When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
LTX and LSXPutting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.
Not sure how many on TGO have done it, but it's been done a lot on ls1tech. Most aftermarket engine suppliers use these blocks as the foundation for their 383 mills. (ATK, Texas Speed, etc)
Yup, they put thick liners in the aluminum blocks and there is tons of meat in the iron ones. It ends up being .118 overbore. Texas Speed offers a re sleeved 5.3 up to 4.125 in bore. It's a versatile block.
Things that make you go Hmm. I have a couple of LM7 5.3s. I also have (or will have soon) a set of LS7 heads from an LSX 454. Might be an interesting assembly.
Things that make you go Hmm.I have a couple of LM7 5.3s. I also have (or will have soon) a set of LS7 heads from an LSX 454. Might be an interesting assembly.
The texas speed re sleeved 5.3 block is also stronger than an LS7 block. It's also only $2k. This only works on aluminum 5.3's. Your stuck with a 3.898 max bore on an LM7.
The texas speed re sleeved 5.3 block is also stronger than an LS7 block. It's also only $2k. This only works on aluminum 5.3's. Your stuck with a 3.898 max bore on an LM7.
Figures. The LS7 heads, from what understand, have to be used with a large bore. Less than 4" won't cut it.
I also have (or will have soon) a set of LS7 heads from an LSX 454.
Won't fit on a normal LS engine, bud. You'll need to go big bore (4.125" or more) to use those heads. $$$$$
From my LS7 head research a couple years ago, I think those LSX heads are already ported use the Lingenfelter CNC program. It's not a factory LS7 head. Good stuff right there.
These are the heads in question. Still on the crate engine as purchased from GM but there's some Texas Speed stuff soon to take their place. The heads should be coming my way should I decide to make the move for them.
Thanks for the loan of the QUICKCHICKEN. And good luck with your project.
I cruised the Chevrolet website and sure enough the LSX454 head is literally "as cast" and not CNC ported. There are CNC ported heads available (which I believe use the Lingenfelter CNC program), but the crate engine didn't come that way.
Wow, that LSX-DR is so much different! It has a tiny 50cc combustion chamber with a massive 313 cc intake port volume. Definitely nothing in common with the factory LS7 head.
12-27-2019, 11:56 AM
