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Can anyone tell me what plugs they have in thier ZZ4 crate motor? Mine are AC Delco # MR43LTS, but I'm not sure that's correct. GM Performance does not list what plugs should be in there. I went to a dealer and he contacted GM Performance and could not get a good number, WTF?
DaveM 2009-02-25 10:26:48
They came up with FR5LS, but they are different, mine has a tapered seat and the FR5LS has a square shoulder with a washer.
Help!!
Dave
Lifetime Member #116
Dave's '82 
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Dave, my ZZ4 came with AC MR43LTS plugs, this is what I currently run..Terry
"I Love all Corvettes! LifeTime Member #60..Terry" 
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Thanks Terry.
Lifetime Member #116
Dave's '82
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V
Lifetime Member
Send PMBelvidere, IL - USA
Joined: 10/24/2004
Posts: 440
Vette(s): 1977 Black T-Top ZZ4 5Sp 16in Wheels
Hi Dave! those are the correct plug for a ZZ4. I was told at the chevy garage they are a marine plug! Not cheap, had to order, they don't stock. Dick
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in Forum: C3 Engines, Driveline and Handling
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