Ok here is my problem:
I am on an extremely tight budget right now, my goal is only to get this car running again as it is my only car and daily driver, performance will come later. I am doing a 200/C3 to 250/C4 swap in an 81' Mercury Cougar. I have a 76' 250 that I am tearing down to check the integrity of internal components, it was last run 2 years ago and was good then.
After sitting for 2 years the crank, rod, and cam bearing faces are all good... but rust had started to form on the cam lobes. I used a little naval jelly to remove the rust and there is some very slight pitting of the surface.
Now for the questions:
1. Would I be better off using the head from my 81' 200, it's in much better condition and only has about 40k miles on it? Or should I stick with the 76' 250 head, milage unknown... ?
2. Does the 76' head have hardened valve seats?
3. Are the log CC and intake valve sizes the same on these 2 engines at 1.750 and 1345cc? Or does the 76' 250 have smaller intake valves 1.649 and 1240cc log like the 74'?
4. Can I use the cam from the 81' 200 in the 76' 250? Are the specs the same?
There is no information on the general specs chart on the Classic Inlines page about 250's from 1975 and 76'... also no information about post 1980 200's. As far as I know the chamber size for both 200 and 250 has remained the same from 69' up at 62cc. But the intake sizes changed as well as valve sizes throughout the years.
Thanks for any info or thoughts anyone has on this...
I am on an extremely tight budget right now, my goal is only to get this car running again as it is my only car and daily driver, performance will come later. I am doing a 200/C3 to 250/C4 swap in an 81' Mercury Cougar. I have a 76' 250 that I am tearing down to check the integrity of internal components, it was last run 2 years ago and was good then.
After sitting for 2 years the crank, rod, and cam bearing faces are all good... but rust had started to form on the cam lobes. I used a little naval jelly to remove the rust and there is some very slight pitting of the surface.
Now for the questions:
1. Would I be better off using the head from my 81' 200, it's in much better condition and only has about 40k miles on it? Or should I stick with the 76' 250 head, milage unknown... ?
2. Does the 76' head have hardened valve seats?
3. Are the log CC and intake valve sizes the same on these 2 engines at 1.750 and 1345cc? Or does the 76' 250 have smaller intake valves 1.649 and 1240cc log like the 74'?
4. Can I use the cam from the 81' 200 in the 76' 250? Are the specs the same?
There is no information on the general specs chart on the Classic Inlines page about 250's from 1975 and 76'... also no information about post 1980 200's. As far as I know the chamber size for both 200 and 250 has remained the same from 69' up at 62cc. But the intake sizes changed as well as valve sizes throughout the years.
Thanks for any info or thoughts anyone has on this...