Engine pro question
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 945
Likes: 0
From: Ventura California
Engine pro question
I'm gonna be building my 350 for the Corvette soon but I have a question in regards to vacuum. I'm concerned that my combo may not produce enough throughout the range for the headlights. Here's what I'm doing-
Comp Cams XR-282 hydraulic roller cam
Operating Range: 2200-5800 RPM
Duration Advertised: 282° Intake / 288° Exhaust
Duration @ .050'' Lift: 230° Intake / 236° Exhaust
Valve Lift w/1.5 Rockers: .510'' Intake / .520'' Exhaust
Lobe Separation Angle: 110°
Jegs Aluminum 64 cc head 197 cc runners
10.3 - 1 static comp ratio
8.27 - 1 dynamic comp ratio
Standard stroke Scat Forged and lightened crankshaft
Dual plane intake (prob Edelbrock).
Any thoughts as to the vacuum? I want to be sure that my headlights will work ok.
Comp Cams XR-282 hydraulic roller cam
Operating Range: 2200-5800 RPM
Duration Advertised: 282° Intake / 288° Exhaust
Duration @ .050'' Lift: 230° Intake / 236° Exhaust
Valve Lift w/1.5 Rockers: .510'' Intake / .520'' Exhaust
Lobe Separation Angle: 110°
Jegs Aluminum 64 cc head 197 cc runners
10.3 - 1 static comp ratio
8.27 - 1 dynamic comp ratio
Standard stroke Scat Forged and lightened crankshaft
Dual plane intake (prob Edelbrock).
Any thoughts as to the vacuum? I want to be sure that my headlights will work ok.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
No problem with vacuum. I run a cam with 252/260 @ .050 and it has plenty of vacuum to run the headlights. 230/236 is not a lot of duration. Your vacuum at idle should be fine. I run about 8 to 9 inches at 1000 rpm and it raises the lights fine.
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 945
Likes: 0
From: Ventura California
