1968 V-8 motor mounts is what you will need. (1968 V-8 frame mounts as well if you are converting from an OHC-6 If the car was a V-8, then you need only find the motor mounts.)
Any other "brackets" that are you referring to? Such as accessory brackets?
It's all about the blocks and their mounting holes. Pontiac used the same mounting locations and added extra holes in the later blocks to accommodate the different body styles that the motor might drop in to. The '71 block should have 5 drilled and tapped motor mount holes on each side. You'll only need to use 2.
Prior to 1970, the Firebird (F-body) and Tempest (A-body) body styles used the same motor mount holes. The Firebird was changed in '70, but the Tempest stayed the same, hence the multi-use requirements. Some later blocks - 1977, for example - don't always drop in to the Firebird without the proper adapters.
Never mind (Quenton beat me to it and provided more detail anyway)
Welcome to the site just the same.
Last edited by salmon38; 06/02/1005:46 PM. Reason: Got beat at the light
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
I own a 1967 Firebird Convertible with a 1971/72 Pontiac 400. Original engine was a 326. Problem: My harmonic balancer is about an 1/16" to 1/8" from the K frame. Could this be because of incorrect motor mounts being used?
I own a 1967 Firebird Convertible with a 1971/72 Pontiac 400. Original engine was a 326. Problem: My harmonic balancer is about an 1/16" to 1/8" from the K frame. Could this be because of incorrect motor mounts being used?
It could also be the late model harmonic balancer being larger or the crank pulley (on mine the pulley is larger than the balancer). I know the subframe crossmember has a niche in it to help clear both.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
Yes, they are very different and use completely different motor mounts. But the blocks are the same.
I believe that the early 326 used a different balancer design than the 400 and the all later (68 and up) motors. That may be why there's less clearance and no notch. I have a 67 and 69 subframe I can check out later to compare the two, but I don't have a 326 balancer to look at to see if I am correct. Perhaps one of the other guys here with more than one car can compare for you.
I would have to look at the design of the subframe just to be sure that the notch isn't welded shut. Unless you can cut it and then weld it ... all speculation on my part.
Does not look like the notch was welded shut. Just no visible notch. Thought about looking into the harmionic balancer. I think I am going to have to resort to shimming the motor mounts. Anyone have any experience with shimming motor mounts?
67-69 F, 65-70 B, 72-74 X bodies used the same mounts. Everything else is diff. 67 and earlier engines have a shorter crank with smaller dia balancers, but later models fit no problem. I've had 62 thru 78 combos in mine over the years.
Looks like the back side of the cross member does angle down to form a low spot (notch). However, the first belt groove of the pulley/balancer still sits over the cross member leaving me no room. Will have to do some additional detective work.
67-69 F, 65-70 B, 72-74 X bodies used the same mounts. Everything else is diff. 67 and earlier engines have a shorter crank with smaller dia balancers, but later models fit no problem. I've had 62 thru 78 combos in mine over the years.
Realized i didnt give all the info. Thats mounts only, not brackets. The 72 should be a direct bolt in IF your car has the 4 correct mount "brackets". If all 3 mounting points are correct, the balancer will clear the x-member.
I wonder if the trans mount might be too tall, tilting the front of the engine too far down? I looked at three subframes last night. Each has a top-hat section in the lateral cross-member joined with a flat (what looks like) rectangular tie-in. I wouldn't want to cut anything in this area without being able to reinforce the cut-out section. The forward lateral carries little load, but the rear one carries a lot of the cornering loads.
OK. Still trying to figure out why the crank pulley is sitting so close to the cross member. After looking at one at a car cruise I believe that the engine is mounted to far forward. I was unable to view the engine compartment to look at the motor mount locations but went back and looked at mine. If the front of the car(driver side)is to your left I have one mount hole open then the motor mount is bolted to the next one in line.
1)Does anyone know which mounting holes are suppose to be used on a 1972 400 block for mounting in a 67 bird? 2) Are there additional holes for mounting the tranny cross memeber further back?
That's what I thought. I think by using the second mounting hole the engine is to far forward. Leaving about 3 inches from the distributor and the FW and placing the crank pulley directly over the cross member. Maybe the first hole was not tapped. I read that not all mounting holes were always tapped. Now I have to see if I can move the transmission support back or see if the tranny has other mounting holes as well. Thanks