Cam Change info HELP
Thread Starter
Pro
Joined: Dec 1999
Posts: 673
Likes: 0
From: Venetia,Pa,USA
Cam Change info HELP
I think I got over my head and need some important info. I last season was running a stock ZZ4 crate engine in my Race prepared C4 with NASA. I wanted to increase the performance for next year, SOOOOO I ordered a Super Ram intake and a name brand Cam [$309]. I told the cam supplier that I wanted to also use 1.6 roller rockers. I assumed that they would only sell me a cam that would work. I'm now not so sure. The cam has a intake lift of 0.576 and a exhaust of 0.571. Will I have enough clearence between pistons and valves with 1.6 rockers and if not will I have enough clearnce with the stock 1.5 rockers????
I can be E Mailed direct if you wish at orawiecs33@adelphia.net
ALL INFOR MUCH APPRECIATED
I can be E Mailed direct if you wish at orawiecs33@adelphia.net
ALL INFOR MUCH APPRECIATED
Racer
Joined: Apr 2003
Posts: 426
Likes: 0
From: Detroit MI
Acording to this post http://forums.corvetteforum.com/show...ng&forum_id=48
Your springs in the head won't take more than .525 .
Your springs in the head won't take more than .525 .
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 0
From: High Plains Drifter Fayetteville, AR
Originally Posted by The Bus
The cam has a intake lift of 0.576 and a exhaust of 0.571. ALL INFOR MUCH APPRECIATED
Is that spec for a 1.5 or 1.6 rocker? If it's for a 1.5 rocker your lift would be .614 and .609 with a 1.6 rocker. You'll need some HEFTY springs for that much lift.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
As above , I believe the spring are going to be youir biggest worry.
Seem to remember others have run .600+ lift with no clearance problem.
The Comp Cams '918 beehive spring seem to be the spring of choice for .600+ lift, fits stock head without machining.
Seem to remember others have run .600+ lift with no clearance problem.
The Comp Cams '918 beehive spring seem to be the spring of choice for .600+ lift, fits stock head without machining.
Melting Slicks
Joined: Mar 2004
Posts: 2,141
Likes: 2
From: Pittsburgh Pa
i have that cam... xfi280hr-13 its .576 with 1.6 rockers....its a wicked cam.. i have afr's and got some 8015 springs from afr... i am running kb flattop forged pistons with the two valve reliefs without problems. the reliefs on my pistons are cut kinda deep. so i don't know how well they would work with a regular flattop.
Last edited by pr0zac; Nov 21, 2005 at 10:58 PM.
Thread Starter
Pro
Joined: Dec 1999
Posts: 673
Likes: 0
From: Venetia,Pa,USA
I found out that 0.575 is the lift with the 1.6 roller rockers. Got a education since buying this cam. Would be happy if anyone chimes in with additional infor. Am in the process of tearing down. Also installing a Super Ram. Anyone have a guess to how much HP will be added.
Thanks to all who replied
Thanks to all who replied
