Re: blocking heat crossover
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Re: blocking heat crossover



working with a 340, haven't ever seen metal gaskets for these, Anyhoo i have a fel pro intake set i picked up this morning, haven't opened it yet, but assume they are "non-metal". As to the RTV which color?  copper? As to the intake gaskets do they  go on dry or with sealant? Dry as I recall.
    neal

On Wed, Aug 10, 2016 at 6:46 PM, <roland@xxxxxxxxxxxxxxxxx> wrote:

There’s a lot of reasons to block the crossover, especially with an aluminum manifold… The exhaust fumes are toxic to any metal but to aluminum especially…. Second, on this manifold  it has an egr valve that needs to be obliviated…. I use Edelbrock A-B epoxy and fill the manifold crossover inlet and outlet, stuffing the runner with aluminum foil to keep the epoxy use at a minimum and let it harden overnight… Then do the tin plate thing over the head port that is carrying the exhaust… We did a survey on several occasions asking the pros about filling that port as its really connected off of the exhaust valve and one might think that that port’s performance might suffer having that open hole available for turbulence etc… Most of the old salts do plug it up but never could see ANY performance loss or gain by doing it…

 

From: 1962to1965mopars@googlegroups.com [mailto:1962to1965mopars@googlegroups.com] On Behalf Of neal zimmerman
Sent: Wednesday, August 10, 2016 7:59 PM
To: 1962to1965mopars <1962to1965mopars@googlegroups.com>


Subject: Re: blocking heat crossover

 

whats the best way to block it?

   neal

 

On Wed, Aug 10, 2016 at 12:52 PM, DAVID ORR <fe2orr@xxxxxxxxxxxxxx> wrote:

Have my 426 street wedge  crossover blocked for 15 years and no problems either in Pa. or Fl.


From: "Gary Pavlovich" <glpavlovich@xxxxxxx>
To: 1962to1965mopars@googlegroups.com
Sent: Wednesday, August 10, 2016 3:44:31 PM
Subject: Re: blocking heat crossover

 

Neal,

 

On all my personal engines and engine builds I always block the heat crossover passage to prevent superheating the plenum which causes cracks over time in cast iron manifolds and can pose the same problem in aluminum intakes.  Second reason is to prevent superheating the plenum to increase power – factory designed this for easy startup in cold weather.  Our winter temps are teens, twenties and thirties and I never run a choke and always block the heat crossover; no issues at all in any of my engines and one has been performing admirably for thirty years.

Gary Pavlovich

 

Sent: Tuesday, August 09, 2016 4:03 PM

Subject: blocking heat crossover

 

What are u guys doing with heat crossover, blocked or open? Moderate winters where i live, typically 30s or 40s at worst, rarely below 30. Just wondering before I swap manifold to  eddy performer.

   neal zimmerman, eugene oregon

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Dave O

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1962 to 1965 Mopar Clubhouse Discussion Guidelines:
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