B16a pistons help?

[angie_16-08]

Can i safely use 84.5 mm pistons with a 10.8.1 compression ratio in my stock b16a block

[2000GSRtypeR]

Sorry but you can not bore a B16 to 84.5mm unless it is sleeved.

[angie_16-08]

so wats safe to go on the stock block?

[2000GSRtypeR]

81.5mm

[angie_16-08]

can i still run the same compression ratio with a gsr head with supertech valves and retainers with itr cams? sorry for so many questions bro

[2000GSRtypeR]

Yes you can run 10.8 to 1 compression but a GSR head usually will bump it up another .2 because of the combustion chambers are smaller which will result in 11 to 1 compression. Also it depends on if the head has ever been decked and how much was taken off the head.

[2000GSRtypeR]

Also if the Supertech valves are flat faced instead of being domed like stock valves that will also raise the compression.

[angie_16-08]

the head is stock size! only thing being done to it is valves springs retainers and cams

[2000GSRtypeR]

I understand the head is "stock" size but has it ever been decked? You have nothing to worry about anyways because as long as you are staying under 13 to 1 compression and have a good tuner you will be able to use 93 octane pump gas and you will not have to worry about using race gas.

[angie_16-08]

alright man thanks alot!!!BIG BUMP to 2000GSRtypeR for all the help and advice thanks man