Its a wild 6 port bridgeport with a 650 Holley. I am going to install a butterfly valve on the 5/6 ports.



1984 GSL, 12A Tranny (for now) and LSD. Car is gutted out behind the seats.



The real trick is going to be figuring out how long the smaller pipe running inside the other needs to be.

Now that sounds like a pretty wild setup https://www.nopistons.com/forums/pub...IR#>/smile.png got any pics of the intake ports?



with the pipe inside the other pipe, woudln't you want to run the smaller pipe all the way to the exhaust port on the rotor housing face. That way it will be a smooth transition? Or am i missing something with the idea of the pipe inside the other pipe.



Also i would have the headers run for 3" straight out of the engine before the first bend, to help stop any turbulence etc.



cheers



Lance

The smaller pipe would actually mate up with the insert or the port. The larger pipe will cath the blowby. What I mean is how long will they need to be coming off the exhaust port itself, as opposed to the flange.

Dam that is a pretty wild looking port there https://www.nopistons.com/forums/pub...IR#>/smile.png



as for the distance, not sure exactly which distance you mean, so i will try and explain them all https://www.nopistons.com/forums/pub...IR#>/smile.png



in your case, the factory sleeve is revmoved, you have the 2 pipes 1 smaller and 1 larger, the smaller fits inside the larger, the smaller pipe is inserted so it is hard against the exhaust port on the rotor housing face. It then extends all the way through the tunnel and stops at the end of the rotor housing (as in where the header flange bolts) As for the larger pipe i would have that run the same, though i reckon you might have dramas with the larger pipe, as there might not be enough room for it due to the floor of the exhaust port tunnel being to high. Now for the headers, you want the headers to extend 3" from the header flange before the 1st bend. You also want the exhaust port on the rotor face to merge nice and smoothly into the smaller pipe, and then merge nicely to the larger pipe, and then merge nicely into the header pipe. The only problem i can see is how are you going to stop any blow by getting in between the larger outside pipe and the rotor housing? You may want to consider not running the larger outside pipe, and just run maybe a thicker inside pipe and be very thorough in that it meats up to the exhaust port on the rotor housing face, with out any leaks



cheers



Lance

Red------------Small pipe



Yellow---------Large pipe catches any excess pressure



Orange--------both pipes join back into one on the way to the collector