Dorman intake manifold

Dorman intake manifold DEFAULT

615-181 Dorman Intake Manifold

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Engine Intake Manifold Lower Dorman 615-285

Engine Intake Manifold Lower Dorman 615-285

Engine Intake Manifold Lower Dorman 615-285
Engine Intake Manifold Lower Dorman 615-285
Engine Intake Manifold Lower Dorman 615-285

Engine Intake Manifold Lower Dorman 615-285

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By Richard Holdener/Photos By Author

Available for all these years — can any LS intake beat the FAST?

The internet is great for a number of things, not the least of which is spreading rumors. The information superhighway is certainly king when it comes to getting info out to a vast audience, but therein lies the problem. As efficient as it is at getting info to millions of people almost instantly, it is somewhat less efficient at ensuring the accuracy of said info! Whether that information is biographical, political, or extraterrestrial matters not; people love a good story.

Naturally, this simple fact of human nature carries over to the automotive world. Case in point, the introduction of the Dorman composite LS2 intake. Car guys will recognize Dorman as a supplier of a great many items that help us fix things, but they also offer replacement intake manifolds for a number of applications, including the ever-popular LS engine family. In fact, they offer no less than three different intakes for the LS, one designed to replace the TBSS, one for the LS6, and, the one we tested here, designed for the LS2.

While the information about the availability of the Dorman intake is nice and all, where is the conspiracy we want? Well, the word on the street is that the Dorman LS2 intake (pt#615-901) is actually less of a direct copy of the factory LS2 as it is a hybrid of sorts. The internet rumblings seem to suggest the Dorman intake appears to have taken design cues from not only the factory LS2 intake, but also the original FAST manifold. Obviously, none of this information has ever been substantiated (or the question even posed to the folks at Dorman), but a good conspiracy theory needs no facts. In fact, much like Big Foot and the Loch Ness Monster, it is often much better without them.

The great thing about the conspiracy theory is that it leads to a number of ancillary questions, the kind that can only be answered on the dyno. If the Dorman manifold is indeed an improvement over the original LS2 (an easy job given the LS2 is only marginally better than the LS1), could it actually be better than original FAST? I mean come on, it does have a larger throttle opening!

To find out, we set up some good old-fashioned, intake-on-intake action to compare the two manifolds. Actually, we ran three manifolds, as, like any good one, the conspiracy theory was not super specific about which FAST intake the design cues were lifted from (obviously, if at all).

The test was run on a 5.3L that came from the same source of all great test motors, our local LKQ wrecking yard! Rather than run the truck motor in stock trim, we made a few upgrades prior to the test. The high-mileage 5.3L LM7 was first treated to a cam upgrade in the form of a 54-454-11 grind from COMP Cams. The healthy hydraulic roller cam offered .614./.624 lift split, a 227/243-degree duration split, and 113-degree lsa. The cam was teamed with the necessary 26918 valve-spring upgrade to ensure both coil bind clearance and plenty of RPM potential. The test mule also received long-tube headers, 89-lb FASTinjectors, and a FAST XFI management system. All three of the intakes were run with the same air/fuel and timing curves.

To get things started, we installed the Dorman LS2 intake with a FAST 92mm throttle body. The intake also required the use of different 83-lb injectors fed by a Wilson fuel rail. One thing we didn’t care for on the Dorman intake was the lack of threaded inserts to secure the fuel rails. The kit came with self-tapping screws, but in its defense, the Dorman was priced much more affordably than the FAST.

Equipped with the Dorman and tuned to perfection, the modified 5.3L produced 465.5 HP at 6,600 RPM and 412.5 lb-ft of torque at 5,300 RPM. We then replaced the Dorman with an original FAST/Wilson intake that featured the minuscule 78mm throttle opening. The OG FAST was run with the same injectors, but a much smaller 78mm Accufab throttle body. Despite the handicap in throttle body size, the FAST intake produced 471.7 HP at the same 6,600 RPM and 413.7 lb-ft of torque at 4,900 RPM.

