Thanks to PB these pictures were scrapped. So here they are again and some updates...
Going to try something. R-1 carb steel intake. Don't have shield gas and would rather TIG weld aluminum. But that's in the future. So right now trying it in something I can do... think I can do.
Cut the flange of a '75-'77 L20B intake, the ones that are co-joined to the exhaust and pretty much the most useless intake around. Transferred the shape to steel
Drilled/bored to 1 5/8" so that a 1.5" exhaust pipe will fit. Didn't know if this would work on steel so went slow and squirted lots of water on the part while boring. Took about 45min for each hole using a POS $50 drill press.
Had some 1 1/2" muffler pipe laying around. Fits just right. Still needs the two bolt holes, will do tomorrow.
Probably will set the pipe back 1/8" and weld from the head side so it's air tight, Grind down the lip plus some on the outer carb side for good measure.
My U67 head has 1.375" ports that I gasket matched last spring for Canby trip but will have to be expanded again to 1.5". This will allow for any discrepancy/misalignment in my drilling too.
Still have to figure out the pipe lengths and any bends yet.
When complete, sand down and silver/aluminum paint and it will look fine.
Got a '74 as well but haven't done as much with it.
Working on a way to bend those two inner short lengths of 1.5" pipe so they will align with the R1 carbs
.....O O.......O O..... L head intake ports
....O....O....O....O.... R-1 carbs
The outer tubes are almost straight and close to lining up. The inner two have to bend slightly inward go a few inched then reverse bent to straighten again. I figure two 20 degree bends would do it.
Tried welding these together months ago but dismal failure. (just didn't have the skills) Tries again and it seemed to fall together. Cut up enough for two sets of the double bend tubes tacked together and welded them...
The end result was.... ok They are now coated with dull gray rust paint and drying. The plan is to remove the paint on the head side when I weld them to the flanges rather than trying to paint into all the hard to reach spots when together..