6.0 5.7 5.3 4.8
 

im planning on removing my stock 4.8 aluminum heads
i need info on opinions on should i rework my stock heads or buy 6.0 5.7 or 5.3 heads and what combo should i use i dont want n.o.s. or forced induction so all opinions will be greatly apprecatied... :hump:

Re: 6.0 5.7 5.3 4.8
 

6.0 have the best flow #'s, from what I have been told.

Re: 6.0 5.7 5.3 4.8
 

actually the 4.8/5.3 heads are the same and are a very good head. all the other heads have bigger cc chambers and would drop your compression.61cc 4.8/5.3 64cc 5.7ls-6 67cc 5.7ls1 71cc6.0. go w/ 4.8/5.3 heads have them cnc'ed. you can't go any bigger than 2.00" intake w/the 4.8/5.3L bore. have the chambers reduced to around 58cc to bring you up to around 10:1 compression. then add a cam that will take advantage of the increased flow but be careful of your .050" duration #'s too big and you'll kill any of the low end the 4.8 has.

Re: 6.0 5.7 5.3 4.8
 

I know that with 5.3 heads if you get them reworked you can get up to 12:1 compression I believe, and will work with 93 octane. Not completely positive but pretty sure. :drive:

Re: 6.0 5.7 5.3 4.8
 

The thing to do is put the 4.8/5.3 heads, with some port work, on a 5.7 for the bump in compression. That tells me that the 4.8/5.3 heads are good flowing heads. Have the heads worked over by some one that knows what they are doing.

Re: 6.0 5.7 5.3 4.8
 

Flem has some excellent advice on this. Bumping up the compression is a good idea for a n/a motor.They make 2 6.0 motors. The only difference is the compression. One makes 9.5:1 and the other makes 10.5:1 and claims 340 HP.

Re: 6.0 5.7 5.3 4.8
 

4.8/5.3/5.7 heads are the same. The diff is the combustion chamber between the 4.8/5.3 and 5.7 (LS1 heads)

LS6 and 6.0 heads are the same also with the difference being the chamber also (same "D" port exhaust).

Re: 6.0 5.7 5.3 4.8
 

minor difference...but it's 9.4:1 NOT 9.5:1 and 10.5:1 for the LQ4 and LQ9 6.0 liters...I have been told the difference is in the head gasket...and I have a hard time believeing that 45 HP is gained by a head gasket change.....I am assuming there is a cam change as well ??

Re: 6.0 5.7 5.3 4.8
 

Yelo - Same head gasket in the different 6 Liters. Same cam in the LQ4 and LQ9. The LQ4 has cast dished pistons for 9.4:1! and the LQ9 has hypereutectic flat top pistons for 10:1 compression. The 45 HP rating is due to the increased compression and better tuning.

Re: 6.0 5.7 5.3 4.8
 

thanks for the correction and the info.....I thought the head gasket thing sounded a little fishy