Spark Plugs and Ping, question Options

[jsayre914]

Engine is 2056 with Raby 9550 Cam and D-jet

I have the stock Bosch plugs with factory gap
Running Pertronix with flamethrower coil
Engine timing is dead on the nuts
Valves adjusted 0 lash (chromoly with swivel feet)
AFR is 12-13 on the freeway

Fuel pressure is 30psi

Car runs great and has a lot of power all the way up to the redline. Engine runs very cool, seems to be happy. I have noticed that on a longer drive pushing higher rpms for extended runs there is a tiny bit of pinging unless i push down or let off the throttle, it goes away. I know that any ping even a teeny tiny ping is bad. SO...

I put Ultra Premium fuel instead of the midgrade and its still there. Keep in mind I might not hear it for a few days, but if I want to drive like I stole it for over an hour it can be heard.

I would rather not retard the timing from spec, and I dont want octane booster. So I was reasearching plugs and found that some new plugs might do the trick.

Question is do I want colder or hotter to cure my preignition. Is changing the plug my next step? A colder plug will help the preignition?



Joseph
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