| Re: [GMCnet] spark plug gap [message #310668 is a reply to message #310651] |
Sun, 20 November 2016 14:49   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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Len Novak wrote on Sun, 20 November 2016 13:17Gents,
1978 GMC, 403, Delco R46SZ
The air cleaner says .060, but I hear that may be too wide.
Len,
That is because in tests run in the early 70's it was discovered that wide gaps and hot sparks reduced misfire and therefore HC emissions.
But the fact became clear shortly after the release of the HEI that 0.060 was too much for the hardware. OOPS
Gap is really important to over all performance, but too wide can be tough on the systems unless they are built up from OE.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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