I ran these manifold numbers through the search engines and looked at the ID charts and can't seem to find them. I know they are not Pontiac, obviously, the GTO written on the one is clearly wrong -- they came in a pile of Pontiac parts I bought. By the way, I am swapping to a small block in my 64 Dynamic 88 and was hoping I could use these but they don't look like they will clear the steering. Thanks for the help.

 

The one marked GTO is I believe from a mid 60's A body Olds big block. The other one is passenger side for a Toronado.

 

The one with the X casting is absolutely from a 65-67 big block. The other is from a later model. I'm not sure of the engine size. Looks too small to be a big block manifold.

 

Casting 406301 I believe is 71-? full sized. I've had a few of these and they do not have the ports separate like the 442 manifolds.

 

387992 Manifold is for 66 Toro... 406301 Manifold was changed to 412287 (8/75) and listing shows 70/73 F85 455...

 

As noted, 387992 is 1966 Toronado only.

406301 is 1971-72 full size with 455, period. It is not internally divided. It was never factory installed on a Cutlass. It may be a dimensional replacement for the A-body cars, but it does not flow as well as the 402295 "Z" manifold. Note the individual runners in the 402295. Also note that 412287 has individual runners like 402295.

406301:





402295:





412287:

 

As for the X manifold a 389269 would be mid 60's A body number wise. I was mistaken just looking at the X. The early one also had the heat riser in it where this one does not.

 

Thank you to all. I'll be selling or trading for one that clears my steering on the 64 88. Helps to know what I have.

 

What "small block" are you swapping into your 64?

 

Small block Olds 330, 350, 403?? I don't know about 1964 but 1965 all the way to and including 1970 "full size" B/C were rear steering box. I'm "assuming" 1964 is also. To put a small block Olds in the 1965/1970 full size, you'd need a Driver's side #2 and a passenger side #4. There may be others but I'm not sure.

 

Hallo all -==- I have a line on a 350/350 that I want to use. I had one in my 74 Cutlass Supreme and it was plenty powerful for what I want from this car. I could use a 403 too but wonder about lack of coolent flow between cylinders and cracked heads and overheating potential -- I do live in the desert after all. I had a 403 in a Buick and had no problems but that was Seattle. I am not stuck on a small block, just that they seem to present themselves more affordably. If a 400 425 or 455 showed up I might go that way as well but worry that the 200-4R I have wont hold up to the torque. Any advice on the 403 concerns and 200-4R use with big blocks is appreciated.

 

Again, I ASSUME you are talking about an Olds 350 and not a "GM" 350. Be aware that the second gen Olds motors do not bolt into the frame of your 64 Dynamic. The Jetstar 88 was the only full size Olds offered with the second gen V8 in 1964 (the 330) and the frame has unique engine mounting pads and trans crossmember provisions that are different from those in every other full size Olds that year. You'll need to fabricate the motor mount plates and weld them to the crossmember to replicate those on the Jetstar 88. You'll also need to find a J88 trans crossmember or fabricate a custom one. Also, Olds did not offer dual exhaust on the SBO installed in the 1964-70 full size cars, so there is no factory manifold for the SBO that clears the steering box in these cars. People have used the reproduction BBO manifold for the 65-70 full size cars. It's VERY close but does clear, possibly with a little grinding. If you only want single exhaust, the 330 in the 1964 J88 used casting number 380145 (#2) on the LH side and 381921 (#3) on the RH side. Also be aware that 380145 center dump manifold is unique to the SBO in 64-70 full size cars. The more common 384785 center dump manifold used on the BBO single exhaust applications in the 65-69 full size cars will not work on your SBO.

 

Yes, you assume correctly -- Olds all the way. Fabrication is not an issue as I have a full restoration shop and I have done countless engine swaps.and custom work projects. The info on the manifolds is very useful, thank you. Thoughts on the 403?

 

Understand. Unfortunately we get a lot of questions here from people who lack the skills and equipment to do the fabrication they want. It's difficult to know what each person's skill levels are. In 1964, the Jetstar 88 frame had two flat plates welded in the corners between the suspension crossover and the frame rails. These plates had a hole in each. The motor mounts had a threaded stud that went through the hole and was retained with a nut and washer from the underside. That should be pretty easy to replicate. The only problem is that the 1964 J88 used one-year-only motor mounts on the 330 that are not reproduced. Your best bet is to use the Anchor 2262/2263 mounts for the 1965-70 full size cars. These are nearly the same as the 64 mounts. The only difference is that in 64 the threaded stud was centered and the same mount was used on both sides. The 2262/2263 mounts have the stud offset and thus are different RH/LH. Since you'll be fabricating the plates anyway, you can drill the holes wherever they need to be to match. Also note that on these full size cars, the motor mounts bolt to the front two of the three threaded holes in the sides of the block (ignore the arrow pointing to the drain plug in this photo).

 

This is the 65-67 big block manifold I was mentioning in my post above. X casting but different part number.

 

Yes, but that won't work on the OP's 1964 full size. The outlet dumps right at the steering box.

 

These are manifolds that work on small block Olds in B/C 1965/1970 full size. Not for sale, I might need them, one day.

 

For single exhaust only. And note that the 64 cars did not use the #4 manifold on the RH side, they used the #3 manifold as I noted above.

 

Hallo all -==- thanks for the help so far. I picked up a 65 330 from Roger Green up outside of ABQ so will be proceeding with the SBO swap.

Are these the manifolds that will work on my 64 88? They say 65 and up B and C bodies but they had rear steering as well and left side has similar configuration the the 64 394 Starfire I have. Anybody use these?

From ad:

GM Starfire Delta 88 98 Dynamic Olds B&C body big block dual exhaust manifolds

 

You really only need the driver side manifold, which is available by itself. The normal 330 passenger side manifold works fine with a cap. The problem with this BBO manifold is that it isn't designed for the short deck SBO. I know people have used them with SBO motors in the 1965-70 cars and they are VERY tight, but do clear. I don't know if the differences in the 1964 frame and component location will still allow it to clear or not. I do know that it works on a BBO in a 63-64 frame, but again that's the taller deck height so there's an extra inch of clearance to the steering box.

 

Excellent response: thank you. Worth a try...