422ci Build sheet
Specifications not listed are the same as stock. Except as noted, all dimensions are in inches or fractions thereof. All prices sourced through Larry's Performance and Summit Racing.
| Displacement | 422ci |
| Bore x stroke | 4.165 x 3.875 |
| Compression | 10.7:1 |
| Rod, center-to-center | 6.00 |
| Piston deck height | 0.019 |
| Chamber volume | 70 cc |
| Rod-bearing clearance | 0.0024 |
| Crank endplay | 0.0045 |
| Piston-ring endgap | 0.022 top; |
| | 0.024 second |
| Piston-to-wall clearance | 0.004 |
| Main-bearing cap torque | 75 ft-lb* |
| Rod-bolt torque | 55 ft-lb* |
| Head-bolt torque | 75 ft-lb* |
| *moly-lube |
On the dyno with two 750-cfm...
On the dyno with two 750-cfm Holley double-pumper carburetors, the engine looked very impressive. As with any new engine, we begin by running the engine through a variety of cycles for about 20-30 minutes to break it in and check for any operational issues. This engine ran flawlessly during the break-in period.
We checked the dual-quad carburetor...
We checked the dual-quad carburetor linkage to ensure full operation at WOT. The timing was also set at 37 degrees. We fired up the dyno and recorded a strong 525.8 horses at 5,900 rpm.
After our initial dyno pull...
After our initial dyno pull we decided to rejet the carburetor (from 71/80) up one size on the primaries and down two sizes on the secondaries (to 72/77). We also ran a series of ignition settings from 35 to 45 degrees.