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Old 03-03-2021, 03:28 PM
dlv4540 dlv4540 is offline
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Default 1967 427 4 Bolt Block Stamping

I wanted to see if I can get an opinion of a front block stamping from a 1967 4 bolt 427 block. This block is a 3904351 I believe is dated H-25-6 and the front pad numbers don't make any sense to me but I did not want to get it decked. I just wanted people's opinion in case I am not aware of some different stamping. It is stamped T03067AD DA94I.
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Attachments - The Supercar Registry valve to bore clearance.jpg P3040007.JPG 427 2.jpg 427 .jpg
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  #2  
Old 03-03-2021, 03:48 PM
SuperNovaSS SuperNovaSS is offline
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In my experience, a suffix with a number followed by 2 letters is usually a marine application.


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Old 03-03-2021, 07:38 PM
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7AD: Marine 67 427 390 HP RPO L36
Carburetion: Single 4 Barrel
Rotation: Normal
Description: Daytona
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Old 03-03-2021, 08:54 PM
dlv4540 dlv4540 is offline
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OK this is a four bolt block and has the reliefs cut out at the top of the cylinders which I always thought on the 427 and 454 if they were 2 bolt blocks the reliefs were not cut out?
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Old 03-03-2021, 09:57 PM
Astock Astock is offline
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It could be like the sbc pick-up trucks, low horse 010 block. They still used a 4 bolt main. Marine app maybe received the 4 bolt too, even lower horse, because of the extra strain(?)
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Old 03-03-2021, 10:52 PM
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Agree with above; seems to be the consensus. Built for heavy duty use due to being under continuous load/strain.
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Old 03-04-2021, 01:28 PM
olredalert olredalert is offline
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----I have bought several 67 351 low horse marine motors out of cabin cruisers that were parted out around here. They were all 4-bolt main blocks. Can't remember weather they had oil cooler holes or not.....Bill S
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Old 03-04-2021, 01:34 PM
Rumbleguts396 Rumbleguts396 is online now
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Hi Guys, trying to educate myself here. May I ask what the reliefs cut out at the top of the cylinders Is/are? Thanks Rob
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Old 03-04-2021, 03:43 PM
L78racer L78racer is offline
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They are valve reliefs.
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Last edited by L78racer; 03-04-2021 at 03:47 PM.
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Old 03-04-2021, 06:57 PM
SuperNovaSS SuperNovaSS is offline
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See the relieved area on the forward side of each cylinder on the deck surface?


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