Allstar Performance 31100 : Water Pump, Mechanical, 0.625" Pilot, Aluminum, Short Design, Small Block Chevy
ALL-31100
Popular “short style” water pump that was originally used on pre-1969 small block Chevrolets. Pumps are built using all new components and an aluminum body for added weight savings over original cast iron pumps. Pump features a 3/4" main shaft and bearings with a 5/8" pilot and a billet steel hub drilled for both small and large fan bolt patterns making this a good choice for street and mild performance vehicles. Block mount to fan hub dimension is 5-5/8". This pump is recommended for use with mechanical fans over 5,000 RPM. Above this RPM, use the ALL-31105 pump with a 3/4" shaft/bearing. NOTE : Water pumps may need to be clearanced for use with 8" dampers.
- Free domestic shipping over $99
Racing Helmets
| helmet | size | measurement | metric |
| XS | 6-5/8 to 6-3/4 | 20-7/8 to 21-1/4 | 53 to 54 |
| S | 6-7/8 to 7 | 21-5/8 to 22 | 55 to 56 |
| M | 7-1/8 to 7-1/4 | 22-3/8 to 22-3/4 | 57 to 58 |
| L | 7-3/8 to 7-1/2 | 23-1/8 to 23-1/2 | 59 to 60 |
| XL | 7-5/8 to 7-3/4 | 23-7/8 to 24-1/4 | 61 to 62 |
| 2XL | 7-7/8 to 8 | 24-3/4 to 25-1/8 | 63 to 64 |
CMR Helmets
| helmet | size | measurement | metric |
| XS | 6-1/2 to 6-5/8 | 20-1/2 to 20-7/8 | 52 to 53 |
| S | 6-3/4 to 6-7/8 | 21-1/4 to 21-5/8 | 54 to 55 |
| M | 6-7/8 to 7 | 21-5/8 to 22 | 55 to 56 |
| L | 7-1/8 to 7-1/4 | 22-3/8 to 23-3/4 | 57 to 58 |
Rookie Helmets
| helmet | size | measurement | metric |
| One size | 6-3/4 to 7 | 21-1/4 to 22 | 54 to 56 |
