88 C4 Roller Cam?????
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 1,097
Likes: 2
From: Richfield Utah
88 C4 Roller Cam?????
I've checked around, and can't find the answere to this one. Does anybody know the advertised lift, and duration of the stock roller in my 88 C4? Now a 1.6 rocker ratio gives you 31/1000ths more lift, am I correct? What about a 1.7 ratio rocker? Sorry for being pesky, but I am very interested, as it will help me determine thee ole master plan. Many Thanks, Tom
Last edited by Steel Breeze; May 26, 2006 at 11:42 AM.
Advanced
Joined: Sep 2002
Posts: 60
Likes: 1
From: Syracuse NY
Re: 88 Corvette Cam Specs
Tom,
According to my 88 Corvette service manual the stock cam has .273 lobe lift on the intake and .282 lobe lift for the exhaust. Multiply this by 1.5 which is the stock rocker arm ratio and you get .409 for the intake (at the valve) and .423 for the exhaust. Just multiply the lobe lift by the rocker arm ratio to get the lift at the valve. Also the service manual does not specify the duration. Hope this helps.
Joe
According to my 88 Corvette service manual the stock cam has .273 lobe lift on the intake and .282 lobe lift for the exhaust. Multiply this by 1.5 which is the stock rocker arm ratio and you get .409 for the intake (at the valve) and .423 for the exhaust. Just multiply the lobe lift by the rocker arm ratio to get the lift at the valve. Also the service manual does not specify the duration. Hope this helps.
Joe
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Steel Breeze
Now a 1.6 rocker ratio gives you 31/1000ths more lift, am I correct? What about a 1.7 ratio rocker?
RACE ON!!!
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 1,097
Likes: 2
From: Richfield Utah
Originally Posted by JoePellacore
Tom,
According to my 88 Corvette service manual the stock cam has .273 lobe lift on the intake and .282 lobe lift for the exhaust. Multiply this by 1.5 which is the stock rocker arm ratio and you get .409 for the intake (at the valve) and .423 for the exhaust. Just multiply the lobe lift by the rocker arm ratio to get the lift at the valve. Also the service manual does not specify the duration. Hope this helps.
Joe
According to my 88 Corvette service manual the stock cam has .273 lobe lift on the intake and .282 lobe lift for the exhaust. Multiply this by 1.5 which is the stock rocker arm ratio and you get .409 for the intake (at the valve) and .423 for the exhaust. Just multiply the lobe lift by the rocker arm ratio to get the lift at the valve. Also the service manual does not specify the duration. Hope this helps.
Joe
Originally Posted by CFI-EFI
If you know that a 1.6:1 rocker ratio adds .031" lift over a 1.5:1 rocker arm, then you can figure the lobe lift of the cam, and the valve lift with any other ratio rocker arm.
RACE ON!!!
RACE ON!!!
Originally Posted by vader86
cam specs are on my website
