Re: BBC plug life
 

Don't know if this is comparable or not but my small block (421, 14 to 1 on c-12) runs on a 6AL with all MSD parts. Dist, crank trigger,box, wires and coil and my plugs were in for about 2 1/2 years before the motor had a miss, changed plugs and they have been in half of last year and all this and still working good.I'm using champion RC 59 YC plugs gaped at .035. And I do go over 7200 rpm.

Re: BBC plug life
 

The 6al will be fine. I use a 6al with an HEI distributor as the trigger. Have been using the same HEI now for probably 6 or 7+ years. I use the cap a dapt kit from MSD with a Blaster II coil and a MSD cover that has the wire hold downs. I have a 460BBC that runs 10.50's in good air, shift at 6400 and cross at 6700, but mostly run 1/8th mile. For me the HEI/6al setup has been just fine. A buddy of mine ran a 509 BBC shifting at 6600-6700 and crossing at about that in the 1/8th running 6.30's but he used a MSD billet distributor. Plenty of cars out there running 6al's and turning 7k. And like I said the HEI has worked for me up to 6700 but 7k+ I couldn't tell ya.

Re: BBC plug life
 

The 6A has been run in NASCAR for a long time in cup at 9500 +

Re: BBC plug life
 

Just to add a vote for 6AL , I have 468 BB 13 to 1 compression and use MSD Billet Distributor and the cheap MSD round coil no issues with plug life, car runs 10.20s @ 131. 6400 -6700 rpm no problems. NGK racing plug can't recall # presently.