Confused about piston standard

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09-28-2009, 10:28 PM

thetremendousti

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Confused about piston standard

Okay so the FSM for the L28et says the standard bore is 86.0 mm to 86.050 mm. Do other companies have their own standard as compared to the factorys?

pistons

according to ITM it says standard bore is 86.1mm but isn't that almost a .020" overbore? Could it be a fatal typo?

09-28-2009, 10:36 PM

BlueKitsune

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Um did you try asking the seller that?

Honestly I dont see why you dont go just 1mm bigger or something simpler

09-29-2009, 12:54 AM

skib

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89!!!

09-29-2009, 01:34 AM

FubarI33t

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89 is what i am goin too. maby larger. And alot of times asking on here will get a faster better answer then the company can. is that not why were here?

09-29-2009, 01:37 AM

skib

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Quote:

Originally Posted by FubarI33t

89 is what i am goin too. maby larger. And alot of times asking on here will get a faster better answer then the company can. is that not why were here?

for what reasons would you be going larger than 89mm?

09-29-2009, 06:14 AM

FubarI33t

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lol... i'll never tell

09-30-2009, 06:32 AM

Warren

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The ONLY reason you'd go over 89mm in piston diameter is to ruin an otherwise perfectly salvageable block. You'll find out what I'm talking about when/if you really do it.

09-30-2009, 02:16 PM

hoov100

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Quote:

Originally Posted by Warren

The ONLY reason you'd go over 89mm in piston diameter is to ruin an otherwise perfectly salvageable block. You'll find out what I'm talking about when/if you really do it.

I had a friends f54 blocked bumped out to 89 and their is still some room to bump hone a couple more times, plus isnt 89mm the standard bore for a 3L stroker?

09-30-2009, 05:49 PM

FubarI33t

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it is. also there's a L block that can take more.

09-30-2009, 06:31 PM

#10

BlueKitsune

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the LD28!

09-30-2009, 09:40 PM

#11

PurePontiacKid

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86.5mm is .020" overbore

09-30-2009, 09:57 PM

#12

thetremendousti

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well i got 86.1 so maybe i'll just hone the cylinders and pop them in, if they're too small then who wants to buy some new pistons? if they're too large then no biggie (intended) i'll bore it out

09-30-2009, 10:11 PM

#13

hoov100

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Quote:

Originally Posted by Warren

The ONLY reason you'd go over 89mm in piston diameter is to ruin an otherwise perfectly salvageable block. You'll find out what I'm talking about when/if you really do it.

ahh, I fail, i didnt see the word "over" in that first line.