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FASTMONTE 05-20-2004 04:15 PM

Spark plug gap
I have a H.O. 350 crate motor with roller rockers and an MSD ignition and i am running Autolite AR133 spark plugs and i was wondering what is the biggest gap i can go? I heard i could go .60 is this true?

BarryK 05-20-2004 04:32 PM

Yea its a good start. My 388 stroker with platinum plugs I started at .055 and increased .003 until it ran 1/8 the best. I painted about an 1/8 mile in road and used GPS to test. I ended up at .072 and 21 degrees before tdc. For peak tuning.
The difference from start to finish was a gain of 16 mph in the 1/8
but two days work.
Thats not the stroker you see pictured, its 57 312.

FASTMONTE 05-20-2004 04:40 PM

That is a huge gap!!! How was you car running when you were at the smallest gap? Since i have the MSD is this possible to have a big gap like that?

BarryK 05-20-2004 04:44 PM

I had same set up as you, so you just need to test. It ran good
at .055 but when done fine tuning, the tank of a 1955 was 11.9-12.1 in quarter.
There is just a lot of little things in the engine that will dictate where you should be, each engine and cam is different.
This is wrong forum for this. We will get spanking!

FASTMONTE 05-20-2004 04:49 PM

What do you mean wrong forumn. You mean to talk ETs? Ill have to try that . I have it set at .45 right now and i want to get the optimum fuel burn...

BarryK 05-20-2004 04:53 PM

Yea, I guess! This is paint and body.

FASTMONTE 05-20-2004 04:55 PM

Boy did i jack up!!!! I thought this was the engine forumn.... OOOPPPSSS

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