engine mounts location: 350 to 250 ?

[R72K5]

can anyone tell me if the location of engine mounts on 350 blocks are in same place as on 250 blocks- distance from there back to bellhousing flange ? IE: will 250 go in place of 350 without having to move tranny ? i take it engine block brackets differ between the two? 73-up*

thanks

 

[the professor]

the short answer is no..
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the 250 sits back into the depression in the firewall.very close...

the V8 sits up further to clear the heads and the distributor
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the crossmember should go into provided holes in the frame, but you will need a shorter front drive shaft..
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and I think there are holes for the motor mounts too
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haven't replaced a V8 with a I6, but I have done it the other way...
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You "can" put SB in place of a 6 on the same mounts, but it is close, and the valve covers are tough to get off..
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A BB forget it...need to hammer the firewall
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[R72K5]

this is on a 2wd, forgot to add that, i should have posted on 2wd board, dang, :S

i thought i had previously measured mounts to bellhousing distance between a six and a v8 and came up with pretty much same measurement, but cant remember now, which is why im trying to find out now,

thanks

 

[the professor]

Yea, the mount to bellhousing is the same..on all..that is the problem..the 6 is longer, and has nothing on the back of it..
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That is the soul purpose of the indentation in the firewall, to clear the 6cyl engine
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with the 6, the back of the head is where the V8 distributo is..with the bellhousing flange, sticking under the cabl

with the 8. the distributor and V heads, prevent the motor from sitting that far back, so the bell housing mountin flange is in front of the firewall
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Thats why you have to move the mounts back to move the engine back...
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You may also,not clear the radiator with the engine on the V8 mounts...measure from the motor mounts to the radiator
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I believe the actual setback is about 4 inches..
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[R72K5]

so, engine mounts move at frame rails and tranny stays put ?
i hope so,


thanks

 

[the professor]

No,no..I was not clear...the frame mount move back, and the trans moves back...
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[R72K5]

[ QUOTE ]
No,no..I was not clear...the frame mount move back, and the trans moves back...
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[/ QUOTE ]

crappy,
thanks