PT70 or 45a

[Double-L]

I went 10.57@127mph with that 66 P-Trim ball bearing turbo at 25lbs of boost and 26 degrees of timing/3600lb car with me in it..off the foot brake....spools great, drove it in a rarely driven street car...you will love it with your combo... your heads are better, my cam was a hair bigger (no big deal). I had a 19930 3500 stall AC non Lock Converter. I think you made a good choice, wait until you rip it

You may want to start thinking about double pumpers, just to be safe.

I thought the 70 when you got it spooled up really pulled but the ball bearings is a new ball game, Almost reminds me of a super charger the way it keeps wanting to spool, On the road it feels like a 100% stock car till you get in the gas, By the way that is the same boost and timing chip I had for the 70 and it works like it was made for the 66

 

[Epitome]

There is no doubt that once spooled, ball bearing or not, the 70 will make more power. However thr drieability AND power available with that 66 is awesome.