I’m looking to build a new motor for my 71 442, it’s a convertible with 455 and a th400 with stock converter and 3:73 posi, my present motor is pretty much stock with the exception of C heads with bronze valve guides and W-30 springs. My cam is a mondello JM20-22, I’m running 10.5:1 forged trs pistons, I built it some 40 years ago and it still runs strong but I’ve noticed my oil pressure drops after the motor warms up, I figured it was due to bearing wear, looking to build a extra block I have and swap it out, at the time I built this motor joe mondello told me that this was the hottest cam I could run in it with auto trans and disc brakes. Does anyone have any suggestions on a cam?

 

That is the same cam that I used to run, kinda regret not having it anymore, it was great with power brakes and AC. However in today world I sure that there are better camshafts available but I quit following the development of camshafts when I started raising a family. Now they are middle-aged and I'm just not haven't done any research on the topic as the manufacturers have changed.

The 1 thing that I have noticed is back in the day people were willing to share information more easily and today it seems to be a much more guarded information. I think it would be nice to have a chart that would show where today offerings would compare to the old school stuff including the factory camshafts. I just don't know how to get it done.

Edit on this. The cam that I had was the JM 22-25-10 and not the 20-22.

 

Pretty sure this is supposed to happen. Are you getting specific numbers that you find alarming?

 

Warm oil is lower viscosity that cold oil. This is normal.

 

Many people think that 15 lbs at idle is too low. Olds specs is 10lbs per 1k rpm, with I believe 35 as the max. So at 750rpm 7.5 lbs meet specs. Before you rebuild your motor get a really good gauge and measure it and see if it's lower than the specs.