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What's the purpose of this port on 906/452 heads?

Started by bull, November 12, 2009, 01:33:27 AM

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bull

Sorry if this is a dumb question but I was looking at this one horseshoe-shaped port on some 906 heads and wondering what its purpose is other than to collect dirt? It doesn't seem to go anywhere so what's it for?


Dans 68

No purpose, I believe. The below photo of another 383 build-up shows that area is painted and thus inert (no oil or coolant access) to any engine mechanical function.

Dan
1973 SE 400 727  1 of 19,645                                        1968 383 4bbl 4spds  2 of 259

bull

Well, now that picture's got me wondering about the valley. Is that area typically painted?

Dans 68

I don't think it matters. This engine was obviously taped off at all the important areas, and spray painted. My take on it is that it is simply a preference of the builder. I have attached another of the build, and the link to the photos and article. http://www.hotrod.com/techarticles/engine/hrdp_0711_mopar_383/photo_01.html

Dan
1973 SE 400 727  1 of 19,645                                        1968 383 4bbl 4spds  2 of 259

Rolling_Thunder

it is to catch the nuts you use to hold the carb down...          :flame:
1968 Dodge Charger - 6.1L Hemi / 6-speed / 3.55 Sure Grip

2013 Dodge Challenger R/T - 5.7L Hemi / 6-speed / 3.73 Limited Slip

1964 Dodge Polara 500 - 440 / 4-speed / 3.91 Sure Grip

1973 Dodge Challenger Rallye - 340 / A-518 / 3.23 Sure Grip

bull

Quote from: Rolling_Thunder on November 12, 2009, 03:31:19 AM
it is to catch the nuts you use to hold the carb down...          :flame:

Funny you say that because I recently found a "spare" nut in one of mine.

tan top

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lisiecki1

Quote from: bull on November 12, 2009, 02:39:31 AM
Well, now that picture's got me wondering about the valley. Is that area typically painted?

I high temp coat the inside of the blocks on the engines I build, I read somewhere that it helps the oil drain back quicker since it's running down a slicker surface  :Twocents:
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The average response time of a 357 magnum is 1400 FPS.

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68r/t

Quote from: bull on November 12, 2009, 02:39:31 AM
Well, now that picture's got me wondering about the valley. Is that area typically painted?

The painted valley is sometimes done by hotroders so the oil can return back to the sump a little quicker, same as some people polish the same areas with a die grinder.

The port on the head seams to be a air gap around the exhaust crossover, it is a good dirt collector.

Nacho-RT74

Quote from: Rolling_Thunder on November 12, 2009, 03:31:19 AM
it is to catch the nuts you use to hold the carb down...          :flame:

also carb clips, retainers... LOL ( BTDT )
Venezuelan RT 74 400 4bbl, 727, 8.75 3.23 open. Now stroked with 440 crank and 3.55 SG. Here is the History and how is actually: http://www.dodgecharger.com/forum/index.php/topic,7603.0/all.html
http://www.dodgecharger.com/forum/index.php/topic,25060.0.html

bull

Well, I guess the main purpose of this port is for heat dissipation. That's all I can think of. :shruggy:

Nacho-RT74

Venezuelan RT 74 400 4bbl, 727, 8.75 3.23 open. Now stroked with 440 crank and 3.55 SG. Here is the History and how is actually: http://www.dodgecharger.com/forum/index.php/topic,7603.0/all.html
http://www.dodgecharger.com/forum/index.php/topic,25060.0.html

375instroke

It's a thermal break to reduce the exhaust heat from entering the head.

Challenger340

Quote from: 375instroke on November 12, 2009, 07:16:06 PM
It's a thermal break to reduce the exhaust heat from entering the head.

What he said !

The small oval/round port is the Exhaust Heay Crossover, where HOT exhaust gases are actually channelled "UP" under the Intake to warm the Carb.
The "Horse shoe" port above it is as 375INSTROKE said, thermal Break between the crossover and the rest of the Head.
Only wimps wear Bowties !