Re: 1975 Monte Carlo

by Fishgrinder Tue May 21, 2013 1:56 pm

Thanks for the offer Mali!

From what I read here: http://www.nastyz28.com/2gcog/motmount.html I assume small block brackets will work.

The ones I bought yesterday measure 2 5/8", so apparently they are not from a truck according to that site.

Chris: is it possible for you the measure the distance in your brackets?
http://www.nastyz28.com/2gcog/tech/clam-tape.jpg

by 1973 454 MONTE Tue May 21, 2013 2:11 pm

my 454 clams are 2 3/8.

if memory serves me right,when i put the 350 in my car i tried the 454 clams,but it would not fit.

so YES clams are different it looks like.

by Fishgrinder Tue May 21, 2013 2:29 pm

1973 454 MONTE wrote:my 454 clams are 2 3/8.

if memory serves me right,when i put the 350 in my car i tried the 454 clams,but it would not fit.

so YES clams are different it looks like.

So it's the bolt pattern against the block which is different, or the shape as well?

by 77mali Tue May 21, 2013 2:52 pm

Do you still need measurements? Mike look like the ones you posted from the Camaro site. Let me know.

by 1973 454 MONTE Tue May 21, 2013 2:55 pm

block is the same, shape is close.

bb on left
1975 Monte Carlo - Page 9 Bbsb10

bb closest
1975 Monte Carlo - Page 9 Bbsb110

by Fishgrinder Tue May 21, 2013 2:59 pm

Man, hard to see the difference for an untrained eye. Thanks Chris!

Mali: you don't have to bother, seems like I have to find some big block brackets now.

by 1973 454 MONTE Tue May 21, 2013 3:21 pm

Fishgrinder wrote:Man, hard to see the difference for an untrained eye. Thanks Chris!

Mali: you don't have to bother, seems like I have to find some big block brackets now.

http://www.ebay.com/itm/GM-454-CHEVY-ENGINE-MOTOR-MOUNTS-A-B-1973-90-11467-11609-/190769347388#ht_3007wt_806

by Fishgrinder Tue May 21, 2013 4:37 pm

1973 454 MONTE wrote:
Fishgrinder wrote:Man, hard to see the difference for an untrained eye. Thanks Chris!

Mali: you don't have to bother, seems like I have to find some big block brackets now.

http://www.ebay.com/itm/GM-454-CHEVY-ENGINE-MOTOR-MOUNTS-A-B-1973-90-11467-11609-/190769347388#ht_3007wt_806

Done!

by 77mali Tue May 21, 2013 9:01 pm

Glad it worked out. When are we going to see the new motor Very Happy

by Bruisr Wed May 22, 2013 1:07 am

I never knew there was a difference in the mounts! I was able to use my 350 mounts on my 454. Had no problems. Until I read this, I assumed they were the same. Funny thing is I now have a set that came with the 454 I just rebuilt, and I can't tell the difference!

by Fishgrinder Wed May 22, 2013 1:13 am

Since the 454 mounts only measure 2 3/8" from the bottom to hole centerline I assume the engine will sit lower in the bay compared to small block mounts. But if there is enough room under the hood, maybe it wont be an issue.

If I get the brackets by next weeked we'll lift the engine in Mali!

by 1973 454 MONTE Wed May 22, 2013 11:38 am

77mali wrote:
This is how you make Swiss cheese (but I'm sure you knew that)

by Fishgrinder Thu May 30, 2013 3:17 pm

Does anyone know what size the bolts for the frame mounts are? Do they need to be high grade?

by 1973 454 MONTE Thu May 30, 2013 3:32 pm

heads are 5/8 nuts are 11/16.

my guess yes and 1/2.

by Fishgrinder Thu May 30, 2013 4:19 pm

Thanks chris, but do you refer to the bolts that go through the mounts, or the three that clamp the mount to the frame? I was thinking about the latter.

by 1973 454 MONTE Thu May 30, 2013 4:40 pm

THROUGH THE MOUNTS.

by Fishgrinder Thu May 30, 2013 5:14 pm

All right, but do you also know the size of the mount to frame bolts?

by 77mali Thu May 30, 2013 7:19 pm

Here's a pic- I'll measure the length/diameter once I can find my calipers. The heads for the nut & bolt are 9/16". They way mine mounts to frame there are 3 bolt/nut assemblies used. But you may require 4 sets per side for the big block, not sure.

1975 Monte Carlo - Page 9 P1050510

by Fishgrinder Fri May 31, 2013 1:21 am

Great mali! I think there will be three on each for the big block as well.

by Fishgrinder Fri May 31, 2013 3:25 pm

Picked up the mounts today:
http://www.ebay.com/itm/GM-454-CHEVY-ENGINE-MOTOR-MOUNTS-A-B-1973-90-11467-11609-/190769347388#ht_3007wt_806

However, they don't measure 2 3/8" from the bottom to the hole centerline like yours Chris. They are just under 2 7/8". Truck mounts?

Can this 4/8" difference really cause a problem? I doubt it. Hoping to get the engine in during the weekend.

by 77mali Fri May 31, 2013 5:10 pm

Couldn't find calipers but looks as if:

Bolt length is 1-3/8" (34.925 mm)
Thickness is 5/16" (7.9375 mm)
Thread Count is 14

4/8" (1/2") or 12.7mm...LOL @ 4/8" Wink

by Fishgrinder Fri May 31, 2013 5:25 pm

Thanks, and don't lol at that 128/ 256 Wink

by 1973 454 MONTE Fri May 31, 2013 5:47 pm

Fishgrinder wrote:Picked up the mounts today:
http://www.ebay.com/itm/GM-454-CHEVY-ENGINE-MOTOR-MOUNTS-A-B-1973-90-11467-11609-/190769347388#ht_3007wt_806

However, they don't measure 2 3/8" from the bottom to the hole centerline like yours Chris. They are just under 2 7/8". Truck mounts?

Can this 4/8" difference really cause a problem? I doubt it. Hoping to get the engine in during the weekend.

holy shite. im sorry. 1975 Monte Carlo - Page 9 Icon_c10

im not realy sure. but i guess if you put all 4 of them on the motor than set it in the cradle,you can drill new holes. now im stuck.

by Fishgrinder Fri May 31, 2013 6:06 pm

No worries man! Just to be sure, this is the distance you measured and got 2 3/8?

1975 Monte Carlo - Page 9 Clam-tape

I also have the 2 5/8" small block pair, which probably will fit according to Bruisr.

But hey, can 1/2" really cause a problem?

by 1973 454 MONTE Fri May 31, 2013 7:47 pm

yes mine are really 2 3/8

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