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By Coppers4 - 15 Years Ago
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I have been rebuilding a 292 Y Block. Once the intake manifold is put on there are two round holes left exposed as well as 2 bolt hole. One each side. I have 2 other intake manifolds and they are the same. The spare engine I have had a temp sending unit in it and the other side looked like a factory plug was installed, like a small freeze out. Am I missing something? Is there a crossover pipe. The passenger side would have to be small as not to interfere with the distributor.  
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By rgrove - 15 Years Ago
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If im looking at it correctly, that is for a freeze plug or temp sender, depending on side. The drivers side has an insert that goes in the hole for the temp sender, and just a short bolt goes int he bolt hole. I beleive the pass side has a freeze plug and bolt as well.
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By Duck - 15 Years Ago
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Freeze plug goes in one, and a threaded (ID) bung for a sending unit goes into the other. The freeze plug is a bastard size and a PIA to find in the fractional dimension (can't recall size, at the moment, 11/64 (?) but much easier if you convert the size to millimeters- don't ask how I know this. Just run a SHORT bolt in the bolt holes- they're open to the inside of the motor, and the bolts keep icky stuff out... /Duck
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By John Mummert - 15 Years Ago
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The hole in the head is .910" so you use a 29/32" freeze plug. What is that in 1/1000's of a yard stick?
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By Duck - 15 Years Ago
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John Mummert (7/5/2010)
The hole in the head is .910" so you use a 29/32" freeze plug.
What is that in 1/1000's of a yard stick? 22.6219mm ..../Duck
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By aussiebill - 15 Years Ago
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Duck (7/5/2010)
John Mummert (7/5/2010)
The hole in the head is .910" so you use a 29/32" freeze plug.
What is that in 1/1000's of a yard stick? 22.6219mm ..../Duck Duck and others, i have been using 23 mm freeze plugs here for years, no problems.
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By charliemccraney - 15 Years Ago
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Make sure you don't have the heads on the wrong side.
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By Bob's 55 - 15 Years Ago
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Didn't see it mentioned but if you use too long of bolts in the threaded holes you will bend a couple of push rods. Like Duck mentioned, use SHORT bolts.
By the way, Welcome to the Site...
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By Hoosier Hurricane - 15 Years Ago
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I think Charlie has nailed it. The heads have been switched side for side, therefore the water passages in the front will have one severely restricted and one blocked entirely. Better pull the intake and verify it before going any farther.
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By 314 - 15 Years Ago
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i bought a set of used heads and when i got them home i saw they were not a match.somewhere along the line they changed one head and put on one from the opposite side.they put the freeze plug in the back as you couldnt miss it but left the one in the front in place.the intake covered it over and they ran it like that.must have been the hottest rig in town.
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By Talkwrench - 15 Years Ago
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After trying to clean up my heads as much as possible after what I thought was a disaster [much thanks to Rick for coming and helping me save the ol' girl] I discovered that "hole" on the passenger side head.. .. big hole.. so whats a freeze plug??
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By aussiebill - 15 Years Ago
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Talkwrench (7/7/2010)
After trying to clean up my heads as much as possible after what I thought was a disaster [much thanks to Rick for coming and helping me save the ol' girl] I discovered that "hole" on the passenger side head.. .. big hole.. so whats a freeze plug??We call them "welch plugs", i assume you are referring to rear one on RH cyl head behind intake? you can use 23 mm brass plug from most parts shops.
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By GREENBIRD56 - 15 Years Ago
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"Freeze Plugs" fill the openings in the cast iron engine block and heads where the foundry originally removed the core sand from the casting's water galleries. By boring the holes smooth and fitting them with stamped tin plugs the block is sealed back up to be "water tight" (sometimes). The tin plugs usually rust away in later years and make a mess - the best policy when rebuilding is to use brass plugs (of the right size) when you can find them. Besides the freeze plug at the rear of the right head, nearby there is a tapped hole into the head water jacket that must be sealed up. I have filled them with a short socket head set screw and hard setting sealent to leave the surface near flush.
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By Talkwrench - 15 Years Ago
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Ahh mee no speka engrish... Welsh plug.. hahaha yes R/H/S rear filled with crud 
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By mctim64 - 15 Years Ago
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Sometimes called "Expansion plugs" although in an expanding situation the block is usually what pops out.
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By Talkwrench - 15 Years Ago
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The plug itself seems fine however the bolt hole goes right though to the pushrod passage ..mmm ..
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By mctim64 - 15 Years Ago
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Talkwrench (7/8/2010)
The plug itself seems fine however the bolt hole goes right though to the pushrod passage ..mmm ..That's why the short bolt.
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