[jim larson]

Trying to identify a cam thats currently in my engine. The front is stamped 10309 or 10306 or 103096 or 103069?

The reason for the confusion on the stamping, is because a 6 is stamped over the 9 or the 9 is stamped over the 6. Thanks.

[TroyBoy]

Big block chevy?If so, I think I have found it.

[jim larson]

Originally Posted by TroyBoy

Big block chevy?If so, I think I have found it.

Yes, this is in a 1970 402 block.

[TroyBoy]

Well the # I found was 10306, the # 10309 was for valve springs.I guess they miss stamped it,anyways....Hydraulic cam ,2800-6200 rpm,228* @ .050, 284* advertised dur. 112 L/S , .544 lift. Hope this helps

[jim larson]

Originally Posted by TroyBoy

Well the # I found was 10306, the # 10309 was for valve springs.I guess they miss stamped it,anyways....Hydraulic cam ,2800-6200 rpm,228* @ .050, 284* advertised dur. 112 L/S , .544 lift. Hope this helps

Thanks, I have the engine apart to fix some leaks. Car ran fine if I added Octane supreme 130, 1 qt to 10 gallons of 92 premiumn gas. wanted to see if I could get it to run better with no octane by checking the static and dynamic compression ratio.

Is this information from an old Dynamics catalog or from a current cranecams catalog? Thanks.

[TroyBoy]

Cool! I actually found the specs in my 2005 Crane master catalog. I knew that they had bought CD a few years back and that they were single pattern grinds. I just wasn't sure about the #s because of the miss stamping. Good luck with the project

[jim larson]

Just checked my static and dynamic and found them to be 9.7 and 7.6. Does that 7.7 seem a little low? Could that be the problem with 92 octane gas, so I have to bump it up with Supreme 130? thanks.

[F-BIRD'88]

If it only takes 1 quart of race gas in 10 gallons to supress the detonation you should be able to tune it out with some fine tuning.
Make sure no oil is getting in the combustion chambers.
PCV/valve covers baffles, intake manifold gasket vacuum leaks.

Make sure you have the correct type and heat range spark plugs.

Correct carb jetting, no intake leaks. Sufficiant fuel flow volume under power.
Correct spark advance (initial mechanicalcurve and limit and vacuum advance.)
mechanical should not exceed 38deg BTDC at max advance.
vacuum advance is critical and should not exceed +12deg at the most.
Recurving the distributor will help the throttle response
and detonation threshold.

If the real compression ratio is 10.5:1 or less you should be able to get it right with tuning.

If the camshaft is/was installed too far advanced the engine will ping more readily. (verify .050" open close timing points)

[jim larson]

thanks everyone.

[cobalt327]

Originally Posted by TroyBoy

I guess they miss stamped it...

Sounds like the "new guy" held the stamp upside down when he ID'ed it! lol

Actually, I used that cam in a 468 BBC I built in about '95. It was a good cam, I really liked it.