A couple of weeks ago, my 1968 Corvair dropped both valve seats on the #5 cylinder. Luckily, the piston seems to be intact, but I may take it off to make sure the piston and rings are in good condition before attempting to run it again. The engine is kind of a frankenstein, but the "core" of the engine seems to be a 1963 84 hp engine. The driver side head (the intact one) is an 84 hp head. The passenger side head (the damaged one) is an 80 hp head, so I suspect that this engine had some problems in its previous life.
I managed to find a 1963 102 hp head locally. The head has sat in a shed for a long while, but it visually looks fine. Will I have any problems bolting a 102 hp head to an 84 hp engine? According to the CORSA Corvair tech guide, the 84 hp head and the 102 head seem to have the same compression. Will this mean that the head should be compatible, or are there other differences between the 84hp and 102 head that could cause issues? Surely it can't run worse than having two heads with different compressions on the same engine?
Damaged Head: #3813513
Intact Head: #3813512
"New" Head: #3813516
Currently working full time repairing Corvairs and restoring old cars.
Located in Snellville, Georgia
I do actually plan to build up a 140 hp engine for the car and ditch the 84 hp engine, since that's what it came from the factory with, but I did not realize how unique the 140/auto engines are from 140/manual engines until I started gathering parts. Because of that, its taken longer than I expected for the engine to come into fruition. The 140 I'm building for it probably won't be ready for another 6 months, so I'm trying to make the current engine last until then.
- Corvair of the Month
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See page 6 of the attached CORSA Corvair Technical Guide 1+2 - Corvair Code Numbers for cylinder head details.
- CORSA Corvair Technical Guide 1+2 - Corvair Code Numbers.PDF
- CORSA Corvair Technical Guide 1+2 - Corvair Code Numbers
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Lake Chatuge, North Carolina
1966 Corvair Corsa Convertible