Comp Cams 981-16 Set Of 16 Single Springs W/ 1.254 O.D., 1.254 I.D., 1.700 Installed Height Shaft Kits Many applications don’t require drilling

Many applications don’t require drilling or cutting in case you want to DIY

Professional installation is highly recommended Need purchase a 6-point hub adapter separately in order to install this item

It fits Duo Therm Penguin models '1' and '2'

this exhaust pipe is a must-have for anyone looking to enhance their vehicle's performance

Comp Cams 981-16 Set Of 16 Single Springs W/ 1.254 O.D., 1.254 I.D., 1.700 Installed Height Shaft Kits Many applications don’t require drillingWith a 1. 254 outer diameter and a recommended installed height of 1. 700, these springs are ideal for use in Chevrolet Small Blocks with factory, unmodified cylinder heads. These springs have a 105 pound seat pressure, max lift of 0. 490 and a spring rate of 373 pounds, making them ideal for mild flat tappet camshafts. 981 springs are compatible with our 750 16 retainers and 4753 shims.