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#1
05-02-2025, 01:12 PM
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Exhaust Manifold bolts for Firebird 1978
Greetings!
Sorry to bother you but I failed to find the response so far, so I'm reaching to you. I buy not long ago a Pontiac Firebird Trans AM of 1978 (the engine is a Pontiac 400) I had to do the head gasket and so replace the exhaust manifold gasket of course. I also replace the bolts that was there by exactly the same: - Diameter: 3/8 Thread: UNC Size: 1"1/2 Quantity: 12 https://www.transfixations.fr/fr/vis...tre-3_8_9525mm - Diameter: 3/8 Thread: UNC Size: 1"3/4 Quantity: 2 https://www.transfixations.fr/fr/vis...tre-3_8_9525mm But I think that those bolts are not the corrects one, they seen to be a bit short and holding only on a few threads... I live in France so I cannot go to the store to test what would fit the best, i would like some help to get the size right, if anyone as the info  Thanks in advance! |
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#2
05-02-2025, 01:42 PM
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Those bolts in the links you provided are NOT CORRECT.
As well, AMES PERFORMANCE does NOT have the right kit for a 1978 stock exhaust manifold, even though their catalog lists it. I know this from experience, having ordered their kit. The 1978 does NOT have a combination of long and short bolts holding the manifolds to the engine. They are all one length. You are better off ordering this: https://www.ebay.ca/itm/312906392252
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"Spend all your time and money on that Pontiac GTO pile" - The Go-Gos, 1981 |
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#3
05-02-2025, 02:58 PM
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My 78 bolts were also hollow.
__________________
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-sold 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#4
05-02-2025, 05:32 PM
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Hello thx for the replies!
Yes I read somewhere during my recherche that the bolts might be hollow to handle dilatation. On the link shared by @starlightblack I'm not sure if they are hollow or not. But I guess I will for for them (except if someone has a contraindication) |
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#5
05-03-2025, 10:29 AM
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And hollow ones are easier to break off when rust seized!
__________________
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-sold 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#6
05-05-2025, 12:51 PM
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^^^ But also easier to drill through, haha.
__________________
1979 Trans Am W72 400/4-Speed WS6 - Starlight Black Hardtop  |
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