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Old 01-10-2004, 02:00 AM   #1
Kostamojen
Scooby Guru
 
Member#: 2272
Join Date: Sep 2000
Chapter/Region: BAIC
Location: Fire Caves
Vehicle:
2018 Type-RA 196/500
1999 OBS Camo Wagon

Exclamation The Legendary EJ20 heads on an EJ18 block experiment

So yes, today I tried them out. Took apart a ej18 left over at EddyRS's house and tested how the EJ20 heads will work with it. Good learning experience for me, and heres what I learned:

A) The EJ18 heads suck. They have far smaller intake holes, and inky dinky ports and valves...

B) Everything bolts up perfect. The headgaskets from the EJ20 head work perfect on the EJ18 block, and allow the coolant channels to get through properly. And on a side note, the ej18 head channels are far smaller than the ej20 (no surprize). Even the coolant aluminum channel on top uses the same bolt locations as the ej18 one...

C) Despite the fact that everything bolts up fine, there is a serious problem. The valves. The EJ20 valves are so much larger, and spaced so differently that they will most definatly hit the EJ18 pistons at the valve relief cuts in the piston This means that aftermarket pistons will be required for the EJ20 heads to work with the EJ18

Here are some pics:

http://community.webshots.com/album/110209915vXVzdU

If anyone has any questions or comments, feel free to post.
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