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kit_16:
My '81 sx/4, originally began life as some others with a small iron duke. Now its in the process of getting a new power plant, but still a pontiac one none the less.  I am placing the Pontiac OHC-6 sprint into it. never seen or heard of this being accomplished. but with both sitting in the garage and duke was on its last leg, so the thought occurred to me, high torque and high rpm and all wheel drive seem like a nice match.  I will post pictures and more info as I go along.  Would appreciate any input on this matter and would like to hear about other custom engine conversions and upgrades other people have placed into their eagles.  especially the all wheel drive ones.  this car seems like it would make an awesome rally car.

txjeeptx:
Neat idea, but it will make parts more difficult to find, and you'll have to fabricate axle mounts/engine mounts.

If it shares the SBC bellhousing bolt pattern, then wouldn't a 4.3L V6 swap be easier? Vortec would be nice. But it would lack the cool factor of the vintage engine.

83Eagle!:
I am not familiar with that Pontiac engine.

amcinstaller:
even though it is a pontiac engine, i find its a refreshing change from the warmed over "just throw a chev engine in it" idea. you should definately fill some of us less informed in on a little history on that engine

kit_16:
The OHC-6 design was adopted by Pontiac in the 1966 model year. The block was based on the Chevrolet Straight-6, but had block and head castings unique to the OHC. Both head and block were cast iron; only the large cam carrier/valve cover was aluminum. The engine featured a Single OverHead Cam and was the base engine in the Pontiac Tempest.

The Pontiac OHC-6 engine shared internal dimensions with the standard 230-cubic-inch (3.8 L) Chevrolet I6 block. The OHC head design put it in the avante garde of Detroit engineering. The single camshaft was supported by journals within the aluminum valve cover: no separate bearing shells were used. The cam was driven by a glassfiber-reinforced cogged rubber belt, instead of the usual metal chain, making it state of the art for the time - and very quiet. Valves were opened with finger followers (centered under the cam) that pivoted at one end on stationary hydraulic adjusters. The oil pump, distributor drive and fuel pump drive were not within the block, but were handled by an external jackshaft in an aluminum housing that bolted to the right side of the block. The jackshaft was driven by the rubber timing belt. The head had a single port face (exhaust and intake were both on the left side) and the valve stems were strongly tilted towards the left. This engine was used on the 1966 through 1969 Tempest and Le Mans and the 1967 through 1969 Firebird.

A high-performance version, called the Sprint, was an option. The Sprint featured high-compression pistons, a hotter cam, dual valve springs, a split/dual exhaust manifold, a better coil and utilized the then new Quadrajet 4-barrel carburetor. It was the first American high performance six cylinder engine since the demise of the Hudson Hornet.

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