knuckles

iTrader: (9)

how big can i go on a 5.3l iron block i want to bore out to 3.903 can i and how much wall thicknes will i have?

ZZebes

iTrader: (10)

all 5.3L blocks were designed to be safely punched to 5.7L Bore

knuckles

iTrader: (9)

yea but how far can i go and still be safe?

RandomHero

iTrader: (24)

5.7....

knuckles

iTrader: (9)

in bore dia. and still be safe i have forged pistions that are 3.903 is that safe?

ChevyThunder17

iTrader: (45)

I'm wondering the same question not too long ago. Stock LS1 block bore is 3.898", I usually go for 3.905" bore. Given that the 5.3 has the extra thick sleeve (it was supposed to be a iron 5.7, GM designed it for the B-bodies then dumped the platform) I would say that you'd be alright with a 3.903" bore. It's only 0.0025" less cylinder sleeve. I'm bringing my 5.3 iron block to 3.905" as soon as I get the cash for it (selling my 382 setup to fund my project).

YMMV.

mguthr1

iTrader: (3)

nice, im about to do the exact same thing......what are some good pistons or would you recommend the stock ones......

ChevyThunder17

iTrader: (45)

What are you going to be doing with the truck modwise? Expected power levels?

knuckles

iTrader: (9)

sweet thanks