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#1
02-12-2013, 10:02 PM
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400 heads without the front exhaust manifold holes?
What the heck. Do i have to track down an origional exhaust manifold for this head? I think its a 7j2 casting. This motor is a runner, just to install on my lemans so i can cruise this spring/summer while i rebuild my 455. I need some insight. thanks.
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1968 pontiac lemans 400. 13.16@102/8.5:1 /6x-4/lunati bm 2 cam/ 3500 stall/3.55 gears. |
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#2
02-13-2013, 12:15 AM
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'72 heads are like that. No outer exhaust bolt holes. Don't need to worry about it unless you are running headers. Just put the 4 bolts in normally.
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#3
02-13-2013, 01:21 AM
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can u use any exhaust manifolds? i dont have the origionals to theses heads.
.
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1968 pontiac lemans 400. 13.16@102/8.5:1 /6x-4/lunati bm 2 cam/ 3500 stall/3.55 gears. |
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#4
02-13-2013, 09:23 AM
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Yes you can.
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#5
02-13-2013, 10:47 AM
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Some one was making adaptors for installing headers or non 72 manifolds with the outer bolt holes. But I can not seem to remember who, or find them on a google search.
But they used angle brackets that bolted to the block and had the required stud attched to them. Maybe someone else can remember who made them. I was going to use them, but then decided to use a differnt set of heads that I had that had the outer holes.
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Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
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#6
02-13-2013, 10:53 AM
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Paul Spott sold them.
You can make your own with some angle steel and some bolts/nuts. Do a search on them. 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#7
02-13-2013, 11:53 AM
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I really would like know what Pontiac was thinking when they did that. I'm not an engineer, but WTF!!! It doesn't even make sense, and is certainly counter intuitive. Ok, even if they didn't drill them....but to eliminate the boss totally?
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars |
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#8
02-13-2013, 12:39 PM
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Quote:
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#9
02-13-2013, 12:49 PM
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Pontiac Dude has the adapters.
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#10
02-14-2013, 11:20 AM
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Quote:
__________________
1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars |
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#11
02-14-2013, 12:31 PM
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Yep. Just use the regular manifolds. As has been said, you can drill the heads. The hole will go into the head bolt hole. No biggie. Use a stud with some hi-temp LocTite.
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1969 GTO hard top ~ Std bore 400, '70-RA3 block, 670 heads, Bal. & Blue... M22, 12-bolt w/3:55s Last edited by GRX; 02-14-2013 at 12:45 PM. Reason: pic added |
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#12
02-14-2013, 12:34 PM
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Quote:
Quote:
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1969 GTO hard top ~ Std bore 400, '70-RA3 block, 670 heads, Bal. & Blue... M22, 12-bolt w/3:55s |
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#13
02-14-2013, 01:41 PM
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I doubt it since not all heads were done this way. And shortly thereafter, when the heads were reduced to 4X and 6X the bosses AND holes were back. And what about the other brands? I would chalk it up to bean counting which is probably worse than anything in the Clean Air Act.
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 ___________________________________ "Objects in mirror are closer than they appear" 
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#14
02-14-2013, 02:20 PM
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^^ Good point about bean counters. Perhaps it was both. Anyone know if factory manifolds mated to these heads also lacked the outer bolt holes?
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1969 GTO hard top ~ Std bore 400, '70-RA3 block, 670 heads, Bal. & Blue... M22, 12-bolt w/3:55s |
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#15
02-14-2013, 05:08 PM
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Factory manifolds lacked the bolt holes too:
 
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#16
02-14-2013, 05:26 PM
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i had a '71 the car was untouched and fine, but massive exhaust leaks right there. That car had #96 heads which were drilled but the manifolds were not provisioned for bolts. A set of Dougs fixed that.
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#17
02-14-2013, 07:52 PM
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about "holes" and what they cost: tons of engines were built with holes drilled and tapped for 4 bolt mains that they were never gonna get, right? I know that stopped along with the outer exhaust holes.
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#18
02-14-2013, 09:09 PM
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The warranty claims for exhaust leaks might have caused them to reconsider?
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#19
02-14-2013, 09:21 PM
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Idiots! What's next cast rods?
__________________
1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars |
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