Posted By: 74RALLYE
Best way to block off exhaust crossover on a 440? - 01/24/12 06:36 PM
What's the best way to block off exhaust crossover on a 440 with iron heads and a Performer RPM intake?
I don't think I need the heat as this is a sunny day car.
Thanks.
Posted By: Mr.Yuck
Re: Best way to block off exhaust crossover on a 440? - 01/24/12 06:41 PM
get a valley pan w/o the holes in it. Or you can cut up and old one and block them off yourself.
Posted By: 74RALLYE
Re: Best way to block off exhaust crossover on a 440? - 01/24/12 06:43 PM
Just cut a rectangle and glue it in place?
Posted By: bboogieart
Re: Best way to block off exhaust crossover on a 440? - 01/24/12 06:50 PM
Mopar performance part number P4286825
Summit has it listed for $19.95
http://www.summitracing.com/parts/DCC-4286825/
Posted By: JohnRR
Re: Best way to block off exhaust crossover on a 440? - 01/24/12 06:57 PM
You should be able to buy it local thru felpro and save on the shipping .
Posted By: dOc !
Re: Best way to block off exhaust crossover on a 440? - 01/24/12 10:44 PM
I have never done it this way but I have had a Bud weld-in(tac-in) ONLY ON ONE SIDE a little square plate IN the intake cross-over port.
Posted By: 383man
Re: Best way to block off exhaust crossover on a 440? - 01/25/12 07:58 AM
I just have my intake welded up. Ron
Posted By: 451Mopar
Re: Best way to block off exhaust crossover on a 440? - 01/25/12 09:21 AM
Aluminum heads do a good job of removing that pesky crossover
Posted By: 74RALLYE
Re: Best way to block off exhaust crossover on a 440? - 01/25/12 01:45 PM
I like the idea of plugging the heads. It seems like that would keep more heat away from the intake. I may be able to have the ports on the intake welded shut instead as my heads are cast iron.
What driving conditions benefit from having the exhaust crossover open? Is it needed?
Posted By: lewtot184
Re: Best way to block off exhaust crossover on a 440? - 01/25/12 07:16 PM
thinking that using an aluminum head without a heat crossover will cure the intake manifold heat problem isn't true. people who buy aluminum heads don't put cast iron intakes on them,.. well normal people don't. aluminum soaks up and radiates heat. an aluminum intake will just soak the heat from the heads. if the head runs 180f the intake will be very close to that. 180f is too hot for today's fuels. i can only think of two paths to go here. heat spacer under the carb for summertime (manifold still gets too hot), or some intake manifold mods. take a que from the victor or air gap intakes. removing material from around the plenum can reduce heat transfer and let a little air circulate around the manifold. still no real world multi-purpose cure but a step in a "cooler" direction.
Posted By: lewtot184
Re: Best way to block off exhaust crossover on a 440? - 01/25/12 09:58 PM
john, plastics, phenolic or whatevers don't transfer or hold heat like metal. this isn't an apples to apples comparison. fuel injection, better designed induction, VVT, computers, no fuel bowls or related stuff laying stagnant. this is like comparing a mule to a thoroughbred. i stand by comments.
Posted By: bfury
Re: Best way to block off exhaust crossover on a 440? - 01/26/12 12:34 AM
This is old school cheap and dirty. I'm sure some will dismiss it but it works. Make an aluminum foil ball and push it into the crossover port in the head. Cut a rectangle of thin sheet metal to go over the crossover port and use a paper type gasket. It always worked.
& I'm gonna try it. I like mileage/cold weather driveability on my DD
