jg53

iTrader: (10)

so I have a spare bare NNBS intake manifold laying around.

Ive always thought I would sell it when the time comes to get a little extra funds when im ready to throw the procharger on.

but

now I am contemplating on sending it off and getting it ported.

The only reason Ive not done that is because I dont know if I should just leave well enough alone with the blower/cam/tranny combo. And for the fact that Ive seen that it can cost a pretty penny.

Has anyone done this and seen some gains with the ported manifold?

If i do send it off to get ported, im sure im going to get the TB P&P'd as well.

jg53

iTrader: (10)

anybody? I know that nick, m3srt, has done the swap but I havent heard any numbers or prices. worth the money?

Mangled03gmc

iTrader: (95)

So if it is the 87mm opening it is worth the swap. 15+hp, tq across the board..

jg53

iTrader: (10)

I didnt realize it was that much. Thanks John! Im going to have to dig a little deeper into this now!

1slow01Z71

iTrader: (36)

John is thinking about going from the stock truck intake to the NNBS intake. LS2 port works does a lot of intake porting, check with them. At one time there were some dyno charts posted but I dont know of any with results from porting on the truck intakes.

Mangled03gmc

iTrader: (95)

Isn't the NNBS truck intakes that are not the classics(99-07c) the ones with the 87mm opening?? Same as the TBSS intake?? Now you got me confused. I am thinking that being ported would show even more gains, but somebody posted a vid in one of my threads about them(TBSS) intake, it showed all kind of flexing, but not sure who and how it was ported..

Preston129

iTrader: (3)

I'm almost willing to bet money the NNBS have a 90mm opening, part of the reason I added a 90mm TB.

I think some people have removed the stanchions inside the intake thinking it would benefit flow patterns but all it did was weaken it.

Mangled03gmc

iTrader: (95)

Only thought the car ls2 had the 90, while the truck and tbss still kept the 87..

Preston129

iTrader: (3)

I'll have my TB off within the next week so I'll measure with a set of calipers.

jg53

iTrader: (10)

yes John is it the 87mm intake.

and thanks Cody, I will check out LS2 port and see what they offer.