Does anyone know if the lower warm air guides(parts 11 and 12 in the diagram) are crucial for either engine ccoling or cabin heating? Mine are missing and my car runs a little hot, so I didn't know if having these would make a difference.

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They put them there for a reason. Not sure if it's for proper cooling or to protect the push rod tubes but I drove my car for two years before I realized they were missing. After installation I didn't see any noticeable changes in temp.

If you need them, I have them in stock... I just need to know if you have a tail or side shifter.

(Parts Whore trying to sell some of the accumulated parts....)

They are important .

I have a side shift drivers side and one I made out of aluminum for the passenger side.

Can't use them with my headers. 20.00 shipped.

Don't forget that the 75-76 ones are different yet...

--DD

besides protecting the pushrod tubes, they also help secur the heat xchangrs to the case. i would put them on.

k