taps

i have a new dart big m billet cap block i am starting to assemble but i noticed a slight mis alignment between the rear main bearing oil hole and block.called dart they said it would not be a problem,has anyone out there run into this and what do you think?

bbchevy

Mine was the SAME Way,Until I took a Carbide Cutter and Chanferred it!
Later
G 8)

hink

Here is a list of things that need to be checked before and assembley work is done and the Dist. should not be over looked!!

Some block notes:
I deck all of them to a finished number depending on gasket & desired piston height
Block needs to be honed with a plate or bored & honed depending on bore
Bottoms of bores need to be chamfered
Most need the lifter bores honed, at the least checked
Most need line honing
All pipe threads need to be retapped
Oil return from fuel pump cavity needs to be done
Core plug holes need deburiing
CHECK THAT THE DISTRIBUTOR GEAR DOES NOT CONTACT THE BLOCK BY THE CAM. There is a big cast blob down there you may want to relieve.
You can machine the gear to clear if you forget but it is nicer to fix the block if necessary
Check all the timing bolt holes with air, some may go into water. Same with the motor mount bolts

tcarda

Thanks. I have a new Dart Big M block too with billet caps still in the crate and I was wondering the same thing.

chevyfireball

All that's worth writing down. Thanks.

swany388

One thing that I came across was the oil drain back holes in the heads need to be check. We have Dart heads and a Dart block and the drain holes in the heads were blocked by the block.