I just want to give a public shout out to Scott Brown at
https://www.buyracingparts.com. A while back, I had a balancer break on my mild 400 in my LeMans. It bent the crank and cracked the block, but I had an extra 400 N crank and 30 over 400 block. The motor had a .255/.262 solid cam in it that had been recommended by one of the big Pontiac shops. It made 523 hp at 5800 and 503 ft at 4900. The cam was damaged, so I reached out to Scott to get his recommendation on making the switch to a hyd roller. Due to the stock rods/heavy pistons in a 557 block, rpms was the major limiting factor. He chose a cam, we got it put together and dyno’d yesterday. The only other change was going to total seal gapless 2nd rings.z, same dyno, headers jets ect. Happy to say hp jumped from 523 to 569@5800 and torque from 503@4900 to 558@4700. The Edelbrock heads and intake are too big for this motor but they are what I have, and they really want more air. We quit pulling at 5800 and it jumped 10 full hp from 5700-5800. I’d love to be able to spin it to 6500 just to see, but normal usage will be below 5500. I’m pleasantly surprised, and extremely happy with my experience with Scott, I highly recommend him.