Here's some pic's for you guys that want to Modify for block for better oiling. Mopars main oil gallery is roughly a 9/16 bore all the way thru the block on both sides. The bad deal is every lifter passes thru each gallery meaning, you have 16 points of leakage, not including a massive leak in the # 4 main, which feds #4 cam journal, which is timed, to feed each rockershaft assy. All the holes in this late 77 440 block were a 1/4, these are the feed holes that come down from the passenger "Main" oil gallery. As you can see in the pic, #2, #3, #4, #5, are fed off of the main oil gallery. #1 is fed off the front which intersects the pass over passage that is cast into the front of the block from the oil pump pad.
The easyist way to get more oil to the bearings is to enlarge the passages from the main oil gallery to the main bearings. With a 9/32 reamer, 6" long and a 4" 1/4 arbor is what I used.* I used a 9/16 diameter stainless steel rod as a stop when drilling, so I would'nt punch a hole in the other side of the gallery.
Here's a pic of most of the lay out of the oil system. You will have to remove the main caps to drill. When you look down the main saddles, you will notice their is a passage that also feeds the cam journals. DO NOT DRILL THESE OUT
Wow thank you on the info, I needed these kind of pics so thank you very much. I am building a 383 out of a 63 Chrysler 300 I am putting in my Dart and wanting to get some high RPMS out of it so thank you alot! (Anything that I would need to watch out for when doing this to my block?)
I take it you are running a solid lifter cam? A roller? I don't prefer hydraulics after 6,500rpm. The above mods will work for either hydraulic cammed engines or solid lifter cammed engines. When I get alittle farther along, I'll point out some things just for solids. Most of these and the others you can do with some simple hand tools. Your engine, is this something that is a daily driver or weekender or strickly race, -no title on the car, -not to be street driven at all?
Very good and informative! Two questions.
1- what's a 'cold weather' block?
2- where can I get a 6" reamer like shown. (anywhere on line?) I'm very happy with the powerhouse products stuff I've bought.
I take it you are running a solid lifter cam?* A roller?* I don't prefer hydraulics after 6,500rpm.* The above mods will work for either hydraulic cammed engines or solid lifter cammed engines.* When I get alittle farther along, I'll point out some things just for solids.* Most of these and the others you can do with some simple hand tools.* Your engine, is this something that is a daily driver or weekender or strickly race, -no title on the car, -not to be street driven at all?
If these questions are toward me, which i believe so, then I would say strickly race. It will be street driven probably 2 times a year at the Cumberland car cruise ,in Maryland, in the spring and fall. Yes there is a title and like I stated, probably street driven 2 times a year. No idea on the cams but I was thinking a solid lifter cam when I get that far.
A Cold Weather block 400 was only cast between 4 April 71 to 10 Oct 71. All other's after this have smaller mains, but still bigger than any pre 75 440 or any 383 block. Maybe I should'nt have used the "cold weather" term. In the mopar world, they call these the 230 block, via the last 3 digit's of the casting number. Brandon has a better pic