I would suggest a steel drum available from any sponsors on the board. They are all competitive in price.
An engine rev limiter will have no real effect on drum failure. If anyone took my previous posts that way, I guess I need to clarify.
The drum fails from exceeding its designed rpm limit. The only real way to get to that rpm is with gear multiplication. When the sprag fails, the drum is instantly accelerated because the low gear set in the trans comes into the equation. Low gear ratio is 2.45 :1 . So, engine rpm x 2:45 = drum rpm.
My idea was to add a drum speed sensor. With normal transmission operation, the drum speed should never be higher than engine speed. If drum speed would exceed engine rpm, the engine would be shut down regardless of engine rpm if a drum speed sensor was a limiter input.

I upgraded the drum and sprag a few years ago in the thought of safety. I spent thousands on the engine. For a lot less then that I can add some insurance to the tranny. One thought I've always had is I watch guys stage their car and don't bother taking the slack out of the transmission. I wonder if this can't play into it? I've seen some back into the second amber because the over ran it and just slap it in low gear. I don't know, but it always makes me cringe.

That probably causes a large percentage of failures with non LBA valve bodies.

Kevin

When you go to stage you need to be rolling forward a couple of feet while
in low so you set the sprag.. I wonder why all the old timers didnt have
issues.. back before there was any trick drums the guys use to use just
a stock drum.. for years and years I was told NEVER pedal while in low
gear SHIFT IT FIRST.. get out of low as soon as you can.. it can ONLY blow
when you pedal it in LOW.. also I was told not to put it in neutral to clear
the engine without have a couple of feet or more to roll forward in low..
these old timers still have both feet.. but it was pounded into their heads
not to pedal it in low.. you already lost the race so why break your stuff

My brother and I have never blown one up or even seen one blow up. He races way more then me but I did race a lot back in the late 70's and early 80's. My brother goes racing at least twice a month and me about twice a year. Ron

Yeh... stock cast drums that are decades old, with who knows how many miles them.
I put a billet steel drum in my 11 second street/strip car ... because I can't get a new foot for $600

You can't see a Dr. in any emergency room now for less than a baziillion dollars now, correct
AKA aside, I've seen the results of front drum exploding at the track, NOT GOOD
Luckily both drivers where not injured much
Not so on both cars

The guy who blew the drum on the 13 second car was warned by his trans guy to put a drum in it, an LBA valvebody or at least a blanket on it. He said he couldn't afford it. The drum messed his foot up bad enough he was off work for a month.