Hot Rods Whats My Gap?

Here's another one.
I have a SB 350 from a 74 Camaro, nothing special in it, still has the original size pistons, cam & crank. It does have a 4brl, Edelbrock 600 CFM carb. (1406).
And MDS ignition.
So the question is, what's the plug gap? (AC Delco R45)
I've read on line it should be 45K.
What say you....
Thanks again, Joe

 

Thickness of a matchbook cover.

 

What sort of ignition? Something with a 6AL box will set probably set at a different gap than a plain distributor and coil. I'm assuming (I know) you're talking MSD.

 

in the other thread today about what to set the plug gap with an MSD ignition, the answer was .045"

 

Mess with the plugs until it runs right. That is your new gap.

 

.045 will be fine.

 

.030 or .035. Sounds right to me. For something with points.

 

Happened to have my repair manual out, I so looked it up in "the book". Four barrel carb engines had R-44T plugs gapped at .035. 1975 engines went to electronic type distributors, plugs went to R-44TX and gaps jumped out to .060. In 1976 the plug went up in heat range to R-45 & R-46TX and plug gaps decreased to .045. So there you go.

 

.035 with points, .045 with HEI has always worked best for me.

 

Stock specs don't always work with aftermarket parts. With a standard style ignition, I'd run .030/.035. With an ignition box, I'd open the gap some - something like .045.

But the truth is that you probably won't tell much difference in the way the engine runs unless the gap is way to tight or way to wide.

 

And again I thank you all for your support.
Match book cover......really?!
I'm dumb, but I ain't stupid!
I'll go with the consensus of 45K
Yes MSD, no points.

PS: match book cover reads 15K
Stupid is, as stupid does......f.g.

 

Joe,
You might be surprised what you can do with a match book cover and the cellophane off a pack of cigarettes.

 

That's a very thin matchbook cover. If it reads .15, then simply fold it twice, and PRESTO!, you have now created a tool in which to set your spark plug and/or points gap to .45. It's not stupid, it's what mechanical-minded folks have used for at least the past 70 years. Don't knock it 'til you've tried it ... and please don't call me stupid, moron ...