03-09-2017, 07:58 PM

jciwolf

Member

Join Date: Mar 2013

Location: largo,fl

Posts: 46

1970 GTO 400 Spark plugs

Does anyone know why the spark plugs on my 1970 GTO 400 engine have AC Delco plugs #R45TS with a gap of 0.040 and the Haynes Manual says R45S with a gap of 0.035? It also has an HEI distributor, and a 4bbl Holley carb, if that makes any difference. The R45TS has 5/8 socket size. Appreciate any help. JCIWOLF:

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