IGF-1 (Insulin-Like Growth Factor 1). IGF-1 or insulin-like growth factor 1 (brand name: Increlex) is a growth factor which is very closely related to insulin. It carries the same amount of amino acids as insulin and responsible for the anabolic reactions to GH.
Spring pressure is the key factor in determining which spring should be used for which application. Camshaft design also plays an important role in determining which spring you will need. Lift is the critical spec when matching valve springs to the camshaft. The more lift you have the greater the pressure needs to be.
Generally speaking when you increase the spring pressure you will also increase the diameter of the valve spring itself. The cylinder head youâre putting these springs into may not be machined for this diameter so you will need to machine the spring seat to accommodate the larger spring.