Quote Originally Posted by escorthvn View Post
Hi all, I have been watching this posting with interest as I own a Mk2 Escort with a YB Cosworth. My understanding is that the YB was not designed until about 1983/84 but Ford built engines in 1973/74 period with 16 valve heads based on the pinto cortina 2 litre block. I was in England in 2007 and took many photos of this car with a 16 valve 2 litre cortina engine. I have many detailed photos of the casting nos. and engine nos. on this engine. RS2000 Mk1 Escorts were homologated with a 16 valve 2 litre engine. Looking at the homologation papers the photos of the head look very similar to a YB head. My understanding is that these heads are Holbay heads.
Pete
The Holbay head is homologated for the RS2000 as a Group 2 option, Homologation paper #5566 amendment 5/5V dated 1/9/74. These heads are no longer being produced and in the UK thay have allowed the Warrior head which is a copy of the Holbay version, to be fitted as a replacement option.

My information is that the YB head as we know it now is not the head that was produced as the initial Cosworth Head for the Pinto / Cosworth block pre early / mid 1987

And yes Crunch, I did question as to how that particular car the Bruce refers to came to have a COD and the response was that it was believed that someone was racing one in that configaration in the UK around 1985/86.