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1980 engine indenty unknown

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Old May 26, 2015 | 06:44 PM
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Question 1980 engine indenty unknown

hey guys i just bought this 1980 ford a week ago and it has some vacuum lines missing,and want to replace them, so im trying to find out if this is a Windsor or Cleavland, the water neck is attached the the block, and the valve covers have 8 bolts, so i think its a cleavland but the vin number says its a 302ci and its uses 5/8 spark plugs what else can i look at to try and identify this engine?
 
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Old May 26, 2015 | 06:55 PM
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Best way is to look at the casting numbers on the block. With 8 valve cover bolts, it's most likely 351m or a 400.

As for the vacuum lines and such.. the best thing to do on an older engine is to just cap everything off except the distributor's vacuum advance, tranny modulator (if it's a C6) and PCV valve. If you live in a state where testing is required even on older vehicles, it will all have to be fixed properly.
 
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Old May 26, 2015 | 07:28 PM
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thanks man, and a 351m is a cleaveland? and i live in canada and we dont have anykind of emissions test ha, will i have worse fuel mileage with my vaccum lines not hooked up?
 
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Old May 26, 2015 | 07:31 PM
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Originally Posted by Alex Knatchbell
hey guys i just bought this 1980 ford a week ago and it has some vacuum lines missing,and want to replace them, so im trying to find out if this is a Windsor or Cleavland, the water neck is attached the the block, and the valve covers have 8 bolts, so i think its a cleavland but the vin number says its a 302ci and its uses 5/8 spark plugs what else can i look at to try and identify this engine?
Is it a f100 or a f150 or a f250/350? What VIN decoder are you using? 1980 is sort of a oddball year and uses the older VIN system, most of the decoders don't correctly decode a 1980 truck.

8 valve cover bolts means it is a 351m or 400. There is a slight chance a 351c was swapped in. Look where the distributor goes into the engine. Where the dist sits on the engine block, follow the casting top of the engine back to the intake manifold. If the surface where the dist sits is at the same height as the surface where the gasket goes for the front of the intake, it's a cleveland. If you follow this surface back and there is a large step up to where the intake gasket sits, then it's a M engine.
 
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Old May 26, 2015 | 07:44 PM
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so my distributor sits just above the intake, and my vin is f15gpgg4607 and decoders say its a 302
 
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Old May 26, 2015 | 09:39 PM
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Originally Posted by Alex Knatchbell
so my distributor sits just above the intake, and my vin is f15gpgg4607 and decoders say its a 302
Most online decoders are wrong in some aspect; more than most are totally wrong with 1980 and prior VINs.

Below is from the FoMoCo 1980/89 Light Truck Master Parts Catalog....

The fourth digit in your VIN is a G making it a 5.8L/351cid 2-barrell carb which in 1980 was the 351M.








 
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