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Scratch/bashing a 702


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I wasn't going to post this but why not. If you guys are bored by it, please let me know. A while back, I had inquired about the availability of the GMC B-7000.

http://www.modelcarsmag.com/forums/index.php?showtopic=96151&hl=

Turns out it looks like only this one was ever made.


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So I decided to do one using a '64/65 pickup cab and the hood of a Ford N600 as a starting point. But that is still in the future. Meanwhile, I am playing at restoring a 31 Cadillac. As I was taking it apart I noticed that the V16 crankcase could make a decent base for the 702 that will be required in the B-7000, which looks like this:


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Although I doubt it was ever this nice in a truck. I had gathered quite a bit of info on the 702 and used this photo of the V6 (Same block end profile) to make a pattern.

702%20Blk%20Frt.jpg

I reduced it to scale and put the V16 crankcase against it. A bit narrower, almost exactly the correct length and lower decks. So I widened it, added height to the decks, used a channel with one flange removed as filler and it fits that pattern almost exactly.


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Edited by landman
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Made a front plate with sheet styrene and "heads" with rectangular strip. The closest thing I have to those valve covers are from a 409. Otherwise, they'd have to

be scratchbuilt.


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The drawing shows a ridge (bolt boss) at each bore. So I marked up the bore centers and added the bosses using half-rounds strips.


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Edited by landman
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I recently got a pile of old engines and parts. Started looking for a suitable intake manifold.


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Nothing I have would work so I tried shaping one out of plastruct.


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I'm trying another approach. I reduced the picture to scale and will cut the shape out of sheet styrene then add & remove to hopefully obtain a shape.


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Edited by landman
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More attempts at an intake manifold. After wrecking a perfectly good dual quad 409 Manifold, I tried to cut the outline of the image glued to sheet styrene.(that is the one on the right). Then I took another approach to building one bit by bit. (That is the one on the left). I think with some refinement, this approach may work.


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Edited by landman
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What in the world could possibly be boring about this???? This is an awesome start to a potentially great project.....I don't know enough about this one to help in any way, but it sure does look like you've got a pretty good handle on it, already....Awesome job....

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JT, here's a bit more info. The 702 was the biggest gas engine available at the time in GMC trucks.


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There is a company which specializes in restoring them to suit various applications. They are the ones who kindly gave me the measurements.Here's their website. there is quite a bit of info about the 702 there.

http://www.thunderv12.com/


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The B-7000 I am hoping to replicate, was a float tractor used by the company I worked for. It had a deck and a winch sort of like this one. I can't remember whether it had gin poles but I think it did. I've been trying to find photos of it but most of the guys who drove them have kicked the bucket and I don't know their family.


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Edited by landman
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The intake manifolds are almost there.


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Started on the exhaust manifolds. Glued some Plastruct together. Rounded the ends one way, then the other.


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Started a strip of half round to make the ridge.


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Looks like the real thing....


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Until you put it on the engine. It's way too big. Look at the picture at the beginning, you'll see what I mean.Have to start again with smaller material. Chalk this one up to experience.


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Edited by landman
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Made another one with smaller stock. It still looks "chunky" compared to the real thing. I've been using 1/8 square rod, perhaps 3/32 maight be more like it.


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The other three are well on the way.


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Edited by landman
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