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Old 08-09-2016, 11:35 PM
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Correct plugs and gap for ZZ4 crate engine?

I bought a car with a ZZ4 small block Chevy. It's basically stock with the exception of a Edelbrock intake and carb, and a MSD ready to run distributor. I pulled a plug to see whats in there and what shape they are in. They're AC Delco MR43LTS plugs. I looked them up on the 'net and they show as marine plugs! Are these plugs ok in that engine?

Also, what should the gap be? Does it need to be larger because of the MSD ignition? There is no ignition box on the car, just the ready to run distributor. The largest plug gap tool I have goes to .040" and that was loose. What should I set the gap at with this ignition and plugs? Are these plugs ok to run in this engine?

Thanks!

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Old 08-09-2016, 11:50 PM
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That plug is correct, maybe a bit on the cool side but not out of range. If plug fouling proves to be a problem, you can step warmer to a 44, warmer yet would be a 45.

R45TS was the almost universal plug for the SBC from 1970-1987.

Plug gap is fine anywhere between .035" and .045"
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Old 08-11-2016, 10:02 AM
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OK, Thanks so much for the answer.
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Old 08-11-2016, 12:04 PM
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what heads are on your zz4?? are they aluminum??
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Old 08-11-2016, 08:02 PM
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Quote:
Originally Posted by Doug427 View Post
They're AC Delco MR43LTS plugs.
I think the ' L ' stands for longer threads than the R45TS Eric mentions... As I recall, the -113 Aluminum heads need the longer threads ~3/4" vs ~ 1/2"... To get the tip of the plug all the way in where it belongs...

M for marine may mean they're made of a less corrosion prone metal in some places... and cost a $1 more each...
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