90 Heads and IH's on our 91 [Archive] - ZR-1 Net Registry Forums

View Full Version : 90 Heads and IH's on our 91

Shrek

01-04-2012, 11:37 AM

Based on photos in this thread http://www.zr1.net/forum/showthread.php?t=13414&highlight=valve The heads and IH's on my wife's Z are 1990 style.

http://i446.photobucket.com/albums/qq186/2manyvettes24/91%20ZR-1/DSCN1366.jpg
http://i446.photobucket.com/albums/qq186/2manyvettes24/91%20ZR-1/DSCN1365.jpg

sammy

01-04-2012, 12:08 PM

did the previous owner have the inj housings and plenum ported?????

Shrek

01-04-2012, 12:11 PM

did the previous owner have the inj housings and plenum ported?????

NOPE! She was a virgin when I cracked her open for injectors last year.

A26B

01-04-2012, 02:52 PM

That's not particulary surprising, knowing the story behind the change. It was essentially a change to reduce machining and therefore cost. There was probably an inventory of engines already at BG when the change was implemented at Mercury.