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Member
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Location: Indiana | I am rebuilding a '55 270 Poly engine. It was disassembled long ago, and I had a check ball and cage in with the oil pump, pump driveshaft, and oil pan bolts. I can't remember removing it. I cannot find any mention of a check valve in the Dodge manual, and there was no replacement o-ring for it in the gasket kit. It does seem to fit in the oil galley bore in the block beneath the rear main cap leading from the oil pump. Does anyone know if this is where it belongs? |
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Member
Posts: 10
Location: Indiana | Here's a pic
Edited by gcrind 2013-04-01 12:23 PM
 (D55checkvalve 002.jpg)
 (D55checkvalve 001.jpg)
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D55checkvalve 001.jpg (24KB - 147 downloads)
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Member
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Location: Indiana | Ok, I figured out that this is the correct location for the check valve/ anti drain back. My question now is, is there an upper part to this that should be able to be removed? It seems to be frozen in place if it is. I am running the stock cartridge type oil filter. |
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Account deactivated by owner's request
  
Location: On this barrel | I found this picture on the net, it's a little different than yours but might be of some help.
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Member
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Location: Indiana | Thanks, I found that one too, so I know the that's where it goes. But I also found this picture/diagram of how it goes in the hole with another piece that has a spring in it. So now I'm wondering if it works as a bypass, or if it is just for the anti-drain back. I can't get that other half out of the block. I've tried tapping with a brass rod down through the oil pressure fitting hole, and nothing is moving. It sounds solid. Will I be ok if I just put the check valve in and run it?
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Account deactivated by owner's request
Location: On this barrel | It's my understanding that these aftermarket check valves eliminate the oil bypass function, converting the block full flow.
http://www.hothemiheads.com/dodge/oiling_system/oil_bypass_plug.htm...
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Walter passed away on Jul 29, 2014. We will miss you, Walt!
Posts: 5358
 
Location: Heaven Above (Formerly Oklahoma City,OK) | You might want to check with Bob Walker at HemiHotHeads. He's a guru on Mopar V8s of the era. My '55 270 Hemi did not have one . . . . . . . |
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | Most 241-260 Dodge and 276-291 DeSoto blocks were not drilled for the valve assembly. Most 270 seem to be using the valve assembly but never say 'never' with MaMopar....if the subject block is not drill through it is not a big surprise.
Once the block is clean it is real easy to shine a light into the port feeding the oil filter and see tooling marks at the bottom of the hole...looking into from the bottom. |
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Veteran
Posts: 120
Location: Bryan, TX | I have a 1956 Dodge 270 Poly and I don't recall mine even having a check valve. I am in the process of reassembling the engine and have already put the rear main cap on so I can't tell. Now you have me wondering if it was in there when I took the block to the machine shop for cleaning. Did some not have the check valve? |
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Expert
Posts: 3031
Location: N.W. Fla. | At least some of the long tail version of the 331 wasn't drilled through. It not a "by pass" even though many call it that. It's an anti-drain back check ball. When you crank up it's forced up into the passage, when you shut down it drops down and blocks oil from draining from the OEM type filter. If you convert to a spin on type filter that check ball is no longer needed because the spin on has its own anti-drain back. With the OEM filter you need the check ball operating right to keep oil in the filter. |
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| You should check with Bob Walker at HemiHotHeads. There was something I recall about the original being a filter bypass system and converting later to a full flow filter. Bob would know and have the oily bits to sort it and put it all in good nick.
Edited by rbmain 2013-05-13 3:57 AM
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | Jeff, the 1955 270 Poly engine got the Autolite distributor IAZ 4003G, which is a very GOOD dissie.
It is designed to have 4 degrees of engine (Initial-) advance dialed into it, because it has 32 degrees of Mechanical
Advance built into it, for a total mechanical advance of 36 degrees, and with an OEM Vacuum Advance providing
up to 8 degrees, for a Total Advance of 44 degrees.
You should consider sending your dissie to a rebuilder who can put your guy onto a diagnostic machine, so that a
proper lighter-weight spring could be installed, to replace its OEM heavier-weight, secondary, spring.
This way, you will have two light-weight springs, working together properly, to provide for the full 36 degrees of M.A. at
a range of about 2800 RPM, instead of at the about 3500 RPM range which the OEM heavier spring is providing (or,
rather, 'not' providing-for), currently.
Your dissie is also a dual points guy, so you can buy a Pertronix under-cap (hidden-) electronic ignition system (model 1383)
and have that be installed in your your hot-rodded dissie, too.
Also, your dissie-doc can shorten the cam's 32 degrees to something like 28-30, so that you could dial-
in some more Initial Advancement, like 6-8, so that the start-up acceleration (which is provided by the
I.A.) can be quicker.
Edited by d500neil 2013-05-13 2:29 AM
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Expert
Posts: 3031
Location: N.W. Fla. | d500neil - 2013-05-12 8:50 PM
Jeff, the 1955 270 Poly engine got the Autolite distributor IAZ 4003G, which is a very GOOD dissie.
It is designed to have 4 degrees of engine (Initial-) advance dialed into it, because it has 32 degrees of Mechanical
Advance built into it, for a total mechanical advance of 36 degrees, and with an OEM Vacuum Advance providing
up to 8 degrees, for a Total Advance of 44 degrees.
You should consider sending your dissie to a rebuilder who can put your guy onto a diagnostic machine, so that a
proper lighter-weight spring could be installed, to replace its OEM heavier-weight, secondary, spring.
This way, you will have two light-weight springs, working together properly, to provide for the full 36 degrees of M.A. at
a range of about 2800 RPM, instead of at the about 3500 RPM range which the OEM heavier spring is providing (or,
rather, 'not' providing-for), currently.
Your dissie is also a dual points guy, so you can buy a Pertronix under-cap (hidden-) electronic ignition system (model 1383)
and have that be installed in your your hot-rodded dissie, too.
Also, your dissie-doc can shorten the cam's 36 degrees to something like 28-30, so that you could dial-
in some more Initial Advancement, like 6-8, so that the start-up acceleration (which is provided by the
I.A.) can be quicker.
Up on the HAMB there's a guy called GMCBubba who's supposed to be real good with early dizzys. |
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Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!
Posts: 19146
Location: bishop, ca | GMC: "Got a Mechanic Coming"?
GMC Bubba: what could go wrong?
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Expert
Posts: 3031
Location: N.W. Fla. | d500neil - 2013-05-12 9:46 PM
GMC: "Got a Mechanic Coming"?
GMC Bubba: what could go wrong?
Yeah, not an inspiring "name". but the guys supposed to be a whiz with the 50s dizzys. |
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1955 Dodge Royal 270 Poly - check valve??
