marine02ss

iTrader: (3)

I hve a 408ci that I barely fired up 2 weeks or so,car is running strong.I would like to upgrade my HLT 1 3/4" to either edelbrocks stepped headers or straight 1 7/8" of somekind.Which would I benefit more from,would I loose alot of low end torque.Just looking for better performance out of diffrent headers.

Pimpium57

iTrader: (104)

The stepped ones will benefit you more in the low-mid range while the straight 7/8"s will give you better top end (either one isn't to make a huge, dractic change over the other). I personally wouldn't worry about a slight loss of low end in a 408. So, IMHO, go 1 7/8".

blue01ta

iTrader: (4)

Yeah 1 7/8" QTP's.

ArcticZ28

iTrader: (14)

I would worry about low-end loss if you drive in the city a lot with a big cam with a narrow LSA. The cam's gonna have a lot of overlap and be a dog in the city at lower rpm's, not to mention the 3.42's along with a loss in low end torque. It might not be enough to matter to you, but with the 90/90 you're running now and a good set of heads, your top end will be more than fine with the stepped LT's. It's a give and take, just my personl experience.

383ss

iTrader: (14)

I lost 20rwtq going to 1 7/8's and started picking up hp at 5000. it did draw my rpm band out about another 500rpm up top. PEAK gain was only 5hp.

JakeFusion

iTrader: (7)

What did you move from? Stepped headers or 1-3/4?

Drew778

iTrader: (2)

What headers did you have before and what do you have now?

383ss

iTrader: (14)

i went from Dynatech 1 3/4 to QTP 1 7/8th.

ArcticZ28

iTrader: (14)

That explains it, 1 7/8 all the way are def going to rob you of low end tq. IMO the 1 3/4 stepped to 1 7/8 are the best way to balance the two with bigger cubes.

Ωmega

iTrader: (28)

I agree, it's a nice comprimise between the two.