I have used the same rotating assembly for many years and just got a call yesterday that the rod journal is hitting the bottom of the bore on at least one cylinder, maybe more, on this block. I never had this problem before. It is a standard steel crank with Eagle rods and I have used this same set up in at least 3 blocks without this problem------any thoughts?????

 

455 blocks have more relief cast into them than 425 blocks. Are you using stock stroke? Are these rods the same as previously used?

 

I was told there could be a problem with the Eagle rods and some blocks...I had mine checked when it was assembled and the relief notch on the bottoms have to be made,Sucks but Eagle rods are thicker than stock ones,Hopefully your shop can clearance them with minimal effort or extra cost.......

 

Does it really suck?

The Eagle rods are som much better than the stockers it's not even funny.

Yes some blocks have to be clearenced because the bolt is actually longer and the rod cross section is wider, but that's a good thing.

 

Had same problem with my build. 71 455 block, stock crank, eagle rods. All bores had to be notched.

 

to me the solution ifs obvious
remove the offending section of the bore lower end.

 

First of all the "notching" has been completed and whatever needs to be done to finish it off will be finished today and tomorrow and I can pick it up Monday.......It is a stock stroke motor. I have 2 identical motors and have never ran into this problem before. The one I had up there getting freshened up had a crack in one of the bores so I took them another block. The replacement one was an "F" block used from 68 to 72 and was in fact a 68 block. The other 2 are "Fa" which is 72 to 76. Maybe that was the difference but I had never had, or heard, of this problem in stock stroke motors......Anyway thanks to everyone for their replies.

 

The blocks vary in clearance at the bottom of the bore and should always be checked when using aftermarket rods. Slight interference isn't all that unusual and it just takes a little touch up with a die grinder to fix. No big deal.

I had someone question why my '67 425 had the J&S girdle notched when they're made to fit a BBO. Mine had a longer-stroke 455 crank and CAT rods in it and needed a little notch here & there.

 

I had to notch my 455 block for Eagle rods.

 

It does when you don't catch it till the motor is together!

Might be one of those "Friday casting" Were things are not quite right cuz it FRIDAY! lol