96Formula6spd

iTrader: (7)

Hey guys I am going to be putting my lt4 hotcam in my car in the next week or so. I had a question for the tune. What would you guys recommend for a red line. I was thinking around 6300. Would this be ok to run on a stock bottom end with 157k on it?

SPEEDYTRANSAM1996

iTrader: (37)

Perfect....

96Formula6spd

iTrader: (7)

Thanks I had looked around and I think thats what most people run

chevy2808

factory redline is 5700, so 6300 is higher than stock... but chance um if you like

94Z28rag

iTrader: (10)

6300 is fine. It's a bigger cam he needs to run it higher.

James Montigny

iTrader: (13)

The problem isn't so much the block as it is the rod bolts' ability to keep bearings under control.
The further you push beyond 6200, the more risk you run.
I shifted at 6375 for most of the 2007 season without issue, many have gone longer.
Bearings looked fine when I pulled it apart to build the 383.

If you decide to play with fire and push it towards 6500+, I suggest you have a
"build my new motor" fund ready.

meine96ws6

iTrader: (4)

i would keep it around there.. better being safe then sorry you know..

My95Z

iTrader: (8)

LT4's shifted at 6,300 from the factory and they are basically the same shortblock, but that was when new. As long as you have good oil pressure and don't leave at that rpm for long you should be fine.

gregrob

iTrader: (8)

Except they were 4 bolt mains

My95Z

iTrader: (8)

Yeah, the center 3 caps were, but the end 2 are still 2 bolt. LT1's hardly ever fail at the main bearing, its almost always at the rod bearing b/c of rod bolt stretch at high rpm.

ElkySS

iTrader: (6)

i know on ls1s you have to resize the bearings when you replace thr rod bolts with arp. do you have to do the same with LT1s or can i just replace them one at a time and torque them to specs?