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1967 Mercury Comet - '67 Comet Stock Replica Engine Rebuild

We rebuilt the engine and added the little stuff to finish our 1967 Comet
By Steve Magnante
Photography by Steve Magnante
1967 Mercury Comet Front View
1967 Mercury Comet Engine Hoist
Back in the early '80s Lincoln... 
   
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1967 Mercury Comet Engine Hoist
Back in the early '80s Lincoln Mercury ran radio, television, and print ads exclaiming, "The cat's full of surprises." When it came to the Comet's 390, we were in for some big ones. Here, Gold Coast's crew preps the engine for a trip to JMS Racing in El Monte, California.
1967 Mercury Comet Drivers Side Exhaust Manifold
The driver-side exhaust manifold... 
   
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1967 Mercury Comet Drivers Side Exhaust Manifold
The driver-side exhaust manifold is a nice 390 GT item, much more efficient than the log-style castings used on garden-variety 390 mills. These eight-bolt castings are virtually identical to 428 Cobra Jet parts.
1967 Mercury Comet Passengers Side Exhaust Manifold
Likewise, the passenger-side... 
   
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1967 Mercury Comet Passengers Side Exhaust Manifold
Likewise, the passenger-side manifold is also a high-flow 390 GT/428 CJ casting--nice. Note that the heads are of the common 14-bolt variety with four bolts on the outermost ports, three bolts on the inner pair. The upper row of exhaust manifold bolt holes are not used with the GT castings, but there's plenty of clamping force to prevent leaks.
1967 Mercury Comet Gt Head Casting
With their 2.02/1.55 valves,... 
   
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1967 Mercury Comet Gt Head Casting
With their 2.02/1.55 valves, the Comet's 390 GT head castings (74cc chambers) share valve and port dimensions with early 427 high-performance heads. Sure, later 427 Medium- and High-Riser heads are better for all-out performance, but for our mild street/strip cruiser, these castings are just fine.
1967 Mercury Comet Intake Manifold
Continuing the theme of reusing... 
   
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1967 Mercury Comet Intake Manifold
Continuing the theme of reusing most of the parts we had, we retained the Edelbrock Streetmaster cast-aluminum intake manifold and Edelbrock 1406 600-cfm carburetor. The pen points to the internal plenum dams that maintain flow velocity for maximum fuel atomization and low-end torque output.
1967 Mercury Comet Protruding Lock
OK, now here come the nasty... 
   
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1967 Mercury Comet Protruding Lock
OK, now here come the nasty surprises! This is what we found lurking at the No. 3 intake valve. The protruding lock was only semi-installed before the builder moved on to the next valvespring installation. This thing was getting ready to drop a valve. And to think Glad and McGann drove this car all the way from New Mexico to L.A. without any trouble.

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