* Mild street: Pans and Shovels, smooth idle, more power through RPM range. Bolts in with no head work. OK for stock heads.
* If you are installing cams in a Genny Shovel or Pan engine, the Andrews valve spring collars and related parts will make things go a lot smoother. The Andrews springs and collars are designed for easy installation and maximum reliability.
– Upper Spring Collars AP-271100 (high lift) or AP-276150 (Medium lift) , Lower Spring Collar AP-273120 and High Lift Sprin