66vert

iTrader: (3)

I'm wanting to rebuild my 5.3 with a minor bore. Can someone recommend some forged pistons 3.80 bore X 3.622 stroke?

KCS

iTrader: (20)

What are the plans with the engine? Boost, nitrous, NA?

batboy

iTrader: (6)

If you are planning on N/A check these out:

http://www.texas-speed.com/p-741-wis...l-engines.aspx

66vert

iTrader: (3)

I was planning on boosting it. Looked at Wiseco, JE/ SRP, Mahle, Summit websites and couldnt find much info. Is there a stock replacement except forged .020 over? Thanks guys.

mark21742

You could just bore it out to a 5.7.....an iron block ls1 would handle lots of boost

KCS

iTrader: (20)

Wiseco K474M965:

http://www.wiseco.com/Catalogs/Automotive/Chevrolet.pdf

66vert

iTrader: (3)

I know this sounds totally old school and they are another company but when I was in high school shop; there was TRW. They were reasonably priced forged slugs. Anything like that?

salemetro

iTrader: (5)

Why the desire to bore it? Is is in NEED of one? If your plan is to boost, how much are you going to throw at it?

NemeSS

iTrader: (127)

yes. speed pro make a replacement hypereutectic up to .060
for both the 4.8/5.3. they use same compression height and wrist pin.but they are for the pressed pin older version rods.
also there is the dished version (5.3) piston
or flat top (4.8) piston
they have different part no.
i gonna see if i can find em again

66vert

iTrader: (3)

That would be awesome of you NemeSS

66vert

iTrader: (3)

the motor has 180K miles on it and probably never had some of the plugs change and missed a lot of oil changes so I wanna build a reliable motor. Boost will depend on whether or not I can get a reasonably priced forged crank.

69cutlassrkt

Why not save some money and use the stock crank?

https://ls1tech.com/forums/forced-in...k-1200-hp.html

66vert

iTrader: (3)

y2khawk has some impressive results with a stock crank. Thats for sure. Makes me think twice about running the stock crank. Thanks for digging up and passing along that thread.

salemetro

iTrader: (5)

Exactly. The 5.3 and 4.8 engines can take a pretty good amount of boost with stock rods, pistons, and crank....even more with 317 heads. That's why I asked why you were wanting to bore it. It might not even need a bore. Just freshen it up, widen the ring gap a bit, and throw the air at it.

66vert

iTrader: (3)

thanks for the advice and link fellas. I just picked up a set of 853 heads I was gonna try to port myself and use on the motor.