I need a PRO'S opinion!!!
Thread Starter
Advanced
Joined: Apr 2010
Posts: 85
Likes: 0
From: Garden City Michigan
I need a PRO'S opinion!!!
Hi, i was told my set up i am about to install would not work and i dont know if im just being jerked around.. i was talking to a guy at a local shop and he said the the parts i have wouldent work with eachother. and he was trying to get me to buy a different springs! so if someone could help me out it would be appreciated. Thank you!
here's what i am installing.
Crane Gold 1.7 rocker's
Pac 1218 springs= 600. lift
Comp cam XFI RPM XR265HR cam= 212/218 .522-I .529-E 114 LSA
here's what i am installing.
Crane Gold 1.7 rocker's
Pac 1218 springs= 600. lift
Comp cam XFI RPM XR265HR cam= 212/218 .522-I .529-E 114 LSA
Last edited by luc719; Apr 9, 2011 at 03:21 PM.
Melting Slicks
Joined: Mar 2005
Posts: 2,252
Likes: 181
From: NE OH
I'm not a pro, but I'll take a stab...
I believe cam lift specs are obtained with 1.5 rockers. Looking at the .529 exhaust spec and the 1.7 rockers, I come up with .634 max lift. If your springs are rated for .6 lift, one of the 3 (cam, springs, rockers) need to be changed.
I believe cam lift specs are obtained with 1.5 rockers. Looking at the .529 exhaust spec and the 1.7 rockers, I come up with .634 max lift. If your springs are rated for .6 lift, one of the 3 (cam, springs, rockers) need to be changed.
Intermediate
Joined: Dec 2002
Posts: 46
Likes: 0
From: Tremec AZ
LS1 Gen III stock rockers are 1.7 (Gen I & II are 1.5)
I don't see a problem with those parts.
The best contact before install is the cam company.
I don't see a problem with those parts.
The best contact before install is the cam company.
Last edited by ChevyEFI; Apr 10, 2011 at 05:12 PM.
Burning Brakes
Joined: Jun 2009
Posts: 1,022
Likes: 0
From: Concord NC
St. Jude Donor '10
Cams for LS engines are rated using factory 1.7 rockers. That is a TINY cam for one of these engines, very close in size to an LS6 cam, you'll be picking up minimal gains at best with it. I'd reconsider your cam choice and go for something slightly larger. There are plenty of more aggressive cams that people are very happy with that retain near stock driveability. Many of the large LS parts houses sell 224 and 228 deg cams that many people are very happy with.
Those springs should be more than enough for that cam. The rockers will add some nose weight but I'm guessing you aren't planning on turning it up very high with that cute cam, in which case it will be fine. The rockers are completely unnecessary and aren't likely to yield gains, especially at that low of lift.
Those springs should be more than enough for that cam. The rockers will add some nose weight but I'm guessing you aren't planning on turning it up very high with that cute cam, in which case it will be fine. The rockers are completely unnecessary and aren't likely to yield gains, especially at that low of lift.
Last edited by mAydAy121; Apr 10, 2011 at 12:52 AM.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I would shoot for 135# on the seat, maybe 140#. I would also run the numbers to see how much coil clearance you have. This setup should work, properly set up.
Do you have the full Crane kit?
Do you have the full Crane kit?
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
just throwing this out there... i know tons of people who DD much bigger cams than that in a 4.8
it wouldn't really be worth your time to swap to something that small, especially in an engine this size
it wouldn't really be worth your time to swap to something that small, especially in an engine this size
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Team Owner
Joined: May 2005
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From: Flagstaff Az.
Thread Starter
Advanced
Joined: Apr 2010
Posts: 85
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From: Garden City Michigan
Yes, i got the full kit. and i didnt go to big with the cam because i am never at the track, and i just want a little more play for the red lights lol
Burning Brakes
Joined: Oct 2004
Posts: 931
Likes: 35
From: Rowlett, Texas
I've had that cam for about 7 years now, with Comp 915 springs and stock rockers. Upgraded rockers or stronger springs are certainly not needed for durability with the lower lift. If you don't plan to add headers, this cam is one of the best for a wide torque band. You will gain about 30 lb ft and 30 HP with no other mods, and improved driveability over stock.
