360 Block for 408

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69valiant21

69valiant21

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Hey guys, looking for 360 blocks for a 408 build eventually. Are some year blocks better than others? What should I be looking for and avoiding? Any info is helpful.
 
Only a sonic test will prove a block.


That said I've only seen one 360 that wouldn't go .060 and never found a 340 that wouldn't.
 
Latest ones you can find, so you can run rollers in it?
 
no, i was thinking late 90s, just before the magnums came along they made a run of roller rocker LAs...thats what i would look for
or, you could use a magnum of course

now, some people might argue the opposite way, to get one of the earliest you could find, because of better metallurgy
 
the 1974+ 360 blocks are better than 1971-3=they have a larger diameter main thrust bearing surface. the 360 magnum is 1993-2003. 1988-1992 360s had roller lifters, not roller rockers
 
Marcohotrod said:
the 1974+ 360 blocks are better than 1971-3=they have a larger diameter main thrust bearing surface. the 360 magnum is 1993-2003. 1988-1992 360s had roller lifters, not roller rockers
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thats all the stuff i was thinking off, look for one of thems
 
I found a '71 long block for $150 with an engine stand. The guy says it ran good when he pulled it 5 years ago.
 
Like people said any will do
Roller LA is a bonus and magnum is OK if your going magnum heads which most aftermarket ones are.
 
i just have the one
its a 74 360 that came out of a motorhome (i believe i paid 300 for it, with the 727 transmission)
i didnt buy it intending to build a 408 out of it, simply to replace the worn out slant 6 in my duster

when i got it home i cleaned it up, had the heads freshened up, put in a different cam and a 4 barrel intake and called it good
about 1000 miles later i spun a rod bearing

thats when i dropped it off at MRL to have him rebuild it is as 408
nothing too wild, she makes 420 HP and 470 footpounds of torque

only thing i would change is the flat tappet to a roller cam so i dont need to worry about zinc content in the oil
but thats not that big a deal, wallmart carries STP zinc adder for 3 bucks a bottle or so
 
diymirage said:
i just have the one
its a 74 360 that came out of a motorhome (i believe i paid 300 for it, with the 727 transmission)
i didnt buy it intending to build a 408 out of it, simply to replace the worn out slant 6 in my duster

when i got it home i cleaned it up, had the heads freshened up, put in a different cam and a 4 barrel intake and called it good
about 1000 miles later i spun a rod bearing

thats when i dropped it off at MRL to have him rebuild it is as 408
nothing too wild, she makes 420 HP and 470 footpounds of torque

only thing i would change is the flat tappet to a roller cam so i dont need to worry about zinc content in the oil
but thats not that big a deal, wallmart carries STP zinc adder for 3 bucks a bottle or so
Click to expand...
You are overdue to post a Go pro video of you out hooning. Lets see it pal!
 
aftermarket roller will cost more than your motor. If I were starting over and going roller, hold out for an OEM roller year block.
 
pishta said:
aftermarket roller will cost more than your motor. If I were starting over and going roller, hold out for an OEM roller year block.
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What do you mean more than my motor? More than $150 I paid for the long block?
 
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