[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.

 

[bracketchev1221]

Well I have never seen that on a gear unless the gear was moving. Question 1 is that an adjustable gear or solid? If its solid make sure the bolts aren't too long in the holes and bottoming out allowing the gear to move. As far as the rev kit I like them personally and have run them in all my motors with roller cams. Yes it keeps the roller seated on the cam and in the case of valve train failure (pushrod, lifter etc.) it keeps the lifter from beating the cam to death.

 

[TWC]

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

 

[kjett]

What does the distributor gear look like (cast or bronze)? Not enough end play (.008-.012)? The Cloyes timing sets that I've used come with a torrington bearing that goes behind the cam gear to keep it off the block. I assume you were using this bearing, too. If so, does it look ok? Scary....

 

[GOSFAST]

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.

 

[TWC]

The dist. gear is bronze. I'll check it tonight. I don't think the timing set came with a torrington bearing.
Gofast, thanks for the tip. We'll check the fit on the new one for sure!!
i e-mailed you a stat list on the car. the new computer model shows 100 H.P. gain w/ the new heads. I went to the aluminium to save weight and AFR's seemed to be the best choice. The C.R. was @ 12.85 and we will be checking the new heads and calcing the new C.R. next week but it should be around 13 to 1 .