I think they are around 190 on the exhaust duration and 130 on the transfer
timing but I am not sure...it's a reliable drag port...not too radical. Call or
email Rick at RitterRacing (see link above) if you would like more technical
details. He likes relatively high transfer timing to allow more time to draw in
the fuel charge because he does not like to hog out the intakes too much because
it reduces intake velocity. He also does not like excessive exhaust port timing
which will reduce your cranking pressure, but as you can see, the exh. ports
have been widened conciderably to help with expelling the spent charge.