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C4 Corvette Performance Rebuild - Why Ask Y?

Join the Vette set.
By Steve Magnante
Photography by Steve Magnante
1985 Chevrolet Corvette C4 Engine At The Track
The best e.t.'s result when... 
   
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1985 Chevrolet Corvette C4 Engine At The Track
The best e.t.'s result when the 700-R4 shifts for itself. In total, there were 358,180 C4 Corvette coupes and convertibles built between 1984 and 1996, so finding one near you won't be a problem. Convertibles weigh more and usually need costly top repairs. Hold out for a coupe.
  • 1984 was the peak year for C4 production, with 51,547 built. That's a whole lot of L83 Cross-Fire cars to avoid.
  • The peak year for L98 Corvette production was 1985, with 39,729 built.
  • The least-produced L98 is the '91, with 20,639 coupes and convertibles built.
  • LT1 production peaked in 1994, with 22,882 built. That's 300 horses, baby.
  • The '90 ZR2 Corvette-engineering mule car featured 454 Rat power and EFI. Considered as a possible stopgap between the base L98 mill and the super-expensive LT5, it never reached production, despite being shown to the press.

1985 Chevrolet Corvette C4 Engine Engine Bay
Unless you're Y-car savvy,... 
   
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1985 Chevrolet Corvette C4 Engine Engine Bay
Unless you're Y-car savvy, be sure to take plenty of photos of the engine, hoses, cables, sensors, brackets, and accessories to guide reassembly. At least the C4's raised-clamshell hood allows excellent access. Dig the forged-aluminum suspension control arms and magnesium valve covers.
1985 Chevrolet Corvette C4 Engine Cylinder Heads Removed
The Corvette's engine setback... 
   
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1985 Chevrolet Corvette C4 Engine Cylinder Heads Removed
The Corvette's engine setback helps handling but makes it impossible to get wrenches between the heads and firewall for transmission separation. Short of cutting access holes in the firewall, the only solution is to strip the heads and intake in the car.
1985 Chevrolet Corvette C4 Engine Parts
Here's the stuff that has... 
   
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1985 Chevrolet Corvette C4 Engine Parts
Here's the stuff that has to come off before the block can be hoisted up and out. Aluminum cylinder heads arrived in 1986 on all the 7,315 convertibles, but only the last 8,594 of the 27,794 '86 coupes built got the alloy goodies. From '87 on, all Corvettes had aluminum heads. This '85 makes due with stock iron castings.
1985 Chevrolet Corvette C4 Engine Block
When I'm not crawling around... 
   
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1985 Chevrolet Corvette C4 Engine Block
When I'm not crawling around on TV, I'm at home having the time of my life with projects like this.
1985 Chevrolet Corvette C4 Engine Crank
The source of the knock turned... 
   
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1985 Chevrolet Corvette C4 Engine Crank
The source of the knock turned out to be a spun No. 3 rod bearing that still bore its 8-84 birth date. The wounded crank cleaned up after a 0.030 cut. In keeping with the budget theme, the stock forged pistons, cam, and lifters were reused. The total price of the machine work and parts was $657.89, which included one rod, fresh rings, bearings, and a gasket kit.
1985 Chevrolet Corvette C4 Engine Oil Pan
Thanks to a monthlong winter... 
   
  read full caption
1985 Chevrolet Corvette C4 Engine Oil Pan
Thanks to a monthlong winter rainstorm and no dry place to do the assembly, my trusty Pinto hatchback became a mobile clean room. Notice the aluminum tubing for the Corvette's oil-cooler plumbing and extra-capacity Y-car oil pan.

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Dodge Charger When looking for your next vehicle, think about the Dodge Charger, a stylish car with nice features. With available rebates and prices, you can find a new Charger for $25,080.00. It comes with a standard Automatic transmission, and RWD drivetrain. You also might want to research the Pontiac Grand Prix and the Chrysler Crossfire.
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