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#11
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Problem is, Delco doesn't make their plugs any more...simply repackages them...wanna say they're made by the same place that makes Champion plugs? The side cut Autolites work ok. When we messed with plugs on the dyno, my beloved AC's were horrible...no matter of the heat range, they all SUCKED...stuck in an NGK, and I've never looked back...
Here's some plug info I posted a while back: ---------------------------------------------------------------- <u>Z28 & LT-1 with 186 heads:</u> my AC book calls for a C43 or an R43 plug, and the NGK site says- Standard, V-power (3/8" reach, 13/16" hex, projected tip, gasketed seat): XR4 / 5858 XR5 / 3332 Race, V-power (3/8" reach, 5/8" hex, projected tip, gasketed seat): R5670-6 / 4449 R5670-7 / 5034 R5670-8 / 5657 R5670-9 / 6468 R5670-10 / 6702 <u>L78 & L72 with 840 heads:</u> my AC book calls for a R44 or a 44N plug, and the NGK site says- Standard, V-power (3/4" reach, 13/16" hex, projected tip, gasketed seat): GR4 / 2635 GR5 / 2851 FR4 / 5155 (same as GR plugs, except for 5/8" hex) FR5 / 7373 (same as GR plugs, except for 5/8" hex) Race, V-power (3/4" reach, 5/8" hex, projected tip, gasketed seat): R5672A-8 / 7173 R5672A-9 / 7405 R5672A-10 / 7942 R5671A-7 / 4091 (same as 5672, but with non-projected tip) R5671A-8 / 4554 (same as 5672, but with non-projected tip) R5671A-9 / 5238 (same as 5672, but with non-projected tip) R5671A-10 / 5820 (same as 5672, but with non-projected tip) R5671A-11 / 6596 (same as 5672, but with non-projected tip) <u>L78 & LS6 with 291 heads:</u> my AC book calls for a R43T, and the NGK site says- Standard, V-power (.460" reach, 5/8" hex, projected tip, tapered seat): UR4 / 6630 UR5 / 2771 UR6 / 7773 YR5 / 7052 (same as UR plug except w/ non-projected tip) Race, V-power (.460" reach, 5/8" hex, projected tip, tapered seat): R5674-6 / 4449 R5674-7 / 5034 R5674-8 / 5657 R5674-9 / 6468 R5674-10 / 6702 R5673-6 / 2405 (same as 5674, except w/ non-projected tip) R5673-7 / 2817 (same as 5674, except w/ non-projected tip) R5673-8 / 3249 (same as 5674, except w/ non-projected tip) R5673-9 / 3442 (same as 5674, except w/ non-projected tip) R5673-10 / 4050 (same as 5674, except w/ non-projected tip) |
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