Mark IV Big Block Chevy Engine - The Mark of Chevy Power
Where Chevy Muscle Really Lives
By Paul Zazarine, Photography by Courtesy of GM
1965-1974 Chevrolet Mark IV Engine Specifications
| RPO | Displacement | Horsepower | Torque | Application |
| 1965 |
| L35 | 396 | 325@4,800 | 410@3,200 | Chevrolet |
| L78 | 396 | 425@6,400 | 415@4,000 | Chevrolet |
| L78 | 396 | 425@6,400 | 415@4,000 | Corvette |
| L37 | 396 | 375@5,600 | 415@3,600 | RPO Z16 Chevelle |
| only |
| 1966 |
| L35 | 396 | 325@4,800 | 410@4,800 | Chevrolet/Chevelle |
| L34 | 396 | 360@5,200 | 415@3,400 | Chevelle |
| L78 | 396 | 375@5,600 | 415@3,600 | Chevelle |
| L36 | 427 | 390@5,200 | 470@3,600 | Chevrolet/Corvette |
| L72 | 427 | 425@5,600 | 460@3,600 | Chevrolet/Corvette |
| 1967 |
| L35 | 396 | 325@4,800 | 410@3,200 | Chevrolet/Chevelle |
| L34 | 396 | 350@5,200 | 415@3,400 | Chevelle/Camaro |
| L78 | 396 | 375@5,600 | 415@3,600 | Chevelle/Camaro |
| L36 | 427 | 390@5,200 | 460@3,600 | Chevrolet/Corvette |
| L68 | 427 3x2 | 400@5,400 | 460@3,600 | Corvette |
| L72 | 427 | 425@5,600 | 460@4,000 | Chevrolet |
| L71 | 427 3x2 | 435@5,800 | 460@4,000 | Corvette |
| L88 | 427 | 430@4,600 | 485@4,000 | Corvette |
| L89 | 427* | 435@5,800 | 460@4,000 | Corvette |
| * Aluminum Head |
| 1968 |
| L35 | 396 | 325@4,800 | 410@3,200 | Camaro/
Chevrolet/Chevelle |
| L34 | 396 | 350@5,200 | 415@3,400 | Nova/Camaro/
Chevelle |
| L78 | 396 | 375@5,600 | 415@3,600 | Camaro/Chevelle |
| L89 | 396 * | 375@5,600 | 415@3,600 | Camaro/Nova |
| L72 | 427 | 425@6,400 | 460@4,000 | Chevrolet |
| L36 | 427 | 390@5,400 | 460@3,600 | Corvette |
| L68 | 427 | 400@5,400 | 460@3,600 | Corvette |
| L71 | 427 3x2 | 435@5,800 | 460@4,000 | Corvette |
| L88 | 427 | 430@4,600 | 485@4,000 | Corvette |
| L89 | 427* | 435@5,800 | 460@4,000 | Corvette |
| * Aluminum Head |
| 1969 |
| L35 | 396 | 325@4,000 | 410@3,200 | Camaro/Chevelle |
| L34 | 396 | 350@5,200 | 415@3,400 | Chevelle/Camaro/Nova |
| L78 | 396 | 375@5,600 | 415@3,600 | Chevelle/Camaro/Nova |
| L89 | 396+ | 375@5,600 | 415@3,600 | Chevelle/Camaro |
| L36 | 427 | 390@5,400 | 460@3,600 | Chevrolet/Corvette |
| L72 | 427 | 425@5,600 | 460@4,000 | Chevrolet/Corvette |
| LS1 | 427 | 400@5,400 | 460@3,600 | Chevrolet |
| L72 | 427 | 425@5,600 | 460@4,000 | Chevelle * |
| L68 | 427 | 400@5,400 | 460@3,600 | Corvette |
| L71 | 427 3x2 | 435@5,800 | 460@4,000 | Corvette |
| L88 | 427 | 430@5,200 | 450@4,400 | Corvette |
| L89 | 427+ | 435@5,800 | 460@4,000 | Corvette |
| RPO | Displacement | Horsepower | Torque | Application |
| ZL1 | 427@ | 425@5,600 | 460@4,000 | Camaro # |
| ZL1 | 427@ | 430@5,200 | 450@4,400 | Corvette |
| * COPO 9562,9566,9694 |
| 430@5,200 |
| 450@4,400 |
| # COPO 9561 427 ZL1 |
| # COPO 9560 427 ZL1 |
+ Aluminum Head
@ All Aluminum |
| 1970 |
| L34 | 396/402 | 350@5,200 | 415@3,400 | Camaro/Chevelle/
Nova |
| L78 | 396/402 | 375@5,600 | 415@3,600 | Camaro/Chevelle/ Nova |
| LS3 | 400 | 330@4,800 | 410@3,200 | Chevelle |
| LS5 | 454 | 390@4,800 | 500@3,400 | Corvette |
| LS6 | 454 | 450@5,600 | 500@3,600 | Camaro |
| L89 | 402* | 375@5,600 | 415@3,600 | Chevelle |
| LS5 | 454 | 360@5,400 | 500@3,200 | Chevelle |
| LS6 | 454 | 450@5,600 | 500@3,200 | Chevelle |
| LS7 | 454 | 460@5,600 | 490@3,600 | Corvette |
| * Aluminum Head |
| 1971 |
| LS3 | 402 | 300@4,800 | 400@3200 | Chevrolet/Chevelle/
Monte Carlo/Camaro |
| LS5 | 454 | 365@4,800 | 465@3,200 | Chevrolet/Chevelle/
Monte Carlo/Corvette |
| LS6 | 454 | 425@5,600 | 475@4,000 | Chevelle/Monte
Carlo/Corvette |
| 1972* |
| LS3 | 402 | 240@4,400 | 345@3,200 | Monte Carlo/
Chevelle/Camaro |
| LS5 | 454 | 270@4,000 | 390@3,200 | Chevelle/Chevrolet/
Monte Carlo/Corvette |
| * SAE Net |
| 1973* |
| LS4 | 454 | 275@4,400 | 395@2,800 | Chevelle/Monte
Carlo/Corvette |
| * SAE Net |
| 1974* |
| LS4 | 454 | 235@4,000 | 360@2,800 | Chevrolet/Monte
Carlo/Chevelle |
| LS4 | 454 | 270@4,400 | 380@2,800 | Corvette |
| * SAE Net |
By Paul Zazarine
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