> 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).
That grind's low on lift for the duration. The 4V heads really
like more lift. The 2V''s have less ultimate flow but get the
flow at lower lifts.
>The power valve
>is what ever came stock in the Holly 650 double pumper.
My books show a 6.5" power valve. As light as the Tiger
is, I bet you never crack it open. Check idle and cruise
vacuum with a guage. The power valve should be 1 to 2
points below. Then you can lean out the jets to compensate.
>I am also running flat topped pistons to be able to run
>on the crappy 93 octane gass in Florida.
Don't remember if you have open or closed chamber
heads but the closed can handle 11:1 on 93 octane.
Opens are okay to 10:1 using TRW or KB domed
pistons.
>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.
That's a shame. I had good luck with Lunati when I snapped
the head off an exhaust valve and grenaded my first 351C
in the '66 Mustang. The cam was damaged by the debris
but Lunati replaced it at cost. However, Lunati doesn't
have much in the way of selection for the 351C. On the
Pantera, I went with a Cam Research cam. They grind
custom cams for Fords only and the cost is quite
reasonable.
Are you running stock valves in the 4V heads? You do
know they are two piece and have a nasty reptation for
separating and/or pulling out of the multi-groove keepers?
Dan Jones
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