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What is the bolt size for valley cover on 2015 gmc sierra 1500 4.3 liter


Patrick1988

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What bolt size for the valley cover , where fuel injectors are. On a 2015 gmc sierra 1500 4.3 liter. I had a leak and when tightened bolt broke. I can't find anything online about what size this bolt is. I knkw it's a 13mm and around 1 3/4 to 2 inch bolt. 

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Probably has a 13mm head, but I guarantee you it's NOT anywhere near a 13mm BOLT. That is HUGE - half inch wide! No chance in hell GM would spend that kind of money on hardware for a valley cover.

 

Bring another undamaged bolt with you to a hardware store - they usually have the display there with the hole for the shank size, and threads to figure out the pitch. Home Depot and Lowe's have that as well. If I were to guess, it's probably an 8mm or 6mm bolt. Use a wrench to measure the threaded portion. If a 8mm wrench fits it perfectly, it's an 8mm.

 

Knowing GM, it's some oddball size / length that you won't be able to match up at a hardware store as far as one to buy. But you might get lucky. Probably $5 each through GM, lol. Or $10 ...

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