m in sc":1t7asac8 said:no, crank end sizes are different.
what IS the end size?
I would like to have the end turned (on my 250) to mount a double chain/gear from a 200.
* Would the tc cover from the 250 still fit?
* Do U think a specific year set would be more desirable (as in the '69 set is better for the 250)?
xctasy":34gm5d9t said:Ford made the changes because of w...nd you've just gotta find the right parts.
balldrick":20bhu03o said:Well got my bottom end together today. Went pretty well, had a problem with a bottom oil ring it bent and i noticed a rub mark when i turned the motor over. (The one thing ive learnt is dont by cheap tools).Heres a couple pics.200 rods with 4.6l rover stroker pistons.
Diecrest eng. geardrive.
balldrick":20bhu03o said:Gday JackFish, Its from a company here in Aus called Diecrest Enginering it was advertized to fit the 250 crossflow but as you can see it fits the Aus 250 pre-crossflow as well. This one is adjustable thay also make a non-adjustable a bit cheaper. It seems well made and the only mod needed is to file a slot in timeing cover. I dont know if they will fit the American 250?JackFish":20bhu03o said:So tell us about the gear drive...
chad":1e03y1x3 said:ahh, a 302 chain? Remove a few links? What's the other components (& processes)?i Diecrest Eng. &...
Does the oem timing cover still fit ?
The 2nd pic - gear drive (al la 300/4.9) isn't for Sarah (the '70/'77 bronk).
dayman":1e03y1x3 said:What is the best timing chain set to use for a 250?
Do any have a crank gear with multiple keys to allow for advancing or retarding camshaft?
If not, how do you degree the cam?
Thanks
Does10s":1e03y1x3 said:Definately not the same. The center to center of the crank to Cam is the same distance I believe, but the crank snout diameters are different.
I did a SBF double roller timing chain swap on my Wife's Falcon with a 250. There's a tread on here somewhere with the specifics.
It's isn't a bolt in set up for sure. It will take some modifications.
But it seems to work very well!
Later,
Will
Does10s":1e03y1x3 said:Well it looks like this is going to work! Kelly's shortblock is reassembled! It's not running yet, but will be in a few weeks. She races again Labor Day Weekend.
I've been at this for awhile waiting patiently for my machine shop to finish up the required machine work.
Anyway here's what I did to get this to work. This is NOT a bolt in!
1. Turned the cam snout down to match that of a SBF.
2. Drilled dowel pin hole into first bearing race journal just like a SBF.
Clay Smith should be able to do the above two items if you special order a cam from Mike. (I just used our cam)
3. To get the sprocket-to-sprocket alignment correct, we removed .050" from the crank. This allowed the crank sprocket to move further aft.
4. Installed the crank sprocket backwards. Yes backwards. Again for alignment. (makes for real fun degreeing! )
5. Fabricated my own thrust plate. The SBF cam sprocket needs a thrust plate that is .250" thick. I Just copied the 250 one and increased the hole size to clearance the dowel. I have a radius of .118" worth of thrust plate holding the cam in the block. This is probably sufficient, but I'm going to fab up a "cam button" out of SBC version. Just for insurance.
6. Shortened the chain by 1 link.
Note the counter sunk thrust plate bolts. This was to clear the roller bearing billet sprocket. Also note the very long crank woodruff key.
http://memimage.cardomain.com/ride_imag ... medium.jpg
Now we have a double roller, billet cam sprocket, multi-indexed crank sprocket with 9 keyways, and we no longer have that stupid little dowel pin!!!
http://memimage.cardomain.com/ride_imag ... medium.jpg
Bigger pics athttp://www.cardomain.com/ride/686815
I'll let you know how it goes!
Later,
Will
m in sc":1387oov7 said:that for a us spec 250?
Nominal 1-3/8" diameter crank snout for US 250, a nominal (and unique!) 1-1/4" for everything else small I6
(144-170-187-188/3.1 liter-200-221/3.6 liter-Aussie 250, Ohc 3.2, 3.9/4.0). I4 OHV 2.3 and 2.5 liter crank snout is the same.