Motor mount direction

[JointTech]

I got some energy suspension clamshell inserts. The clamshells have been off for awhile and I didnt think there where any alignments that matter...

I do remember that when I removed the mounts and clamshells there was only a bottom bolt on one side and it was smaller than the others. Probably because a bigger one wouldnt fit through the misaligned hole.

This is a SB350. The truck came with a 402 so I wonder after reading about differences between the mounts on BB vs SB maybe thats related.

Furthermore theres no way to get the inserts to match the directions unless you flip the clam shell around in which case none of the holes line up.
http://oi49.tinypic.com/14azj8h.jpg
This guy seemed to have a similar issue.
http://ls1tech.com/forums/conversion...t-inserts.html

Are these not stock? Any info on them? I drilled the hole out and ran a bolt through but it makes me wonder which way is up etc.

[jdw]

Here's a bump for you. Are those the big block framesstands? I thought the BBCaand sbc had different stands.

[JointTech]

truck was originally a BB. Had a SB when I bought it and the clamshells from what I remember seeing through the grease were attached with a small bolt on the bottom that didn't really fit on one side and no bolt on one of the bottoms.

[Rude Ron]

Wasn't the 72's the first C-10 year with clamshell style motor mounts?

[JointTech]

no idea. this is a 72 though

here where they had just a small bolt on one side and no bolt on the other.
I drilled out the holes and put a big bolt in it.


but the thing is it makes the tabs the wrong way. at least according to this pic.

The only way to get the tabs to match that pic would be to spin the clam shells 180deg. But then none of the bolt holes would line up. You can see the clam shell holes are slightly wider on one side.

[JointTech]

ok so according to this post i have big block "perches"
http://67-72chevytrucks.com/vboard/s...37&postcount=5

And the clam shells are the 72+ style.

what im not sure of is if the clam shells were used on BB and SB in 72?

[jdw]

I believe you need small block perches

[kwmech]

The clam shells in the picture are NOT 1972. They are 73+

[WIDESIDE72]

Originally Posted by kwmech

The clam shells in the picture are NOT 1972. They are 73+

I am thinking the same thing. 72 big block clamshells and perches look similar to 73+ clamshells and perches, but they are different and you cannot mix the clam and perches.

[Lee H]

The clam shells are a major PIA. I went with tubular mounts.

[JointTech]

maybe why there were bolts missing when I took it apart. somebody else tired of messing with it and it did keep the engine from falling out

[kwmech]

You can use the clam that bolts to the block but you'll have to buy the correct mount.

[JointTech]

im sooo close


I think a pry bar and a friend and Ill get that bolt through. Bolt is through on the other side.

[Ironangel]

The 72 SB mounts, (at least both of mine) look like this These bolt to the motor. One 1"-7/16NC bolt the two together

[JointTech]

thanks for the pics. now if i could find some of those perches for sale Id get them. they want more than they are worth Imho as repops.

[Money_pit]

I'm going through same battle myself. I went ahead and ordered the cpp sheet metal engine stands with the pro thane bushing they claim an 1"1/4 more clearance than the tubular stands. Waiting patiently for them to get here. Maybe another option for ya

[JointTech]

you got a link to those? Their site sucks and I don't want to pay for tubular mounts. cant find the ones you mention.

[john]

Here are some pics of 72 and 73 up mounts. The 72's only have one hump on the top, like yours where the 73's up have two. I wonder if the clam shell plates have been mixed up with newer ones?
http://67-72chevytrucks.com/vboard/s...d.php?t=353151

[JointTech]

the PO was a goof... who knows what came from what.

Well a little redneck strategery and I think I got it.
I put the perches on the mounts and then lowered it all in and bolted the perches back in.

Im now thinking maybe if I had just loosened the perches I could have gotten it but this was easy enough.

Now whether this is "correct" or not I don't know but as long as the tranny goes in I think im fine.

[Money_pit]

http://m.ebay.com/itm?itemId=281250443590
Maybe that will work for you. I agree their site just irritated me. I was actually lucky enough to find them on their eBay store

[JointTech]

those look slick. if my tranny ends up not fitting I may pick up a set.

[JointTech]

so I just tried to put my headers on and the drivers side now hits the frame. I thought my prybaring would work but its not right. Going to pull the motor back out this weekend and do some more fiddling.

[cooperhw]

Originally Posted by WIDESIDE72

I am thinking the same thing. 72 big block clamshells and perches look similar to 73+ clamshells and perches, but they are different and you cannot mix the clam and perches.

Oh contrair Sir, you say you cannot mix the clam and perches.[/QUOTE]
Well, "Girls do it all the time". Been doing it for years.

[WIDESIDE72]

Originally Posted by WIDESIDE72

I am thinking the same thing. 72 big block clamshells and perches look similar to 73+ clamshells and perches, but they are different and you cannot mix the clam and perches.

Speaking from personal experience.

[JointTech]

well i dont know what perches or clams I have but the headers are on and it fits.


whew!!