Do all 451 stroker pistons used with a 440 rod have the oil control ring partially into the wrist pin hole??

No. None of them should. The 451 with the 440 rod uses a piston with 1.32 compression height. Plenty of space between the pin and the oil ring.

Not a problem either way.

a 451 doesn't but a 496 does.

We're talkin in a 400 block

as mentioned none of them should, normally a 471 and above using a RB rod will be in the oil ring

1.12 compression height pistons require an oil ring support rail, 400/498. 400/451 use a 1.32 ch piston and work like anything else.

Some info from Muscle Motors on their stroker kits for 400 blocks.


400 Kits

400/451”: 3.75 stroke x 6.76 rod, 4.375 bore 1.320 CH piston.

One of the original stroker kits for big block Mopars. These kits are noting more than a 440 built with a really light piston. 3.75 x 6.76 (440 stroke and rod) but because the block is 3/4”shorter, the piston is ¾” shorter and literally ½ the weight.


400/470”: 3.91 stroke x 6.700 rod, 4.375 bore 1.320 CH piston.

This is one of those kits that works better than it should. When using stock port window cylinder heads (factory, Edelrock RPM, Stage VI) this is the PERFECT combination. Good amout of cubes, super lite weight rotating assembly, great rod ratio, just a dynamite combo.



400/511”: 4.25 stroke x 6.535 rod, 4.375 bore 1.320 CH piston.

This combo has a piston with a 1.320 compression height. What that all means is that it stops the piston at zero deck on an unmachined block.