V-8 headers/dual exhaust

V-8 headers/dual exhaust

Postby generaljake01 [OP] » March 23rd 2009, 11:21pm

Question...every one seems to be recommending using HEDMAN headers #HED68600 as far as using headers for the v-8 swap. I went to Summithttp://store.summitracing.com/partdetail.asp?autofilter=1&part=HED%2D68600&N=700+4294923429+4294839039+400143+115&autoview=sku and see they are $153 but the last set of hedmans i bought for my S-10 V-8 swap were crap...the flanges warped way too easy had one of the bends/elbows crack out and one spark plug was absolutely inaccessable,the only way to get a plug wire on it was to ding the back side of the header tube...anyway my thought is summit has a SUMMIT brand that is only $80 http://store.summitracing.com/partdetail.asp?part=SUM%2DG9001&view=1&N=700+150+4294923429+4294839039+4294918680+4294908216+400304+4294908194+4294840138+&appfilter=1and they seem to fit most all the same cars the hedmans do but at 1/2 the $$$ and also the flange is thicker ... im just not too sure bout getting full legnth headers under my van...Anyone use the full length headers???Any problems??? Im not trying to be a cheap-O but just trying to save some $$ if i can.plus im not too fond of the ball-socket connection of the hedmans and summit ones use the 3 bolt flange... :confused: Also these headers are shortys and have the O2 sensor fitting already installed...Summit SUM-G9005 :2:
'87 LT with TBI 305/700r4 3.42s---94 S-10 shorty w 350/TH350
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Re: V-8 headers/dual exhaust

Postby astro355 » March 23rd 2009, 11:52pm

I not positive on the part number but I have Hedmans on my van. I have had no problems with them.
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With the number 6 spark plug, I had to make a socket to get the plug on and off. Pretty much a normal spark plug socket just half as long. It makes it easier to plugs 5 and 8 also. I have never had a problem with the flange bending, overtightening maybe?

The big downside with those summit headers it that they don't flow as well. They are made more for access than for performance. The hedmans put performance over access which is why its hard to get to the plugs.

Where is the o2 fitting installed? Really, you can't install an o2 fitting in either header but only in a crossover pipe. That way, the o2 sensor is getting a reading from both sides of the engine, not just half.
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Re: V-8 headers/dual exhaust

Postby generaljake01 [OP] » March 24th 2009, 12:26am

Yeah i noticed right off that the flow wouldnt be the same...the collector on the one pair of summit headers is only 2 1/2" compared to the 3"of the hedmans...Image the fitting for the O2 is near the collector on driver side sorta hidden in the pic...
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Re: V-8 headers/dual exhaust

Postby generaljake01 [OP] » March 24th 2009, 12:29am

It seems in all my experiences that if I try to save a few $$ and cut corners that it ends up biting me in the backside... :obscene-hanged:
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Re: V-8 headers/dual exhaust

Postby Gary » March 24th 2009, 2:22am

While I admit it was long ago,I worked at the Chevy Tonn dyno rm and the brand of header that lasted the longest was hands down Headman.On the other hand,Hookers burnt out fairly quickly.
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Re: V-8 headers/dual exhaust

Postby astro355 » March 24th 2009, 2:28am

generaljake01 wrote:Yeah i noticed right off that the flow wouldnt be the same...the collector on the one pair of summit headers is only 2 1/2" compared to the 3"of the hedmans...[ http://store.summitracing.com/largeimage.asp?part=SUM-G9005&Prod=Summit+Performance%AE+Headers&img=sum-g9005_w.jpg ] the fitting for the O2 is near the collector on driver side sorta hidden in the pic...


If the o2 sensor is in just one header (and not a crossover pipe), you run the danger of running too lean or too rich. The o2 sensor needs to be in a position that it gets vapors from all 8 cylinders, not just 4.

generaljake01 wrote:It seems in all my experiences that if I try to save a few $$ and cut corners that it ends up biting me in the backside... :obscene-hanged:

Quoted for truth.
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Re: V-8 headers/dual exhaust

Postby Rinny » February 5th 2017, 8:30pm

There are 3 02 sensors on my 2003 van. one rite after each exhaust manifold and one rite in back of the cat. I think I will just put them in the same place or as close as I can, will that work? I am going to use the hedman 68608 headers with the 02 sensors in the 2.5 to 2.25 reducer. I am going to go stainless steel exhaust so I will have to weld in the bungs for the 02 sensors as I cannot find any ss with them in.
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