Speed Inc.
Illinois-based Speed Inc. is well known for its head and cam packages, and also retails a broad selection of performance parts for late-model GMs. This particular engine has garnered 8-second timeslips in the company's Z28 race car, but Speed Inc. can build any LS-style Gen III or IV engine for naturally aspirated or forced-induction applications.
| SPORTSMAN 370 BOOST LONG-BLOCK |
| COMPANY NAME: | Speed Inc. |
| BLOCK: | 6.0L, iron |
| DISPLACEMENT: | 370ci (6.1L) |
| COMPRESSION | 8.6:1 |
| CRANKSHAFT: | 3.622-inch, GM |
| PISTONS: | 6.125-inch, Eagle, 3D |
| RINGS: | 4.030-inch, diamond, forged |
| ROD BEARINGS: | not specified |
| MAIN BEARINGS: | not specified |
| CAM BEARINGS: | not specified |
| BOLTS: | ARP |
| HEADS: | AFR aluminum, 225cc |
| HEAD GASKETS: | MLS |
| CAM: | Speed Inc. hydraulic roller, custom boost grind |
| LIFTERS: | COMP Cams |
| PUSHRODS: | COMP Cams chrome-moly |
| ROCKER ARMS: | no |
| VALVESPRINGS: | not specified |
| INTAKE MANIFOLD: | no |
| THROTTLE BODY: | no |
| FUEL INJECTORS: | no |
| MAF: | no |
| WIRING HARNESS: | no |
| PCM: | no |
| CORE CHARGES: | $275.00 on crankshaft |
| WARRANTY: | no |
| PRICE: | $6,999.99 |
| COMMENTS: | Includes double-roller timing chain and high-volume oil pump. |