[Captainfab]

The L30 and L31 Vortec small blocks were not TBI. They were CPI/CSFI.

Originally Posted by Ironangel

Sorry for the late response, don't get bummed out because an L46 is the Corvette RPO number for the same L31 350 ci Vortec V8... https://www.google.com/search?q=gm+l...+specs&ie=&oe= Somebody else on the board here just installed that same motor and was pretty happy with it, might be able to find it in the search box above? The Vortec is considered a gen 1 design but has unique differences, they are/were throttle body fuel injected motors from the factory, "TBI" instead of carburetor's. They have/use tank mounted fuel pumps that require fuel pressure regulators for carburetor use. A carbed Vortec will require an intake manifold designed for a carb, a spreadbore design in your case since your using the greatest carb ever made, a Quadrajet. Do your research, when you get that thing running your going to smile and realize you bought the right motor... A 1/4-20 bolt gets 10 ft lbs, double that for 5/16-18 bolts, 20 ft. lbs. Double that for 3/8-16 bolts, 40 ft. lbs. 7/16-14 bolts get 60 ft. lbs and 1/2-13 gets 90 ft lbs. Those are grade-5 specs. Unless your using a specified nut you don't need grade-8 bolts. A grade-8 bolt used in a shallow threaded cast iron hole such as a motor mount hole can lead to BIG trouble!