Quote:
Seems like a good way to lighten up the Peanut head
that is a good idea 
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| Hydro head oil return / pushrod hole size. https://www.slantsix.org/forum/viewtopic.php?t=62946 |
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| Author: | Greg Ondayko [ Mon Oct 22, 2018 1:36 pm ] |
| Post subject: | Hydro head oil return / pushrod hole size. |
What is the stock size for pushrod holes /oil return holes on an 81 and newer hydro head? Thanks, Greg |
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| Author: | Dart270 [ Mon Oct 22, 2018 2:25 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
A little bigger than a 0.904" lifter, but do not know actual. Probably 1.05" or so. Will try to remember to measure tonight or tomorrow... Lou |
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| Author: | Greg Ondayko [ Mon Oct 22, 2018 3:41 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
No need to measure.. so from the factory waay bigger than the 76-80 cast solid lifter peanut head.... Right? Greg |
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| Author: | slantzilla [ Mon Oct 22, 2018 4:04 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
Yes, if you have a very steady hand you can pull the lifters out. |
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| Author: | DadTruck [ Mon Oct 22, 2018 6:56 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
I have an 87 head on the work bench, using a telescoping gauge and a hand caliper I got .950 for the pushrod holes |
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| Author: | Greg Ondayko [ Mon Oct 29, 2018 7:36 am ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
Sounds good guys.. thanks, I never had seen inside a Hydro Head and wasn't sure if someone machined out the head for additional pushrod clearance. Seems like a good way to lighten up the Peanut head however. Greg |
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| Author: | DadTruck [ Mon Oct 29, 2018 6:02 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
Quote: Seems like a good way to lighten up the Peanut head
that is a good idea
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| Author: | slantzilla [ Mon Oct 29, 2018 6:26 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
IF you don't run into water......... |
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| Author: | Greg Ondayko [ Mon Oct 29, 2018 7:21 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
Yep. I dont think there is water out there by the spark plugs and push rods.. never was any there on the open deck 60-75 heads. I guess you never know. Greg |
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| Author: | slantzilla [ Mon Oct 29, 2018 8:53 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
I do not know. I've never cut one apart. |
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| Author: | Greg Ondayko [ Tue Oct 30, 2018 5:18 am ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
Well time to stock up on peanut heads and buy a bridgeport. Greg |
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| Author: | DadTruck [ Tue Oct 30, 2018 7:11 am ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
Quote: never was any there
we all know the ports never changed much,so it is not likely that the external configuration of the water jacket changed over the years. the only obvious water jacket change was the addition of more deck side water openings. My guess is that by the 80's Chrysler finally figured out that core sand was cheaper than gray iron. |
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| Author: | and739 [ Thu Nov 15, 2018 6:55 am ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
There's a pic of a cut-open peanut head showing the location of the water jacket on the Engine FAQ page. http://www.slantsix.org/forum/viewtopic.php?t=38622 |
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| Author: | Greg Ondayko [ Fri Nov 30, 2018 2:53 pm ] |
| Post subject: | Re: Hydro head oil return / pushrod hole size. |
Well based on the sawed head that doc had done.. I guess it is possible to hit water.  But I think the idea would work. Maybe the water jacket wall was moved toward the valves on the hydro head as there is a lot more open deck on the bottom of the head compared to the tube and peanut versions. Greg |
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