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
From: neal zimmerman
Sent: Tuesday, August 09, 2016 4:03 PM
To: 1962to1965mopars
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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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_ .disclaimer.html
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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_ .disclaimer.html
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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_ .disclaimer.html
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Please address private email -- email of interest to only one person -- directly to that person. That is, email your parts/car transactions and negotiations, as well as other personal messages, only to the intended recipient. Do not just press "reply" and send your email to everyone using the general '62-'65 Clubhouse public email address. This practice will protect your privacy, reduce the total volume of mail and fine-tune the content signal to Mopar topic. Thanks!
1962 to 1965 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_ .disclaimer.html
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