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#1
03-08-2011, 08:54 PM
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Quick question about 400s
I recently talked to someone who has a '76 400 for sale. He says it will not fit into my '68 GTO because something about the way the mounts are setup (I think). I would assume I would change the motor mounts, but is this really true? I thought the 400s were kept basically the same throughout the years except for small details. Thanks.
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#2
03-08-2011, 09:03 PM
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adapter plates are available
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so many pontiacs, so little time.................. moderator is a glorified word for an unappreciated prick.................. "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." --Albert Einstein "There is no such thing as a good tax." "We contend that for a nation to tax itself into prosperity is like a man standing in a bucket and trying to lift himself up by the handle." - Winston Churchill |
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#3
03-08-2011, 09:19 PM
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 6.0L LS single turbo, 8.85 @155 mph 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.03@171 mph 2009 G8 GT |
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#4
03-08-2011, 09:35 PM
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Quote:
RFE139B ENGINE MOUNT CONVERSION BRACKETS. (Inquire) so I am not sure they have them available. However, Ames lists them: N244A 1976-81 Engine Mount Adapter Kit (RE)..................... $53.00/kit Hope this helps. Erik
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 6.0L LS single turbo, 8.85 @155 mph 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.03@171 mph 2009 G8 GT |
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#5
03-09-2011, 12:23 AM
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Some engines were drilled with multiple mounting holes to allow installation in nearly ANY pontiac that would have a v8. Some engines only had a couple of mount holes drilled/tapped. You can either buy the adapters or you can drill/tap the holes on the bosses that exist on the block.
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'68 GTO 4-spd Hardtop (11) '68 GTO Convertible AT (1) '70 LeMans Sport Land of Lakes Muscle Car Classic Facebook Event Facebook Wall (Kurt Smith,Minneapolis) |
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#6
03-09-2011, 12:33 AM
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Ok I will check into that, thanks. Good to know I can still use this engine somehow. Is it an easy conversion?
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#7
03-09-2011, 12:38 AM
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76 should have the early and late bolt patterns, 5 holes in each side, 77 was the first year to only have the late pattern 3 holes only. To answer your question 68 mounts should bolt to a 76 block, no adapters needed.
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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#8
03-09-2011, 11:40 AM
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Sirrotica is correct.
The problem is going the other way - you need an adaptor to put a 68 engine in a 76 car like a Firebird. 1970 to 76 engines will fit into any Pontiac car except the early front engine mount cars. 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#9
03-14-2011, 09:50 PM
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Ok so I picked up a slightly different 400. The big numbers to the side of the distributor say 550557, which is a late 75-76 engine. However it looks like this 400 only has 3 bolts per side and I don't think any bosses for any other mounts. I could be wrong.
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#10
03-14-2011, 10:42 PM
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Post a picture of the sides of the engine. I have a 77 400 4 barrel out of a Firebird that does't have the mount holes for the earlier 2 bolt mounts.
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Eric 1969 GTO - 461, turbo 400, Continental 13", 3.08 gears. - 12.59 e.t. @ 108.43 mph, 1.898 60' 1978 Oldsmobile Cutlass Supreme- 461, turbo 350, PTC 3500 converter, 9" 3:50 gears. = 11.39 e.t. @ 117.55 mph, 1.599 60' on E85 |
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#11
03-14-2011, 10:45 PM
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It's most likely a 77-78 as these are the only years that had only the late 3 hole motor mount bolt pattern. The year is most likely, but not always, 77-78, next to the distributor in 2 digit form there is also a longer date code cast in if the 2 digit number is absent. The 557 is probably the weakest Pontiac 400 block. Good at least for a strong street engine 450-500HP safely. Good to hear you finally found a usable block locally.
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated
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#12
03-14-2011, 11:15 PM
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The numbers I have are:
Next to the distributor 9101 Front pass. side WA (no numbers above that) Front lower driver's side 27N108574 Hope this helps. The engine has a mild cam and some work done to it. Is there any way to strengthen anything on this block? Last edited by codyyy; 03-14-2011 at 11:33 PM. |
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#13
03-15-2011, 08:08 PM
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I'm guessing I'll need to buy adapter plates. My coworker looked at the engine and said I can get away with reringing the engine again and honing it, however he thinks I got screwed on the price. I paid $700 for the shortblock. It was either this or a running $650 76 GP motor with unknown miles.
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