Originally Posted by oldandtired
Since you have to pay for the set up and boring job, why not spring for the roller bearings?
Going the roller bearing with a 2.250 cam tunnel is really no gain as your using a STD. jouranl cam at that size and going to a 55MM roller cam bearing will most likely get you into the water jacket when reqrooving the oil grooves behind the cam bearings.
The more common size we do on the OEM blocks is go to the BBC cam tunnel which is .021 smaller then the 50MM cam journal and there is more power to be made with a babbit bearing over using roller cam bearings.