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08-30-2012, 11:51:29 PM
You got a BBC or SBC.. What plugs are you running in it?

Non-standard or custom heads should probably be mentioned as it plays a factor.

Preferred brands? Whats working for you?

08-30-2012, 11:56:26 PM
355 9.5:1 compression lunati mild cam
Edelbrock heads

AC Delco gapped at .033.... H.E.I

08-31-2012, 12:36:39 AM
406, iron eagle heads, 10.4 compression

NGK V-Power -7 heat range gapped at .040" HEI

Rich Schmidt
08-31-2012, 08:50:25 AM
I run a bigblock with GMPP aluminum heads. They use the .750"reach(long thread) gasket seat plug and need the smaller 5/8" head for a socket to fit on. I use Champion race plugs because I dont want a resistor. It may or may not interfere with your radio/electronics,but usually not as bad as solid core wires. In my case my engine is a race engine that has a little too low of compression ratio for the cam I have so I run a bit hotter plug then race engines usually use. I have a C59CX which seemed to run better and stay clearer then the C57CX's that I used to use.

Many aftermarket aluminum heads use the gasket seat plugs that require the special 5/8" hex. I later found that aluminum headed Corvettes also use this plug type and I could run Delcos or anything else I wanted for much less money.

On my hot rod street car it has a slightly too high compression with factory iron heads,and I run cheap Delco R45T's with a stock points distributor,Crane electronic conversion,Crane coil and low resistance wires.

I have found that the ignition system is more important then the plugs as long as the plugs are the proper heat range. Plugs foul when the gap is shorted out from too much fuel,or oil in the chamber. A strong igintion system plus low resistance wires really helps this.

I dont run trick plugs on my serious go fast race stuff. The trick plugs that have pointy little electrodes and ground straps ect are going to melt way faster and run much hotter then a regular plug that has some meat on it. Plugs getting hotter from tiny little ground straps and tiny platinum electrodes is a sure fire way to cause detonation.

Thats just my experiance.

08-31-2012, 09:09:43 AM
I have the fast burn heads GMPP 383. Started out with the R-42LTS Seemed to dark. Changed to R-44LTS ac delco's Seems to burn cleaner....Not too bad priced platinum plugs. GMPP recommends these two plugs for this motor, #42 is race and colder, #44 is street and next size warmer. gapped at .040 GM Performance HEI dist.

08-31-2012, 11:09:21 PM
AC R43 70 LT1 2.02 heads.

08-31-2012, 11:44:05 PM
R45TS delco. 496, 460, 468 big blocks

09-01-2012, 08:02:37 AM
AC R44T all stock 1973 SBC 350

09-01-2012, 08:17:04 AM
Dart Pro 1 NGK BKR6E.

09-01-2012, 04:55:49 PM
I have several engines with 781, 049 and 215 heads. For the tapered seat heads I use AC R44TS or R43TS and for the long reach gasket plug heads (the 215s) I use R44XLS.

09-01-2012, 07:27:23 PM
355 - 10.4:1 Edelbrock RPM angle plug heads
I tried AC Delco, Champion, & Autolite and the Autolites seems to perform best and last the longest - Autolite 3924

But, with knowledge that Autolites are now made in China - http://www.nastyz28.com/forum/showthread.php?t=246069&highlight=autolite - I want to try NGK

Looks like NGK FR5 which is PN NGR7373

09-02-2012, 09:29:44 AM
...AC MR43LTS plugs on both my cars, DC:bowtie: