Well i have 3000 mi on my 355 and decided to do a cam swap and put thinner headgaskets to bump the compression and swap springs.Being i pulled the motor out to do it i pulled the pan to look everything over ive had a little noise like piston slap or something because my machinist made the bore a little loose for the forged pistons using nitrous.Everything looked ok i have a SCAT crank and SCAT I beam rods my thrust endplay was .011 on the crank and my rods are .019 seemed a little loose to me i dunno if SCAT adds a little extra clearence on thier stuff.I am running a high pressure 10% volume over stock Melling premium series oil pump with great oil pressure.Do you guys think my end clearence is ok??

 

It's out of spec. The rod clearance will be fine.

 

I put one together with about .028 rod side clearance;been a while. 383 with a crank scraper,no windage tray. didn't seem to be a problem.

 

so whats out of spec the crank thrust??

 

crank thrust does seem like it is a little high

 

.002-.007

 

Well i pulled the rear cap and the thrust is starting to wear guess i caught it before it screwed up my crank no maetal at all in the pan.Its wearing on the side that that if i was to engage my clutch.All im running is a Centerforce Clutch i was going to put a new bearing in the back i pulled other caps and everything looks great.I was going to file a small chamfer to oil the thrust on the side that is wearing what do you guys think why this started to happen i set the thrust correctly 10-15 ft lbs and smack the crank one way and then the other with a soft hammer then tourqed it to spec.Any ideas???

 

way late, but, that is useually from excessive force foward, i.e the pushing on the clutch pedal and transfering the force t the bearing. The auto tranny blew out 2 of them on two differant cheokee stroker engines i put in the truck, one was at 20k when she went and the other was at 3k when she went. Seems the auto trans fas fubared and putting preasure on the bearings somehow. I have researched it a little and not much is said about fixing it other than doing what you said to get more oil back there.

Let me know what you have heard, thanks

 

Is the wear even or uneven for the top & bottom? Cause if they don't cut the cap perpendicular & flat, it ***** the thrust bearing and you may have good clearance for assembly, then it will wear itself flat and make clearance. 6 speeds can be hard on them anyway, automatics - it helps if you have the billet anti-balloning plate in the converter so it doesn't make pressure against the thrust bearing by shoving the crank forward.