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I orderd the valley pan w/o the hole, but recieved with it. It was mislabled at the factory, so I cut a soda can with a pair of scissors, making 4 plugs to sandwich them on each side of the pan.
I held them together with RTV and sealed the perimiters.....works great!

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I used a alum soda can,it burnt thru in short order. way to thin. may have better results with 2 stacked like that.

cut some from the old vally pan and rtv them in place on the head, then the install the gasket/pan/gasket/intake.

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i remember a story of Herb Mc Candles melting down old pistons and pouring it into heads to block off heat riser holes.....

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Balled up big wads of aluminum foil and stuffed them down in there. Crude and effective, kind of keeping with these old Mopars' spirit.

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I remember someone on this board post about stuffing it with 100 dollor bills along with that alum foil,so it would pay hiim for the rebuilding of the heads.

ask my buddy that is waiting for his 4oo BB heads back from the machine shop after spitting the alum out the header collectors

results will vary.

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Here's a q - what's the effective difference of just wiring the riser valve wide open? Won't exhaust velocity take care of most of it?

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Here's a q - what's the effective difference of just wiring the riser valve wide open? Won't exhaust velocity take care of most of it?

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We're talking about the water crossover in the intake manifold...

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Here's a q - what's the effective difference of just wiring the riser valve wide open? Won't exhaust velocity take care of most of it?

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We're talking about the water crossover in the intake manifold...

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Uhh, bigblocks have dry intakes...

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Mopar Performance had offered an intake manifold gasket with two thick (.040-.050) shims to block the heat crossover on small blocks.

I never used this kit due the the shims being so thick. What I do is find a large aerosol can and cut my own shims. The ones I have used where about .011 thick. I have done this MANY times and never had a problem.

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I used the MP block offs on my 360. Guess where all my oil was going? I pulled the intake and cut a recess in it for the plates. Glued them in with copper RTV. BTW the gasket they sell is a thin POS.

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Enjoy your nice vacation...

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Thank, you, Mr Mod. We all have differences of opinion on things, but to say stuff like that over a crossover??? What's wrong with that guy???

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Enjoy your nice vacation...

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Thank, you, Mr Mod. We all have differences of opinion on things, but to say stuff like that over a crossover??? What's wrong with that guy???

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got me?

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Here's a q - what's the effective difference of just wiring the riser valve wide open? Won't exhaust velocity take care of most of it?

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Here's a q - what's the effective difference of just wiring the riser valve wide open? Won't exhaust velocity take care of most of it?

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Yes, but at this point, 35+ years later, most of them are probably frozen open already.

There's 2 parts to this system. The crossver between the heads that runs thru the intake (which we are discussing) and then the riser valve that reroutes the passenger-side exhaust thru that passage.

In my experience, having no riser valve still allows a lot of intake heating to occur.

I installed the blocked intake pan on one of my cars once and got a *terrible* resonance around 2000 RPM, couldn't even drive the car more than once. (2.5" X-pipe exhaust)

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a old timer told me that the cross over also acts like a H-pipe to balance the exhast pulse from right bank to left bank with a single exhast. how true that is I dont know?

opinions? would it in fact do that?

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a old timer told me that the cross over also acts like a H-pipe to balance the exhast pulse from right bank to left bank with a single exhast. how true that is I dont know?

opinions? would it in fact do that?

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We can discuss opinions now that Iron Wolf can't hear us.

I've heard somehting like that, perhaps on here. It would stand to reason that an additional passage could change the resonance frequencies.

I don't know what a jumper tube between 2 pipes on a church organ would do, but it will surely do something.

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blocking the intake manifold heat cross over on a car with separate dual exhaust pipes, no "h" or "x", will have an effect on exhaust tone. i used to do this on my road runner back in the day. it had a pretty cool lope with a little bit of camshaft.

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