need a piston part # guru

I have a 75' 440 that has been bored to .030 over.

I also have a new set of cast pistons,flat topp's no valve relives cut in them.

they sit at.018 below the deck at t.d.c.

the p/n stamped on top say 2286p .030
I bought these some time back with none of the packing/ boxing etc.
can anyone cross thease pistons like brand,or details such as compression hight etc.

I would like to use them in my 440 since I have them allready have them....please need adice.

wino!

it is a sealed power piston..

on nhra list of stock pistons..

says 1.94 for compression height.

Thank you 70aar!

Something's wrong, with a piston compression height of 1.94" the piston should be down in the hole at least .140". Could the .018" be .180"? (decimal point)

The method I used was to put a straight edge across the cylinder resting on the block deck and used a feeler gage to check the piston at t.d.c.

feeler gauge was .018

the piston comes up to almost flush to the deck minus a gap from a feeler gauge of .018

is this correct?

A straight edge & feeler gauges will get you VERY close. 3.75 stroke(divided by 2)is 1.875". An RB rod is 6.768" & your CH of 1.94 gives 10.583 would be .142" in the hole with an advertized (RB)deck height of ~10.725". Whats been altered here.

so if i undestand corrcetly this bock has been decked quite abit. will this piston / block combo work on a uluminum headed eng. be ok?

maybe the compression height is wrong.

it is in a list of acceptable pistons...and all say 1.94 compression height...

It would appear to be though thats an ungodly amt to have been milled from a deck. The stroke & rod length doesn't vary too much & if that is the actual CH of those pistons then there's nothing else. Yes with .018" in the hole & the right gasket you can end up with excellent quench for your aluminum heads but stay on top of what your CR will end up being & enough valve/piston clearance.

here is a copy of the excel file from nhra..scroll down to find the 440 list..

google does not bring up anything on sealed power 2286p.

need to find someone with an old sealed power catalong...

n

The L2286P is the original forged NHRA replacement piston for the 68-69 440. It has a 2.034" CD

Same piston? I don't know.

You still need to cut the deck a bit to get a 0.018". Probably a 0.030" to 0.040" cut.