Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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1967GTO_AL, Welcome to the forum.
The 9792710 blocks are known in enthusiast circles as the first factory 4 bolt main capped 400 blocks, only cast on a few dates and used in late '67 RA GTO's and late '67 RA Firebirds. The 997 casting heads, there seems to be two different externally marked styles, again only used on the '67 RA engines. Very rare, have only ran across two sets of 997's, in person, and have many rare Ram Air engines and components through my hands over the last 30 years.
Pete McCarthy wrote the book "Pontiac Performance 1955-1979" , it was first published around '88. Pete raced a '67 RA GTO (car has been for sale, as of late) for quite a few years, and there is info in the book about the car, as well as many pictures of many rare block and cylinder head castings. Plus page after page of engine code ID charts. There are a few exclusions and mistakes, like the exclusion of the "2510" block, but it is a very strong compilation of important Pontiac "numbers". Many folks today, copy and paste, Pete's published material throw it on the Internet in an odd fashion, dont credit him, then one sees a hastily pasted version of it pasted like above....fairly disgusting.
More on '67 400 blocks, info has come to light, that there are actually 3 different casting number 400 blocks used during the course of '67 400 production. The first was used very early, and has its seven digit casting number back by the distributor area, just like previous 389's. The next and most common, has 9786133 cast on the flanged area coming up from oil filter housing mtg pad. The last, the extemely late usage RA application 9792510 blocks have their casting number on the same area coming up from the oil filter mtg area, and of course this latter RA 400 block has factory fitted 4 bolt main caps. Factory stamping partial VIN on the face of the block didn't resume till during the '68 model year, so your '67 RA 400, will not have a partial VIN to obtain PHS info of the original GTO it came out of. Still, if it's an original late '67 usage XS shortblock and 997 heads, and in decent rebuildable condition, it is quite valuable to a restorer faithfully restoring a '67 RA 4spd GTO. Love to hear more about it, how you came upon it.
Last edited by Pinion head; 03-18-2016 at 10:27 AM.