high compression egge pistons for 273

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housecat

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i am rebuilding a 1967 high performance plymouth 273. everything checks out that it is the hp version. when i took the old pistons out they were the flat top standard non hp pistons. the engine had been rebuilt at some point and bored .030 over, it does not look like any of the decks were shaved or any other machining. i ordered egge high compression pistons they are called an irregular dome. the possible issue is that at tdc without gasket on just the domed part of the piston ( horizontal above the wrist pin) sticks out of the block about .060. i called egge and a machine shop and they did not think that sounded right. either the pistons are ground wrong or that is how it was supposed to be from the factory. i know i could put flat top low compression pistons back in it, but i want it to be original as intended. any thoughts besides just to put a different motor in it, the whole car is original and i want to keep it that way.
 
I have those pistons in my 273 and I don't remember them sticking above the deck. I will have to look at my build thread photos to check it out. I know I went with .040 over and checked my valve to piston clearance and I had a lot of clearance with a commando/spec cam.
 
They're fine. Yes the domes are above the deck surface. I wish I would have taken some different pictures.

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DesertRat said:
I have those pistons in my 273 and I don't remember them sticking above the deck. I will have to look at my build thread photos to check it out. I know I went with .040 over and checked my valve to piston clearance and I had a lot of clearance with a commando/spec cam.
Click to expand...
thank you for the info, i will check clearance when i get the heads back
 
Left is always driver side. Mopar part numbers play the same game. Odd numbers on the left, iirc
 
housecat said:
i am rebuilding a 1967 high performance plymouth 273. everything checks out that it is the hp version. when i took the old pistons out they were the flat top standard non hp pistons. the engine had been rebuilt at some point and bored .030 over, it does not look like any of the decks were shaved or any other machining. i ordered egge high compression pistons they are called an irregular dome. the possible issue is that at tdc without gasket on just the domed part of the piston ( horizontal above the wrist pin) sticks out of the block about .060. i called egge and a machine shop and they did not think that sounded right. either the pistons are ground wrong or that is how it was supposed to be from the factory. i know i could put flat top low compression pistons back in it, but i want it to be original as intended. any thoughts besides just to put a different motor in it, the whole car is original and i want to keep it that way.
Click to expand...

Check the rods. Could be 6.125 rods or other aftermarket rods
 
information, the original deck hgts are, min .095 to .129 above the deck. this dome hgts, the flat is .011 down below deck. this from factory specs.
 
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