Quote:
Originally Posted by alankenji_84
HEy thanks, I was just wondering, How do I know which valves (intake/exhaust) are shot or if its pistons/rings etc. will a leak down before i take the heads off tell me more specifically.
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Yes. You really should search the forum, there's been a lot of talk lately about leakdown tests
This will get you started:
http://www.geocities.com/dsmgrrrl/FAQs/leakdown.htm
But understand that you already know you have 2 bad cylinders, so the heads are coming off. If you're trying to line up parts so you can have "everything you need" when you pull the heads, just over-buy. Pick up two sets of intake and exhaust valves along with a gasket set. But figure on forgetting something... you _will_ have to do a parts run or two while the truck is torn down in the driveway.
Also, like I said above, it may NOT be a valve... it could be rings, piston, etc...
Short of doing the work IN a parts depot, there's really no way that you're gonna get around tearing down the block and being without the truck for a while.