Boring an 012 block

[95' regal gs]

Anyone know how large you can go on the bore size of an 012 off center 3.8 stage II block? Can you take them out to 4.1 4.00in bores?

 

[BlownV6]

Ill guess at this. You have about a 2% chance that you could do that. A 3.8 block is made to have a 3.800 bore with say around .200 thick cylinder walls , when you bore it .200 then the cylinder walls are down to .100 thick and thats not enough. However there were a few 3.8 blocks (badges and part numbers) that were actually 4.1 castings with much heavier cylinder walls. Have it sonic checked and talk it over with your engine builder. Mike

 

[stagemonster]

Ill guess at this. You have about a 2% chance that you could do that. A 3.8 block is made to have a 3.800 bore with say around .200 thick cylinder walls , when you bore it .200 then the cylinder walls are down to .100 thick and thats not enough. However there were a few 3.8 blocks (badges and part numbers) that were actually 4.1 castings with much heavier cylinder walls. Have it sonic checked and talk it over with your engine builder. Mike

+1

 

[95' regal gs]

Thanks guys, I just wasn't sure if a 3.8 stage II was simply a 4.1 with thicker cylinder walls to get the smaller bores.

 

[Lee Thompson]

#

Just to clarify---I see it posted alll the time---4.1 standard bore is NOT 4.00 in. but 3.965

 

[95' regal gs]

Just to clarify---I see it posted alll the time---4.1 standard bore is NOT 4.00 in. but 3.965

You know, I think I knew that, somewhere rattling around in my head. Thanks for the clarification though, now I won't forget again... wait what were we talking about? Oh yeah, where'd I leave my beer?