Engine frame brackets - how far back? - Team Camaro Tech
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post #1 of 14 (permalink) Old Oct 12th, 05, 07:16 AM Thread Starter
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Question Engine frame brackets - how far back?

For reasons known only to the previous owner, I have extra mounting holes in the engine cross member for the frame brackets. I'm sure they were trying to fit something in the car without having to hammer on the firewall (thank God!).

I know that the brackets will hang off the back of the cross member when properly installed..... but how far? They're 350 brackets. Like I said, I have several holes to choose from.... they all look factory. I can't figure out which ones are TRUE factory holes.

Right now, there's a good 1" or more of overhang on the big end which seems like WAY too much, and maybe 1/2" on the small end on the drivers side bracket. The pass. side bracket has no overhang on the small end.

Can someone give me some measurements or idea exactly how they should be mounted?
Thanks all!

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post #2 of 14 (permalink) Old Oct 12th, 05, 09:29 AM
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Re: Engine frame brackets - how far back?

I believe it to be correct. The drvr side needs some as it is the attachment point for the clutch return spring.

Somebody has posted pics of the placement of said mounts.

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post #3 of 14 (permalink) Old Oct 12th, 05, 01:17 PM Thread Starter
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Re: Engine frame brackets - how far back?

Yeah, I looked.
I don't need to attach any clutch parts.

I see pictures once in a while and they never looked to be so far back. Maybe it just doesn't seem that way in pictures.
I guess I can drop the block on them and see how close the HEI is to the firewall.

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post #4 of 14 (permalink) Old Oct 12th, 05, 01:29 PM
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Re: Engine frame brackets - how far back?

But, the bracket having the hole in it for the clutch spring is the drvr's side bracket. Others here have had the pass & drvr mounts swapped and this places the engine way forward and the trans bolts do not go into place.

As for distance from firewall to distributor, with 307/327 mounts, HEI will fit. With 302/350 mounts, clearance is needed.

I find there will be plenty of room if:
1. The harmonic balancer is directly over the sway bar
2. I can place a 9/16 box end wrench onto the bellhousing bolts from above.
3. The heater hoses are not cramped for space.
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post #5 of 14 (permalink) Old Oct 12th, 05, 01:53 PM Thread Starter
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Re: Engine frame brackets - how far back?

Well, these aftermarket brackets are what was on the car when I bought it, and it had a 400ci installed with an HEI. I had no problem unbolting the trans from the block from above. The firewall has never been dimpled.
There are no other holes in them other than the engine mount holes. Before I painted them, they were labeled for a '69 with 350, but we all know how aftermarket parts are.
The taller bracket is the passenger side, the shorter bracket is the drivers side.... correct?
Maybe I'll take some preliminary measurements and see how far back the block is gonna sit before I go hoisting this thing around the garage.

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post #6 of 14 (permalink) Old Oct 13th, 05, 04:23 AM
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Re: Engine frame brackets - how far back?

You might try DavePozzi's site for measurements.
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post #7 of 14 (permalink) Old Oct 13th, 05, 07:23 PM Thread Starter
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Re: Engine frame brackets - how far back?

So much for test fitting the engine.
The ram on my hoist decided to test my reflexes today.
Looks like a trip to Harbor Freight will have to happen first.
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post #8 of 14 (permalink) Old Oct 13th, 05, 07:45 PM
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Re: Engine frame brackets - how far back?

Joe -

See if these photos help. They are of the small block stands that were on the 69 when I bought it.




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post #9 of 14 (permalink) Old Oct 13th, 05, 09:45 PM
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Re: Engine frame brackets - how far back?

Here are pics of my orig GM mounts with the part numbers on them in my 69, if that helps

http://hobbystage.net/camaro/media.c...1153314-000055

http://hobbystage.net/camaro/media.c...3775478-001443

http://hobbystage.net/camaro/media.c...1153314-000055

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post #10 of 14 (permalink) Old Oct 14th, 05, 05:14 PM Thread Starter
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Re: Engine frame brackets - how far back?

Eric and Jonesy, those pics are EXCELLENT. They're sitting right where mine are. Thanks guys!
I just couldn't remember what they looked like when I took them off 6 years ago.

Holy crap.... now I know why there are extra holes in the crossmember about 3/4" forward of the factory holes. I got a measurement of 14.5" from the rear surface of the block to the inside of the rear-most ear of an engine mount. With the way the engine angles down, and the size of the HEI, it obvious the previous owner moved the block forward for fitment purposes. That 14.5" will push the distributor into the firewall.
DANG!

Back to the drawing board.

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post #11 of 14 (permalink) Old Oct 15th, 05, 08:38 PM Thread Starter
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Re: Engine frame brackets - how far back?

.... and the drawing board says "Warm up your BFH and go to town!"

Looks like I either get a small body HEI (out of the question) or massage the sheetmetal some.
It took me a little while to realize that mounting the engine further forward in a car like the Camaro is a big no-no. Center of gravity and changing the handling charactoristics for starters.

I hate to destroy a perfectly nice firewall.
All in the pursuit of happiness I suppose!

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post #12 of 14 (permalink) Old Oct 15th, 05, 08:51 PM
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Re: Engine frame brackets - how far back?

Dont bash it !!! Get a good dual point dist. and a msd box ,
Thats the way i avoid bashing the firewall and works as good
as the hei does in my opinion. Frank

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post #13 of 14 (permalink) Old Oct 15th, 05, 09:23 PM Thread Starter
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Re: Engine frame brackets - how far back?

Unless I find one in perfect shape in the junkyard (highly unlikely), any new engine parts are out of the question right now.
I really see no choice in my situation.... unfortunately.

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post #14 of 14 (permalink) Old Oct 16th, 05, 05:09 AM
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Re: Engine frame brackets - how far back?

Joe, I had an HEI in my car with no firewall massaging. There was about 1/2" clearance. This was using repro 350/302 mounts.

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