Cam Question...

Reply Subscribe

Thread Tools

Search this Thread

Jun 1, 2009 | 07:32 PM

sparky77

Thread Starter

Teching In

iTrader: (1)

Joined: Jun 2008

Posts: 4

Likes: 0

Cam Question...

What is the maximum lift that stock heads on a 99 LS1 can handle? I bought a comp cam xr275hr-12 and have it installed...but I'm nervous about the stock valve train. The lift is .566 intake and .568 exhaust...and 222 duration.
Can anyone help me out?

Thanks

Jun 1, 2009 | 07:35 PM

fccs

12 Second Club

iTrader: (26)

Joined: Feb 2007

Posts: 2,373

Likes: 3

From: PA

Heads? lol alot more then that, a 5xx intake and exhaust lift is nothing. People are running cams with mid 6xx's like the ms4 and trex's on stock heads buddy!

Jun 1, 2009 | 07:39 PM

sparky77

Thread Starter

Teching In

iTrader: (1)

Joined: Jun 2008

Posts: 4

Likes: 0

Thanks, a buddy said they could only handle a .55 lift, which didn't sound right.

Jun 1, 2009 | 07:43 PM

fccs

12 Second Club

iTrader: (26)

Joined: Feb 2007

Posts: 2,373

Likes: 3

From: PA

Quote:

Originally Posted by sparky77

Thanks, a buddy said they could only handle a .55 lift, which didn't sound right.

Yea if your buddy is saying that, then I wouldn't listen to him for anything about your car..lol. I have a 228r cam which is considered "SMALL" compared to other cams, and the lift is .588/.588 on it. I've seen people run huge cams or even custom ones with lifts up to like .635/.640 on stock heads fine. The big cams like trex,ms4,polluter, tsp giant, are all over .620's easy and people daily drive those cams with stock setups even.