Quote: i also have a 440 with the 2266 pistons and also at the time didnt know any better.they were the pistons that PAW sold at the time, so thats what i got.little did i know that i would only have about 8.5 comp. even so it has ran well (12.35) for a cheap 906 head hydraulic cam engine. on the other hand...im not sure about the 2388. i think that is a 72-78 replacement piston but forged. i would think it would be more like .110+ down in the hole unless the block was decked a bunch.seems like that might put compression down in the 7s even with the smaller chamber.
I've been told the 2388's are just an older version of the 2266 - 1.991 compression height, no valve reliefs. Should sit .08-.1 in the hole.
