he's got stainless marine manifolds with stainless risers

Yup, Stainless Marine with the Stainless risers. Personally, I think Dyno's EMI Thunder setups would work just as well with blowers.

the EMI's are cheap but I hate the riser gaskets they need to be replaced about every spring!

Who's spark arrester?

I think I have the same problem with Whipple charged 454s. I picked up 1.5 mph by going from a 10"x2" to a 8"x3" flame arrestor. What was the dimensions on the flame arrestors you removed?

Ian T.

Crazy....inquiring minds need those torque numbers when you get the printer running....Fred

Ok, these are the shortie Gaffrig arrestors. I'll measure them and post it this afternoon.
The dyno shop is wiatung for their new printer to print me the torque and horsepower tables.

OK I know there have been posts on this before but is a K&N spark arresstor less of a horsepower robber than a same size stock or Gaffrig type?....Fred

The guy at the dyno shop said most people take all but the last two layers of screen out of them.

Can stock/factory type units be taken apart and have screens removed?....Fred