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Does any one have the physical dimensions of a 409 or a link to a source?
Best Regards, Pat
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It is 1 1/2" longer, 2 1/2" wider and 7/8" lower then a small block. Why?
John
1954 Belair Sport Coupe 1960 2 door Impala Hardtop 348/340HP 4spd 1962 2 door Impala Hardtop 409/409 4spd 1962 2 Door Biscayne Sedan 327/250 Auto 1977 Monza Mirage 305 4 Speed 1988 Celebrity Wagon 2018 GMC Sierra 2500 HD Diesel
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Because I want to build a model of a 702 and the heads and valve covers look like the 348/409 engines. While the 702 is a y block (60 degrees) I thought I would use model 409's as a base. I just wanted to know how they compare.
Best Regards, Pat
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The spark plugs are above the valve covers on the top of the head while the 409 has the spark plugs below the valve covers. The width of the intake manifold is significantly larger on the 409.
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Don, you might want to check that. The intake is surprisingly wider on the small block. I just checked and I got 9 1/2 on a 2x4 409 intake and the 10 1/4" on a Q=Jet small block intake. The deck width on the 409 is 7" and 5 3/4" on the small block. Nothing scientific just with a tape measure and my eye. (I checked the decks on some blocks I got laying around the shop, same with the intakes)
John
1954 Belair Sport Coupe 1960 2 door Impala Hardtop 348/340HP 4spd 1962 2 door Impala Hardtop 409/409 4spd 1962 2 Door Biscayne Sedan 327/250 Auto 1977 Monza Mirage 305 4 Speed 1988 Celebrity Wagon 2018 GMC Sierra 2500 HD Diesel
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The spark plugs are above the valve covers on the top of the head while the 409 has the spark plugs below the valve covers. The width of the intake manifold is significantly larger on the 409. I went back and looked at pictures of the 702 and I had never noticed the spark plugs inside the vee. I guess it'll have to be scratch built.
Best Regards, Pat
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Come to think of it, the valve covers don't look THAT much like those on the 409 either. It was a good idea while it lasted. ![[Linked Image from i1176.photobucket.com]](http://i1176.photobucket.com/albums/x324/landman2/Models/GMCV-12-Copy.jpg)
Best Regards, Pat
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If it wasnt for the fuel that would use and the overall length I would think about putting that in my 38. Tony
1938 1/2 ton Hope to drive it before I retire
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I imagine they aren't the most economical. I've seen a few rods with these on the web while looking for dimensions. that is why I was asking about the 409, I thought I might use them as a base but they are very different.
Best Regards, Pat
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