Randy,
The updated GT-40 FIA form dated 68? listed the 4,942 displacement addendum, including the 5.0L crank set (C8FE ??) and G-W heads shown in the supporting photos.
I thought that was to homologate the JWA-Gulf G-W engine for 68 / 69 seasons??
Were the JWA-Gulf G-W all dry-deck using the Cooper ring sealing system?
Did they use both 2 & 4 bolt mains block configuration?
Thanks for the details
According to JWAE chief engineer John Horsman, writing in his book Racing in the Rain, Coopers Mechanical Joints developed a head sealing system. It consisted of a seperate compressible ring inconjunction with an Aero Permanite backing gasket sealing the water passages. Horsman also comments that combustion gasses entering the coolant was an Achilles' heel of the 289 when it was raced at Reims in 1964. As a side note, Horsman adds that in the 1965 season 289 engines continued failing. Ford's tear down report noted that the failures were a complete surprise. Head sealing issues were traced to head bolts stretching.
The ring was designed to fit in a 0.060-0.062-in deep groove machined in the deck face.
During the 1968 season, Ford engine department was working on head gasket failures. Engineer Don Sullivan, along with Don Coleman were involved. Water passenges were sealed off and external pipes carried coolant to the heads. This configuration was used on the Trans-Am cars.
According to Horsman, they put the arm on Wyer to use this system. For Watkins Glen, two engines were built. One had Cooper rings (number 67/18) and the other was dry-deck (number 67/11).
Horsman wasn't keen on the dry deck sealing noting that he had no gasket failures with the Gurney-Weslake heads with Cooper rings. Ironically a dry deck configuration was used in the 1968 Le Mans winning car. It was trouble free partly, he explains, because the race was run in September when it was cooler. Finally at the 1969 Daytona 24 Hours, both dry deck engine blocks cracked.
As for the main cap question, when Ford sold their interest in Ford Advanced Vehicles (which became JWAE) they included 50 Windsor blocks with four bolts on the 2-3-4 mains.