Hey guys, I'm busy trying to hunt down a 400 engine for my '68 to replace the Chev 350 that one of the previous owners had installed (for reasons unknown to me).

There is a guy somewhat local to me who has a complete 400 from a '75 Grand Prix:
http://calgary.kijiji.ca/c-cars-vehicles-parts-accessories-Pontiac-6-6L-400-engine-W0QQAdIdZ85318810

How much difference is there between this engine and a late 60s vintage 400 other than the heads and bolt on accesories? Just curious more than anything. I am looking to rebuild fairly stock, certainly nothing over 400hp.

Of course if anyone on here has a nice 400 for sale I'm all ears! :-)

Cheers,

The thickness of the web casting is thicker on the earlier blocks. Any 50557(will have to check this number) casting is the thinner webbed casting. There may be others. I have seen this personally and can confirm. I have also read that there may be a difference in the iron alloy used. This I cannot confirm. That being said, you'd be fine with the later block on a standard hp rebuild. Butler advised that anything under 600hp is OK.

The only other thing that I can think of (newbie) is the newer block will have all of the engine mount holes for all of the different options that have been evaiable through out the years. The older blocks only have two holes.

That 75 motor will be at 180-200 HP. If you plan on rebuilding that motor and making it look good, I may suggest another.

Unless this motor is a temporary until you find a period correct engine.

if your still looking try this guy

http://chicago.craigslist.org/nwc/pts/916721009.html

Thanks guys...I would definately much rather find a period correct engine here, its just that pickings seem slim in my area! Maybe I will hold out a bit longer especially at this price.

Thanks nofun for the link, I'll call and see what he has available and what the shipping is like. Unfortunately the Canadian dollar has shifted and I'm now paying 20% more for a US dollar so I have to take that into consideration too!

Would this be any better?

http://cgi.ebay.com/ebaymotors/Pontiac-F...5fCarsQ5fTrucks

If you want, I can get something together for you, period correct.

Or find something within a few hundred miles, that suits you, and I will crate, take to Canada (Windsor) and ship whatever freight company you want.

I worked at a machine shop for years and still do from time to time. All I deal with is Pontiacs and know what to look for, what heads you may need, and whatever else.

I can even disassemble, bake and magnaflux all the parts so you know what you are getting is sound and not wasting your money.

And once you get your parts up here, give me a call! My most recent Pontiac customer seems to be happy with his engine!

Since you were looking at a WT manual trans engine...

http://cgi.ebay.com/ebaymotors/1968-PONT...sspagenameZWDVW

Is a 68 Firebird manual trans. If you are looking for a 68 Firebird auto, YT code with #16 heads.

Thanks for all the comments - Banshee I'll send you a PM!