Obviously, the FAST held its own against the Dorman, but just to be sure, we threw the big-boy, 102mm LSXRT intake in the mix. Run with the LSXRT, the 5.3L produced 479.2 HP at 6,800 RPM and 421.6 lb-ft of torque at 4,900 RPM. The big FAST offered more peak horsepower and torque, but is the power difference enough to guard the door when it comes to cost?

Graph 1

Graph 1: 5.3L Intake Test-Original FAST vs Dorman LS2

The talk around the shop (meaning the internet) is that the Dorman LS2 intake might have taken design elements from both the factory LS2 and FAST intake. Tested against the original FAST/Wilson intake, the Dorman did well, but couldn’t quite match the original in terms of peak power. The modified 5.3L produced 465 HP and 412 lb-ft of torque with the 90mm Dorman, but these numbers increased slightly to 471 HP and 413 lb-ft with the 78mm FAST.

Graph 2

Graph 2: 5.3L Intake Test-FAST LSXRT vs Dorman LS2

Despite the fact the original FAST held up the family honor, we decided to check out how the FAST LSXRT compared to the new Dorman. Unlike the original FAST, the LSXRT featured a 102mm throttle opening and throttle body, but the intake design itself was different, as well. Where the Dorman LS2 produced 465 HP and 412 lb-ft of torque, the LSXRT stepped things up to 479 HP and 421 lb-ft of torque. The modern FAST not only offered more horsepower but more peak torque as well.

Equipped with the FAST LSXRT intake and Big Mouth throttle body, the 5.3L produced 479.2 HP at 6,800 RPM and 421.6 lb-ft of torque at 4,900 RPM.
Equipped with the FAST LSXRT intake and Big Mouth throttle body, the 5.3L produced 479.2 HP at 6,800 RPM and 421.6 lb-ft of torque at 4,900 RPM.


$79.99 eBay Dorman LS 4.8 5.3 6.0 truck intake manifold. Inspection and Review

new style Engine Intake Manifold Dorman 615-465 online shopping and fashion store

new style Engine Intake Manifold Dorman 615-465 online shopping and fashion store

the first symptom of a cold is usually a sore throat. this is generally followed by sneezing or a blocked, sore or runny nose. usually, 1 in 3 people with a cold will get a cough and feel unwell.

colds are caused by viruses. antibiotics cannot treat viruses. instead, drink plenty of liquids to replace those lost from sweating and runny noses. get lots of rest and eat healthily. do not ask your gp for antibiotics for a cold.

you will usually feel worse during the first 2 to 3 days before gradually starting to improve. your symptoms will usually last about a week.

cold and flu symptoms are similar but flu tends to be more severe.


  • appears gradually
  • affects mainly your nose and throat
  • makes you feel unwell but you're ok to carry on as normal - for example, go to work


    new style Engine Intake Manifold Dorman 615-465 online shopping and fashion store
  • appears quickly within a few hours
  • affects more than just your nose and throat
  • makes you feel exhausted and too unwell to carry on as normal

cold symptoms can include:

  • blocked or runny nose
  • sore throat
  • headaches
  • muscle aches
  • coughs
  • sneezing
  • a raised temperature
  • pressure in your ears and face
  • loss of taste and smell

the symptoms are the same in adults and children. sometimes, symptoms last longer in children.

causes of colds

colds are caused by viruses. they can easily spread to other people. you're infectious until all your symptoms have gone. this usually takes about a week.

colds are spread by germs from coughs and sneezes which can live on hands and surfaces for 24 hours.

to reduce the risk of spreading a cold you should:

  • wash your hands often with warm water and soap
  • cough into your elbow to stop germs getting on to your hands and spreading to other people
  • use tissues to trap germs when you cough or sneeze
  • bin used tissues as quickly as possible

how to prevent catching a cold

the best ways to avoid catching a cold are:

  • washing your hands with warm water and soap, especially before eating
  • not sharing towels or household items, like cups, with someone who has a cold
  • not touching your eyes or nose. you can infect your body if you've come into contact with the virus.
  • staying fit and healthy

Manifold dorman intake


LS Tech: Porting the Dorman LS2 Intake Manifold


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