gcarter
05-23-2007, 07:05 PM
The new (to me) '88 Testarossa, as I purchased it, has a pretty radical cam that would probably be better suited to drag racing rather than a boat.
Additionally, it also came w/a nice set of Gil exhaust manifolds and LOOOOOONG risers and tail pipes that extend all the way through the transom. These tail pipes are water jacketed, but the exhaust is dry all the way to the end. See the 1st pic.
I have purchased a Comp cam #11-240-4, see spread sheet for card info.
Camshaft Specification Table
Part Number 11-240-4
Engine 1965-1996 Chevrolet
396ci-454ci
8cyl.
Grind Number CB XM 278H-12
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.564 0.567
Duration At 0.006 Tappet Lift 278 292
Valve Timing At 0.006
Open Close
Intake 29 69
Exhaust 80 32
These Specs Are For The Cam Installed At 110 Intake CL
Intake Exhaust
Duration At 0.05 234 244
Lobe Lift 0.332 0.334
Lobe Separation 112
Recommended Valve Springs 924-16
My desire is to remove the dry risers, replace them w/shorter wet risers so some sort of switchable exhaust can be installed. See pic 2.
My question is;
Can the new Comp cam be safely used with wet exhaust? Or should a different cam be used to accomplish the exhaust switch?????
I already have received some advice that the risers are too short to prevent reversion.
Thanks in advance
Additionally, it also came w/a nice set of Gil exhaust manifolds and LOOOOOONG risers and tail pipes that extend all the way through the transom. These tail pipes are water jacketed, but the exhaust is dry all the way to the end. See the 1st pic.
I have purchased a Comp cam #11-240-4, see spread sheet for card info.
Camshaft Specification Table
Part Number 11-240-4
Engine 1965-1996 Chevrolet
396ci-454ci
8cyl.
Grind Number CB XM 278H-12
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.564 0.567
Duration At 0.006 Tappet Lift 278 292
Valve Timing At 0.006
Open Close
Intake 29 69
Exhaust 80 32
These Specs Are For The Cam Installed At 110 Intake CL
Intake Exhaust
Duration At 0.05 234 244
Lobe Lift 0.332 0.334
Lobe Separation 112
Recommended Valve Springs 924-16
My desire is to remove the dry risers, replace them w/shorter wet risers so some sort of switchable exhaust can be installed. See pic 2.
My question is;
Can the new Comp cam be safely used with wet exhaust? Or should a different cam be used to accomplish the exhaust switch?????
I already have received some advice that the risers are too short to prevent reversion.
Thanks in advance