Some said I would never do it but it happened. I snapped my H165 on a launch off the line yesterday. I broke the left side axle. Things keep breaking on me. The A14 motor ran similar times as the A15. I got about 6 runs in that afternoon but when we went to the trophy round, it snapped in my first heat race.
I pretty sure that welding the H165 spider gears and applying all that torque with the supercharger and nitrous just over powered it.
I am actually happy it did. Next year I am moving up to the NAPZ24 motor and it would have happened for sure. Now I can rip the whole thing out from front to back and start fresh.
I am going to pick up a H190 today form Oliver at Z-Specialties.
Z Specialties
Its nice that he is only 5 miles down the road. He happens to have one out of a 1970 Roadster.
All in fun!

I dunna believe it. On the other hand I guess you could say the H165 did not break, but only the axle break. Did your assembly use 21, 28 or 31 spline axles?

Im not sure what spline axles where in it. I'll take a look when I get a chance to pull it out. Im done racing for the year so Im not in any hurry.

Dont the roadsters have the same sized axles as a H165 anyway? and was the H165 out of a 1200 ute or another roadster?

I have not had a chance to take the differential apart. But this one that I bought has a larger center pumpkin with 10 fastener studs over the H165 that only had 8. The H165 came out of a mid 1960's 411 sedan. Here's what the H165 looked like.


The axles on this one were definitly bigger in diameter over the H150 that I broke earlier this year.
I pm'd Sidedraught and he confirmed that the roadsters came with the H190. The rear diff just looks bigger over all. I would be surprised if the axles were the same diameter.
I'll have it apart shortly to take a look.

mmm i was pretty sure that the 411 h165As had the same sized axles as H145 and H150s and the H190s had H165B sized axles

Well I could be wrong on what car the H165 came out of. The person I got it from said it came from a 411. But for sure the one I pictured had a bigger axle over the H150.