350 to 427 talldeck swap into a 76 jimmy 4x4 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-03-2010, 05:54 PM
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350 to 427 talldeck swap into a 76 jimmy 4x4

hi, so i recantly blew my motor in my 76 jimmy 4x4, it had a 350 sbc in it.i got a hold of a 427 talldeck out of a old gmc 6000 firetruck and was hoping to do a motor swap, just woundering if it would bolt up to my trany"350 th" if i got a bbc flywheel, and if i need new motor mounts, thanks in advance also any tips on how to make a few more hp and tourque would be good on a tight bugedt "im 17"

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Old 08-03-2010, 06:43 PM
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The tall deck blocks are kind of boat anchors wthout a fairly significant investment. Heavy, four ring pistons, obviously a taller deck height, ect. This all adds up to some specialty parts. In stock trim, they made gobs of torque down low, but are all done by 3000 - 3500 rpm. They have been used in some high power builds, but it involves specialty pistons, intakes, ect. As a budget build, they are not a good starting point.
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Old 08-03-2010, 06:49 PM
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alright well the motor was just rebuit and i picked it up for a really good price and i kinda want to make it fit in my truck, dont supose u could help me about the motor mounts situation, thanks also what if i ran turbo(s) could the botomend handle this stock???? only got 1000 km after rebuild

Last edited by mr dude; 08-03-2010 at 06:57 PM.
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Old 08-05-2010, 09:01 PM
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tall deck

the factory tall decks have good crank and rods but heavy pistons makes good low end power but i wouldnt rev it over 4500 in stock trim.i also have a 427 tall block but got 6.585 rods with car pistons i drag race it makes awesome power.

Last edited by willis 77; 08-05-2010 at 09:13 PM. Reason: wrong size rod
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Old 08-05-2010, 09:06 PM
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Quote:
Originally Posted by willis 77
the factory tall decks have good crank and rods but heavy pistons makes good low end power but i wouldnt rev it over 4500 in stock trim.i also have a 427 tall block but got 5.585 rods with car pistons i drag race it makes awesome power.
You might want to re-visit the rod length. They'd be about an inch short.
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Old 08-05-2010, 09:11 PM
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Here's a tall deck build I posted a while back....
Cheapo BBC 505 tall deck grunt motor
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Old 08-05-2010, 09:12 PM
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rods

youre right 6.585 my bad.instead of a 6.135. in a tall block youre 10.2 where a short block is 9.8
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