Does anyone know where i can get the freeze out plugs and oil galley plugs for an LT-1? We ordered a federal mogul 381-8059 kit but the galley plugs aren't right. They are too small for the hole in the block,and they don't have the squirt holes in them. Does anyone know what size those holes in the block are? Can someone help me out with part numbers or advise? Thanks

 

Your local NAPA store or GM dealer.
The holes in the timing cover plugs are .036 and you may have to drill them.

 

Are those holes in the timing cover plugs really needed? I read in the "Rebuilding an your LT1/LT4" book that they aren't really needed and don't do all that much. I'd just like to be sure they know what they speak of.

 

They are to lube the chain and WP gears. I would say they are a good thing that SBC never had and every time ya pulled one down it needed a chain or timing set.