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Year Engine HP Engine code Trans CR Cam Head Code BBL Carb No. Misc
1965 389 256 HP XB A 7.6 066 75 / 9778775 1-2 7025060/61 A/C Block Casting # 9778789 Should have full head production number under valve cover - 9778775
1966 389 290 HP XB A 7.6 066 091 1-2 7026060/61 A/C Block Casting # 9778789
1967 400 260 HP XB A 7.6 254 142 1-2 7027060 Block Casting # 9786133
1969 350 265 HP XB A 9.2 254 47 1-2 7029062/72 45 degree int. Block Casting # 9790079
1977 350 170 HP XB A 7.6 793 6X 1-4 17057262 Block Casting # 488986
1978 301 140 HP XB A 8.2 471 01 1-2 17058160 Block Casting # 525934

Oh didnt see thank u

You will need the date code next to the dist. To know which one you have

I seen the head number after zooming in on it as 47 so I'm sticking with my guess as a 69 350 , I was looking for one of those for one of my cars a few years back dated the 3rd week of jan,

Where u see the 47?

Center exhaust port.

I didnt see any number by the distributer? But either way its not a pontiac 400?

Go here:

http://www.teufert.net/pontiac/page2.htm

The block casting code will be on the block below the rear of the passenger side head. You need the block casting code and the 2 letter code, in your case XB, to identify the engine properly.

Don't feel too bad, I've been searching for this mystical number for a while as well....

My block is an XS and I was told it was out of a GTO Ram Air.... but I just found a number, below distributor on a horizontal surface and obscured by the transmission dipstick, the partial I can see is x300667 which I havent found in the listings.... other than that there is a "2" a few inches to the left.

It's not mysterious. Find the casting number (not near the distributor except up through early 67 castings) and the two letter code and go to the link I posted above. If you want to continue to be mystified, go right ahead.

Since many years used the same 2 letter code, this is the way to verify the year and type of block.

Ok thanks now I know where exactly tolook loo

Thanks guys for the advice and pic.... the block is painted black, so difficult to read anything without a lot of light.

The date code looks to be D056 or D058. The teufert site lists a block code of 500557 (I thought I was seeing 300667) for late 1976. This site doesn't have an XS for '76, but at www.wallaceracing.com/engine.htm I found an XS engine code for late 1976 (170hp yay!!).

The www.spottsperformance.com/engineid.htm page identifies 500557 as a 400 Service Replacement engine.

So I'm now assuming I have a 76 engine in my 67 bird.

(As a guide to others, the block number is visible on the passenger side through the gap between rear of hood and firewall.... the date code at the back of the block is best seen from the driver's side.... both are on horizontal surfaces.)

So i found out is a 69 350 i guess they switched from 400 to 350 since the vin number says its a 400 car