boring a 5.3 to 5.7?

**FORMULA7** · 03-14-2007, 11:41 AM

I bought a 5.3 block and was told that they could be bored over to a 5.7. Now what is the final bore for the 5.3 to achieve the 5.7 aluminum bore?I need to know how much to tell the machine shop to bore it over.

**FORMULA7** · 03-14-2007, 03:58 PM

Anyone have any info?

**BlackLT1Z28** · 03-14-2007, 04:27 PM

Depends, what's the stroke?

**mrr23** · 03-14-2007, 04:57 PM

you cannot bore the 5.3L (3.77 inches)out to the bore size for the 5.7L (3.898 inches).

**FORMULA7** · 03-14-2007, 05:14 PM

From what I was told it can be done.I think diffrence is .118 from 5.3 to 5.7.Stock stroke..

**mrr23** · 03-14-2007, 05:17 PM

the only bores i've ever seen that could be bored past .060 is the old chevy big block motors. the 5.7L can only go .010" and the 6.0L can go .060". only one way to find out.....

**FORMULA7** · 03-14-2007, 05:39 PM

Yeah I also came across some ls1 type website I believe it was a truck site and in some of the customers cars it listed thier 5.3's bored to 5.7.

**BlackLT1Z28** · 03-14-2007, 05:52 PM

Maybe if you resleeved the block.

**lsdeuce** · 03-15-2007, 09:36 AM

you can bore a 5.3 to be 5.7 if you have a castiron block you can also bore a 4.8 to be a 5.7 but you have to use the 5.7 stroke crank your 5.3 bore right now is 96mm and your going to bore it to 99mm so yes it will work if you have a cast iron block if you have a aluminum 5.3 you will have to have inserts put in the block and that is very expensive good luck

**mrr23** · 03-15-2007, 10:42 AM

well then, i have learned something new. man those will be some thin walls.

**Hi-Po** · 03-15-2007, 07:32 PM

Holy smokes! What are your ultimate plans for this engine? I have never heard of anything taking that much from the bore. But that doesnt mean its not possible. But why? If it can be done, Your walls gotta be get'n scary thin, I would think. IMO, It doesnt sound economical.

**BlwnCamaro** · 03-15-2007, 07:49 PM

The 4.8 cast iron block and the 5.3 block can both be bored to 5.7. They call them the poor mans 5.7 cause you can get for cheap. They made the liners really thick on those blocks, and they share the same stroke as the 5.7's! Hope that helps you, I' ve got big plans for the local 4.8's and 5.3's in the wrecking yards!

**jay_lt4** · 03-17-2007, 06:09 PM

Originally Posted by BlwnCamaro

The 4.8 cast iron block and the 5.3 block can both be bored to 5.7. They call them the poor mans 5.7 cause you can get for cheap. They made the liners really thick on those blocks, and they share the same stroke as the 5.7's! Hope that helps you, I' ve got big plans for the local 4.8's and 5.3's in the wrecking yards!

the 4.8's do not have the same stroke as the 5.3 and 5.7

**Chevythunder17** · 03-22-2007, 07:17 PM

Why not just pick up a 5.7 block? They are all over the place, save some weight and reliability. You are talking thining out the cylinder walls well beyond their service spec.

Just because you CAN do something doesn't make it a good idea.