At 09:40 AM 3/26/99 -0600, you wrote:
...
>What sort of cam are you running? I have a 735 Holley
>(same throttle plate size as a 780 but with higher gain
>but more restrictive primary boosters) off a 428 CJ
>on the Pantera and pull 20 mpg on the highway, without
>vacuum advance. An idea what size your PVCR's are?
>A lot of Holleys have huge PVCR's - on the order of the
>size of the jets, doubling fuel flow. If you're at stoich at
>cruise, you'll need something on the order of 25% more
>fuel for best power, not 100%. Other things to do to save
>fuel are back off on the accelerator pump and power valve
>trip point.
>
>Dan Jones
The cam is a Crane 524421 HIT-280-2-NC
280 duration on intake, 288 on exhaust. Intake lift .506
Ex lift .519. Recommended for 2500 to 5500 Rpm. I also
have Harland Sharp roller rockers and the Crane Hi-Intensity
lifters ( the leaky ones that make noise). The power valve
is what ever came stock in the Holly 650 double pumper.
I am also running flat topped pistons to be able to run
on the crappy 93 octane gass in Florida.
Previously I had the Ford SVO cam in the 351C and I
believe it provided more power than the Crane, however,
after 15,000 miles it wiped a cam lobe and lifter. That
really pissed me off and I didn't go back to Ford. Ford
guarentees their SVO parts until you walk out the door.
James Barrett Tiger II 351C and others
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