I think I fried my engine so I will obviously have to tear it down and rebuild it. I don’t want to spend a **** load of money on the rebuild so I was wondering if the 6L crank would fit in my 5.3 block and the stroke would be longer right? Im going to get a set of forged pistons and bore the block .030 to clean up the cylinder walls get everything balanced and blueprinted and do a little head work. I would get a stroker crank but a nice forged one runs about 700 bucks and I figure I can pick up a stock 6L crank for a lot less than that. I know my displacement will be close to 330 by boring the block over how much more of an increase would it be with a 6L crank if it will work.

 

A 6.0L crank is the same stroke as the 5.3L/5.7L. 3.622". You can bore your 5.3 block .120 over though if it passes the sonic test.

Offset grinding the crank is an affordable option to get more stroke, but you'd better not get too attached to your nitrous.

 

Sonic test? What cubic inch would that give me?

 

It would give you the same bore as a .010 over LS1. That way you could use off the shelf pistons. It only comes out to like a 347 or 347.5 though. You could make a 383 by throwing in a 4" stroke.

 

By boring ti that much am I going to make the cylinder walls too weak? Anbody know how much a good crank would cost me with the 4 inch stroke? The local speed shop wants like 650 for a forged eagle one I believe.

 

$650 is a decent price for a forged eagle 4"

If I was in your shoes, I'd find a nice 6.0 Block for this combination. after you've bought a crank and had machine work done, the only signifcant expense for the 408 would be the aftermarket pistons vs. stock/OS.

 

Well my problem is I am trying to keep cost down and also keep it kind of mild. I don’t want a 408 because I am going to be driving this truck everyday and I need decent gas mileage if I need more power I can flick a switch and have 175 more hp on tap. If I bore my 5.3 block .120 over will I have problems spraying the nitrous as far as cylinder wall strength and cooling problems. Maybe .090 over would be better.

 

I've never been a nitrous fan, so I'd still go 408...

but, if you just went .030" over, you could use readily available nitrous pistons, keep a nice wall thickness, use any 4.8/5.3/6.0 crank, and that would be a solid bottom end for a mild nitrous motor.

 

I like nitrous for the instant power that it gives oyu and it doesnt effect driveability like a big cam does to create big hp.

 

just find you a 6.0 short block