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Old 03-12-2021, 02:53 AM   #1
Mymomsoutbackxt
Scooby Newbie
 
Member#: 522441
Join Date: Feb 2021
Location: SLC, UT
Vehicle:
2007 OBXT
Pearl White

Cool Forged Pistons, Brand New Block, Rehone?

Got a brand new, never ran Type RA block fresh out the factory. Planning on replacing pistons with Manley 99.5mm forged pistons. Read some forums with people saying I'd need to rehone due to expansion, and others saying they just dropped 'em right in with no issues.



So I thought I'd ask NASIOC for help.
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Old 03-12-2021, 10:35 AM   #2
Jedi03
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Member#: 491095
Join Date: Sep 2018
Chapter/Region: SWIC
Location: New Mexico
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2009 STi Blue
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realistically a measure for expansion is best, but they are designed to be "drop in" ready, just make sure you get the correct a/b bore
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Old 04-17-2021, 04:53 PM   #3
pcampbell
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Join Date: Jan 2016
Location: VT
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2005 2.5 SC OB

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There is a lot of talk that the PTW is too big on the Manley drop ins. But I would like to see someone who has actually measured them and report the PTW.

IAG after all uses JE drop in pistons in their stage 1 block which uses factory bores , so it must be possible to get this right.
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