So, just a future reference for me... getting my research together...
In the future I would like to build a Early Bronco (66-77) with a 250 and Alum head...
250 block - because I can put the v8 c4 behind it
alum head - I've always wanted one, but never did get one (might have to put one on the self)
Goal on Bronco Build
1inch Body Lift
2.5 inch Suspension Lift
35 x 12.5 r 17 tires (on bead locks)
C4 stock trans
4.56 gears, possibly 4.88 gears (thinking of 36/37 inch tires)
Cut wheel wells... the tires have to fit somewhere...
Wagon top
d44 front axle with e locker
9 inch rear axle with e locker
HydroBoost Brakes... uses power steering.
the 250 needs
AC
Power Steering pump
ALT
Water pump
4bbl intake (Affordable Fuel Injection with programmable computer)
DS2 re-curved for CAM
stock rockers
6 to 2 to 1 exhaust (CI headers are amazing)
so here is my dilemma.... the CAM... which one?
... IT has to run smooth, have power, and not be hard to tune.
I need torque, lots of torque for the whole range.... and great throttle response
Cruising speeds at 70mph should turn 2900-3100 rpm max
so
35t/4.56g = 3066rpm
36t/4.56g = 2980rpm
37t/4.88g = 3103rpm
all pushing a barn door down the road.
So I need torque at 3k rpm, and peak HP close to that also... it won't be a high rev motor, but a work horse in the lower rpm range... I'm guessing it won't see more than 4250 rpm if built right... okay maybe 4500-5k... but shouldn't need to. So I know carb restriction will be required to boost air velocity and throttle response.
Things to fix,
rear sump required - grap bottom half of 170 oil pan, weld to top 250 pan, different oil pick up... modify crank bolt
can't get a keyway for the cam, so I'll have to play with the crank pin... I figure the stock 4* advance would be best... maybe 6* for chain slack.
brackets for the accesories... want to convert a old school AC compressor for a tire pump for air up on trails (bead locked tires can go down to 1-2psi for snow) and still run modern AC...
Everything else I think is standard...
In the future I would like to build a Early Bronco (66-77) with a 250 and Alum head...
250 block - because I can put the v8 c4 behind it
alum head - I've always wanted one, but never did get one (might have to put one on the self)
Goal on Bronco Build
1inch Body Lift
2.5 inch Suspension Lift
35 x 12.5 r 17 tires (on bead locks)
C4 stock trans
4.56 gears, possibly 4.88 gears (thinking of 36/37 inch tires)
Cut wheel wells... the tires have to fit somewhere...
Wagon top
d44 front axle with e locker
9 inch rear axle with e locker
HydroBoost Brakes... uses power steering.
the 250 needs
AC
Power Steering pump
ALT
Water pump
4bbl intake (Affordable Fuel Injection with programmable computer)
DS2 re-curved for CAM
stock rockers
6 to 2 to 1 exhaust (CI headers are amazing)
so here is my dilemma.... the CAM... which one?
... IT has to run smooth, have power, and not be hard to tune.
I need torque, lots of torque for the whole range.... and great throttle response
Cruising speeds at 70mph should turn 2900-3100 rpm max
so
35t/4.56g = 3066rpm
36t/4.56g = 2980rpm
37t/4.88g = 3103rpm
all pushing a barn door down the road.
So I need torque at 3k rpm, and peak HP close to that also... it won't be a high rev motor, but a work horse in the lower rpm range... I'm guessing it won't see more than 4250 rpm if built right... okay maybe 4500-5k... but shouldn't need to. So I know carb restriction will be required to boost air velocity and throttle response.
Things to fix,
rear sump required - grap bottom half of 170 oil pan, weld to top 250 pan, different oil pick up... modify crank bolt
can't get a keyway for the cam, so I'll have to play with the crank pin... I figure the stock 4* advance would be best... maybe 6* for chain slack.
brackets for the accesories... want to convert a old school AC compressor for a tire pump for air up on trails (bead locked tires can go down to 1-2psi for snow) and still run modern AC...
Everything else I think is standard...