Blending radius from seat to throat 1.6"/2.02 valve size from 1.5"/1.94" 

Great video, not boring at all.

Hi Charlie. Look at that, so easy anyone could do it.....after 35 years of experience. You do make it look easy. Thanks Andrew

Good Tv, satisfying like an old chair or a comfort food like meatloaf. I'll be back for more.

I definitely like the real time (the term I'm sure you were thinking of) videos. I noticed you using a valve or other means to control the speed of the die grinder. So I did learn something.

Absolutely put a lot into perspective ..great work sir

Another thing I’d like to see you do is revisit the stock gt40 head and document where you start with the factory head and what areas to address first. I’ve seen you explain what you did with an already ported head but I would like to see you start with a clean sheet of paper 😉

Good video Charlie

I’m glad that you still cut iron heads. Most guys on here won’t touch iron any more and that is what most budget guys are using. Don’t you have to be careful to not blow the throat out too big in this area?

Anxious to see how they flow!

I would like to see you shape the correct short side on a head that really needs it. Since it is at the top of the important areas to address in a cylinder head.

you do good work Charles, wish you were closer and I could send you a set of my heads to work on! That dull burr does put a nice finish on there!

Thankyou heaps for sharing your knowledge . Very much appreciated

Just me, in the first part, thinking I’d have started with Dykem on the valve seat, and done a 60 degree undercut, to get a uniform seat and transition, before doing the blend, kinda as you did in the second part, with the oversized seat. Order of operations, makes for a big difference quality and avoiding “got ya’s”… Good stuff, and thanks for sharing.

When chasing flow on the intake up to lifts equal to 25% of the valve's diameter, the throat and valve job angles all need to be perfectly concentric with the valve it seems. The first move I make is to grind a stone the exact diameter of the throat I want and leave it at 90°. Burn it down into the bowl 30% of the bowl depth. That sets up where the shortside turn needs to be blended into and also where the valve job cuts end. I don't know if it's the best way but it should get me close to what a good single cutter seat and guide machine can deliver. Valve should see full curtain airflow up to .25/valve dia and if the angles and width are right flow should be good to pull on the port at maximum piston speed down the bore.

Hi charlie what angle good for exhaust intake seat?

Good stuff, DV's low budget technique of using a cut up roloc disc for a radius under the seat works great on the exhaust.

Good but would have been nice to see if the changes helped or hurt

Thank you for your knowledge and videos USA 🇺🇸 TRUMP 2024

Thanks Charlie! v/r wh

i like the ex. smooth so carbon doesnt build up as EZ

Charlie could watch you work for hours. Way more educational than listening to you speak. No offence intended

Perhaps should have said could watch your burr for hrs😂

That first cutter has toooo much runout ; however you handled it ,,, !

ASMR for hot rodders.

A lot lol

😂 doing it by hand is a joke and waste of time chasing flow balance. If you have to use the CNC machine