Is the stock TPI HEI ignition ok to use abow 6000rpm? Or is it time to get a better system, if yes, what to get?

 

Good question, I installed a Crane 6hi mainly because I got it cheap. All I've read and heard suggests that the HEI is very good and the real need for multiple spark is debatable, especially below 6000 rpm. Winter in Minnesota (if I stll lived there) I would certainly keep my Crane but your money may be better spent making sure the stock system is perfect....maybe add some good wire. When adding a hot ignition make sure the distributor module will handle the high switching current common to most CD ignitions. My stock module is holding using the Crane, 9mm wire and .065 plug gap.

 

Get a better coil and you'll be fine. If you are running higher compression then you might want to get a different system, otherwise you don't really need it. I went with Crane Hi-6S for the higher spark energey, multiple sparks and the built in rev limiter.

 

Would it help to put an aftermarket coil on a stock ignition?

LB9GTA

 

It certainly wouldn't hurt to have an aftermarket coil, but there would be no noticable difference in power. I installed the Accel 300+ system on my car for the rev limiter and so I wouldn't have to worry after I do additional motorwork.