[pontorquer]

Rocky, would this mean these SR 455 4 bolt main are 455 HO service replacement blocks ?

[Rocky Rotella]

Originally Posted by pontorquer

Rocky, would this mean these SR 455 4 bolt main are 455 HO service replacement blocks ?

Technically, yes, but because the '71-72 455 H.O. shared the same short block with the standard 71-74 455, there really isn't anything unique about the 71-72 455 H.O. beyond its four-bolt main caps. Basically, if you were warrantied (or purchased) an SR 455 during the early '70s, the SR fitted assembly you received was equipped with four-bolt main caps regardless of whether the original application was a 455 H.O. or low-rpm 455 two-barrel. And that would apply to other sized SR blocks produced during certain years like the 389, 421, and 428.

[NotaT/A]

Not sure if these pictures help you or not Rocky, but here is what I have on a 69 RAIV SR block.

[Rocky Rotella]

Thanks! Do you happen to know the date code on the block?

[NotaT/A]

Sorry that I left out the date code.
It is B212.

[Rocky Rotella]

Thanks!

[bankbook]

Rocky,
Here is my entry.
73 455 SR Short block.
The numbers on the front of the block are :
SR 82448

And by the distributor:
K263

[moparcolt]

Rocky

I dont have a picture on my computer, but here are the numbers of my 70 ram air 4 replacement block.

stamp on the back of the block is 9799915 original casting number is ground off and this number is stamped over it.

the SR # is SR87328
it was cast E262, May 26 1972
it had a 9794054 crank, super duty rods and 722 X heads on it

[AG]

I have a 455 SR engine that is dated from 1973 that was bought in the 1980s sometime.

[Rocky Rotella]

Thanks for the info, guys.

If there's anyway you can send photos of the SR number, the casting date, and the casting number/stamping, I'd appreciate it. Also, if the pan is off, I'd like to see the main cap numbers.

[moparcolt]

Here's the stamp and SR#

Sent from my SM-G973U using Tapatalk

[Rocky Rotella]

Thank you, moparcolt!

[moparcolt]

Rocky, I sent you a PM about another one

Sent from my SM-G973U using Tapatalk

[Rocky Rotella]

Thank you!

[John Eiseman]

This one 70 SR 400 block is SR81318 and is a #9799914 cast with an early build. Maybe an H or I of 69 date.code? Will check exact date later for you.

[Rocky Rotella]

Thank you, John. Any pictures you can post or send of the casting number (or stamp), SR number, and cast date would be a help so I can photo-document it in my files.

[G.T.O.boy]

Rocky,

Here are some numbers as I have been trying to do some research for a replacement of my 64 389 76x block which is not repairable

these are from Ebay (still there)
9792506 built A229 SR82002 4bolt block number ground then stamped

9799914 built F071 SR812192 4bolt block number ground then stamped

50081 built B256 SR89716 455 2bolt cast part number

will need to get the numbers off my 64 389 SR Block that I found when I get back from machine shop

[25stevem]

As far as I know there where no 4 bolt 389 blocks in 64 and up thru the last in 66.

[G.T.O.boy]

Yes you are correct, just sharing info with Rocky for his research, these are 400 sr blocks and 1 455

[Gordon Church]

SR 87852 400ci 9790071 hand stamped….casting date ‘71