Boatally Insane

iTrader: (1)

I'm at 4.5" right now but my piston to wall clearance is 6 - 8 thousandths and the bore NEEDS to be cleaned up some...

Has anyone gone to 4.530"


Thanks,


Doug

Panic Button

I have 2 blocks that are .060 over, no issues so far.

PatriYacht

I'm there with Gen 5 blocks. A Gen 6 can go 4.560 most times. It helps to sonic check the block first.

Boatally Insane

iTrader: (1)

That's good to hear.. Mine is a Gen VI block....

I found a place today that can sonic check it for $100.00


Thanks,

Doug

Boatally Insane

iTrader: (1)

I got my sonic test results back..
Gen VI block currently bored to 4.5"

cylinder Frnt Out rear Inside
#1 top .278 .303 .357 .312
bottom.301 .286 .351 .465
#2 top .276 .303 .338 .315
bottom.268 .314 .330 .312
#3 top .341 .282 .228 .309
bottom.425 .280 .332 .362
#4 top .340 .278 .362 .331
bottom.355 .279 .345 .368
#5 top .360 .296 .337 .329
bottom.349 .291 .345 .393
#6 top .327 .273 .354 .326
bottom.337 .261 .442 .369
#7 top .360 .310 .281 .326
bottom.484 .342 .281 .362
#8 top .325 .248 .283 .334
bottom.327 .266 .276 .385



....never had a sonic test done before, but it definately looks like it's safe to go to 4.530"


Doug

Griff

Going .030 over is the norm. It will make it a 509ci

Boatally Insane

iTrader: (1)

It already was at .030 over.....

I'm tryin' to go .060 over..


Doug

[email protected]

Standard bore is 4.466. w/4" stroke =502CI
4.500 w/4" stroke =509CI
4.530 =516CI
4.560=523CI

H2Xmark

no problem at 60 over, i would sonic test if 60 over would not clean cylinder

Dave F

Piston to wall at .006 is perfect .008 is fine too when using a forged piston.
I also read where testing was done with hyper pistons from .003 to around .008 (if I remember right) and there was no issue with them either.
"Cleaning up" means .0005 -.001. .009 will work with good rings.

my.02