ss performance

iTrader: (17)

I'm doing a H/C/I the cam has a 3500-7200 rpm range.

I'm trying to figure out the max RPM my stock bottom end can handle.

I planning to send the ECU out to be tuned and I need to know what RPM to set the shift points.

Cam spec is Inkate .605 lift 238@050
Exhaust .610 lift 242@.050
LSA 112
Heads TrickFlow 215 CNC
Intake FAST 92/102
Throttle Boby 92mm
Kooks 1-3/4 long tube

I havent decided on the TC stall yet most likely 3600-4000

3.90: rear gears

My LS1 has about 105K miles on it.

luigiandme

iTrader: (2)

It can handle 7000 easily. But I bet your cam falls on it's face right at 6800 if not earlier. Have your tuner tune it, and be done with it. It makes power where it makes power and doesnt make power where it doesnt.

outkast6991

iTrader: (34)

What year short block also plays a roll in it. With 105k on it just know going in there is some risk involved just due to the mileage.

Tainted

iTrader: (9)

I dont know about easily....

Those rod bolts are ticking time bomb. Replace those and I think you could spin to 6800 quite a few times. Plenty spin higher, but these are stock rods, they really werent designed for this per say.

JustAFooL

iTrader: (45)

:word:

My tuner tells me that my cam loves 6800 but my bottom end hates it. It pulls to there so that's where I spin it to. I know that I'm on borrowed time though and try not to take advantage of t often.

Killer5.3

iTrader: (1)

it can be a crap shoot spinning one over 6600-6700 especially with some miles on it. If it is 01-02 then it has the LS6 rodbolts which are stronger. I would highly recommend putting a new LS2 timing chain and gears, melling high volume oil pump , and make 100% sure that you keep the oil always topped off. I run 1/2 qt extra in mine. We spin our 02 with 22,000 to 7000 on motor regularly and have spun it to 7300-7400 on 200 shot. We have the same cam as you. Most of the failure I have seen or heard about are spun bearings more than broken rods or rod bolts. Spun bearings are caused by not enough oil to the bearings at high rpm. I like to run the 1/2 qt extra oil because the high volume pumps can starve of oil because of the higher pressure and volume with a stock pan.

ss performance

iTrader: (17)

Mine is an 02 B4C (police package) since I am taking the timing cover off I am replacing the timing chain (LS2) and the oil pump. I was going to use the a stock pump, should I use the high volume?

How can I determine the RPM range of my cam. I looked up on Comp's web site and found one with the same duration and LSA the lift was just a little less and it advertises 3500-7200 which is where i came up with my RPM range.

Thanks

outkast6991

iTrader: (34)

intake will play a roll as well in the rpm range

Tainted

iTrader: (9)

you want high pressure not volume, you could suck your pan dry.

There is no need for you to spin that high man. its just putting that much stress on your bottom end.

heres something else you should think about too, your rockers. Those things are going to puke needle bearings everywhere after some of these high rpm runs, you need to get the trunion upgrade.

Killer5.3

iTrader: (1)

The intake will probbaly keep the peak around 6400 ish. You have the same cam we do and ours picked up 3 tenths moving the shift point up from 6500 to 7000. if you don't want to spin your motor that high then put a smaller cam in it. If you are going to put that cam in then I would go with 4.10 gear and 4000 converter and shift it at 6800 at least or you are leaving alot of et on the table.

ss performance

iTrader: (17)

The intake is a FAST 92/102 with a 92mm TB. Will this intake limit the RPM range? I thought it flowed pretty good.

I'm using Harlad Sharp roller rockers

Tainted

iTrader: (9)

it flows good, but youre still asking a lot from a stock bottom end.

Alex L.

iTrader: (16)

I've spun to 7400 plenty. Have to change valvesprings often. Once a rocker unscrewed itself but other then that it's been ok. High milage ls1.

Killer5.3

iTrader: (1)

Fast is not going to peak much higher if any. It is still similar to stock intake as far as runner length which is limiting factor. It will just make more power in same rpm range on the right combo as LS6 intake. Bottom line is that cam should peak in the 6400-6500 range regardless of ls6 or fast and should be shifted 400-600 rpm higher for maximum results or shift it lower and leave et on the table or put a smaller cam in it and shift it lower.

Marc 85Z28

iTrader: (8)

Yeah, that's completely WRONG.

For reference, my 239/242 peaked at 6400rpm with the LS6, and peaked at 6800rpm with a FAST 92. That is typical.

Killer5.3

iTrader: (1)

It peaked at 6800 or did it carry out to 6800?