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 heads and headers
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Jeff Perna
Tribal Scout

3 Posts

Posted - 05 May 2013 :  6:24:00 PM  Show Profile  Reply with Quote
I have a 1697 GTO WITH A 400 MOTOR WENT TO PUT ON HEADERS AND FOUND OUT I ONLY HAVE 4 BOLTS PATTERN ON HEADS AND EXHAUST MANIFOLDS AND ALWAYS LEAKING.I WOULD LIKE TO PUT MY HEADERS ON ANT SUGGESTIONS.THE HEAD CASTING IS NO.16.I DONT WANT TO PULL THE HEADS.THE MOTOR IS IN..IF I HAVE TO PULL THE HEADS I PREFFER TO BUT SOME PERFORMANCE HEADS,,
ANY INFO WOULD HELP
JEFF

Blued and Painted
Chief PONTIAC

USA
2553 Posts

Posted - 05 May 2013 :  9:33:42 PM  Show Profile  Reply with Quote
I thought the 16 heads had the standard 6 bolt holes. Bill B, What is the name of those good header gaskets you guy,s have been using.

Bull Nose Formula, 461, R44TS, DEX/MERC
69 GTO-400/670/373/4Spd

Edited by - Blued and Painted on 05 May 2013 9:36:22 PM
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cortcomp
Coyote

USA
4383 Posts

Posted - 05 May 2013 :  9:42:46 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
Remflex right?
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Bill Boyle
Horse Feathers (Charter Member)

USA
4014 Posts

Posted - 06 May 2013 :  07:05:17 AM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
Right!

"Dedicated to keeping the classic Pontiac engine alive."

----
400 bored +.030, forged TRW pistons, ported 62 heads, Heddman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.
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Jeff Perna
Tribal Scout

3 Posts

Posted - 06 May 2013 :  09:46:34 AM  Show Profile  Reply with Quote
I know either I need to pull the heads and have the forward and aft holes machined in ,or go back with the orginal exhaust manifolds.If I decide to pull the heads,Im asking what would be a good performance heads to replace.And the remflix gaskets,what about the copper rtv silicone,I hear that work better.Ths for all the input.
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Bill Boyle
Horse Feathers (Charter Member)

USA
4014 Posts

Posted - 06 May 2013 :  12:58:35 PM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
Hmm....I don't think I've ever seen a 16 head with only 4 bolts for the exhaust manifold. Jeff, are you certain these are really 16 heads and not something else? Could it be your log manifold that just has a 1 fore/aft inside bolts and two inside bolts?

(Question was edited for clarity).

Bill

"Dedicated to keeping the classic Pontiac engine alive."

----
400 bored +.030, forged TRW pistons, ported 62 heads, Heddman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.

Edited by - Bill Boyle on 06 May 2013 1:16:04 PM
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Blued and Painted
Chief PONTIAC

USA
2553 Posts

Posted - 06 May 2013 :  2:10:52 PM  Show Profile  Reply with Quote
I have seen when a TOO LONG exhaust bolt is used in the outer bolt hole. It will bottom out on the head bolt and pop off the corner of the exhaust flange.

What's the numbers on those heads without those outer bolt holes?

[/URL]

Bull Nose Formula, 461, R44TS, DEX/MERC
69 GTO-400/670/373/4Spd
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Jeff Perna
Tribal Scout

3 Posts

Posted - 06 May 2013 :  6:15:03 PM  Show Profile  Reply with Quote
Yes the casting no. is 16 the only other no. on the heads is D280 Which is the date.I have ck many website on codes and it a 70s head
Ive been told through a GTO Club member that that did Pontiac did that to save money,but then they made tabs for the 4 bolts to keep them from turning,which was on them originaly
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Latech
Cochise

USA
371 Posts

Posted - 26 May 2013 :  4:50:51 PM  Show Profile  Reply with Quote
I forget who sells them, but there are brackets for the end holes that are missing to allow the use of headers.
You can make them yourself as well.
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Merrik66
Cochise

USA
294 Posts

Posted - 30 May 2013 :  11:34:22 AM  Show Profile  Reply with Quote
1972 was the year without the end bolt holes, why pontiac did that I don't know. But, they knew they made a mistake as they changed it back the very next year.
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Phil
The Great White Buffalo

USA
6434 Posts

Posted - 30 May 2013 :  11:51:16 AM  Show Profile  Reply with Quote
Spotts Performance sells the brackets.

"Chevy": even the name sounds cheap.
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loosetappet
Tribal Scout

27 Posts

Posted - 03 Oct 2014 :  08:33:56 AM  Show Profile  Reply with Quote
Just reading this old thread and I'm wondering which heads came from the factory without 6 threaded holes for the manifolds/headers? Anyone have a list? Or an online source? thanks
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bnorris_74
Crazy Horse

USA
1415 Posts

Posted - 03 Oct 2014 :  10:17:17 AM  Show Profile  Reply with Quote
quote:
Originally posted by loosetappet

Just reading this old thread and I'm wondering which heads came from the factory without 6 threaded holes for the manifolds/headers? Anyone have a list? Or an online source? thanks


I know that the 1972 7K3 and 7M5 heads only had four exhaust bolt holes. Pretty sure all the 72 models had 4 bolt holes.

Someone once posted on one of the forums that 72 to 74 were 4 bolt only but that's not true. My 1974 #46 heads that came on my 350 has 6 bolt holts for the exhaust.

Brian
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