Thread: Boss fitting for1/8 npt on back side of 302 engine

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That sounds like the port for the Thermactor System. The air pump used to connect to those ports via a metal tube that crossed between the 2 heads and then a hose to the air pump. The EPA says no you can't block'em off - yeah, right.....

They make a lot of noise without anything to quiet down the sound, don't they?!?!

Thinking he was speaking of the block. If its the thermactor holes a short as possible 5/8 coarse thread bolt will block them off

This is on the back of the block right under the passenger side head and it is 1/8 pipe because I started a 1/8 fitting in it that comes in a oil pressure gauge kit. I think it would be safe to just block it off. I hope!!!

Originally Posted by turbo2256b

Thinking he was speaking of the block. If its the thermactor holes a short as possible 5/8 coarse thread bolt will block them off

That's true if the threaded insert isn't installed. But he writes it's in the block and I cannot remember anything back there being threaded 1/8" ! So IDK!

I think there is a threaded hole facing outward dont thik its pipe thread. Dont remember ever seeing it used. Might be for the trany dipstick tube in a van possibly.