|
By carl - 18 Years Ago
|
|
I was in a junk yard today that had a 57 mercury with a 312 engine.the owner told me that the 57 merc. had a higher rocker arm ratio than the 57 ford which is 1.54.but didnt know what it was.i thought 1.54 was the highest for a stock y block.i didnt take the valve cover off to check for part number.any opinions on this carl
|
|
By Glen Henderson - 18 Years Ago
|
|
I think that all 312's had 1.54's, I have one that I pulled out of a 63 Ford 1 1/2 ton log truck with Merc valve covers that has 1.54 ratio. Of course this engine had been swaped into the old pulpwood truck at sometime. The block was no good (cracked), but I got a decent set of G heads from it
|
|
By Hoosier Hurricane - 18 Years Ago
|
|
The rocker arm history is this; '54-55, 1.43 with slotted adjustment screws and locknuts. '56, 1.54 with slotted screws and locknuts. '57, 1.54 with self locking adjusting screws, '58 and later, 1.43 with self adjusting screws. Mercs had the same arms as Fords each year. Cubic inches had no bearing on the rocker ratios, only the year of manufacture. John
|