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Re: Super A cylinder head

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Piedmont J3

12-11-2013 16:47:36

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Thanks Jim, Gene, and RTR. The 6716DB is originally off an old wrecked B that's been here forever. My Super A is s/n 340858, engine s/n FCM 208589, number into the head is 251172R1 with a "L" underneath and a small tag with "77T" to the left of the 251172R1. Engine has water pump, dipstick, and has been in family since new, no known engine replacement. My 251172R1 head is cracked. Combustion head dimensions are identical on both heads except the spark plug boss on 251172R1 head extends 1/4" further into combustion chamber. Water jacket holes, valve lengths identical. My Super A parts book TC-39C Rev. 3 says the 251172R1 head can replace the 6716DB head and that's the only reference I can find to the 6716DB head. I think it will work ok and I'm going to try it. Thanks to all for the advice. Ed

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gene bender

12-11-2013 22:48:37

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 Re: Super A cylinder head in reply to Piedmont J3, 12-11-2013 16:47:36  
Your engine is from a power unit with the dipstick ect. They made a lot of changes in heads size of the hole where sparkplug goes deeper for sparkplugs size of the combustion chamber but the big item is the size dome on your new pistons some have different domes that engine was made from 39 till like 51 when waterpumps ect were added. I like to go with cast codes i have a bunch of heads and putting them side by side you can see the small changes that were made even got some distillate pistons if someone would want.

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