im cleaning out my 170" that sat for a while and i just i pulled the frost plug out of the front of the motor that opens up the oil passage i also took the 1/4" pipe plug out of the back and im wondering if there is any reason why ford put a frost plug instead of a pipe plug up front and if any one has put a pipe plug in there im kind of thinking of puting a pipe plug in as long as it is resesed it shouldent be a problem right?
frost plug
- Thread starter 198?f150
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A frost plug and a pipe plug serve two different purposes. A frost plug is for coolant passages only so that if the coolant would freeze in the engine it will push out the frost plug when the coolant expands thus keeping the block from cracking. If it is threaded in it cannot push out the plug if necessary.
I have threaded the front oil gallery for a 1/4" pipe plug. Just make sure to use a thin one and don't block off the passage going to the first main. It also needs to clear the cam sprocket. I do it because sometimes I'll drill out the main oil gallery, probably not worth doing, so then the frost plug won't fit. Also I don't trust reusing the old plug and I'm too cheap to find one or buy one. Drills and taps, I have.
thanks i did tap it for 1/4"npt
i measured the distance between the front face and the #1 main oil passage and shortened the socket head pipe plug from the back of the motor so it would fit and taped accordingly looks real good there looks like there is plenty of room in the back for a regular hex head pulg (as i cant find another socket headed 1/4" plug at the local hardware store)
just wondering what you drilled your oil gallrey out to. the little 170" dosent need anything fancy but ive now got 3 200" motors to play with
i measured the distance between the front face and the #1 main oil passage and shortened the socket head pipe plug from the back of the motor so it would fit and taped accordingly looks real good there looks like there is plenty of room in the back for a regular hex head pulg (as i cant find another socket headed 1/4" plug at the local hardware store)
just wondering what you drilled your oil gallrey out to. the little 170" dosent need anything fancy but ive now got 3 200" motors to play with
Truthfully, I can't recommend drilling out the main oil gallery because it will make the lifter bores leak more oil.
If you want to do something, it wouldn't hurt to drill out the passages to the oil filter. I hate to spec a certain size because of core shift and casting flaws. Be your own judge. If you are building a serious engine that you feel needs better oiling, I would recommend using an oil filter adapter of some sort. I used a Bronco 90 deg adapter because I had to clear my modified rack and pinion steering shaft. Run a line from the filtering side to where the oil sending unit ties in at the back of the block. That will feed full pressure to the rear main and rods. If you look closely, on page 3 of eye candy you can see how I did it. Not pretty but cheap. The other filter is separate for the turbo.
If you want to do something, it wouldn't hurt to drill out the passages to the oil filter. I hate to spec a certain size because of core shift and casting flaws. Be your own judge. If you are building a serious engine that you feel needs better oiling, I would recommend using an oil filter adapter of some sort. I used a Bronco 90 deg adapter because I had to clear my modified rack and pinion steering shaft. Run a line from the filtering side to where the oil sending unit ties in at the back of the block. That will feed full pressure to the rear main and rods. If you look closely, on page 3 of eye candy you can see how I did it. Not pretty but cheap. The other filter is separate for the turbo.
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