Whats the difference between the C90Z-6269-A and C50Z-6269-D plates?
I see in my ford parts and illustration guide it lists C90Z-6269-A as fitting 80 - 84 302`s and the C50Z-6269-D plates as fitting '85 and up.
I opted for the C50Z-6269-D as I will be using a '85 and up roller block but someone mentioned to me the little dog ears on the C90Z-6269-A plate might possibly hold plugs in place to prevent them from popping out. Sure enough some photos of short blocks I looked up shows a cup plug that the plate would hold in.
Im curious about this because based off how ford did their codes the C90Z-6269-A plate is a 1969 design and the C50Z-6269-D is a 1965 design. To me it seems odd that a newer design plate would have the ears but yet Ford went back to the older style without said ears for '85 and up 302s.
I don't think they are anything different, I think they are both cast iron which is proper for my application as my roller cam is a steel cam but the cam gear on the timing set is cast iron which makes the setup no different than an OE roller 302. Im just questioning on this ear aspect, I don't think it makes a different as Ford performance sells these same plates in cast iron and steel and they are exact copies of the C50Z-6269-D design that I have that doesn't have the dog ears.
I think your part number is messed up. First letter of the part number indicates the decade the part is for, and the number following it is the year in that decade. C9 would be 1969, C5 would be 1965. E5 would be 1985.
C = 60's
D = 70's
E = 80's
F = 90's
As for the technical part, iron and steel do not play well together. An iron cam needs an iron retaining plate, and a steel cam needs steel. If you have a steel roller cam, you need the later steel plate. An early cam requires the iron plate.
I tried to use an early iron cam retaining plate with a billet steel timing chain gear in the past, and the plate and gear kept getting eaten up. I drilled an extra oiling hole just to oil the mating surfaces between the two, and it helped a lot, but didn't cure the issue. (this was pre-internet) I finally figured out the issue, and started using the correct plate with the correct cam/timing gear.
So, tech tip... Do NOT use the billet steel timing sets with an stock iron cam retaining plate.
They also make timing gears and plates with built in Torrington bearings to eliminate the issue... but you're usually okay by choosing materials that play well together.
For the right parts, FlowTech Induction
is an excellent source for this, as well as other 'particulars' that often end up biting you on the a$$. He sells timing sets with the GOOD IWIS chains! These are the best chains out there, and are the only ones to choose for a GOOD engine. Below is a link to timing chain sets, retaining plates, etc.
Valvetrain A to Z - Valvetrain Components - Timing Chain Sets - Page 1 - FlowTech Induction
From there, this timing set... along with the cam plate referenced in the description.