The qickest way to a double roller timing chain set to fit a 250 block might be in using and modding the SBF V8 gears (289, 302, 5.0) with a modded or custom lenght chain. At least some on this site have went this route like Does 10's the first to custom engineer a working set and later also Mike1157 see the below links. Good luck
Dose 10's Double Roller Timing Chain Set
http://fordsix.com/forum/viewtopic.php? ... 4&p=447439
Mike1157 Double Roller Timing Chain Set,
/viewtopic.php?f=5&t=71635
http://fordsix.com/forum/viewtopic.php?f=101&t=71986
Differences in the two stock Ford 250 Timing Chain Sets.
1. The early narrow set 1969 to 1972 has cam timing straight up is suitable for a stock to mild engine build.
2. The 1973 and later the chain is wider and the cam gear is retarded 4 degrees this is also suitable for a stock to mild engine build
See pictures in this old Post by Econoline
I know this has been discussed and I have read through all the various topics posted regarding the timing set for the 250 but I am still a little confused. I want to replace my timing set so I've been looking into it. My 250 is a '70 and I understand I want a pre '73 chain.
There has been a lot of discussion that the available sets are all late era retarded. But when I look for a set I find 2 different sets available from at least 2 companies and probably sealed power as well(with a couple of hitches
). First are the ones available @ Autozone and Advanced Auto and maybe elsewhere, the "SA Gear" #73083 @ $38 for '69-'72 250 & #73016 for '73 on. Next is Cloyes, while no set is available for '69-'72, parts can be bought to make a set those being #C363 chain, #S415 crank, and #S414 cam @ ~$70. The '73 on is available in set #C3016 with the only part difference being the cam sprocket #S442 vs S414 for the early version.
To complicate things further, I present these 3 pictures, notice the "SA" in the casting.
Cloyes S414:
"SA" late:
"SA" early:
On the "SA" late set, if you look close, you can see S442 on the cam sprocket as well as "SA" and so on and S415 on the crank sprocket showing that this "SA" set is in fact Cloyes, the difference may* be in the chain which may* be a Cloyes C354 which is a cheaper chain than the C363. If you look at the "SA" early set it has the S415 sprocket but the Cam sprocket is completely different, and not the S414
Any light any one can shed would be great. At this point I think I'll just peice meal an all Cloyes set together with the C636, S414, and S415
I feel like Mike Myers
welcome to schprokets
And one Last 250 timing chain set info that might be adaptable to work for a 250 block see below link for some more posts by Xstascy.
viewtopic.php?f=1&t=69097&p=547594&hilit=250+timing+chain+set#p529459