I just finished porting and lightly polishing my exhaust port for my 87 TII. Pineapple street port. What do you guys think??

 

nice attempt,, bevel is good at top but needs a slight one down the edges and along the bottom lip also
( though not as extreme as the top lip )

this is to stop the sharp edges raising into the chamber as they expand with heat and making the apex seal skip across the housing
( the top bevel is to stop the sharp edge expanding out and taking out the crowned edge of the apex seal )

some will argue its not necessary,, but they will change that opinion if they ever do a pull down to note evidence of the skip
( like a carbon skip stain yet a nice shiny mark at the exhaust edges )

 

Thanks for the advice! So a slight bevel everywhere but the top and she should be good to go?

 

looks good. Got any advice? i got pinapple medium street port template sitting here waiting for my lazy *** to do it. Its just that the replacement rotor housing I got is NA so it has the diffuser exhaust sleeve that i need to take care of.

 

big bevel on the top ( to save the apex crown ) ,, slight bevel everywhere else ( to save the apex skip )
you can search the subject and you will find ito and others have some good info abouts regarding
general consensus is 1-2mm edges and floor,, 2mm top at a 45 degree angle

 

From what I've heard it is typically easier to just pull the NA diffusers and swap them with turbo diffusers. Pretty sure some of my junk housings have good turbo diffusers if you need some.

Awesome, thanks!!