I have 2 cam choices in front of me for my build up, one is a 302 lift intake and exaust at the cam with a duration of 230 for both at .050 and 114degrees of lobe center, the other one has a lift of 320 with a duration of 225 at .050 and 108degrees of lobe center
"this is to go in a 377 stroked 350 4 bolt with:
keith black flat top PT.NO. KB134 7cc flat top piston 10.7/1 compression ratio
3.750"stroke 4.00" bore 377 displacement 5.700" I beam rods.
heads
Casting # 002-0902-2153
valves 2.020 intake and 1.6 exaust
Port volume 200cc, extra thick deck, chamber volume 64cc with angle plug,
manganese bronze valve guides, hardened intake and exhaust seats.
and 1.6:1 roller rockers
intake
Linghfelter Accell Supper ram with 20.85lbs/hr injectors at 50psi and a to be developed custom burn ecu
what would be my best bet this is going into a 91 firebird convertible (yeah I know there's some frame stiffening to do!) with stock for the moment 700R4 and 2.72 gears in the rear (will probably change to 3.25)"
IM assuming those .302 and .320 lift are lobe lift not valve lift figures?
your valve lift with the stock 1.5:1 ratio would be .453 and .480 at the valve
with a 2.72:1 rear gear and stock converter NEITHER cam is a good choice
IM GOING to ASSUME its a roller cam simply because its a EFI 1991 engine?
swap to a 3.54:1 -3.73:1 rear gear and go with a 2800rpm-3000rpm stall converter and both cams could be used, but without knowing clearances its difficult to guess, if you stay with the current drive train your best choice for a cam will be slightly milder, but the compression ratio is too high, the port size is too large and the injector size too small for a mild cam so ID strongly suggest you make the necessary changes
ID suggest a 3.54:1 rear gear ratio
a 3000rpm stall converter
36 lb injectors
and a cam like this, to maximize the super ram and 377 displacement with its potential high rpm power band
http://www.crower.com/misc/cam_spec/cam_finder.php?part_num=00471&x=57&y=8
heres some valid info, you can ignore the advice but if you don,t match components , selected to the intended rpm and power potential it will run at far lower than its true potential
http://forum.grumpysperformance.com/viewtopic.php?f=52&t=904
http://forum.grumpysperformance.com/viewtopic.php?f=52&t=1070
"this is to go in a 377 stroked 350 4 bolt with:
keith black flat top PT.NO. KB134 7cc flat top piston 10.7/1 compression ratio
3.750"stroke 4.00" bore 377 displacement 5.700" I beam rods.
heads
Casting # 002-0902-2153
valves 2.020 intake and 1.6 exaust
Port volume 200cc, extra thick deck, chamber volume 64cc with angle plug,
manganese bronze valve guides, hardened intake and exhaust seats.
and 1.6:1 roller rockers
intake
Linghfelter Accell Supper ram with 20.85lbs/hr injectors at 50psi and a to be developed custom burn ecu
what would be my best bet this is going into a 91 firebird convertible (yeah I know there's some frame stiffening to do!) with stock for the moment 700R4 and 2.72 gears in the rear (will probably change to 3.25)"
IM assuming those .302 and .320 lift are lobe lift not valve lift figures?
your valve lift with the stock 1.5:1 ratio would be .453 and .480 at the valve
with a 2.72:1 rear gear and stock converter NEITHER cam is a good choice
IM GOING to ASSUME its a roller cam simply because its a EFI 1991 engine?
swap to a 3.54:1 -3.73:1 rear gear and go with a 2800rpm-3000rpm stall converter and both cams could be used, but without knowing clearances its difficult to guess, if you stay with the current drive train your best choice for a cam will be slightly milder, but the compression ratio is too high, the port size is too large and the injector size too small for a mild cam so ID strongly suggest you make the necessary changes
ID suggest a 3.54:1 rear gear ratio
a 3000rpm stall converter
36 lb injectors
and a cam like this, to maximize the super ram and 377 displacement with its potential high rpm power band
http://www.crower.com/misc/cam_spec/cam_finder.php?part_num=00471&x=57&y=8
heres some valid info, you can ignore the advice but if you don,t match components , selected to the intended rpm and power potential it will run at far lower than its true potential
http://forum.grumpysperformance.com/viewtopic.php?f=52&t=904
http://forum.grumpysperformance.com/viewtopic.php?f=52&t=1070