1967 3904391 Cylinder head

[Joe L.]

Re: 1967 3904391 Cylinder head

Thanks Joe. For clarification, can you tell from my photo whether the spring is a GM #3859911 or GM #3970627. I'm pretty sure all springs have purple dye stripe on both sides and not a red stripe. I'll check the photos again later. Thanks again.

Hector------


Do as Duke says. If possible, get a clear, close-up photo of one of the springs so we can see if the inner coil is a damper (flat) or a spring (round).

[Hector G.]

Re: 1967 3904391 Cylinder head

Thanks everyone. Wonderful information. I looked at the springs again and have concluded that the valve springs in both heads are, IMHO, low mileage GM 3970627 springs. All springs have the purple dye on two sides of each spring and the inner coil is a spring (round). Lucky me. Thanks again. Hope to see you guys at the Denver National Convention.


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Hector

[Joe L.]

Re: 1967 3904391 Cylinder head

Thanks everyone. Wonderful information. I looked at the springs again and have concluded that the valve springs in both heads are, IMHO, low mileage GM 3970627 springs. All springs have the purple dye on two sides of each spring and the inner coil is a spring (round). Lucky me. Thanks again. Hope to see you guys at the Denver National Convention.


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Hector

Hector------


This means that the valve springs have been replaced on this engine and are absolutely not original to the engine. The GM #3970627 did not even exist in 1967. The question is, are you sure they were ALL replaced?

[Hector G.]

Re: 1967 3904391 Cylinder head

Joe,

Yes. Understood. I consider that a good thing that they are not original to the engine based on your earlier statement that the original 3859911 "spring is VERY problematic and often breaks, sometimes with disastrous results. I would NEVER have these springs on big block of mine. Never. Ever." And yes, to your latter query. As I noted earlier, "All springs have the purple dye on two sides of each spring and the inner coil is a spring (round). I also noted that they have a yellow end (closed coils) going toward the head.

Thanks for your help.