Originally Posted by rkreigh (Post 331164)

I know this is a very old thread, but so far I haven't seen any evidence of

1. fancy spark plugs
2. super conductor wires
3. coils that are "better" than factory

the gm stuff works and will support reliably over 700 hp so why mess with success. Over the years all the fancy msd and deamon coils seems to suffer early failure and until I see a baseline dyno, and then another one after the swap make more power, I think the stockers might be the best. But maybe the old coils are better than the crap AC delco slings out now.

I ran the fancy magnecore wires, big chunks of the silicone just fell out of the wire like it had been cut out.

The factory stuff is engineered better, and seems to light the fire just fine at even higher compression ratios. I've tried the fancy plugs, wires, coils, now I listen to Pete because he's faster than I am with a stock block

Dyno is the truth teller and cuts through the BS about what works and was doesn't MPH at the track is a good tell also

Phil, I'm glad you are running the MSD stuff, I hope it holds up. I heard bad things about the Accel, deamons, and the MSD over the years. QA on MSD and parts in general is in the tank with out of box failures being more common

In the old days of "waste spark" the coils would corrode and go south after 20-30 k miles You would notice misfires, and high boost power drop off. With high cyl pressure of the Lt5, you would think the stockers wouldn't be that great. I have 106k miles on the old 95 coil packs and I wonder if I should change them out with "new delco NOS" which seems to stand for

:"not optimum sh!t" in recent years after the many folks went to cheap manufacture at the price of quality. Me thinks the old stuff was better.

Originally Posted by ZR1CK (Post 331634)

BWD coils, made in the USA. :flag: Given the choice, I still prefer to spend my $ here at home, providing of course, the quality is there. My choice of plug wires were MSD. They advertise 50ohms or less per foot. I've used 'em for several years on a few of my rides, including daily drivers, and measured the ohms prior to install and many miles afterward and they still read 50ohms or less. Until just last year when I purchased a 25' roll to custom fit to my "Z", they did not measure as advertised. I checked 'em with two different meters and they both read the same. I still used 'em and the motor runs fine, I just plan on purchasing elsewhere next time.

Originally Posted by dredgeguy (Post 340005)

I have a misfire and emailed Marc and he said coils. When I asked which brand he said, "We use AutoZone Duralast C849. They are made by Wells and are of excellent quality".
That works for me.