I was reading last night about how having a larger throat lets the cylinder get a bigger gulp of air when the valve first opens. This is supposed to help with reversion. I thought of this thread. The guy writing it was a small timer who ports out of his garage on a home built rig. He took 6th in the Popular Hotrodding Engine Masters Challenge. He has gotten Vortecs up to these numbers. I know your guy has smaller valves holding him back. I was just pointing out the wow factor of both.
Vortec 062sbc
2.055intake valve
.1-65
.2-124
.3-187
.4-238
.5-274
.6-291
.7-279

 

I'm not sure what those numbers mean, I'm looking forward to seeing what my heads flow after this work is done to them. I know that you want the throat opening size to start as soon as possible to the end of the valve seat. There is really alot that goes into it, more than I'll ever know without being immersed in the stuff all the time, and my work involves computers and networking. I'm interested in things though. I may continue to hang out there on occasion and assist with some builds until I do get a good handle on things.

It seems like Vortecs are a good head from the factory, and it seems like there is alot of potential left on the table.

 

Heads are ported 2.02 and 1.60! Throat is at 91% I believe, they are getting blended in now, intake and exhaust will be fully ported and opened up. I can't wait to see what they flow now.

 

Those numbers represent the flow in cfm at a given lift. A comparison would be yours flow 254cfm at .500" lift. The ones I posted flow 274 cfm at the same .500". Like I said its kind of apples and oranges. Yours were flowed with a 1.94" valve the others 2.05". I wasn't even aware they could be opened that far until I read the guys web page. I am almost wanting to send my heads to him. His prices are great. $300 for a full port and polish, its a solid $1000 for a max effort port job. Those are normally about $1500. I came across his while reading a thread on Yellow Bullet. Holy crap that is a forum I won't ever be part of, talk about pissing and moaning. Those guys just bicker.

 

The thing is if he opened up the intake port then to 2.05, he could not have done anything with the exhaust port. Mine are touching now. 274 cfm is nuts for Vortecs. Is that guy you posted the numbers from the one who is cheap?

Porting - Voodoo Race Engineering

This is where my builder has his prices. He will do mail order too.

Oh, and YellowBullet is really something else, I don't spend any time there, I'm a member and have gone there a few times to check it out. There is a lot of smack talking that is for sure.

 

I can't say but from my prospective he's cheaper. Yes its the same guy. Weingartner Racing

 

2.02" to 2.05"?? I doubt most engines or cars would notice much change from a .03" difference in intake valves? The heads I took off my 327 were 2.05 heads and I like my old camel hump 2.02's much better! There is such a thing as too much flow, if you don't have the compression and cam to handle everything.

 

Went and checked out the heads today, they are opened up to 2.02/1.60, which required ALOT more grinding on them. The exhaust ports are also done too now, and the intakes need hit with a sanding roll yet. The other head is only stock still with just the valve job. Both of them are also still only a rough valve job, they need to go back to the shop to get the seats cut to a 5 angle valve job. I've looked at pics of a lot of Vortec heads, and I can't say that I've seen any that look like these.

This is the difference between the stock vortec opening and the finished one.





Probably 5 pounds right there.







Exhaust is done, intake needs hit with the sanding roll again. Getting the valves cut bigger probably tripled the porting work.









This is one head down, the other one still needs so much work.

 

I like it when the corners are all symmetrical. The guy who opened my heads to a 1206 just couldn't control the cutter. The work I did on my intake looked better than his. I know the next go round will be a pro.

 

I can't control the cutter, I've tried, it bounces all over the place. I'm sure with practice I could get ok at it, but it is knowing how and why and where to cut I would never get. I've spent some time watching the guy doing my heads and even putting the cutter in the area next to the valve guide where it is getting grabbed on 3 sides of it he doesn't miss a beat. Right out of High School he pretty much went into this line of work. He was building drag race engines while he was in high school. I remember in 5th grade sitting in the library at school with him talking to me about 350 engines, horsepower and torque etc. Needless to say at that age I wasn't following him, I was more into riding my bike jumping dirt hills in the strip mines for most of my childhood. Later years after 13 or so was more of the same on a skateboard. I had a 72 Nova that I did a bit of work too in High School, but marriage and kids forced me to get rid of it. Since then I've had a 1994 truck that I lifted up, and a 1994 Z28 that I had a flowmaster and K&N on, nothing serious. This car has been a lot of work, so far I've done things pretty much towards a tough street car, this engine has turned a bit from where I was going. It is supposed to still be streetable, and he is saying he always like to estimate low at 480, but alot of people are saying 500. Another thing, I've never seen a set of Vortec heads that were worked on this much, so it is going to be interesting.