block casting #25524140 vs 109 block?

[buick83-T]

Is the 25524140 casting block any different in strength than the 86-87 109 block? the 140 casting is from 85 rwd 3.8. This also has 20 bolt oil pan instead 14 like earlier years. Any better than the 290 casting from 83 3.8 block? Its same as 109 block except for rough casting in lifter valley area correct or not? Would the 140 casting be a good block to use on the 83 turbo buick is why asking?

 

[jasjamz]

140 blocks require different head bolts/studs because of the thread starting points. They have a higher deck height than the 109 which will lead to lower compression ratio using the same parts. As far as strength, if your using a hot air setup, you wou't be making enought power due to the limited parts available to worry about breakig a block due to too much horsepower. Detonation does more damage to these engines. A stock hp engine detonated enough times will lead to failure with either block.

 

[WarWagon]

I pretty much just told him the same thing the B4B section.
Very nice advice.