pickup tube I.D questions???

[6 packin]

So the hemis and 6 packs come with this 1/2 pickup tube diameter.... Was there any differance in the passage holes were the oil flows? I see no point going to a 1/2 from a 3/8? After all the pickup tube itself will flow more but still travels through the same bottle neck right? This restriction loss can never be gained back.....fact. even if flowing to a 1 inch hole from a 3/4 tube. still the loss is evadent?????????

[Slant Cecil]

Only the HEMIs and I think the MAX WEDGEs were 1/2''. 440s are 3/8". The restriction is the tube. The passages in the block to the pump are 5/8" or larger. When you drill the block for a 1/2" pick up, the boss around the hole will get thinner. I always take a die grinder and grind the threads opposite of where the thin spot will be. This moves the center of the new hole back when drilling leaving more boss area around the tube. The off center hole will still line up with the passages to the oil pump. Of course a deburring of the passage is still needed. This also gives a slight more tube to crank clearance if using a stroker.

Cecil

[dirty dan]

Oil pumps were designed to push oil .
The suction side of the pump is weak in design.
Any and every thing you can do to aid the pump to feed its self will make a big differance.