that would be one ROUDY *** 4.8, would love to see those results! i myself love the little engine that could but im considering a 6.0 build and then ill put the 4.8 in my little s10 DD.

 

4.8 862 heads 61.15cc milled .025 now around 57.78cc ported and polish, 2 angles valve job 225/229 581/591 114 patriot cam and springs,its another engine now.tune the pcm use those rpm's,mine 6500 wow. Not a shot from the hole,but i'll make you smile and others cry.

 

Newer 07 and up 4.8's do not have higher compression than the 99-07 4.8 motors. GM dropped the cr from 9.5 to 9.1

 

i have a 2007 nnbs wt cc w/4.8 and 243s,and the compression on this motor is 9.4.and i would love to put that tsp cam in it.

 

it's very important to use a higher axel like 3.73 or 4.10 and stall,you will loose torque from down low, that's why a higher axel and stall. Remember these 4.8 loves rpm's a good tune will let you spin this little. I'm not sure the chamber cc of 243 heads, my 2000 4.8 silv,has 61cc heads I milled .025 now 57cc port and polish 2 angle valve job, the sound change dramatically and the exaust don't lie. 3" exaust, headers, remember this, Dr. Jeckill and Mr. Hide!!! that's how your truck will behave.

Do it and enjoy!! the compression now 10.49:1 , 93 octane gas runs perfect,in a 26 gallon tank 1 gal of c12
gas just for play. umm love the smell of kick ***!!