decoding engine stamp

brokeassbuilder · Veteran Member

decoding engine stamp

Ghost Post · Poncho Master!

Can you confirm your posted #'s are what's stamped on the extended block deck surface in front of the passenger's side head?.
Also please note the casting #'s from the top bellhousing area rear of the block too..

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brokeassbuilder · Veteran Member

hmm ya its kinda of hard to do the motors still in the car but i'll see if i can get a read of it the number posted was if you were looking at the frontof the engine left side above the timing section

brokeassbuilder · Veteran Member

does this sound right ? found number #500667 right side near transny dip stick on the block

68sd · Canadian Poncho Superstar!

some later big blocks also may have a stamping on the top of the timing cover

-- Edited by 68sd on Monday 29th of November 2010 12:39:04 PM

brokeassbuilder · Veteran Member

looks like it 500557 now does thatmean through my looking into gm codes this is a f body 76 400 185 turbo 350 l-78 z somethin still not jiving

Beaumont4008 · Uber Guru

So you have and American Pontiac block ? What car do you have it in ? Thought you were talking about a big block chevy (canadian Pontiac) engine.

Ghost Post · Poncho Master!

I thought you were into a BBC too!.

If a Pontiac block your decode looks correct..
Casting 500557 w/ Y9 stamping = '76 400 2 Bolt Main L78 4-Bbl 185Hp w/ Turbo 350 in an F'Body

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Beaumont4008 · Uber Guru

Thats the stuff Ghost Post. Just so happens I have the same block in my garage just a different suffix code . Mine was in a 76 Firebird . Sitting in the garage for years.

brokeassbuilder · Veteran Member

the block were discussing is in my 67 firebird 400 i guess someone tried to do a clone? the block has two barrel carb on it is this block even worth redoing or should i yank it and put something a little more powerful in?it is a pontiac block from oshawa

-- Edited by brokeassbuilder on Tuesday 30th of November 2010 12:38:45 AM

-- Edited by brokeassbuilder on Tuesday 30th of November 2010 12:40:28 AM

Beaumont4008 · Uber Guru

You could always change the intake and carb, upgrade the cam. Check and see what kind of heads you have. Probably 6X heads if stock to that engine. The head code will be on the centre exhaust port. On Pontiac engines the compression varied from year to year with the heads only. The pistons were the same flat tops but the combustion chamber got bigger and bigger as the years went on to lower the compression. If stock 76 6X heads your compression will only be about 7.6 to one. There are a good flowing head but have a large combustion chamber (101 cc). Your 67 would have had a head with a 72 cc chamber.

brokeassbuilder · Veteran Member

ok thanks for all yerinput guys :)