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It should read I 20 6. The foundry left the 6 off the metal tab screwed to the wooden pattern used to form the sand mold. 3904391 heads were cast only during the 1967 model year. None were cast in 1970.
that's about what i was thinking also. thank you for your input Patrick, i will be going to look at the boat again tomorrow and maybe coming home with it hopefully. Ed
can you explain yourself on 9.8 block passenger car? whats the difference my 67 vette has a 3904351 block also.
Thanks, Ed
Eddie------
There were two different deck heights for big blocks. The 9.8" was used for most applications including all passenger cars and light trucks. I believe it was also the most popular for most marine applications, especially inboard powerboats. The other deck height block was 10.2". It was used mostly for HD truck and industrial engine applications. Some may have been used for marine but I expect this would have been limited to HD commercial applications (e.g. large fishing boats, etc.). 9.8" and 10.2" never share casting numbers.
yes this is referred to as tall deck. this is a 351 block so the 10.2 does not apply i see it would have a different casting and that would be a complete different motor. thanks again, Ed
Originally posted by Joe Lucia (12484)
Eddie------
There were two different deck heights for big blocks. The 9.8" was used for most applications including all passenger cars and light trucks. I believe it was also the most popular for most marine applications, especially inboard powerboats. The other deck height block was 10.2". It was used mostly for HD truck and industrial engine applications. Some may have been used for marine but I expect this would have been limited to HD commercial applications (e.g. large fishing boats, etc.). 9.8" and 10.2" never share casting numbers.
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