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#1
12-24-2023, 10:38 AM
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Header Bolts
I have a 1977 Pontiac 400, 6.6 engine. I'm going nuts trying to find the type and dimensions of the original bolts that hold the original Y pipe to the manifold. Seems to be so many choices. Any help will be greatly appreciated. Thanks in advance for any assistance.
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#2
12-25-2023, 10:16 AM
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Sorry, I saw header bolts as the title and was going to give a suggestion for some good low priced header bolts... cant help with Y pipe to manifold bolts. Didnt they use studs in the manifold at that location?
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#3
12-25-2023, 02:58 PM
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I wish I could remember if they were studs or bolts. It was over 20 years ago and though I wrote almost everything down that's one of the things I missed. I do have bolts that are still taped to the catalitic converter from that end of the pipe. Maybe tomorrow I'll see if those bolts will also bolt up to the engine. At least its a starting point. Thanks for responding.
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#4
12-25-2023, 07:01 PM
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Pretty sure studs vs bolts esp the side that has the heat block off flapper.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#5
12-25-2023, 07:18 PM
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OK, please go slow. Skip Fix, are you saying you believe the engine side of the pipe had studs?
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#6
12-25-2023, 10:14 PM
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I believe they were studs also. I remember most GM exhaust manifolds had studs.
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#7
12-26-2023, 10:24 AM
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Yes engine side- studs. I have my originals form my 180 HP motor I'll look at and pull out the shop manual also.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#8
12-26-2023, 12:30 PM
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Skip Fix, Thank you so much for your help.
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#9
01-25-2024, 05:03 PM
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Looked this last weekend and 3 studs both sides.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#10
02-01-2024, 09:22 PM
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engine side are studs, Cat side is a bolt and crimp nut.
__________________
1979 Firebird Trans Am 301/4spd (Now 428) 1977 Firebird Formula 400/Auto 2007 Grand Prix GXP 5.3L |
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