I had a similar problem when I rebuilt my 292 engine last summer.  I installed an Isky 301333 cam in my engine with a Rollmaster timing set.  The 301333 cam has a little more lift and duration than the 301444.   After installing the cam I found I didn't have enough cam end play.  It's .suppose to be .005", so it's not much.  When I tightened everything up the engine would turn with a wrench, but it was obviously not right. The problem turned out to be the thrust washer.  It seems like there were a couple of different thickness Y-Block thrust washers.   I ended up taking the washers out of a good engine I had in my shop.  I installed the cam without the timing chain and checked the cam end play with a dial indicator and it was perfect.  It took me a week to figure all this out.   The engine has been running for a year now and all is good.  I have also seen Y-Blocks where the new cam bearings were too tight.  I had that problem once and had to scrape the bearings.

Got it, there was a nick in the original counter weight that exposed a small nib of metal - once taken off got got spacing to 003 and all turns well.  Would like 006, so does anyone know where to buy beveled spacers as I could not find any online ...thanks for responses

" ... where to buy beveled spacers as I could not find any online ...thanks for responses"

JOHN MUMMERT offers new on his website.       

____________________________

The only counterweight, on engines so equipped, is the fuel pump eccentric counterweight.  Most have a  spacer, instead of the counterweight.  That has nothing to do with the cam thrust.  They are items 6290.  What you need is a 6265 that is .006 thicker than 6269.




Lawrenceville, GA

Got it.  Had a small nick on inside of counter weight that when tightened did not allow cam to turn.  Once sanded off was able to get 3 on the back lash.  Book said 1 -12 with 6 ideal.  Does anyone know where to pick up the inner beveled spacers so that I can get to the ideal 6 backlash?  Thanks all for the help, appreciated