EJ25d Head Questions

Heads, valves, pistons, rods, crankshaft, etc...

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91legacyawdturbo
Second Gear
Posts: 322
Joined: Sat Mar 03, 2007 8:10 am
Location: arvada co

EJ25d Head Questions

Post by 91legacyawdturbo »

So I have a set of 98-99 ej25d heads, I'm trying to find out what valves, springs and cams that I can use.
The goal is 8k rpm (just a wish) I know that the version 4 parts will fit but where to go for the parts
here in the states. Are the my02-03 usdm wrx valves and springs transferable? I know the cams aren't due to the bearing design. Anyhelp would be appreciated.
91 SS, v9 ej207 twin scroll swap, Gda wrx dash swap.
2002 wrx sport wagon
PhyrraM
Fourth Gear
Posts: 1980
Joined: Thu Aug 11, 2005 4:34 pm
Location: Lake Elsinore, CA

Re: EJ25d Head Questions

Post by PhyrraM »

USDM WRX stuff is a no go. Larger base circle on the came means it has shorter valves.

Aftermarket or EJ20K stuff is what you need. Head to the Pre 2002 factory forced induction thread on NastyCock (NASIOC). A few of the regulars over there can be trusted.
'93 Winestone SS Auto, '91 Pearl White SS.
'93 Pure White SS EJ20G slanty intercooled, SIDESWIPED! In stasis.
'94 FWD and '95 AWD Laguna Blue SVXs.
2017 Pure Red BRZ Limited w/Performance pack
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