Hello all, I have a quick question regarding a C4 rebuild. I have a '75 Maverick that had a 250 I6 until I blew a rod through the oil pan. I found a donor 302 from a 1992 pickup, and I am going to install the engine when I get back home from college. From what I understand, the 250 tranny will work just fine with the 302, as they used the same size bellhousing. Do any of you have suggestions regarding what kit I should get? I am not looking for a performance kit, but I still want the tranny to last as long as possible. Thanks in advance.
Looked into the Transgo kits. It appears that they currently only offer valve body reprogramming kits, instead of the master kits like those from B&M or Alto. Any success with those kits? They are about $250 - $350 each, so I want to make sure that others have not had major problems with them.
They work fine. Don't be in a hurry and work on a clean surface, so you don't lose any parts. when re-installing, torque all bolts to specifications.
I used to rebuild C4 with a $30 kit from Sears. Didn't include the reverse servo or modulator, but for less than $50 total, I was back on road.
Your going to need a flywheel if you stick with the 157 tooth flywheel originally used on the 302 maverick. That 1992 engine will be a different balance than the 1982 and older engines.
plus if you use the 250 6 cylinder bell housing you will definitely the 50 ounce flywheel. 164 tooth wont work with the 250 ci. bell,its designed for the 157 tooth.
I planned to use the old flywheel from the 250. I believe the 250s used the 157, unless I am mistaken. (I haven't actually counted the teeth yet.)
Flexplate for 250 are zero balanced, didn't require weight. 157T were all 28oz, the 50oz are aftermarket only.
Makes sense now that I think about it. 250 wouldn't need any balancing because it is an inline arrangement. 5.0, being a V8, now has unbalanced rotation with the offset pistons, and therefore needs an eccentric mass (50 oz) to correct the unbalanced rotation. (Much like getting wheels balanced.)
Sorry that ain't how it works, pistons and rods are balanced by counter weights on crankshaft. Inline or V makes no difference. Early small blocks required 28 oz to balance, around 1980 Ford CHEAPENED cranks by removing amount of cast iron, went to 50oz imbalance. Run really hard(racing), the 50oz cranks often break at #1 counterweight just behind the #1 & #5 rod journals.
