L92 header question
L92 header question I want to get a set of 1 7/8 headers from kooks for my L92 in the works. Question is Do I need D port flanges or can I use regular LS1 style flanged headers? Saw a couple used set on here and was wondering how they would work or if they would effect performance because of not being the D port?
Thanks,
Nick
Thanks,
Nick
Regular headers work I'm going to use my Dynamaxx's for my L92 heads. LS6's also have "D" exhaust ports. I'm not aware of specific "D" port headers?
Some people got with 1 7/8 primaries, but I'm going to wait to get new headers.
Bob K.
Some people got with 1 7/8 primaries, but I'm going to wait to get new headers.
Bob K.
I was looking at Pace Setter 1 3/4 Headers just to keep it with a little bit of Back Pressure in the Exhaust, I was going to run from there a X-pipe, and then into 2 Bullets dumped infront of the Rear Axle, all 3" setup.
I'm running American Racing LT's w/ a round flange on mine. CNC'ing makes the port rounder anyways.
Before and after L92 pics of the WCCH Stage 2 heads.
Before and after L92 pics of the WCCH Stage 2 heads.
Last edited by WKMCD; Apr 9, 2007 at 11:43 AM.
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Originally Posted by jtl12419
For the best effect of the D-port on the cylinder head, you DO NOT, DO NOT want D-port on the matching exhaust face. Round is best,
Id like to see an ls1 exhaust manifold gasket held up to those cnc'd heads to see what it looks like, Im sure somebody has a set not on their engine yet 
Makes sense if the round port 1 7/8 header is bigger then the the D port why you would want to use that one.
Makes sense if the round port 1 7/8 header is bigger then the the D port why you would want to use that one. 
Originally Posted by jtl12419
For the best effect of the D-port on the cylinder head, you DO NOT, DO NOT want D-port on the matching exhaust face. Round is best,
D-porting of the exhaust port is one of the key developments in latest head design.
"The "D" shaped exhaust port is designed to provide a larger area for increased flow and velocity as well as to create a mismatch between the exhaust pipe and the exhaust exit. This purpose-built mismatch reduces "power-robbing" reversion by keeping the majority of the exhaust gasses from going back into the engine."
Keeping the port and exhaust shape/size mismatch actually increases the flow/velocity of exhaust gas pass the port.
That's why you do not want to match the port with the exhaust. You cetainly dont want to lose the benefits of the D-port port by matching the shape of the header to the hole.
"The "D" shaped exhaust port is designed to provide a larger area for increased flow and velocity as well as to create a mismatch between the exhaust pipe and the exhaust exit. This purpose-built mismatch reduces "power-robbing" reversion by keeping the majority of the exhaust gasses from going back into the engine."
Keeping the port and exhaust shape/size mismatch actually increases the flow/velocity of exhaust gas pass the port.
That's why you do not want to match the port with the exhaust. You cetainly dont want to lose the benefits of the D-port port by matching the shape of the header to the hole.
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Originally Posted by jtl12419
D-porting of the exhaust port is one of the key developments in latest head design.
"The "D" shaped exhaust port is designed to provide a larger area for increased flow and velocity as well as to create a mismatch between the exhaust pipe and the exhaust exit. This purpose-built mismatch reduces "power-robbing" reversion by keeping the majority of the exhaust gasses from going back into the engine."
Keeping the port and exhaust shape/size mismatch actually increases the flow/velocity of exhaust gas pass the port.
That's why you do not want to match the port with the exhaust. You cetainly dont want to lose the benefits of the D-port port by matching the shape of the header to the hole.
"The "D" shaped exhaust port is designed to provide a larger area for increased flow and velocity as well as to create a mismatch between the exhaust pipe and the exhaust exit. This purpose-built mismatch reduces "power-robbing" reversion by keeping the majority of the exhaust gasses from going back into the engine."
Keeping the port and exhaust shape/size mismatch actually increases the flow/velocity of exhaust gas pass the port.
That's why you do not want to match the port with the exhaust. You cetainly dont want to lose the benefits of the D-port port by matching the shape of the header to the hole.
