1970 350 engine
#1
1970 350 engine
I recently purchased a 1953 Chevy pickup with a 1970 350 engine with a matching numbers th400 trans. Block casting #385558 2, engine pad #30M372264 , trans 30M372264 and casting #8 on head (don't think the heads are original. What model oldsmobile had that combo ? Check the photos
Last edited by blee49; April 19th, 2015 at 03:18 PM.
#2
Welcome. I must say I have never heard of a 400 turbo behind a 350.
There are the numbers though, cool. Maybe a motor home? I have never
seen that type of cap for the oil fill either. Others will chime in.
There are the numbers though, cool. Maybe a motor home? I have never
seen that type of cap for the oil fill either. Others will chime in.
#3
Chances are it is a 73-76 Olds 350. If it was originally mated to the TH400, probably from a big car. That block casting # was used through 76. Good motor but is factory low compression with a tiny cam.
#4
That's likely not a TH400, but a TH375. Basically it's a light-duty version of the TH400, used behind the small block in heavy cars. The output shaft is the smaller diameter shaft used on the TH350, for example. Probably a long-tail trans. This combo could have come from a Delta 88 or Vista Cruiser. By the way, the VIN derivative proves that the block is from a 1970, not a 73-76 car. If the heads are original, they would be #6 castings.
#5
The '69 350 I picked up a few months ago that came out of a Delta 88 has #8 heads, and I'm 98% sure they're original. It was also matched to a long tail trans.
https://i.imgur.com/gxZDctz.jpg
https://i.imgur.com/gxZDctz.jpg
#6
The '69 350 I picked up a few months ago that came out of a Delta 88 has #8 heads, and I'm 98% sure they're original. It was also matched to a long tail trans.
https://i.imgur.com/gxZDctz.jpg
https://i.imgur.com/gxZDctz.jpg
#8
Olds used the TH375 in heavy cars behind the 350 motor as far back as 1968. If it's a TH375, that will be cast into the tailhousing. Olds also used the TH400 in some of these applications. In any case, your engine and trans is from a heavy car, either a VC or a D88.
#10
TH400 & TH375 have the same pan shape and body, but different tail housings, and a few different internals.
The "TH375" will be cast into the tail housing (left side, if I recall).
More obviously (perhaps), the output shaft diameter (and yoke size) will be those of a TH350, and not those of a TH400 - if you've seen a bunch of both, the difference will be glaring.
- Eric
The "TH375" will be cast into the tail housing (left side, if I recall).
More obviously (perhaps), the output shaft diameter (and yoke size) will be those of a TH350, and not those of a TH400 - if you've seen a bunch of both, the difference will be glaring.
- Eric
#11
I missed he had the actual year code. Strange someone swapped on #8 heads, unless they were trying to lower compression? Who knows what pistons or cam are in that motor. How does it perform?
#12
I have not driven it very much being I only bought it 2 weeks ago. the guy I bought it from said it needed a tune up. then I test drove it and I did not get on it. I have never owned an Oldsmobile before so I did not know what to expect from a 350 engine particularly being transplanted in a 1953 Chevy pickup truck only God knows. I'm planning on doing a full tune up, convert the points with pertonix ignitor, new cap and rotor, wires, sparks plugs, and change oil, trans filter, and rear end lube. hopefully it will run better.
#13
Just so we're all clear (because even I'm getting confused by this thread), there are actually TWO different engines being discussed.
The first engine, belonging to O.P. blee49, is a 1970 Olds short block (per the VIN derivative stamp) and numbers matching TH400 (or TH375) long tail currently installed in a 1953 Chevy pickup. This engine has non-original #8 heads.
The second engine belongs to poster pherbicide and was pulled from a 1969 Delta 88, with the trans. This engine also has #8 heads but we do not yet know the year of the block from the VIN derivative.
I hate to say this, but here's a perfect example of why you are better off starting your own thread instead of hijacking someone else's thread.
The first engine, belonging to O.P. blee49, is a 1970 Olds short block (per the VIN derivative stamp) and numbers matching TH400 (or TH375) long tail currently installed in a 1953 Chevy pickup. This engine has non-original #8 heads.
The second engine belongs to poster pherbicide and was pulled from a 1969 Delta 88, with the trans. This engine also has #8 heads but we do not yet know the year of the block from the VIN derivative.
I hate to say this, but here's a perfect example of why you are better off starting your own thread instead of hijacking someone else's thread.
#15
The '69 350 I picked up a few months ago that came out of a Delta 88 has #8 heads, and I'm 98% sure they're original. It was also matched to a long tail trans.
https://i.imgur.com/gxZDctz.jpg
https://i.imgur.com/gxZDctz.jpg
'69 engines came wearing #5 heads; #8 were 73-76 only.
OP: Maybe you misread the heads' "6" as an "8"
try the heads' 6-digit casting number, often around the center lower rocker cover bolt.
6 = 403859
8 = 411929
Last edited by Octania; April 21st, 2015 at 09:42 AM.
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