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Has anyone actually degreed a stock cam with a Cloyes timing gear set?

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Wesman07
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Has anyone actually degreed a stock cam with a Cloyes timing gear set?

Post #1 by Wesman07 » Sun Mar 12, 2017 4:59 pm

I've been reading a ton of information about this.... but its all conflicting. From what I could gather is the stock cam has a 4* retard ground into it. The adjustable cloyes gear set can advance 4*, stay at 0 (which is 4* retard), or retard 4*....... at the crank. So that would mean that your stock cam options with the cloyes CLO-8-1014 gear set would be -2*,-4*, -6*

Am I missing something here?

Further more.... I would love to hear any real world experience with this, especially with EFI
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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Re: Has anyone actually degreed a stock cam with a Cloyes timing gear set?

Post #2 by CNC-Dude » Sun Mar 12, 2017 6:07 pm

The factory timing sets and factory replacement aftermarket sets were actually retarded, not the cam grind. So installing the cam straight up with a high performance timing set like the Cloyes should advance it 4° over the stock timing set. But you still need to check it to verify as always.
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Wesman07
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Re: Has anyone actually degreed a stock cam with a Cloyes timing gear set?

Post #3 by Wesman07 » Sun Mar 12, 2017 7:02 pm

I Agree, is there a way to check with the motor in the truck and intake manifold/valve cover on?
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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Re: Has anyone actually degreed a stock cam with a Cloyes timing gear set?

Post #4 by CNC-Dude » Sun Mar 12, 2017 7:40 pm

No, you'll have to at least pull the valve cover on the #1 cylinder side and install a degree wheel. Of course, finding true TDC is going to be more challenging, but necessary to confirm true cam timing events with any accuracy.
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Re: Has anyone actually degreed a stock cam with a Cloyes timing gear set?

Post #5 by pmuller9 » Sun Mar 12, 2017 7:41 pm

I actually took the time to check the stock cam timing on a 1983 300 with a degree wheel and dial indicator.
It was 3.5* retarded with the intake lobe center at 113.5* ATDC.
The .050" durations where really close to 192* and the .006* durations where also close to 268* considering it was a used cam.

You can do a close check by pulling the valve cover and setting the intake and exhaust valve tips so they have the same lift (as the exhaust valve is about to close and the intake valve is beginning to open.)
Then look at the timing tab at the harmonic balancer. It should show around 4* ATDC.

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