BBC cam, and some other questions...
04-24-2008, 10:08 AM
#1
BBC cam, and some other questions... My brother is building a motor for my fathers 72 Chevelle. So far he's got the shortblock done. It's a mid 70s 454 block and crank, 2 bolt. It has stock resized rods and KB .030 over hyper pistons. Should be around 9.5:1 compression. Heads are a set of 781 castings that are completely stock for now. They'll be sent out to be cleaned, pressure check and a valve job done. I'm wanting to hear some suggestions on a cam shaft. It's a heavy *** car that probably won't be spun past 6k rpm, but we'd like it to have a nice lopey idle. Definately hydraulic, we'd consider a roller if it wasn't a big cost increase. Should we have a bigger set of valves installed while the heads are at the machine shop? If so, what size? The rest of the combo is as follows...
1972 Chevelle, close to 4,000lbs, M21 trans, good clutch, 12 bolt with 4.10s and a posi, 28" street tires, Performer dual plane, Holley 750 mechanical, hooker long tubes, 2.5" dual exhaust with flowmasters.
Just a fun pump gas street car, not looking to set the world on fire with it. Post up what cam you'd use in this motor, and please include the part number. Thanks in advance.
1972 Chevelle, close to 4,000lbs, M21 trans, good clutch, 12 bolt with 4.10s and a posi, 28" street tires, Performer dual plane, Holley 750 mechanical, hooker long tubes, 2.5" dual exhaust with flowmasters.
Just a fun pump gas street car, not looking to set the world on fire with it. Post up what cam you'd use in this motor, and please include the part number. Thanks in advance.
04-24-2008, 01:49 PM
#2
Teching In
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Nice cam for your application. We have one of these in a 4300 pound LWB truck running 13.50s with 3.73 gears ( 454 .030 over, 8.5 to 1 compression, 049 heads, small valves, 750 carb on a dual plane, turbo 400, 2500 rpm stall). Sounds good, runs hard.
Available at Summit.. Lunati 00024LK
Part Number: LUN-00024LK
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-5,500
Intake Duration at 050 inch Lift: 230
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 230 int./230 exh.
Advertised Intake Duration: 292
Advertised Exhaust Duration: 292
Advertised Duration: 292 int./292 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.544 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.544 in.
Valve Lift with Factory Rocker Arm Ratio: 0.544 int./0.544 exh. lift
Lobe Separation (degrees): 109
I would put 2.190 and 1.880 valves in those heads. It's reasonable cost with good gains in horsepower. http://competitionproducts.com/prodinfo.asp?number=8514
Available at Summit.. Lunati 00024LK
Part Number: LUN-00024LK
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-5,500
Intake Duration at 050 inch Lift: 230
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 230 int./230 exh.
Advertised Intake Duration: 292
Advertised Exhaust Duration: 292
Advertised Duration: 292 int./292 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.544 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.544 in.
Valve Lift with Factory Rocker Arm Ratio: 0.544 int./0.544 exh. lift
Lobe Separation (degrees): 109
I would put 2.190 and 1.880 valves in those heads. It's reasonable cost with good gains in horsepower. http://competitionproducts.com/prodinfo.asp?number=8514
