lol, I was referring to doing heads, not headers... I know how easy headers are, already did the edelbrocks.

 

Ahhh Sooo said the blindman

 

Wow, much worse than I had guessed even. However, a .006 to .050 rate of 85 degrees will do that.

and thanks for the specs, Patrick. I wouldn't guess the '01+ LS1 cam is measurably better, or do the 2* shorter intake duration and narrower LSA help much?

 

Ok, my plans just changed, hopefully for the better. I just purchased a set of used heads from a member on here that aren't ideal for my combination, but I know they'll work a hell of a lot better than my stock '98 heads. They're patriot stage 3 LS6 style heads with 2.08/1.60 valves. Granted, on a stock LS1 bore the valves are going to be shrouded and this will cut down on flow a bit, but I don't think it will be that significant. I'm looking more at the fact that I can get the heads and have them rebuilt for under $500. From what I've gathered on these heads, they're about 1CC bigger in the chamber than my stock heads, so a slight mill job is probably in order. Using my cam specs from before, LSK lobes 220/224@.050 .632/.636 lift 108+0 LSA, how well will these heads perform? Will I need to flycut with such a short duration? Or will it be a necessity due to the 2.08 intake valve? Any ideas/opinions would be much appreciated.

 

The 2.08 valve will make your P to V clearance tighter, especially with a proper mill job. But with only 220 duration, you should be in good shape.

 

So will this combination make enough power to get me into the 11's? I'm guessing by the flow numbers and cam specs that it should put down around 420 HP at the wheels. Not sure whether that's enough to get into the 11's or not. I'll be adding LT's and an LS6 intake to compliment the heads/cam package as well.

 

So much of that depends on driver with an M6 and you're 60 ft. 420 is PLENTY to get into the 11's it's just hooking up that's difficult. I have 431hp, did a 1.91 60ft , ran a 12.1@118. Obviously by my trap speed it's an 11 second car but I can't seem to bust into them yet. I need more work on the !driver mod, like losing some weight!!

 

If you can not make into the 11s do the driver mod and it will get there..

 

Yeah, but I gotta be very nice to my weak little rear axle until I can replace it with something beefier. I'd be in the 12's already if I ever could have launched it above 2500 RPM and not blew the guts out of it 3 times.

 

ok i've been reading and reading and here is what i came up with. 228/236 639/646 110 i'm getting parts together to build a 383. i'm getting 383 kit with 3.905" pistons 4" stroke and it said 6.2" rods. useing 317 heads with .042 head gaskets. and truck intake manifold (for now probably ls6 or such later) long tube pace setter headers 1.75" primaries. 3" exhaust. this is going in the tahoe.

thoughts?

 

This will make for an outstanding cam in a heavy SUV. You'll have excellent torque down low, high DCR, and the overlap is not excessive. Looks like something I would recommend.

 

sweet thanks. looks like i've been learning something after all lol.

 

would 4.8T's suggested came be good for an F-Body? I'm looking for an all around street car, so part throttle and mid range WOT throttle performance is also important to me. mods in sig clutch on the way.
Thanks
AJ

 

damn this thread is long.

 

Here it goes again... changed plans. Patrick, I am purchasing a cam almost identical to yours from a member on here. The only difference is it's ground on a 111+0 LCA instead of a 110+0. I sold the stage 3 heads, as the chambers would need excessive milling to get to the correct volume and the intake ports were too large to use on my stock cube engine. My plan is now to purchase a set of Patriot Stage 1 LS6 heads and use a Cometic .040 head gasket. Knowing that this cam can pull well past the RPM range I have chosen for my engine (6300-6400 max) , I've decided to use an adjustable timing set and advance the cam to bring the powerband down a bit and to raise my DCR. My questions are A) How many degrees do I need to advance the cam to get the powerband where I want it? B) What SCR should I be shooting for using that advance figure? What CC should the heads be to achieve this? They are 64cc unmilled. Also, I am guessing with such short seat time I shouldn't run into any PTV clearance issues, but I can't recall what effect advancing the cam has on PTV clearance. I know it gives you more on one lobe and less on the other, just not sure which. Thanks for the info in advance.

 

I think 1 degree advanced would be fine and would perfectly center your 4 degrees of overlap. You can go 2 degrees if you even want to boost torque more.

According to PianoProdigy's DCR spreadsheet...a .040 headgasket and 63cc chambers would get you 8.76:1 DCR with the +1....and the +2 with 63.5cc chambers will get you 8.77:1 DCR.

Hammer

 

Yes it is but its a gooooooooood one ...

 

If it were me, I would mill the heads to yield a 61cc chamber size, run the .040" gasket and advance that cam 2 degrees. Keep in mind, the calculator you're using for DCR thinks that the lobes have a 49 degree ramp rate when in reality, they're closer to 51 degrees. Actual DCR will be lower than calculated DCR. Your's should be around 8.7ish:1 DCR after it's installed (right where you want to be).

 

I sold my z28 that had a 228/232 .588/.595 on 110+2. Now I drive an 02 Z06, and I am kinda wishing I had taken that cam out before I sold it. Then again I love the Z06 as is, but I always want more power. A 224/228 .581/.588 on 110+2 came up with 8.51 dcr? That is around the limit for 91 octane though right? I live in OK and all we have is 91 So i was thinking 110 straight up would be safer, and I would assume the power band would end about where stock does, maybe a little higher with no advance? I dd my car and it is street only, maybe autox or 1/4 couple times a year so not worried about that. I would think that the smaller cam should have plenty torque to keep it driving nicely, though most vette people seem to love big cams like g5x3... Any help greatly appreciated. I have learned a ton from u cam gurus: patrick, predator, jrod

just saw fm14 high lift 232/234 .646/.612 on 112 made 435/417 cam only in 01 z06

 

Yes, using the specs you gave me netted me a 9.09 DCR using Pianoprodigy's calculator, so what you said seems right on the money, given the difference in ramp rates. Is 8.7 going to be too high for 91-92 octane? 92 is about max for this area. Don't see 93 very often. If so, dropping back to a 62CC chamber should give me a bit of a cushion. Either that, or get a 61CC chamber and polish it which should lower the chances of detonation.