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Snap-on has been screwing their truck distributors for years and their tool quality has dropped, most likely made in China like everything else.

How did you scale the templates? Or did you buy his CD. IF you're making templates put me in for an order and I'll pay you.

The Narley opening is 41.5 x 28mm for the racing mod and as stated, there are three levels with all having the same floor mods but the opening,roof and bowls mods are targetted for street use with higher velocity gains at lower RPMs . My plan was to start at around 36mm and work outwards till...

What are the dimensions of the oval opening and are how you calculating these velocities without an actual port to base them off? It seems you've applied a lot of clay within the port for this particular experiment, so my question is, how would expect the average enthusiast or hobbyist to...

Here's Marks BSA 883 oval ported on the dyno

You do realize JS Motorsports has 3 versions of the Narley port? One for the street(CCs) middle(S&S) and the layout you provide for all out racing. Due to the bowl enlargements,the power band will change dramatically, sorta like adding more cam duration. You need to read Mark Parkers testimony...

If my memory is correct on the XS you can only raise the roof 3mm and are limited to opening the sides too. Years ago Hanson Racing out of Californa took the XS exhaust port and duplicated the resigned racing E/P that featured the straightening it out for better flow performance. Now mind you...

I'd be asking what's the progress is with my head, for the Norton Narley mods no not him,it's JS Motorsports,his name is Jim also.

If Bob ported that head, he was having a bad day because he had a particular way of porting the exhaust while over the years incorporating a D shape to the exhaust. Unfortunately, I no longer have those photos he sent me to show you what he did but I will check.

If using stock guides, I take the exhaust length down to the intake. Looking at the bottom inside of the exhaust guide, you'll see a step that serves no purpose take it down to that step. When I purchased K/W guides decades ago both guides were the same length, they may not be that way now since...

If that head was ported by Bob you have something rare indeed. He once told me to concentrate on the exhaust port and for every 100 lift the flow should double and he was right. The first head I ported did just that on the exhaust and I did it all by using my fingers using 80 grit, 120 grit...

Years ago I was given a flow data sheet of one particular head that some considered the holy grail XS head but not me because no one head fits all applications despite what some think and Shell Theut(SP) knew that also. Max flow came in at 181+CFMs at 500 lift I believe and exhaust came in...

I just want to make it clear, that I'm not upset with anyone for anything. When Bluz mention that his calibrations were off,a bell went off knowing that no two benches could possibly be this far off in CFMs, it is just impossible to have one bench so far out of calibration and I'm just totally...

It has been brought to my attention, which could have been done privately but it wasn't, that my porting numbers were off which I truly had no idea they were inflated. When I first started my porting adventure I searched the web for a porter to flow my work and I found a guy who became a very...

You've got to be kidding me, are you saying my good friend has been misleading me with inflated #s for all these years? I'm truly lost for words here and beyond embarrassed that he would do that to me. Everyone, please accept my apologies and Thank You Bluz for bringing this unfortunate...

As always Christian, you're an encyclopedia of knowledge and I will check out those Naca papers as I had no idea the history D porting went that far back

Hi Christian and yes I saw you posted on that subject over at Access Norton and after researching what it would take to convert this Harley port,l lost interest.

Yes the head was flowed on a SF 110 , then flowed it on his friend's SF 600 to validate my friend's 110 cross-over formulation numbers and you also validated my numbers on your DIY flow bench. As for the D port being a high RPM port, you need to go back and check the gains achieved from 100 to...

The thing to remember is a flow bench is nothing more than a tuning tool that can never duplicate a real engine running dynamics. To some extent, dead areas like in the corners or floor can become active at higher RPMs preventing port choking and allowing more HP fine-tuning at higher RPMs. I...

Bluzplayer, The one area of the port I didn't explore much was what I call unshrouding Or eyebrowing the area around the guide boss and transitioning it to the bowl and long side. You don't hear a lot of discussions doing this mod on motorcycle ports with the exception of Nortons( the idea came...