Stock EJ257/EJ255 Internal Specs

Silverevlis · 01-02-2021, 01:16 AM

Has anyone found any Subaru literature that lists the stock specs for:

EJ257 Piston Dish Ccs

EJ255 (Most recent version, not renamed EJ257) Piston Dish Ccs

W Casting Heads Ccs

D Casting Heads Ccs

Oem Head Gasket Bore

Oem Head Gasket Crushed Thickness

Piston to Deck Clearance

Oem Rod Length

Subaru does not list these specs in the FSM, and while countless people (Myself included) have CC'd the heads and pistons, I have never seen a definitive spec sheet from Subaru. If anyone has access to this I would be super appreciative if you could share.

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Jp925 · 01-02-2021, 01:41 AM

https://www.flatironstuning.com/blog/what-is-the-difference-between-an-ej255-and-an-ej257

This isn’t everything, but it covers a lot of it.

Silverevlis · 01-02-2021, 02:24 AM

Quote:

Originally Posted by Jp925

https://www.flatironstuning.com/blog/what-is-the-difference-between-an-ej255-and-an-ej257

This isn’t everything, but it covers a lot of it.

Thanks, Ive read that article and am a huge fan of the Flatirons crew but their measurements are also performed in house and not based on Subaru literature

spoolinsti05 · 01-02-2021, 04:09 AM

I believe all 2.5l gaskets are 100mm

Silverevlis · 01-02-2021, 11:55 AM

Quote:

Originally Posted by spoolinsti05

I believe all 2.5l gaskets are 100mm

Where have you found this information?

01-02-2021, 01:16 AM	#1
Silverevlis Scooby Newbie Member#: 519059 Join Date: Oct 2020	Stock EJ257/EJ255 Internal Specs Has anyone found any Subaru literature that lists the stock specs for: EJ257 Piston Dish Ccs EJ255 (Most recent version, not renamed EJ257) Piston Dish Ccs W Casting Heads Ccs D Casting Heads Ccs Oem Head Gasket Bore Oem Head Gasket Crushed Thickness Piston to Deck Clearance Oem Rod Length Subaru does not list these specs in the FSM, and while countless people (Myself included) have CC'd the heads and pistons, I have never seen a definitive spec sheet from Subaru. If anyone has access to this I would be super appreciative if you could share. * Registered users of the site do not see these ads.

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01-02-2021, 01:41 AM	#2
Jp925 Scooby Newbie Member#: 510046 Join Date: Dec 2019	https://www.flatironstuning.com/blog/what-is-the-difference-between-an-ej255-and-an-ej257 This isn’t everything, but it covers a lot of it.

01-02-2021, 04:09 AM	#4
spoolinsti05 Scooby Guru Member#: 108051 Join Date: Feb 2006 Chapter/Region: Tri-State Location: NY Vehicle: 2005 TickingTimeBomb Jr tuned TT Sleeved	I believe all 2.5l gaskets are 100mm