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tyrodtom View Drop Down
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Posts: 1145 		  Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Topic: engine build
    Posted: Jul/31/2010 at 9:57pm
  A lot of SBC racers use a valley pan  cover, it does double duty, It's a lttle bit heavier metal than the AMC valley pan, it also has projections on the side of the pan that keeps the lifters from flying out of their bores if you break a rocker arm stud, or pushrod.  It also keeps most of the hot oil from transferring heat to the bottom of the intake. It's just a valley pan cover though, it deesn't seal the intake ports.
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Posts: 7284 		  Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2010 at 9:59pm
Originally posted by tyrodtom

  A lot of SBC racers use a valley pan  cover, it does double duty, It's a lttle bit heavier metal than the AMC valley pan, it also has projections on the side of the pan that keeps the lifters from flying out of their bores if you break a rocker arm stud, or pushrod.  It also keeps most of the hot oil from transferring heat to the bottom of the intake. It's just a valley pan cover though, it deesn't seal the intake ports.
Ive never seen one, but I believe it.
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lugo likes ramblers View Drop Down
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Posts: 73 		  Quote lugo likes ramblers Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2010 at 10:07pm
all food for thought. i really dont mean to argue my own issue, but it really seems unnecessary to me. not saying im right at all. does anyone run gaskets? i mean they are made for a reason. not just because people dont like valley pans.
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Posts: 7284 		  Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2010 at 10:31pm
Originally posted by lugo likes ramblers

all food for thought. i really dont mean to argue my own issue, but it really seems unnecessary to me. not saying im right at all. does anyone run gaskets? i mean they are made for a reason. not just because people dont like valley pans.
By all means run gaskets if you want.  it is your engine after all.
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Posts: 73 		  Quote lugo likes ramblers Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2010 at 10:40pm
id just like a better reason is all. all im getting is to keep oil off the intake. itll get there one way or another and im no racer so a couple degrees difference means nothing to me.

gaskets it is
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amx39068 View Drop Down
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Posts: 4422 		  Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/01/2010 at 9:18am
Originally posted by lugo likes ramblers

all food for thought. i really dont mean to argue my own issue, but it really seems unnecessary to me. not saying im right at all. does anyone run gaskets? i mean they are made for a reason. not just because people dont like valley pans.
I run gaskets on any aluminum intake as the metal to metal to metal can result in corrosion on the aluminum intake.  Others have previously argued that they have run the valley pan gasket with aluminum intakes forever with no corrosion.  On the other hand I have taken apart too many engines where the water jacket areas looked like swiss chese. 
 
I agree that the problem may or may not be caused by the valley pan gasket but on the other hand, the individual type gaskets minimize the metal surface to surface contact between the corrosive prone aluminum intake and the rest of the block so I go with it in order to avoid a potential problem whether or not the valley pan gasket actually causes the problem.
 
You know the old saying, "an ounce of prevention is worth a pound of cure" or some such thing.  It just seems like common sense to me.


Edited by amx39068 - Aug/01/2010 at 9:19am
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tyrodtom View Drop Down
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Posts: 1145 		  Quote tyrodtom Quote  Post ReplyReply Direct Link To This Post Posted: Aug/01/2010 at 10:09am
   I cut the valley pan gasket right at the intake ports, and use the separate intake gaskets, best of both worlds.
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Posts: 4422 		  Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/01/2010 at 10:10am
I like that approach as well.
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PHAT69AMX View Drop Down
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Posts: 2278 		  Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Aug/01/2010 at 5:07pm
May I ask how much is cut out at the intake ports ?
Just the small strip across the intake port top ?
Or is there more than that cut out ?
Reckon the water port hole part is left on the cut valley pan ?
Have yet to mount an intake with both,
unsure just how much to actually trim the valley pan.
Picture ?
 
On the side that a Valley Pan is needed for Oil Control.
Pan is visible in this Engine Cross-Sectional diagram.
From this view, reckon there's a lot of oil splashin'round in that area under the pan.
And stock used the Intake PCV Baffle as well as the Valley Pan,
doesn't look to be any PCV Baffle represented in this section view.
 
Just noticed, diagram must be an earlier one re-used in a later TSM.
Caption says "360-401 CID Shown".......
Right Cyl Head section appears to show the early rectangular exhaust port head convex floor.
 
 
 


Edited by PHAT69AMX - Aug/01/2010 at 5:27pm

Link to a Short YouTube Burnout Video
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