I`m about to build a na bridgeport 13b for a rally car, but this is my first bp so I could need some advices.The engine is a 88 6port,the front/rear plate will be bridge ported,the bevel on the rotorhousing over the bp is 2mm x 2mm and I will use Atkins 2mm 2piece apexseals.I`m not sure how big I can make the bp, so have a look at the pics and give me some comments.

For the centerplate I have some problem deciding what to do,bp or street port..?

This engine will only be driven at the race track,so I want the most out of it.

My concern is if I bp the center plate, how will that affect the corner piece of the apexseal and how reliable will it be?I don`t want a engine that is "selfdestructive", I want the engine to be reliable, so I could need some help to decide what to do.

I`m gone use the stock throttlebody with a custom intake manifold.The tubing on the manifold is 45mm for each secondary port, and 2x35mm connecting to 1 45mm just before the throttlebody for the primary ports, and it will have a stand alone to control fuel/ign.

How much power can I expect?

The engine is going into a VW Beetle by btw.

Any help appreciated

pic of the bevel on the housing.

Pic of the rear plate and housing.

one more

Pic of the ex. port.

one more of the bridge.

The bevel on the rotor housing is intersting.. I have never seen that, but then again no one post pixs of porting.....

Here`s a drawing of the port with some messurements.

The bevel on the housing is for better flow.

it looks from the pics as if u ported inside too much on the aux port, are u sure its not in the way of the oil seal track?

The aux port is ported to the outer edge of the oil seal track.The front and rear housings are european spec. without rotating the sleave, it uses a butterfly valve in the intake manifold to open/close it.

How wide can I make the eyebrown, or how wide must the bridge be?