Originally Posted by Double_v23
Can anyone tell me what normal interference between the cam bearings and block is supposed to be?
When you install cam bearings do you line up the oil holes directly or just let the groove do its' thing.
What do you run for clearance between the cam journals and bearings for...
1. a race motor with 5w30 and high pressure pump 254 dur @ .050 .510 lift
2. a street motor with 10w30 and stock pump 212 dur @ .050 .450 lift
3. a street strip motor 10w30 with high volume high pressure 230 dur .488 lift
all hydraulic cams.
Depending on the journal diameters as most have a differance of .002 from low to high avaerage press is .004 to .006
On the bearing we put in we install at 3:30 O'clock and the ACL's we use are a split bearing and with the split at 12:00 the holes end up at appox. 3:30
Take the time to measure the jouranls of a block as it can be scary on some blocks as we find alot of taper and over size jounals in alot of them, Thats why bearing sometimes show alot of wear only on one side and not the other.
As far as oil clearance your mains and rods and lifter bore clearance will play a big part of what weight oil to run. And a oil with plenty of zinc and phosephate would be a good choice.