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Max safe bore.....LSX iron block....22psi+ boost

 
Old 05-23-2019, 12:04 PM
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Default Max safe bore.....LSX iron block....22psi+ boost

Thinking of swapping my Callie’s rotating assembly into an LSX iron block for the 6 bolt capability.

But was also wondering how much bore I can go to also get more cubes while I’m at it......without changing my 3.825” Callie’s crank.
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Old 05-23-2019, 12:18 PM
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I'm not experienced enough with the LSX blocks to recommend a max bore, but am curious why you're worried about really big cubes with boost? In my opinion, there's some advantages beyond just cylinder wall thickness to keeping the bore on the smaller side with big boost.
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Old 05-23-2019, 12:23 PM
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22PSI from what? Plenty of people run that block as a 434 and enough boost to make 1300+hp. That stroke will limit your cubes, but you can probably still get 408-413CI out of it with a 4.125-4.150 bore.
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Old 05-23-2019, 04:27 PM
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Why would you want to knock all the strength out of the cylinders?

Pointless
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Old 05-23-2019, 04:41 PM
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Originally Posted by rotary1307cc View Post
Why would you want to knock all the strength out of the cylinders?

Pointless
Hence the question............
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Old 05-23-2019, 04:43 PM
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Originally Posted by jrtoffroad View Post
I'm not experienced enough with the LSX blocks to recommend a max bore, but am curious why you're worried about really big cubes with boost? In my opinion, there's some advantages beyond just cylinder wall thickness to keeping the bore on the smaller side with big boost.
Because Bob at Brute Speed said 388ci - 402ci is rather small for an F1X Procharger. He recommends a 427-454ci. He never said a smaller engine will not make great power, but it will make a lot more torque with more cubes.
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Old 05-23-2019, 04:45 PM
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I am convinced you will never actually finish a build.
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Old 05-23-2019, 04:45 PM
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Originally Posted by SLOW SEDAN View Post
22PSI from what? Plenty of people run that block as a 434 and enough boost to make 1300+hp. That stroke will limit your cubes, but you can probably still get 408-413CI out of it with a 4.125-4.150 bore.
F1X
So a smaller 427ci would be well within the safe range. But I need to know how large of a bore that block can go and still be WAY strong with no worries.

Last edited by stilealive; 05-23-2019 at 10:18 PM.
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Old 05-23-2019, 04:46 PM
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Originally Posted by ddnspider View Post
I am convinced you will never actually finish a build.
Thats what I thought till I met the right guy at the right shop......local to me. He just finished his Procharged T/A.......he's the guy for the job. Most other shops are just full of ****, high and mighty, think they are gods gift.......bunch of cheesedicks. Like guys that work at gun stores...LOL Finally met a normal, down to earth guy that listens to what I want. And is a guru on Fbodys. Not easy to find.

Last edited by stilealive; 05-23-2019 at 05:00 PM.
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Old 05-23-2019, 06:10 PM
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Let's see the build pics!!!
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