TheDreamSICKle

Hello Guy's

New member here and I have a question. I done almost everything to my truck(paint,suspension,interior,audio,ext..) and I think it is time to "wake up my motor.

99' GMC Sierra (The DreamSICKle)
4.8 V8 Daily Driver
pretty much stock (cold air, flowmaster)

Here's the question: Would a pair of ls1 heads be worth putting on a 4.8???
What kind of gains can I expect?
I have been seriously thinking about some CNC'd LS1 heads with a bump stick and a tune of course!

I need something to settle my nerves until I do what I really should do: 402 with forced induction.
Marcus

tdrumm

iTrader: (18)

Stick with the 4.8 heads. LS1 heads have a larger combustion chamber, and if you put them on a 4.8, you'll lose compression and power.

BeefTip

yeah, i would keep your stock heads. I assume they are the same as the 5.3 but im not sure. Get a nice cam, converter and clean your heads up and it should be good. Or you could drop a 6.0 w/a cam in it for not much more once you sell the 4.8.

tdrumm

iTrader: (18)

4.8 heads are the sam as 5.3 heads.

TURBHOE

iTrader: (4)

i put ls1 heads on mine and it didn't seem to hurt anything but i use the tiny felpro gaskets. between tune and heads and the ls6valve springs my top end came alive a little more but i put the heads on couse i'm going turbo.

01Blackerado

iTrader: (4)

Yeah LS1 heads will flow more!! but they drop compression. If you plan on doing some forced induction then these will come in handy. If you want to go NA then stick with your heads and get em ported an polished.

TheDreamSICKle

Thanks for the info fellas

ridnlow

iTrader: (5)

The tunes are the 99 year model trucks are horrible.. I would get an 02 pcm and let someone tune it..