[ponjohn]

Very informative.

Thank you.

[hurryinhoosier62]

Originally Posted by gtofreek

When using odd angles, you are stuck with using stones to do the valve job, or buying a lot of custom cutter blades.

Lord knows I've "eaten" more than my fair share of dust from odd angle stones over the years.

[gtofreek]

Originally Posted by mgarblik

I have the same Sunnen VGS20 machine and really like it . Wish it had a little more throat space for some operations like guide liners on some heads. I have the older Sunnen valve grinder and it is not centerless so I have to dial indicate every valve stem before grinding. Takes some time but does a nice job. Paul, have you tried the Joe Mondello signature cutters he developed a few years before his passing? I think they are just great for many applications and available from Goodson. A nice selection of 50 and 52 degree cutters there.

No I haven't. I'll have to look into those. We need to get some 50° and 52° cutters, because right now, I have to do those by stone. We don't do many in those angles, but lately have been needing them more often. I have a Goodson catolog at work, I'll take a look. The Sunnen catalog doesn't show any, so it would have to be custon from them. I wish the VGS head more depth also. Some of these OHC heads can be a pain getting it so you don't have to flip the head around after cutting the seats on one side. Sometimes, just a 1/8" is all I need. Frustrating.

[gtofreek]

Oldsmobile used 37.5° on some of their exhaust seats in some V-8's. Some industrial engine I did years ago, I believe it was International, had 15° intake seats. Talk about a flat valve!

[gtofreek]

Here is what it did after I Re-ported it. Gasket matched to a Fel-Pro #1233 intake gasket.
I don't think I mentioned earlier, but I flowed these at 28" of water, on a Superflow 600.

_Lift____In____Ex____E-I flow ratio
.100____76____75_______99%
.150___115___100_______87%
.200___149___134_______90%
.250___181___153_______84%
.300___213___173_______81%
.350___242___195_______81%
.400___265___210_______79%
.450___282___219_______78%
.500___296___226_______76%
.550___308___231_______75%
.600___316___236_______74%
.650___321___239_______75%
.700___321___243_______76%
.750___321___246_______77%
.800___321___248_______77%

[steve25]

Where the Exh valves still the as delivered 1.66" Paul?

[AG]

Just to verify: seats are 45° on intake and exhaust? Did you have to recut the angle on the Ferrea intake valve?

[mgarblik]

I am no expert like a few others on here, but I really like the flow progression on the head you have just posted. With a .600-.650 lift cam, it is really nice. I particularly like the intake/exhaust ratio progression as the valve opens, with near 100% at low lift when cylinder pressure is high to extract lots of exhaust when the valve is first cracked. Many porters forget how important low lift numbers are on the exhaust side. Those heads should make excellent mid-level power.

[gtofreek]

They have the 2.11"/1.77" valves in them. I got the Ferrea 6000 series RAIV valves that were 45° on the intake already.

With these going on a Turbo engine, the high low lift exhaust should really help to spool the turbo up when the valve cracks open.

[hurryinhoosier62]

Nice numbers, Paul.

[conceptfab]

Paul did a great job on my heads! Thanks!

[steve25]

Paul you would have been able to shift the flow curve down even lower had the heads not been on there second valve job when you got your hands on them!