Cheyenne95

What headers should I go with I considered shorties but I'm gonna end up going long tube 427 dart 224/230 cam on a 114 with afr 245s and 10:2:1 compression the trucks on 35s with stock 4.10s at the moment I'm looking at 1 and 3/4s but would the 1 7/8s help the bigger ci breathe better or what?

wretched73

iTrader: (1)

Bigger is better. Especially when you're dealing with big cubes.

ARH makes 2", that would be my choice

BigKID

iTrader: (5)

The cam is small for the engine combo so will probably run out of breath on the top end where the 1-7/8 would shine over 1-3/4. It is not a max effort setup so get which ever are available or meet your budget as they will both perform about the same on that combo, IMO.

_zebra

iTrader: (5)

i'm a little torn between the suggestion above & saying just get the 1 7/8" so you have room to upgrade in the future.
either way, shorties are basically worthless on an LS build because the OEM manifolds flow almost as well for a fraction of the cost.

wretched73

iTrader: (1)

You guys are blowing my mind.

Stock LS3s pick up power with a 2" over a 1 7/8"

tjmath

That was my thought as well.

I have 1 7/8's on my 5.3 and they are great. Going on a 427 I would definitely go 2" primaries.

_zebra

iTrader: (5)

considering my blown LS1 (8L equivalent displacement) flows plenty good on 1 7/8", i don't think going full-hog on 2" is really necessary.
i do agree that 1 3/4" would choke the top end, but for a truck on 35s with only 4.10s, how much high-RPM driving will it really see to take actual advantage of the extra size? remember, everything has trade-offs, and the larger primaries (a lot more $$, especially for 2") would give up more off-idle grunt, which is what that little cam seems to focus on.

those're just my thoughts on it.

_zebra

iTrader: (5)

will 2" read higher on the dyno? absolutely, so if he's chasing a peak power number: get 2"

what's his budget? if he's working with peanuts, 1 3/4" will get him by but leave a lot on the table while still providing excellent off-idle torque. granted i ain't priced headers in about 10yrs, but i know the 2" were LOTs more cash than 1 7/8 at the time & weren't worth it in my particular case for a couple extra ponies in addition to moving my power band farther up.

Cheyenne95

My cam is a mild one, I basically have to pass a 2 speed sniffer which is idle and at 2500rpm that's it no visual I'm sure I could get away with a bigger cam but It's basically a 2500 stall with a shift kit so it's more of a low rpm to mid range motor anyway

_zebra

iTrader: (5)

mild for sure: i was running a 219/224 115° in my 5.3 (102ci less), and it was relatively tame.
my car's got a 231/248 120° with 346ci