I need schooling on 5.3 blocks
01-20-2014, 08:47 AM
#2
The older gen 3 iron block 5.3L - LM7 are just about identical to the ls1/ls6 blocks. The alternator mounting is differant from iron to aluminum. The iron blocks are missing one of the threaded holes that the aluminum block uses for the mounting bracket. People have drilled and taped the the iron block to use the F-body alternator mount.
All the covers will bolt right on from the aluminum to iron, and you can bore the 5.3L out to a 5.7.
All the covers will bolt right on from the aluminum to iron, and you can bore the 5.3L out to a 5.7.
01-20-2014, 10:12 AM
#5
You can get 383ci with a 4" stroke, and 395ci with a 4.125" stroke. The 4.125" stroke crank can be tricky and can end up a disaster if not done properly, so I'd suggest a 4" stroke max.
The differences are basically cosmetic. The main saddles are beefier on the aluminum blocks since they're aluminum, and the big water plug is different. That's about it though.
The differences are basically cosmetic. The main saddles are beefier on the aluminum blocks since they're aluminum, and the big water plug is different. That's about it though.
01-20-2014, 10:29 AM
#6
Sweet. What's the weight diff between the cast 5.3 and the LS1? FYI, the reason I'm interested is my stock LS1 block may have a couple of cracked slaves and I can get my hands on a iron 5.3. I wonder what the cost to resleve is vs boring and building a 5.3....
Trending Topics
01-20-2014, 05:38 PM
#8
TECH Fanatic
It cost me $300 to bore and torque plate hone my 5.3 block 0.124" over to 3.903" bore. This was at HKE in Houston in 2011.
My advice is try to find a used 6.0 block before dropping that money on a 5.3 block. Everything that swaps over to the 5.3 block will also work with the 6.0 block. They are identical except for the bore size.
My advice is try to find a used 6.0 block before dropping that money on a 5.3 block. Everything that swaps over to the 5.3 block will also work with the 6.0 block. They are identical except for the bore size.
01-20-2014, 07:44 PM
#9
It cost me $300 to bore and torque plate hone my 5.3 block 0.124" over to 3.903" bore. This was at HKE in Houston in 2011.
My advice is try to find a used 6.0 block before dropping that money on a 5.3 block. Everything that swaps over to the 5.3 block will also work with the 6.0 block. They are identical except for the bore size.
My advice is try to find a used 6.0 block before dropping that money on a 5.3 block. Everything that swaps over to the 5.3 block will also work with the 6.0 block. They are identical except for the bore size.
I apreciate all the info gents.
