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Username Post: cyl head temp
"8th Year" Gold Supporting Member
Posts 890
11-05-22 06:37 AM - Post#2849645    

I am real close to closing the deal on a '65 corsair.

I have read that cyl head temp should run normally between 400 and 500 degrees. What would cause the temp to go beyond this range? The first thing that comes to mind would be timing. What else would cause this?

Thanks in advance, Pete
1951 styline deluxe sport coupe w/'60 261 engine & 54 powerglide

1965 Corvair Corsa 140 hp 4 speed convertible

Mel Foye
*VIP* Original Founding Member Group
Posts 5597
Mel Foye
11-06-22 07:48 AM - Post#2849705    

Fan not moving enough air.

It Was On Fire When I Laid Down.

"3rd Year" Gold Supporting Member
Posts 320
12-16-22 04:09 PM - Post#2851349    

If I recall, along with the belt driven fan those flat 6's had lower air ducts below the heads/exh manifolds with thermostatic flapper doors at the rear. The flappers were operated with bi-metal coils or springs similar to an old choke coil and opened or closed to let air pass, thereby aiding in warm up and cooling. Be good to know they're operational (assuming they're still in place) as well as muffler shields between mufflers & valve covers

Attachment: vair_ducts.jpg (6.87 KB) 14 Views

'65 Impala SS, Crocus Yellow/blk
327 / 300 L74
M11 3 on the tree
12 bolt 3.31 open dif

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