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Big Block cylinder head casting question
#2816763
09/03/20 05:51 PM
09/03/20 05:51 PM
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Joined: Jan 2003
Posts: 133 Winter Park, Florida
classracer
OP
member
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OP
member
Joined: Jan 2003
Posts: 133
Winter Park, Florida
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On the block side of the cylinder heads, under two of the intake ports: there is on some heads a "F" or an "R" or other capital letters cast in. Some times there is no letter. Does any one have and idea what these letters stand for. Maybe a foundry? Just a curiosity type question. Thanks Jim
70 Challenger A/SA 2441
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Re: Big Block cylinder head casting question
[Re: A727Tflite]
#2816980
09/04/20 12:00 PM
09/04/20 12:00 PM
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Joined: Jan 2003
Posts: 14,493 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
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The 906 lore is that the “F” heads are the best.
My findings have been that not all F heads are anything special........ however the best untouched 906 I’ve tested was indeed an F head.
What’s odd is it’s not like there are A, B, C, D heads.........I seem to recall C, F, M, R, and no letter for 906’s.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Big Block cylinder head casting question
[Re: R/T1968R/T]
#2818352
09/07/20 09:29 PM
09/07/20 09:29 PM
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Joined: Jan 2003
Posts: 133 Winter Park, Florida
classracer
OP
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OP
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Joined: Jan 2003
Posts: 133
Winter Park, Florida
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Thanks everyone for the reply's. I've heard the old "F" casting lore. The last set ("M" casting 906's) I used on the car finally broke. They cracked under the center two exhaust ports. I have a good collection of head castings on the shelf. I'm going to use a set of "F" casting 906's. This is the nicest set I have, both heads cast with in 4 days of each other in Sept 1967. They both have no noticeable core shift and originally factory valve job with no valve recession. I have seen all the different markings on these heads, I was hoping someone who was around back then at the factory had some insight. Thanks again......Jim
70 Challenger A/SA 2441
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