[caddor38]

Originally Posted by FASTASSBIRD

The problem I have is that people are fighting over this block being the holy grail, an “HO” motor

There is no fight. It isn’t the “holy grail” of HO motors. That belongs to the WC hands down. Don’t believe me just try and buy one. Expect to spend 4K and up I would guess.

My gut reaction to the whole thing is that it was an extra they had sitting there so they stamped it YC and moved it out. I’d like to see the part number on the front main cap that will say a lot but I can already see something else on the pics that does lead me to think it was a legit original 4 bolt main block. Not uncommon for them to need a block and use the first thing that they could grab. Being a vin in the 4k’s (basing this on previous mentioned big cars starting at 300k.) would mean it was very early in the 71 year.

Thanks for the reply, here is a picture of the main cap. I am assuming this is original 4 bolt main caps since this was a standard bore. It appears to be GM5 A77?

[FASTASSBIRD]

Originally Posted by caddor38

Thanks for the reply, here is a picture of the main cap. I am assuming this is original 4 bolt main caps since this was a standard bore. It appears to be GM5 A77?

That’s the rear it looks like. I want to see the front cap looking down at the face of the block. Plus their should be a full part number on the cap. I’d have to go look at mine to see what the part number is but legit original 4 bolt blocks used a specific front main cap. In the end all that will tell you is it has the correct caps. Not a definitive answer to it being an original 4 bolt from the factory but certainly helpful info in the argument. Most guys who swap the caps just swap the center caps cause they don’t know better.

[caddor38]

Originally Posted by FASTASSBIRD

That’s the rear it looks like. I want to see the front cap looking down at the face of the block. Plus their should be a full part number on the cap. I’d have to go look at mine to see what the part number is but legit original 4 bolt blocks used a specific front main cap. In the end all that will tell you is it has the correct caps. Not a definitive answer to it being an original 4 bolt from the factory but certainly helpful info in the argument. Most guys who swap the caps just swap the center caps cause they don’t know better.

Here is the number on the cap