Picked up this manifold over the weekend. Just wondering why the end runners are not drilled for the bolts. I was told it is a early 232
There is a bar that goes across the flat spots and the bolts go through the bar. I used a piece of 1/4" steel to make solid ones because I didn't have the stamped pieces. I think these are early 232ci and 259ci. later intakes for the 289ci have bolt holes built in. similar to the 2 bolt Vs 4 bolt valve covers.
flt-blk has it right. I am at work right now so I can't post a pic of what he is referring to. You can see on the pad above the heat crossover, there are marks from the clamp being torqued. I will post a pic later when I get home and can access my pictures.
I found a couple pictures on my computer STU-V on the left and Weiand on the right This was a mock-up so don't pay attention to the guide pins instead of bolts
I do believe that most, if not all, of those aftermarket manifolds made through the 60's n 70's, were all sized for the 232 ports. They'll work on the larger Stude mills, but you will lose some top-end flow. 'Course, you'll have nice velocity on the low->mid range. & just how often or long, do you run at 6-.7k anyways... . Oh, & you can only grind out so much as there isn't that much extra material to work with. Saw one a couple of years ago that had the "too much grinding" refilled/replaced w/epoxy. Manifold still went for a pretty penny. Marcus...