Yup, they blame ionized air all the time. Lololololol Those Stupid lying fuks. Excuse the french.

Ok, but why change???
TB IV's are very reliable and to change the timing curve, you just need change modules.

Of course the MSD ready to run Marine distributor is a piece of crap. I bought 2. The saga continues.....

the delco or its clones is a better way to go delco voyager est they are simple reliable and work well was oem on many brands

Are you running a Delco esc distributor I have a carbed 502 and the spark is weak on the thunderbolt. Can I run the distributor and coil only or do i need a ignition box. Any recommendations on distributors.
Thanks
Jeff

I’m running Delco distributors on my 509s. They throw advance really early so don’t let that throw you. Set the max timing and let the idle timing fall wherever.

I used them box-stock from my leftover MPI parts. Coil, distributor, and harness.

Weak spark could be the coil or grounds. Thunderbolt ignition is pretty bulletproof.

I've had really good luck with DUI (davis unified ignition) replaced 2 rotted out MSDs with them and they worked perfectly

we are running the delco est on 540 ci 750+ hp top end timing is 32 degrees