Cylinder head casting number

cre · 01-17-2012, 03:47 AM

There are over a dozen revisions of the 7M head and they're nothing to do with the particular model or which cams it came with. The head (as well as the block) were continuously upgraded through the 7M's lifetime... Improvements may have been subtle changes for easier production or minor tweaks for easier emissions compliance; Changes for more power are possible but unlikely or completely insignificant.

The only reason I see to change from one head to a later number is age... the later number is the newer and as such less likely to have softened.

There are a few locations for revision numbers, I can't remember which is which. There's a mold identifier and a casting revision number. One you'll find on the intake side above the ports and the other is behind the upper, rear timing belt cover..... If I remember correctly.

Here's a 'tiny' bit more info: http://www.supramania.com/forums/sho...casting+number Just a couple pictures and speculation.

01-17-2012, 03:47 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	There are over a dozen revisions of the 7M head and they're nothing to do with the particular model or which cams it came with. The head (as well as the block) were continuously upgraded through the 7M's lifetime... Improvements may have been subtle changes for easier production or minor tweaks for easier emissions compliance; Changes for more power are possible but unlikely or completely insignificant. The only reason I see to change from one head to a later number is age... the later number is the newer and as such less likely to have softened. There are a few locations for revision numbers, I can't remember which is which. There's a mold identifier and a casting revision number. One you'll find on the intake side above the ports and the other is behind the upper, rear timing belt cover..... If I remember correctly. Here's a 'tiny' bit more info: http://www.supramania.com/forums/sho...casting+number Just a couple pictures and speculation. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> Last edited by cre; 01-17-2012 at 06:06 AM.