Are you running a street solid roller or a race solid roller?
Comp lists their hydraulic roller cams and certain street solid
roller profiles as being compatible with OEM cast iron cam gears.
I called Comp to discuss this and the tech I spoke with (Dennis)
said their -8 part number hydraulic and street roller cam cores are
austempered ductile iron. A surface treatment hardens the cam lobes
so they can run a roller lifter. He also said either a cast iron or
cast steel distributor gear is compatible with the -8 cores to run
with the cam. Not compatible are machined steel gears like the Crane
351C part which is made of 8620 steel, the same as a solid roller
gear. He said the OEM and Ford Motorsport steel gears are a cast
steel and would work fine but Ford doesn't make one for a 351C.
Solid roller cams are usually ground on 8620 billet cores and require
bronze distributor gears. It may be possible to use a machined steel
gear like the Crane (though Mike Trusty had trouble with his) but not
an OEM cast steel gear.

I just got off the phone with comp tech and they told me that the cam I have requires a bronze gear. The part number is 34-710-8 and he said it was a billet core not austempered ductile iron. Hummmmm, has me wondering if maybe some are iron and some are billet even though they are -8's.

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Larry

No fast Fords at this time but one fine cruising 96 F350 CC DRW Power Strokin diesel.
And one rusty 64 Fairlane nick-named the Rust Bucket....And sometimes called the Money Pit...