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Late 60s HP exhaust manifolds

Started by femtnmax, December 05, 2011, 10:06:14 AM

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femtnmax

December 05, 2011, 10:06:14 AM
I was going to use the late 60's factory HP cast iron types.   I suppose its a gamble buying used ones.  Are there cracking issues with them like with the motor home 440 types?
Phil

pentastar426

#1
December 06, 2011, 12:22:29 AM
I bought repros from Year one.  I have not heard of cracking issues with the late 60's H.P. units, or with the repros.

maxwellwedge

#2
December 06, 2011, 11:02:37 AM
Buy used ones that aren't cracked or welded. The flange direction changed from 69 to 70....so watch out for that if you already have head pipes.

elacruze

#3
December 06, 2011, 11:29:19 AM
Quote from: femtnmax on December 05, 2011, 10:06:14 AM
I was going to use the late 60's factory HP cast iron types.   I suppose its a gamble buying used ones.  Are there cracking issues with them like with the motor home 440 types?

No cracking usually, but you should have them checked for warpage and have them corrected if not perfectly flat.
1968 505" EFI 4-speed
1968 D200 Camper Special, 318/2bbl/4spd/4.10
---
Torque converters are for construction equipment.

71bee

#4
December 07, 2011, 05:56:04 PM
I snagged a nice pair of used '70-'71 HP manifolds 3 years ago @ MoPars at the Strip. bolted 'em right up & have been running 'em ever since with no problems, other than the fact that my engine runs a little hotter than it did with the headers I had on it.

BTW, I was shocked at the nice rumble you get with the stock HP manifolds. they sound better than my ol' headers, plus, they don't leak!  :Twocents:

Sublime/Sixpack

#5
December 08, 2011, 08:29:10 PM
I've never had a problem with cracking on any of the Mopar HP manifolds that I have now or have had in the past.
1970 Sublime R/T, 440 Six Pack, Four speed, Super Track Pak

y3chargerrt

#6
December 09, 2011, 06:44:55 AM
I had a friend that had cracks in a 70 manifold. He had a leak that would not go away. He dropped the manifold to find a good sized crack in it.

Nacho-RT74

#7
December 09, 2011, 07:35:39 AM
chebby manifolds are the ones what cracks, not Mopars
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

greenpigs

#8
December 20, 2011, 01:20:16 AM
  I had a passenger side HP with a crack, so it happens. Like stated just inspect them and if you do not see a crack or repair work go for it. Also I do not have a link but knowing the casting number for the drivers side would be worth the effort of locating.
1969 Charger RT


Living Chevy free

Chargen69

#9
April 02, 2012, 11:17:03 AM
Quote from: greenpigs on December 20, 2011, 01:20:16 AM
I had a passenger side HP with a crack, so it happens. Like stated just inspect them and if you do not see a crack or repair work go for it. Also I do not have a link but knowing the casting number for the drivers side would be worth the effort of locating.

i had the same thing happen to mine
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