dont forget guys . L31 vortec if using 95 older water pump NEEDS a bypass hose to the intake like a big block chevy did for years or the trapped air will girgle in the system and make wierd noises and temp go up/down . i had the problem and gm tech help line guy got me figured out quickly .
here is a few pics of the cure .
45" nipple from ebay as local store's didnt have . molded bypass hose for a ford application . std nipple to top of water pump port .
whole thread here tho .
http://67-72chevytrucks.com/vboard/s...d.php?t=778518