Everyone keeps dissrespecting 4.8s,I'd like to pose a couple of questions.If the pistons are the same bore and the piston tops are flat vs. dished in a 5.3 and the rods are the same.Will a 5.3 crank work with the 4.8 rods and pistons without hitting the head?Talk about a cheap high compression build up.You could have a 5.3 liter motor with factory high compression for the cost of a crank kit.Has anyone done the research to see if the parts will work?

 

that's a good question..

nitrous likes high compression, and i like nitrous.. hrmm

How but a 5.3 with 4.8 pistons? I didnt know the pistons were diff.

 

I would need to know the compresson height of the piston and the rod length of the two diff motors. The stroke of the 5.3 is .354 inches longer which is about 3/8" longer. So without knowing the comp height and the length of the rod, its hard to tell.

After rereading your post, it would not work if you used the 4.8 rods as they are longer, therefore sticking the piston out of the hole 3/8" for just the crank swap and however much more the 4.8 rods are longer also.

 

They have the same pistons the stroke is the only difference and the rods make up for it not the pistons.


go to http://www.mortec.com/borstrok.htm

 

They don't have the same pistons, the 4.8 has a flat top, and the 5.3 has a dish. The compression height will probably be different too.

 

what about a 5.3 with 4.8 pistons?

 

are you sure? I thought nitrous likes more cc to expand when exploded which makes more power?

 

i read in the n2o forums that high CR breaks down nitrous faster or somthing

 

this is what i got from sshotrods, john:

"Nitrous reacts to the gas in the cylinder to give it more surface area. The greater surface area makes the fuel burn faster. This gives your motor a big power gain but creates more stress on the motor"

sounds like it likes more area, or more cc in the chamber. sorta like throwing more gas on the flame.

 

I worked on this on the way home. What could be done is a high revving short stroke motor with a large crown best for n2o. You would take a 4.8/5.3 block, 4.8 crank, 5.3 rods, and a custom piston. Actually it would probably be a very heavy piston since the crown would have to be very thick due to the length of the 5.3 rod. So in reality that really isn't feasible either due to weight. Its possible but it would cost a little more.