Thank you sir. They're welded and dropped off for milling and flowing. Will know here soon enough.

 

Look nice! Now you need to find a ol' sleeper to put a LS in!!

 

Indeed. Sir. Would love to pop in the CM Titan III cam and find a **** brown
Chevette preferably with wood grain sides too. Uglier the better.

 

Most of the power comes from the valve work... not the port itself.

So, I would try to find someone who would do a good valve job on it...

 

The shop that's milling/flowing these has an excellent cylinder head fella
They tried talking me into a VJ and If they flow horrible then I'll prolly pony up but really trying to minimize my investment since likely selling this engine anyways

 

Here you go


Flow numbers



Notches

 

The results look pretty good with the stock VJ. I bet with good VJ they will pick up 10-15 cfm more. Sometimes a mere 2 degrees can be 15 cfm per a cylinder head expert.

 

Care to enlighten us a little more on the flow numbers and how they were flowed?

I am guessing #1 is intake and #2 and #3 are exhaust???

Radius inlet used? What size was the flow pipe?

 

Sorry. Was having quite the time just getting the pics to post last night for some goofy reason.
Radius was used on the intake side. Number two is exhaust w/o pipe and 3 is with a 1.75" bend. Approximately 10" long like a 90 degree
Basically my old DIY 241s flowed identical on the exhaust side on a 15K GM valve job and new ZO6 hollows. I will admit that my runner volume was larger than this Katech one. So less efficient
On the intake side, I ground out the rocker bump and bowl blended the 241s this same way and they flowed 246 @.600". So these Katech runners are a full 25 CFM up at that same lift point.
Surprised I guess that these continued to flow more CFM on both IN/EX @.650" and .700" lift points. Useless with most HYD setups Wonder if that's again, this poopy *** GM valve job. Once these are outfitted with the Lunati dual spring kit I will have exactly one grand invested into them which was my self imposed budget if you will

 

Definitely not bad. $1000 investment with springs, well worth it IMO.

 

Thanks Cowboy....glad to see you're doing well these days !!!!!!!!!!!

 

@.500 with 263 cfm is right where stock 243 castings flow. They can be bought for $400. I'm not seeing much value in cnc porting 241 heads.

 

Flowed on a FOUR INCH BORE
go ahead and compare all the lift points of my 500 dollar CNC'd crap castings to
The single finest GM cathedral flowed on a FOUR INCH BORE
I really love the stall going on beyond the .500" lift point which you choose to use since nobody cams their engines by opening the valves more than that

 

From one of the best in the business
Here's Phil's numbers
Still not seeing where my cheap as heck heads did all that bad considering
My only intention is to show an alternative option for a mid price point. That's it

 

I think your heads did pretty darn well

 

Were yours flowed on a 3.9 inch bore?

 

You paid one hundred dollars more than I did but received a valve job plus the dis assembly and reassembled My CNC work was 500 plus I also spent 150 for my surfacing and flow testing. Texas Speed already quantified their work for you. By the time you put a spring kit on your set you were at the thousand dollar price point I'm at. Both great deals IMO.
I needed to flow mine for the purpose of this thread and my surface job was a bit more than the usual clean up cut that shops do for like sixty bucks. Getting .030" taken off tends to run me about $80 since so many tooling passes
The 243/799 heads are the gold standard of GM cathedral however if someone happens to already have these 853/241 heads, they have budget options available to up the power potential
And to answer your other question; yes these were flow tested on a 3.9" bore fixture

 

For a DIY, This is not a bad option if you already had the 241, 853 heads.

It goes to show you don't need to buy a used $400 set of heads that still need a valve job, clean up, and springs. You would still be in the same price point with the 243's by the time you had all that work done and not have the same flow.

 

Good CNC ported 241s will wipe the floor with stock 243s. This is not news.

 

Thanks a bunch man !!!