Checking the Comp specifications looks like you should be able to run today's gasoline. Let us know if it changes the ram effect, passing without downshift, MPG, anything else related.
A number of members of the group were interested in the camshaft currently installed in my 300 F. It is a Comp Cams #21-222-4 (the kit with lifters is CL21-222-4). This is a hydraulic flat tappet cam. It is, by today's standards, a very mild grind and
Comp Cams states "excellent response and good mileage, stock torque convertor, 3.23 gear". They state the operating rpm range of the camshaft is 1,300 - 5,600 rpm, just exactly where the 300 F wants to run.
If you look at the "advertised" timing diagram you will think, except for increased lift, this cam is milder than the original factory cam. However, when you look at the timing events at .050" lobe lift you will see significant differences. The Comp
Cams unit gains 8 degrees of intake duration, 14 degrees of exhaust duration and most important for street driving, .032" of intake lift and .040" of exhaust lift. It also picks up 11 degrees of overlap.
The car does have a slightly more aggressive idle. I don't like slow idles so I am idling my engine at 750-800 rpm. The engine will happily idle slower but that is a number that gives me a smooth, consistent idle without excess jerking when putting the
car in gear. I am frankly amazed at the instantaneous response off idle. You have to concentrate to drive away from a stoplight without a slight chirp of the tires. The power comes on the minute you touch the throttle. Top gear performance from 50 mph
up is stunning. The car never seems to quit. I cannot find a down side to this camshaft.
This camshaft is not recommended for use with stock valve springs. My engine is using Crane #99837-16 valve springs. However, if you decide to purchase this camshaft I would recommend you speak directly with Comp Cams as to their spring recommendations.
Dyke Ridgley
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