Re: Novak vs Advance Adapters ?
I've used both quite a few times - often a customer brings me what he bought for me to install it, so I have to use what he brings me.
If he'd ask me beforehand, I'd prefer the Novak. Sometimes they seem like identical copies of each other, but you can tell the difference by the attention to detail. The finished surfaces, the fit, the over-all quality of the Novak is much better.
But - AA has lots of goodies the Novak doesn't, so sometimes you are stuck with AA.
Too many times I've had to re-machine AA tranny adapters, bellhousings etc. I've only had to do it a couple of times with Novak.
Always check the front/back surfaces for parallelism and make sure you check runout (the centering of the tranny hole with the crank centerline. Often they are waaaay out - using it like that will give troubles for sure!
Consider either one a rough, but close adapter. You do the finishing touches for the perfect fit.