Hello all. I'm new to the site but not to Chevelles. I have owned my 1969 SS396 for 22 years since I was 16. I'm looking for suggestions from any of you engine builder out there.
Let me give you some info on the car. It has 3.73 gears, TCI TH400 with a B&M Holeshot 3000 and it stalls to 3600 in my car. The engine is a 4.250 bore 454 with 12.25:1 CR, Edelbrock Performer RPM rect. port heads P/N 60559, Comp Cams solid roller (specs below), Victor Jr, and a 950 Holley built by The Carb Shop. The car dyno'd 461 rwhp and 462 rwtq and has run a best 11.11 @ 121 on a 50/50 mix of VP110 and 91 pump gas.
I have a second 454 that I'm going to build and have two goals. One, I want to be able to run the car on 91 pump gas without having to use race fuel. The second is I would like to get the car into the 10.50 range without changing anything else on the car.
My question is can this be done with a 454 with say 10.5:1 CR and a bigger cam? Or should I build a 496 with a bigger cam?
Any suggestions from the experts?
Here's the cam:
COMP Cams
Product Line: COMP Cams Magnum Solid Roller Camshafts
Part Type: Camshafts
Part Number: CCA-11-692-8
Cam Style: Mechanical roller tappet
Basic Operating RPM Range: 2,200-6,500
Intake Duration at 050 inch Lift: 246
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 246 int./246 exh.
Advertised Intake Duration: 288
Advertised Exhaust Duration: 288
Advertised Duration: 288 int./288 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.622 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.622 in.
Valve Lift with Factory Rocker Arm Ratio: 0.622 int./0.622 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash: 0.020 in.
Exhaust Valve Lash: 0.020 in.
Computer Controlled Compatible: No
Grind Number: CB 288A-R10
Let me give you some info on the car. It has 3.73 gears, TCI TH400 with a B&M Holeshot 3000 and it stalls to 3600 in my car. The engine is a 4.250 bore 454 with 12.25:1 CR, Edelbrock Performer RPM rect. port heads P/N 60559, Comp Cams solid roller (specs below), Victor Jr, and a 950 Holley built by The Carb Shop. The car dyno'd 461 rwhp and 462 rwtq and has run a best 11.11 @ 121 on a 50/50 mix of VP110 and 91 pump gas.
I have a second 454 that I'm going to build and have two goals. One, I want to be able to run the car on 91 pump gas without having to use race fuel. The second is I would like to get the car into the 10.50 range without changing anything else on the car.
My question is can this be done with a 454 with say 10.5:1 CR and a bigger cam? Or should I build a 496 with a bigger cam?
Any suggestions from the experts?
Here's the cam:
COMP Cams
Product Line: COMP Cams Magnum Solid Roller Camshafts
Part Type: Camshafts
Part Number: CCA-11-692-8
Cam Style: Mechanical roller tappet
Basic Operating RPM Range: 2,200-6,500
Intake Duration at 050 inch Lift: 246
Exhaust Duration at 050 inch Lift: 246
Duration at 050 inch Lift: 246 int./246 exh.
Advertised Intake Duration: 288
Advertised Exhaust Duration: 288
Advertised Duration: 288 int./288 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.622 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.622 in.
Valve Lift with Factory Rocker Arm Ratio: 0.622 int./0.622 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash: 0.020 in.
Exhaust Valve Lash: 0.020 in.
Computer Controlled Compatible: No
Grind Number: CB 288A-R10
