Old evo heads on a newer evo
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Stage IV
Joined: Feb 2015
Posts: 4
Likes: 1
From: Colorado
Old evo heads on a newer evo
Hi everyone....so... I recently purchased some evo heads on eBay for $125. Great deal considering they came complete with everything. I have torn them apart and cleaned them and they are in great condition. They're not reassembled yet.
Now after I did all this I put a light down the heads top end breather bolt hole and saw a solid end on the inside of it. Thinking I was just not seeing where the breather hole traveled into the head I put my mouth on it and blew and sure enough...no where for the air to go.
So I think I have arrived at a understanding and maybe I am right maybe I am wrong...please educate me. What I bought off eBay are heads for the evo model for when the evos were vented through the crankcase not the head. Is this right?
Part two of this is supplying pcv to the heads. I have the S&S reed valve in place of the normal plastic camchest oil gear in the camchest and I am assuming I still need some sort of pcv in the heads in one form or another...correct?
This is on my 1996 Electra Glide with the 80 inch evo
Now after I did all this I put a light down the heads top end breather bolt hole and saw a solid end on the inside of it. Thinking I was just not seeing where the breather hole traveled into the head I put my mouth on it and blew and sure enough...no where for the air to go.
So I think I have arrived at a understanding and maybe I am right maybe I am wrong...please educate me. What I bought off eBay are heads for the evo model for when the evos were vented through the crankcase not the head. Is this right?
Part two of this is supplying pcv to the heads. I have the S&S reed valve in place of the normal plastic camchest oil gear in the camchest and I am assuming I still need some sort of pcv in the heads in one form or another...correct?
This is on my 1996 Electra Glide with the 80 inch evo
Road Master
Joined: Feb 2014
Posts: 913
Likes: 5
From: indiana
Hi everyone....so... I recently purchased some evo heads on eBay for $125. Great deal considering they came complete with everything. I have torn them apart and cleaned them and they are in great condition. They're not reassembled yet.
Now after I did all this I put a light down the heads top end breather bolt hole and saw a solid end on the inside of it. Thinking I was just not seeing where the breather hole traveled into the head I put my mouth on it and blew and sure enough...no where for the air to go.
So I think I have arrived at a understanding and maybe I am right maybe I am wrong...please educate me. What I bought off eBay are heads for the evo model for when the evos were vented through the crankcase not the head. Is this right?
Part two of this is supplying pcv to the heads. I have the S&S reed valve in place of the normal plastic camchest oil gear in the camchest and I am assuming I still need some sort of pcv in the heads in one form or another...correct?
This is on my 1996 Electra Glide with the 80 inch evo
Now after I did all this I put a light down the heads top end breather bolt hole and saw a solid end on the inside of it. Thinking I was just not seeing where the breather hole traveled into the head I put my mouth on it and blew and sure enough...no where for the air to go.
So I think I have arrived at a understanding and maybe I am right maybe I am wrong...please educate me. What I bought off eBay are heads for the evo model for when the evos were vented through the crankcase not the head. Is this right?
Part two of this is supplying pcv to the heads. I have the S&S reed valve in place of the normal plastic camchest oil gear in the camchest and I am assuming I still need some sort of pcv in the heads in one form or another...correct?
This is on my 1996 Electra Glide with the 80 inch evo
Intermediate
Joined: Dec 2014
Posts: 40
Likes: 0
From: Indy
What years were bottom breathers and what years were top? I have a '85, and it blows (or sucks) air and leaks oil through the front rocker box gaskets. I had the valve guides replaced and I don't remember that happening before.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Have you checked your front rocker boxes for warpage?
Intermediate
Joined: Dec 2014
Posts: 40
Likes: 0
From: Indy
No, I didn't, but I will. It doesn't look like there's a gap or anything and I guess I never really thought they could warp. I should have been more specific. It seems to be coming from between the bottom and the middle piece of the rocker box. I'm going to take it back apart and put cork gaskets back in it anyway, so I'll check then. Thanks for the reply.
Seasoned HDF Member
Joined: Apr 2011
Posts: 6,185
Likes: 2,134
From: W. Texas
Hi everyone....so... I recently purchased some evo heads on eBay for $125. Great deal considering they came complete with everything. I have torn them apart and cleaned them and they are in great condition. They're not reassembled yet.
Now after I did all this I put a light down the heads top end breather bolt hole and saw a solid end on the inside of it. Thinking I was just not seeing where the breather hole traveled into the head I put my mouth on it and blew and sure enough...no where for the air to go.
So I think I have arrived at a understanding and maybe I am right maybe I am wrong...please educate me. What I bought off eBay are heads for the evo model for when the evos were vented through the crankcase not the head. Is this right?
I almost did the same thing. Caught the difference before the heads were shipped. The fella was willing to let me outta the deal. On several recommendations I did that and got the correct stuff . Good luck
WP
Part two of this is supplying pcv to the heads. I have the S&S reed valve in place of the normal plastic camchest oil gear in the camchest and I am assuming I still need some sort of pcv in the heads in one form or another...correct?
This is on my 1996 Electra Glide with the 80 inch evo
Now after I did all this I put a light down the heads top end breather bolt hole and saw a solid end on the inside of it. Thinking I was just not seeing where the breather hole traveled into the head I put my mouth on it and blew and sure enough...no where for the air to go.
So I think I have arrived at a understanding and maybe I am right maybe I am wrong...please educate me. What I bought off eBay are heads for the evo model for when the evos were vented through the crankcase not the head. Is this right?
I almost did the same thing. Caught the difference before the heads were shipped. The fella was willing to let me outta the deal. On several recommendations I did that and got the correct stuff . Good luck
WP
Part two of this is supplying pcv to the heads. I have the S&S reed valve in place of the normal plastic camchest oil gear in the camchest and I am assuming I still need some sort of pcv in the heads in one form or another...correct?
This is on my 1996 Electra Glide with the 80 inch evo
WP
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
No, I didn't, but I will. It doesn't look like there's a gap or anything and I guess I never really thought they could warp. I should have been more specific. It seems to be coming from between the bottom and the middle piece of the rocker box. I'm going to take it back apart and put cork gaskets back in it anyway, so I'll check then. Thanks for the reply.
I kept changing rocker box gaskets but it never got any better.
It actually got worse every time I changed gaskets.
When I finally checked I found the middle rocker box was warped.
After I fixed that everything has been fine.
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Intermediate
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