Free Bird

iTrader: (1)

I was thinking of something in the 230 to 240 durration. I have the ZZ4 cam now w/ 1.6RR. I can't go over .600 lift. My springs won't take it. I don't want the LT4 HC b/c I would get less lift then I got now.

I also would like to stay hydrolic roller

I do spray an occasional 100-125 shot.

I want it to rev to 6000-6500max.

Am I in the ball park conserning the durration? I don't mind a VERY lopy idle. This is my daily driver, but I'm only 10min. away from work. I plan on getting into prom burning VERY soon. I know I should've started that when the car was stock. All replies are welcome.

Thanks a lot.

GofasterFirebird

iTrader: (3)

1. How fast is your car?
2. The LT4 hot cam will have more lift on the intake and less on the exhaust.
3. You have ZZ4 heads, .600 lift will not help.
4. Learn to burn proms, before you buy a cam. But you know that
5. I believe the Hot cam should be in your car. 230 240 will need a larger stall, gears

TPI Guy

Buy the HOT Cam! Your heads reach maximum velocity at well below .5". You need more duration 218/228 has a little lope, is streetable, and it's cheap! The big split pattern will work well with the nitrous also. Use it! Use it!

Your redline is going to be limited by your heads at this point. You should look into getting some headwork done.

tpi_roc

redline is limited by the lifters and valve train



Heads determin where max hp/tq will be (in conjunction with the cam)

Chris Etemadi

I am in the same boat. Im building a 355 with an LT1 intake, ported L98 heads, 10.3:1 comp etc...

I have been Looking around on LT1 boards (at camaroZ28.com) here are a few:

Comp Cams "305" LT1 Camshaft, 220 / 230, .510 / .510 114 LSA
Good all around streetable cam (good vacum and idle.
many cars running mid 12's some low 12s and even high 11's N/A.
(What Im leaning towards)

Comp Cams "306" LT1 Camshaft, 230 / 244, .510 / .549 112 LSA
Strong upper RPM cam. not very "streetable" (every person has their own def. of streetable) high stall or manual trans.
(most popular "hardcore" grind on Camaroz28.com

Crane LT1 Camshaft, 210 / 224, .479 / .518 112 LSA
A few people I know have ran this. and they say it is VERY strong midrange. a couple people claim high-mid 11's with minimal work (exhaust lift and duration help with stock lower exhaust flowing heads.)

and the good ol' Hot cam (everyone knows the stats and comments just about.)

Figures are with 1.5 ratio rockers. and duration at .50"

tpi_roc

Thank G0D for the Cesspool of knowledge at camaroz28.com

Chris Etemadi

Well its one of the largest LT1 forums I have seen. And they should know what runs best for the short, detuned runnner length of the LT1 intake.
I think the best way to pick something to use is to see how others like it, and what it is doing for them.
Kinda like learing from someones mistakes.
What are your suggestions?

tpi_roc

I certainly commend your effort, your research is in the right direction... However keep in mind the vast differences in the two computers.

If you're doing an LT1 intake swap, and they're running full LT1's, they have many advantages and things to consider over you. Reverse cooling, much much better head design, (opti spark which isn't necissarily good) and the ECM. After 93 they went to maf & map systems, I imagine this leaves a little extra room for lope.


Make sure you consider all the variables.


Also you may want to consider the fact that comp will grind any grind you want for you for a few extra bucks. I'd get the max lift you can go, 112 duration, and about 225-235 duration. Thats going to be a fairly high RPM cam, and you can street it with about a 2,600 stall and some 3.42-3.73's (depending on tranny)


If you go to a 114 LSA you can go more duration, but 112 will offer a sharper HP peak

Chris Etemadi

Thanks man, I guess I will give Comp a call (do you know how much extra it would be to have them custom grind one?)
I was thinking if they could get the 305 grind in a 112 LSA and alittle more duration like you said somthing like 225 in 235 ex (to help out with the exhaust) is duration, lift, and LSA all the specs you have to provide them?

tpi_roc

They might ask you what lobe profile you want, those are bassed on their own "deffinitions" I believe the custom grind was $60 over a base cam. That $60 is very well spent if you can't find a cam to suit your combo and you custom grind one (like a super built tpi, tons of lift, yet small duration) cams like that are hard to find. Anywho look through their catalog, or maybe talk to the phone rep for what lobe profiles are what.

Chris Etemadi

opps