Has anyone ever used this brand before? They make them for our engine, made in the USA. They have four types, standard, race (these are variable bleed down, designed to bleed down at lower rpms if running a big cam), slow (slow bleed down, said to act like a flat design), and "e" type that helps prevent debris from blocking. Can also order special metal, and a host of other options. Their standard set is $420 which seems to process out to a normal set for our trucks.
Part number is A-2104.
http://www.hylift-johnson.com/products/product-catalog/
Part number is A-2104.
http://www.hylift-johnson.com/products/product-catalog/