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#1 |
Registered User
![]() Join Date: Nov 2010
Location: Hollister Mo
Posts: 137
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What are these....
I hope my pictures got attached.....
I have what I thought are two identical 250 engines, but I notice that one of the heads has 6 bolts coming off the top side at an angle. Haven't got around to dissassemble yet but can someone tell me about them. Also wondering what this thermal coil doodad thing is on the exhaust manifold. Doesn't look like it attaches to anything that it would control. |
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#2 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,628
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Re: What are these....
The 'bolts' are actually plugs. Plugging the holes for the air pump injection tubes.
Just a guess but I think the cover covers the coil for the heat riser. |
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#3 |
Registered User
![]() Join Date: Nov 2010
Location: Hollister Mo
Posts: 137
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Re: What are these....
Can someone elaborate on the air injection tubes......does it have to do with emissions, would that make it a later model head? I havent gotten around to looking up any casting numbers yet. Thanks for the info so far.
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#4 |
Six in a row makes it go...
![]() Join Date: Mar 2009
Location: Vacationland: Maine
Posts: 1,346
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Re: What are these....
I bought a low-mile '68 Biscayne with a 250 that had air injection. Yes - it was an early emission thing. There was a belt-driven air-pump and metal tubes that went into those ports in the head.
I sold the pump to a Corvette restorer for a decent buck and plugged the holes with pipe plugs.
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67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
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#5 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,956
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Re: What are these....
Everything looks original except the cats paw, definitely not an original part for that exhaust manifold.
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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#6 |
Registered User
Join Date: May 2016
Location: Fort Mohave, AZ
Posts: 367
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Re: What are these....
Could the "thermal coil doodad thing" be the thermal coil for the choke on the carb?
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1970 GMC 2500 700R Trans RideTech 4 link rear suspension - Air Bagged on all four corners 350 SBC 300hp Weiand Supercharger FiTech EFI |
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#7 |
Registered User
![]() Join Date: Nov 2010
Location: Hollister Mo
Posts: 137
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Re: What are these....
That's too funny...very observant. I didn't even notice the paw. That's my rodent control for the shop, her name is shop tat. She's fearless, she will literally sit in my lap while I weld and grind or whatever.
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#8 |
Registered User
![]() Join Date: Nov 2010
Location: Hollister Mo
Posts: 137
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Re: What are these....
I don't see how anything could be controlled by the coil thing....nothing attaches to it.
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#9 | |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: What are these....
Quote:
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