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#1 |
Registered User
Join Date: Aug 2003
Location: MN
Posts: 380
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Does anybody know if...
A 1972 350 block has the same outside dimensions as a 1984 305 block? Also, will the 350 bolt up to my '84 700r4 tranny? I am looking to put my freshly rebuilt engine from my '72 into my '84 Caprice. I need to know if the block is the same and if it will just drop right in and have the motor mounts hook up right. So basically, are the '72 350 and '84 305 identical except for bore and stroke? Thanks...
-Scott
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1972 C10 1972 C20 ![]() |
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#2 | |
Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,285
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yup they are, the only real different small block is the 400 and it'll still bolt right in place
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ASE Master Certified-GM Trained-Mechanic 1968 Chevy C30 157" WB Wrecker 1969 Chevy CST/10 SWB 1971 Chevy Custom/10 (first truck) 350, NV3500 5 speed 1971 Chevy K20 Custom Camper 4x4 350 TBI, SM465/NP205 1974 Chevy Custom Deluxe/10 1979 Chevy Custom Deluxe K10 farm truck beater 1989 Chevy K2500 Quote:
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#3 |
Registered User
Join Date: Aug 2003
Location: MN
Posts: 380
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When did they change the design of the block?
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1972 C10 1972 C20 ![]() |
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#4 |
Senior Member
Join Date: Nov 2003
Location: Brookings, SD
Posts: 10,497
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I second what Blue_71 said.
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Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs. |
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#5 | |
Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,285
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i think 88 but im *almost* sure they will still bolt in, maybe have to change motor mounts though
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ASE Master Certified-GM Trained-Mechanic 1968 Chevy C30 157" WB Wrecker 1969 Chevy CST/10 SWB 1971 Chevy Custom/10 (first truck) 350, NV3500 5 speed 1971 Chevy K20 Custom Camper 4x4 350 TBI, SM465/NP205 1974 Chevy Custom Deluxe/10 1979 Chevy Custom Deluxe K10 farm truck beater 1989 Chevy K2500 Quote:
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#6 |
Registered User
Join Date: Jul 2003
Location: north of Phx AZ about 30 miles
Posts: 698
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Well they did and they did'nt change the block design. Mostly they changed the intake system and the head design. Still fairly interchangeable though. I think they had one design from the '60s through about '84, one from '85 to the mid '90s, and one or two since then.
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Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold |
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#7 |
Registered User
Join Date: Aug 2003
Location: MN
Posts: 380
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Well, the reason I am asking is because when I ordered my rebuild kit it said "Chevy 350 69-80" so I am wondering is that just internal differences?
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1972 C10 1972 C20 ![]() |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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not so much internal, but small differences here and there, like one piece rear main verses 2 piece, the aformentioned intake differences, ect.
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#9 |
now thats a true COON DOG
![]() Join Date: Nov 2000
Location: Franconia, NH
Posts: 1,977
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ya your good to go bolt em together, and have some fun! as far as I know the bell housing design is the same on all sbc.
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current project 67 ![]() 71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) ![]() 72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!) 68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!) 67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!) |
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#10 |
Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Motor mount bosses are in the same place. Dipstick may be on the other side.
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#11 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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It's a straight in swap except for the left side dipstick is going to foul your left side exhaust manifold. You'll have to modify your dipstick tube or run a flexible one like a Lokar.
A second issue is the heads. Your 305 has what is called "seventh bolt hole heads". If you'll look closely at your 305 heads, the very front bolt on the left side and very rear on the right side exhaust manifold bolt hole is offset. The earlier 350 has the normal arrangement with just 6 bolts per manifold. Look closely at the left hand head in the picture below. See where the exhaust manifold bolts on? The very top is two holes right next to each other. Your 350 heads won't have that second bolt hole there, so your 305 exhaust manifolds won't be able to bolt on. It's a wierd anamoly of the 80s era engines. ![]() I've done it before and just used good Fel-Pro gasket and left the one bolt out of each side manifold. It doesn't leak if you have good true manifolds and keep the other 5 bolts tight.
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#12 |
Registered User
Join Date: Jan 2004
Location: NH
Posts: 2,266
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The difference in the 69 - 80 years was the dipstick being on the drivers side, they changed to the passenger side after 80 other than that most small blocks from 56 to almost current are fundamentally the same size and will bolt up to just about all chevy transmissions. The only reall issue would be the old 235 inline 6, it will not bolt up to any later model trans because of the way the bellhousing bolted up to the block. JMO
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#13 |
It's a catastrophic success.
![]() Join Date: Jan 2003
Location: Oklahoma
Posts: 2,077
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What year was it that they changed the crank end and flywheels?
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