360 main cap questions

-
HuntedDuckV351

HuntedDuckV351

Well-Known Member
Joined
Jun 29, 2023
Messages
137
Reaction score
163
Location
Ohio
I have 360 block I'm doing for a new race motor. Got the lifter bores bushed and sonic checked the block and bore came out great. So now I was checking over the main caps and 1 and 5 are good and go in.the register "normal". Has about 2 thou interference with a set of calipers. 2,3 and 4 csps aren't as tight fitting in the register more like .0005-.001 interference. I can take the cap and push it in by hand. I did take a indicator with just the cap sitting in the register and moved it side to side and got no movement. What's your thoughts? I donhave a brand new set of MP 4 bolt caps i can cut down as a standard 2 bolt cap?
 
How did you have all that work done without using the mains as a locating factor. Square deck, cam tunnel,Lifter bores and deck height should all go off the mains and cam tunnel.
 
Oldmanmopar said:
How did you have all that work done without using the mains as a locating factor. Square deck, cam tunnel,Lifter bores and deck height should all go off the mains and cam tunnel.
Click to expand...
Only had the lifter bores bushed. Haven't done any other machining. Just never thought to check them. Someone gave me this block. I sonic checked it first to make sure it was good then dropped it off to have lifter bores bushed along with a 340 for my son.
 
Part of the reason for bushing the lifter bores is to put them in the correct location. This is done using the Mains the deck and the cam tunnel.

100_0149.JPG


100_0150.JPG


100_0159.JPG


100_0160.JPG


100_0161.JPG
 
It's not uncommon for machine shops to take a flat punch and tap down where the caps and registers meet to tighten up the cap fitment when a block is align honed. Sounds like it might help yours out if you planned that operation for your block....
 
You can take a flat chisel, grind the nose so that its round, and GENTLY work the metal of the block to tighten the registers. You really should have it line honed afterwards
 
You must log in or register to reply here.
-

Back
Top