Spark Plug and gap recommmendation 73.5 CIS
 

I've come across several numbers and gap sizes for my 73.5' 2.4 with CIS. Stock with under 100K miles. NGK, Bosch, .022, .024,.028, ? WR5DP, W5CC, WR7CC, BP5, BP6, BP8 ES???? TIA

if a Bosch CD unit use stock factory plug gap as per its design

the CIS should run BPR7ES or BPR8ES clean imho.



ps: NGK

The factory manual says .022 for a plug gap. What about that?

.022 yep.

Forget about the Bosch copper plugs. I bought everyone left in the western hemisphere and that was only seven of 'em!!!!!!!!!!!!!!!!

Look at NGK.

Bob
73.5T in Sepia of course

Thanks for the suggestions. Anything different if Permatune replaces the Bosch unit?

i never followed what gap Permatune can tolerate so i just set them to "76/77 Tehnical Specifications" booklet Bosch specs of .028" as some 1977 came with factory old model Permatunes like mine

and according to a local pope the ideal gap for our combustion chambers etc is .040" which i use now with the MSD

some members use larger than stock gaps with Bosch and Permatunes

Thanks for all the input!