a set of ported LS7 heads ans he consistently made 30 rwhp more than me. I believe there are gains to be made with milled/ported cylinder heads even with the LS3 heads. What I like about a good heads/cam car is that they typically pick up power over the entire rpm range and you can feel the difference, but the down side is you are paying quite a bit of money for labor and parts to pick up 20-40 rwhp.

Exactly my point. The only exception is that not all cnc / ported LS3 heads are created equal is all I was saying. Read all you can, research the alternatives and see what you can find. It really can be a tough choice.

[joelster]

Originally Posted by t&t moyer

So for the guys staying N/A pulling 500+rwhp on their 376 stock bottom end (no stroker kits) and had previously hit a plateau in the 465-475rwhp range where do you suppose the extra hp came from to get over the 500 mark?

Ok, so spend $2000 on heads to get 25hp. When I said 600hp, I was talking flywheel, not rear wheel. The heads flow around 350cfm, bone stock. That is easily enough to feed 600hp, without touching them. I don't know all of the internals of an LS3 as far as p-to-v clearance with a big cam. A different set of heads with a better valve job can increase the p-to-v depending on where the valve is in the seat. That could be the problem right there.

My point was that the heads should be the last thing you touch, they are far more capable, than the intake, exhaust, etc.

I bet if you notched the pistons (if possible) on a stock LS3 and got a cam around 240/250 to fit in there, you'd see 600 flywheel with all of the bolt-ons of course.

[GR8WHITE1]

Originally Posted by joelster

Ok, so spend $2000 on heads to get 25hp. When I said 600hp, I was talking flywheel, not rear wheel. The heads flow around 350cfm, bone stock. That is easily enough to feed 600hp, without touching them. I don't know all of the internals of an LS3 as far as p-to-v clearance with a big cam. A different set of heads with a better valve job can increase the p-to-v depending on where the valve is in the seat. That could be the problem right there.

My point was that the heads should be the last thing you touch, they are far more capable, than the intake, exhaust, etc.

I bet if you notched the pistons (if possible) on a stock LS3 and got a cam around 240/250 to fit in there, you'd see 600 flywheel with all of the bolt-ons of course.

My point is I plan to buy the gmpp cnc heads for $1190 then sell the stocks for $500 and your only into them for $690. For me it's worth 20-30hp for $690. Hell people buy $400 underdrive pulleys that make 8hp. And later when I do a stroker it will help it breathe even better.

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[t&t moyer]

Originally Posted by GR8WHITE1

My point is I plan to buy the gmpp cnc heads for $1190 then sell the stocks for $500 and your only into them for $690. For me it's worth 20-30hp for $690. Hell people buy $400 underdrive pulleys that make 8hp. And later when I do a stroker it will help it breathe even better.

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Don't forget with the GMPP CNC heads to factor in a set of valve springs as the ones supplied are only rated for cams up to .550" lift. Otherwise I'm interested to see how things go.

[GR8WHITE1]

Originally Posted by t&t moyer

Don't forget with the GMPP CNC heads to factor in a set of valve springs as the ones supplied are only rated for cams up to .550" lift. Otherwise I'm interested to see how things go.

Yeah I will get the springs in a kit with my cam. I will need springs regardless if I do heads or not with a new cam.

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[1977and2010]

I did the Gmpp ported heads on mine and gained 24 rwhp with no other changes. I don't see the aftermarket heads making that much more for the money. I didn't get the heads out of an want for more power but I dropped a valve from a broken spring and he'd to replace them. They were only 200 or so more than stock replacement heads.

[GR8WHITE1]

Originally Posted by 1977and2010

I did the Gmpp ported heads on mine and gained 24 rwhp with no other changes. I don't see the aftermarket heads making that much more for the money. I didn't get the heads out of an want for more power but I dropped a valve from a broken spring and he'd to replace them. They were only 200 or so more than stock replacement heads.

Any mods done or stock with those heads slapped on?

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