tim burks

has anyone tried the difference in primary tubes o a n/a 6.0 build? I figure the 1 7/8 may give me more peak but be down in the mid rpm compaired to the 1 3/4. just trying to get the right parts the first time ya know.

6secNaLs1

iTrader: (5)

I tested on a 346 fuel inj.. the 7/8 made 10 more everywhere ..back to back dyno

ZONES89RS

iTrader: (25)

F you have a Y pipe I would say 1 3/4 is fine. But dual with a X pipe is begging for 7/8.

Doug G

1⅞" here and don't feel any problems down low.

Even just cruising.... couldn't tell.

tim burks

found a set of 1 3/4 to 1 7/8 stepped header, should be better right?

ZONES89RS

iTrader: (25)

Better than 1 3/4 full.

tim burks

I have a choice between the 1 3/4 to 1 7/8 stepped header or just 1 7/8 primary header. 100 bucks difference in price. with a 4000 stall do yall think its worth running the stepped primary tubes? I know a stepped header will help down low, but with that stall would I be above the rpm range of where the stepped header is beneficial?

fast89stang

iTrader: (2)

Mine are straight 1 7/8, and I dont think im lacking anything down low. LOL

tim burks

Thanks Fast, looks like ill pay the man today

LivernoisMotorsports

iTrader: (1)

A step header is a win almost every time! If you have a big power adder not anything your going to notice, but on an all motor car a step and a good collector make all the difference in the world.

tim burks

thanks for the info, id just like to know where the step header makes its power down low, if its below where my converter locks up then I don't see any gain in my application. but ive been wrong before.

TXsilverado

iTrader: (18)

I went from a 1 3/4 through a single 3" exhaust to a 1 7/8 header with dual 3" and gained huge down low on a N/A HCI LS1. gains up top weren't as impressive.

thirdgenbum

iTrader: (17)

huh? explain.

VLS1

That is everything to do with going from a restrictive 3" single pipe to a twin system, albeit probably overkill for the application and could have been better all round with a more appropriate system.

tim burks

I bought the 1 3/4 to 1 7/8 step with a 3 inch collector. everywhere I read says the step design is better than a straight tube, plus can help in the lower rpm, and since its a street car I didn't want to leave anything out. id almost bet I cant tell any difference in this header and a 1 7/8 design but if theres a few extra ponies in them and I find a few extra elsewhere then they'll start adding up. looking for that 10.99 or quicker next spring!

ZONES89RS

iTrader: (25)

I just give the larger headers the larger exhaust if it is 1 7/8 or above and the engine needs it. Seen some go from a real nice Y to duals and not pick up much compared to the 1 7/8. Never had a back to back 1 3/4-1 7/8 and Y to dual comparrison on the same vehicle though, just what I have seen first hand on different setups.

TXsilverado

iTrader: (18)

so critical of everyone's setup without knowing all the details

speedtigger

iTrader: (16)

If I still had a tig welder, I would fab some custom 1 7/8 headers with a good collector for an experiment.

thirdgenbum

iTrader: (17)

i want to build a set for mine. 1 7/8"-2" stepped primary to 3.5" merge collector.

ZONES89RS

iTrader: (25)

Lol, that would probably make a 9 second slip easy for you.