I'm about a week away from building up a street ported 4 port 13b and I had some questions about porting the intermediate plate. I've have hurd that in a street port you leave the intermediate alone and port the side plates. But it's tempting to port them all. What's the deal? thanks.


Nick

 

Port them all, and if you want to go slightly higher, give the center plate a medium to large streetport, and give the end plates a small to medium bridge.

 

I would like the car to be fairly streetable so I'm hesitant on going bridgeport plus fueling that beast. I haven't bought the carb yet and but leaning towards a weber 48 ida. Would that fuel a bridgeport or would I have to go weber 51?

 

48 would function but 51 would make more power. MPG ~11

 

Thanks guys for the info. another question I had before grinding is I bought the rb street port templates and the way they line up, 95% of the material I remove is from the top of the port. That sound right to you guys?

 

From the pics I've seen, that sounds right. Look on mazdartix, if I remember right they have a good explination of porting with pictures.


Less than a week away huh? keep me posted..........................


--Alex

 

Yes most of the material removed in a port job is the outer edge and upper end. Its for an earlier opening and later closing giving more duration, not sure if theres any overlap on a SP. A BP gives overlap on the ports, like a hot cam on a boinger which accounts for the brap brap loping idle.

 

If you go half bridge, you can use a 4 port (holley), and when you are on the primaries you will get better gas mileage, and when you romp it you will be thrown back in your seat.