Oldsragger

hello, i will change my 307ci engine with a 400ci (407) olds engine , i just wounder if i can use the same engine mounts from 307? well i can buy new anyway, but will it fit on the same engine mounts or must i buy enginemounts for the 400? i will use headers in the car too, that is from the 400 engine, will it fit in the engineroom? or maybe modifyed them a little to fit? i know i must modify the gearbox bracket cause i want dual exhaust... im asking now cause it`s not before the late summer i will begin on the project,,so i don`t know so much yet what parts i need or not... the car is a 1979 delta 88 btw.

thanks

Octania

400 engine [rare] or 403 engine [much more common]?

What is the "400" engine casting number, above the timing housing?
403's are ######-4B or possibly -4A [more rare, but possible]
400's are ######-E or #######-G casting ID

If you use a 403 [small block], then everything is a direct swap.

I'm sure Joe P will be glad to go over the difference between "big block" and "small block" motor mounts again...



[use the motor mounts for your car as it came originally, to match the original frame pads- The motor mounts do not car what engine is attached to them; they DO car what frame pads they must mate with!]

TripDeuces

Looks like he owns a 79 Delta 88 if that matters

Oldsragger

Hello, it was a 400ci orginal but now it is 407ci cause the engine is rebuild.. the engine is with my friend so i can see if i find the nr. on the engine if it will help

Octania

Hello, it was a 400ci orginal but now it is 407ci cause the engine is rebuild.. the engine is with my friend so i can see if i find the nr. on the engine if it will help
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That's pretty important info, so you should get that.
It might even be a 400 by some other maker.

J-(Chicago)

JUST USE THE 307 mounts. NOT the 400 mounts. You must use the pair that is in the car now.

Octania

Unless it's a Ch**y 400....
Or a Pontch'ak 400

all we know at this point is that it's a bored out 400 of some sort... or a 403.

Need exact casting ID to be sure.

Oldsragger

hello again, the owner,(my friend) have this engine, he said it is an olds 400 engine,and bored up to 407, i have not got the engine number yet, i will visit him some day and watch the engine closer and note down the engine number anyway

no it is not a ch**y not pontiac either,, it was to big for his own pontiac car anyway :P

joe_padavano

The 307 wasn't factory installed in a 79 D88. The frame mounts are the same on all 1977-1990 RWD B/C body cars, so use Anchor 2328 motor mounts on ANY 1964-1990 Olds motor in this body.

Oldsragger

thanks for good info, i don`t remember where the 307olds came from..cause my car was a orginal diesel car before long time ago, and the car have sbc 350 before inside too, and now 307ci.. ok, i will try to search for the
Anchor 2328 where to buy when i got the engine,i see i can get them on ebay.

joe_padavano

RockAuto has about the lowest prices on the Anchor motor mounts.

It sounds like you've been the one swapping the motors in this car, so you are probably aware of the frame mount differences, but just for completeness, the diesel cars have the driver's side frame mount further forward than do the gas engine cars. This was done to clear the larger diesel starter. To accommodate this, diesel motors use an adapter bracket between the block and the rubber motor mount on the driver's side to line the motor mount up with the relocated frame mount. Gas engine cars located both frame mounts in line on the crossmember and thus don't require this adapter bracket.

Oldsragger

Ok, thanks for the tips, well i just know the engine story of this car from the last owner, so i have not change or explore engine swap self

another question, do the delta 88 1979model come with 400cid engines orginal too? or 455? or only 350 diesel engines in this type of cars?

joe_padavano

In 1979 the D88 was optionally available with a 350 Olds diesel, a 350 Olds gasoline engine, a 260 Olds gasoline V8, a 231 Buick V6, and a 301 Pontiac V8. There was an Olds 403 but it was only factory available in the Custom Cruiser and Ninety Eight that year. Note that the 403 is a small block Olds, the 400 is a big block Olds, which is why we have asked that question above.

Be sure you know what frame mounts are in the car before you buy the motor mounts. They should look like this:

Oldsragger

aha i see, thanks, so how can it be that a 403 was a "smallblock" and the 400 was a "bigblock" ? maybe more power in the 400 ?

ok, i will look after that parts my my frame

joe_padavano

The same way Chevy has a 396 big block and a 400 small block. The "big block" and "small block" designations refer to the physical size of the block casting, NOT the displacement. In the case of Olds motors, the big block/small block designation refers to the deck height, since the basic architecture is the same for both motors. The small block Olds has a 9.33" deck height, the big block Olds has a 10.625" deck height. The 403 is a short deck small block, the 400 is a tall deck big block, so again, we've asked which you have because it can matter for things like accessory bracket fitment.

Oldsragger

aha, then i understand

M-14

Look at the widths of the intakes, a good indication of big block (wider) or small block (narrow).

lemoldsnut

Another thing along with all you have now learned is; if it is a G block 400 it takes a different flywheel/flex plate than a E block 400, The G block is the same as the small block 403.

Oldsragger

Hello , i have visit the engine today, but i forgot to take pic of the engine number.. :S and bronzegold color.

It is a G block, and i think the beginning on the engine number is something like this:

93816 or something... maybe 39168, maybe 39816 ...

hp 381,7 toque 597,1 on the papers rebuild for about : 9415.224 USD
think that will be ok enougt for my ride..

dancutlass

Hey, it seems like it's a G-Block 400 out of a 68-69 442...
I bet you're going to have the only 79 delta with this engine in it

joe_padavano

The G-block casting number is 396026

Octania

"hp 381,7 toque 597,1 on the papers rebuild for about : 9415.224 USD"
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Good HP, very nice T- almost 600- I assume this is ft-lbs.

Is that US dollars nine thousand four hundred plus for a rebuild?
Holey moley.

joe_padavano

"Holey moley"? For an obviously non-stock build? Priced custom machine and engine assembly work lately, Chris?

Oldsragger

Oh,yeah maybe the number is that, thanks

the old owner of this engine rebuild it and tuned it and get those results from the engine, spent about 9415.224 US but in Norwegian krones.. about 54 thousands or something with all parts and all work include.. maybe a little expencive..i dont know but i buy it for cheaper, so thats nice. 597,1 ft-lbs i think yes.
the engine is overbored 0.30