Offshoreonly.com - Thunderbolt IV

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fastskipper

01-27-2005 05:50 AM

Thunderbolt IV

I have an opportunity to buy a Thunderbolt IV ignition “black box”. It is out of an early 90s 340HP inboard. Would this unit work well on a 89 365HP 454?

JIMG	01-27-2005 08:24 AM

Re: Thunderbolt IV

The module in the 1989 454 mag, & a 1991 7.4 inboard engine have the same part number. So that would work the same as original (same part).

fastskipper

01-27-2005 06:18 PM

Re: Thunderbolt IV

Thanks for the help JIMG.

Crazyhorse

01-27-2005 08:37 PM

Re: Thunderbolt IV

You could try a V-6 module to see if you like it. The advance curve is quite a bit different, allowing more initial advance than the Mag module.

Lofty

01-27-2005 11:09 PM

Re: Thunderbolt IV

I've got 4 v6 modules if you're interested. The advance curve is much better.

fastskipper

01-28-2005 11:18 AM

Re: Thunderbolt IV

I wish I would have known sooner I would have tried the V6 version. I already purchased the 340HP one.

Thanks for the info

Crazyhorse

01-28-2005 04:40 PM

Re: Thunderbolt IV

It never hurts to have a couple spares.

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