1G 7-bolt, what pistons fit?

[Littlebeeper]

Well a damn valve broke at the stem and ate up my piston and head a little. The head is getting fixed but the piston is gone. I have no damage to the block, which is a good thing since it was recently rebuilt, but i need to replace the piston. I want to get the piston replaced but being a 1Gb 7-bolt, will any 1G piston work? Even one off of a 6-bolt without maching the rods. I just want a replacement piston i can take to the machine shop and get it pressed on to me rod without throwing off the compression on a cylinder. Sucks to have the late 92-94 cars, when they need fixing i did a search and found a lot of piston face differences as far as some having an arrow to the timing belt side and such, and just want a clear answer to wether they will fit and are the same compression.

 

[4pistons]

Does it look like this??!!

 

[4pistons]

All the 4G63's use the same bore so that's not an issue. I think all the 1G's had the same compression. I don't know when they changed the pin diameter, was it for the 7 bolt or for the 2G?

One way to find out is to have a dealer look up the part number for a '91 and then a '94 to see if they are the same. Why don't you just order the one for your engine/year and not worry about it?

Rick - '91 GSX

 

[Littlebeeper]

looks almost like that. i didn't get it to go all the way through though so from i see the pin may have changed from early '92 (6-bolt) to the late '92 (7-bolt). hey if they are the same i'll take 1 of the other 3 that are still good