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Motor inspection questions, Rev Kit??

820 Views 5 Replies 4 Participants Last post by  TWC
We're disassembling my motor during the off season to inspect it as we're also installing AFR 335 heads. Two things came up that I'd like some input on.

There is evidence of metal transfer between the timing gear and the end of the cam. Everything was tight and there was no sign of movement but when we took the cam gear off there was an area maybe 3/8" x 1/8th x 30 thou. deep which spalled off of the back of the gear and attached to the end of the cam. The cam dowel was alittle loose also. we used ARP bolts and the timing gear is a cloyes billet piece. Anyone have ideas or experience with this ?

The cam shows some wear on three or four lobes. It is a comp roller cam w/ comp rollers. My machinest suggests using a rev kit to eliminate the little bit of tolerance caused by the lifter lash so the rollers stay in constant contact w/ the cam. Again any experience or comments on this suggestion??

Thanks for your input.
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TWC said:
It is a Cloyes Quick Adjust Billet Timing set # 9-3710-A. Cloyes Timing cover w/ solid thrust bearing machined to proper tolerance.Cam is:
Comp # 11-808-9 Roller Cam Lift .782 intake / .72 Exhaust
Duration @ .05 289 Intake / 289 Exhaust
112 Degrees Lobe Separation Set @ 110 ICA
Comp CB Super Roller Lifters # 819-16
Crower 1.7 Roller Rockers
Many of the timing chain sets we see, ALL brands, often don't sit well on some of the cam snouts. We notice it more on the BB units. They actually have a slight interference fit (not by design, but by mfr. tolerances). Many of the cam gears themselves we trim in the lathe. This is very easy item to overlook. You think the bolts are tight, but when it runs in the unit, the gear starts to "wobble" and all hell breaks loose. It doesn't show up as easy when checking the end play because the "button" sits directly on the cam. Thanks, Gary in N.Y.
P.S. I'm just slightly curious about your combo, assuming it's the one in your signature. A small (496" BB) unit, a 289* @ .050" cam, 4.10 gears, and 3600+ lbs., I'll admit I don't see the C.R. (although I can't see that mattering one way or the other), and your going to put a head on top that flows 400+ CFM (guestimated). I'd really like how this unit runs when you make the initial passes. This is just out of sheer curiousity.
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