Muffracing

Has anyone ever heard of boring a 5.3 .125" to make a 5.7. I read about someone doing it, but i can't remember where. Does anyone know if this would work for a street engine? Would you have to hard block it?

itchygomey98

iTrader: (2)

For 600 bucks you can have a new LS1 block. I would go that route before I would consider the option you are thinking.

Muffracing

A new aluminum block? Where?

itchygomey98

iTrader: (2)

Texas Speed. Look over there---------------->

itchygomey98

iTrader: (2)

By the way, what part of MN are ya from? I'm from ND originally. Can't say that I miss the winter there.

Muffracing

Southeast. Owatonna. winter Sucks!! Cant drive anything nice. Cant ride Harley. Negitive 16 degrees last night. One above for a high today. Icant wait till I'm done with school. I'm heading south!!

itchygomey98

iTrader: (2)

I feel for ya. I had a 66 chevelle for about 8 years, and ony got it out about 3 times a year because of weather. I'm glad I don't have to shovel winter anymore!

driftpin

I was told you can only bore the 5.3 truck blocks .125 over because it's an iron block. I had never heard of boring anything that far without sleeving it but the truck guys say it works fine for stroking a 5.3/325 out to a 6.3/383 with a 4" crank stroke.

Bo White

iTrader: (59)

Damn, hell yeah on the block prices from Texas Speed!! I can do stuff alot cheaper know .

Muffracing

Those prices are awsome. They are half the price of Scrooge and Dicky. I'd rather have the LS6 for $800.

Steve - Race Eng

iTrader: (1)

I machined a 5.3 block for MID sleeves a while back. It appears what GM did was to install a heavier wall sleeve in the 5.7 block casting to reduce the bore size and create the 5.3. In other words, yes you should be able to bore the engine to the same bore size as the 5.7 block.

Steve

MUSTANGEATER

iTrader: (10)

Is the 5.3 block Iron or Aluminum?

driftpin

The 4.8 and the 5.3 are both cast iron, aluminum head engines. Some select 03 5.3L were cast from 319-T5 aluminum.

driftpin

I wasn't aware that the 5.3L cast iron blocks were sleeved, only the very few 03 5.3L aluminum blocks were sleeved in the same way that the rest of the Gen III aluminum blocks were cast. Correct me if I'm wrong.

Bo White

iTrader: (59)

The SSRs had the aluminum 5.3s.

driftpin

Yes I know that, but what cast iron block has sleeves and what application was it used in. This is what I thought to by false. Is it a block only sold aftermarket? If so, where do you get it?