Hemi engine work

ckruzer

ckruzer

Infidel
Joined
Jul 2, 2015
Location
asheville nc
Looking for referral to a reputable shop. Looking to cam swap with lifters and springs. Maybe shorties as well

Hemi 5.7 4th gen
 
I'd definitely do long tubes if they'll fit...otherwise, I'd probably just stay with stock manifolds unless you just don't have any.
 
Croatan_Kid said:
I'd definitely do long tubes if they'll fit...otherwise, I'd probably just stay with stock manifolds unless you just don't have any.
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I dont know if long tubes will fit. Ive heard from quite a few sources that shorties imrove mgp a little and give more hp/torque. The main thing is to correct the manifold bolt issue before its an issue, and while in there, why not toss 200 bones at an improvement?
 
Maybe they help on a Hemi, but they don't on an LS.
 
ckruzer said:
I dont know if long tubes will fit. Ive heard from quite a few sources that shorties imrove mgp a little and give more hp/torque. The main thing is to correct the manifold bolt issue before its an issue, and while in there, why not toss 200 bones at an improvement?
Click to expand...
Why not?
They are louder - that can be a pro or a con dependent on your view
They (typically) radiate more heat which can reduce the life of nearby components
They wont last as long as a manifold...

My experience only YMMV
 
As far as headers go, the factory didn't just design for mpg and emissions but also performance. The design they ship with is the best compromise between emissions (first and foremost- must meet or it's not produced), performance(assuming class mpg are met, this is 2nd), and mileage (this is second to performance, but not second, depending on application. If minimum requirements are met and it's not a vehicle made for mileage z performance dominates mileage for most of the design). The OEM spent a great deal of time designing the OE components to work the best they could possibly in a given application. Enginerds aren't always the bad guys. Do consider, majority is electronically modeled, compared to in late 80's early 90's when designers got to actually go to the fab shop and request x y z made a b c and get to try it out and play experimentally.. (not that not having that is a inherently a "bad thing"[TM]; reduced cost, less lost time, etc, but less fun for the real tinkerers employed, though I'm sure their numbers had drastically improved in both time spent designing and in desired target numbers)

Consider also, the header designers didn't have all the information that the OEM did when designing the headers.. unless you're making other changes to the intake tract/head/valves, you may actually lose performance by going to a header because you are changing parameters that perhaps, say exhaust scavenging, or exhaust resonance may play into in the OE design.

Just my $1.99. enough to at least get you a bottle water or soft drink. I'm not so cheap as to only give my 2¢.
 
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