i was looking around the other day and found a set of headers on ebay... i dont know how good they are or anything but do any of you guys know about them?

Very Long eBay link

im gona do basically a tru dual setup on my blazer and have an H pipe in the middle to balance it out pretty well. also im gona use either 30 or 40 series flows on italso how do i tell if i have air injection on it? ive never really messed with my blazer yet so im not clued in on wat to look for


*EDIT by swartlkk* - fixed long link

 

It's your choice, Mike, but as has been discussed here before, dual exhaust on a Blazer 4.3L really does not give you much return in performance and can actually decrease power in a lot of cases. The engine is designed to operate at a certain level of exhaust back pressure and duals will usually take away low end torque and hp, but might add a very small amount of upper rpm performance. Soundwise, the exhaust note will perhaps be louder than a single, but it will never give the wonderful rumble you would get from a V8. The above reasons reflect why almost no V8's in modern design cars come with true duals like the old cars did.

 

true. i just started thinking about it just yesterday so i dont have anything set. i see your point about duals... i guess i just should have said i wanted the dual outlets because im just not a fan of a single tip. ty for your input though... im also gona get my pcm done by pcm for less. in a few weeks i hope. depends on when i get my other turbo project car done.

 

Sounds like a plan to me. The only trick you might encounter with the dual outlet is, if you have a four door with the underbody spare tire it can be tricky getting that outlet routed in a sane manner around it.

 

dont gota worry bout that here. i have a 2dr. only thing i have ever worried about on my blazer is the motor mounts... because i am on my third set and the are not in good shape on the drivers side

 

Hey mmench are you the same guy that has an 06 monte carlo from another forum?

 

no sir. im on this forum ..... srtforums.com... and dodgeforum.com. dont have any monte carlo's anymore. somebody else got my name or something?

 

i have a 94 with headers and a x-pipe with glass packs on it and an intake. it made a huge difference but when you do it you should polish the exhaust ports for maximum performance.
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Yea on the monte carlo forum someone has your name...LOL.

 

A big mistake isoften made with a small displacement engines such as a Chevy V6 4.3L engine when the exhaust flow is increased and the exhaust back-pressure reduced .Small displacement engines must have abalanced intake to exhaust flowto prevent the combustion chambers from being over-scavenged. Over-scavenging the combustion chambers is when back-pressue has been reduced in the exhaust system to the pointthat the outgoing exhaust pulses draw a portionof the incoming fuel-air mixture out of the combustion chambers withthem. That is becausebecausevalve timing must allowboth valves to be open at the same time for a fewdegrees of crank rotation.That is called "valve overlap" which aids in pulling the fuel-air mixture into the combustion chambers.Eliminating too much of the back-pressure in the exhaust system will decrease engine torquewith an increase in high RPMhorsepower. However, what performance you gain withmore top-end horsepower is lessthan what you lost inlow-end torque. Torque is what moves a vehicle, not horsepower. The 4.3L V6 engine and stock exhaust system isoptimum as is. An unrestrictedexhaust system on a 4.3L engineis only for sound and appearance . This even applies to larger V8 engines to a certain extent, but a V8 has torque to spare and mayhave a overall performance gain withhigher top-end horsepower withthe correct final drive gear ratio.

Example: Remove the exhaust pipe expansion chamber and the 1/2" diameter exhaust tip froma 100 CC dirt-bike and you cannot even get it to untrack!