1uz compression ratios

[mmbeer]

hey can anyone tell me if the difference in early / later model compression ratios is just in the piston shape ? cheers

 

[XR8tt]

From my head with out looking it up...
10 to 1 with early 1UZ...
10.5 with latter model motors..
Another reason the early engine's can take a sizable boost when blown..

 

[mmbeer]

is the difference in the heads or piston ??
cheers

 

[XR8tt]

http://www.v-eight.com/tech_forum/viewtopic.php?f=4&t=977