5.7L Vortec Mods
#21
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Originally Posted by MCDiver
I have looked into new manifolds for the vortec engines on the 97-98 (99 on Tahoes) and have come up with nothing. The Thorley Tri-y's are the only non-short tube headers I can find. This has not been a fun process. Most of what I am doing will be internal mods. The sad thing is that with all of these motores on the street, the aftermarket will not make parts for us.
Mike
Mike
Hooker makes long-tubes for our trucks. Check out pacificp, a few guys have em. The only options are carbed intakes (either using a carb or converting to efi and lots of wiring) or marine manifold (everything pretty much bolts up but lots of wiring still and fuel lines)
#22
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Marine Intake
http://www.pacificp.com/forum/viewtopic.php?t=317
Hooker Longtube headers
These are the 2805 HKR $400 painted, $750 ceramic coated equa; l;ength 1 3/4" primary 3"c ollector Hooker Super Competition longtubes.
http://www.pacificp.com/forum/viewtopic.php?t=2415
http://www.pacificp.com/forum/viewto...oker+longtubes
I am running the $180 painted $350 ceramic coated and $540 stainles steel
1 5/8" primary non-equal length 2 1/2" collectors pn 2462 HKR.
With a mild Fastchips PCM tune and teh headers I dropped 3/4's of a second in the 1/4 mile.
ghere is some furthur info on installing ANY header into a 1996-2002 Vortec 350/305 vehicle.
http://www.pacificp.com/forum/viewto...+fitting#14630
here is the Pacific Performace Engineeriong Performance Truck site
http://www.pacificp.com/forum/index.php
peace
Hog
http://www.pacificp.com/forum/viewtopic.php?t=317
Hooker Longtube headers
These are the 2805 HKR $400 painted, $750 ceramic coated equa; l;ength 1 3/4" primary 3"c ollector Hooker Super Competition longtubes.
http://www.pacificp.com/forum/viewtopic.php?t=2415
http://www.pacificp.com/forum/viewto...oker+longtubes
I am running the $180 painted $350 ceramic coated and $540 stainles steel
1 5/8" primary non-equal length 2 1/2" collectors pn 2462 HKR.
With a mild Fastchips PCM tune and teh headers I dropped 3/4's of a second in the 1/4 mile.
ghere is some furthur info on installing ANY header into a 1996-2002 Vortec 350/305 vehicle.
http://www.pacificp.com/forum/viewto...+fitting#14630
here is the Pacific Performace Engineeriong Performance Truck site
http://www.pacificp.com/forum/index.php
peace
Hog
#25
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What about the RamJet manifold? I would assume that its a similar process to get that working instead of the marine manifold. I would also think that its worth a few ponies over the marine as well. The only difference would be setting up an intake to work with the manifold, because obv. the throttle body is in a different location.
Hog, what do you think of the RamJet in comparison to the Marine? I am planning the RamJet swap for this may.
-Rob Nap
Hog, what do you think of the RamJet in comparison to the Marine? I am planning the RamJet swap for this may.
-Rob Nap
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The Ramjet is probably worth a few hp as it is more of a tunnel ram intake while the Marine intake is a cross Ram setup.
The Ramjet forces sthe intake air to tun 90° the Marine intajke doesnt due to its TB position.
I would love to see a dyno sheet comparing the 2.
The Ramjet install would be a tad more involved, but could be done nonethe less.
peace
Hog
The Ramjet forces sthe intake air to tun 90° the Marine intajke doesnt due to its TB position.
I would love to see a dyno sheet comparing the 2.
The Ramjet install would be a tad more involved, but could be done nonethe less.
peace
Hog
#28
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my buddy had a 98 silverado with the vortech 350 and it had hooker long tube headers k&n cold air intake crane cam 210/224 @.50 powermax truck cam, crane powermax tuner, 3:73 gears, shift kit, and a throttle body spacer and he ran consistent 8.60's in 1/8mile hope that helps some!
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