062 Vortec Heads vs Large port 206cc Vortec Heads

[1980RS]

Since it's winter and things are slow right now I have my set of 206cc 1st design Large Port Vortec heads done. I have the GM Hollow stem intake valves and the 1.55 Sodium exhaust valves in the heads, minor porting (same as I did on the 062's), so I am wondering what do you guys thing the car will pickup with these over the 062 Mild ported heads that I ran 10.90's with this year all else being the same in the engine. Will it be better or worse ET and more or less MPH?

All you your thoughts are welcome.

[PRH]

Do you have a part number for the big heads?

[steve cowan]

Since it's winter and things are slow right now I have my set of 206cc 1st design Large Port Vortec heads done. I have the GM Hollow stem intake valves and the 1.55 Sodium exhaust valves in the heads, minor porting (same as I did on the 062's), so I am wondering what do you guys thing the car will pickup with these over the 062 Mild ported heads that I ran 10.90's with this year all else being the same in the engine. Will it be better or worse ET and more or less MPH?

All you your thoughts are welcome.

Are you only changing heads??
What size runner are the small heads,MCSA,AVG CSA etc
If you can give as much information as possible

[1980RS]

Do you have a part number for the big heads?

I will have to pull them out to get the part number.

[1980RS]

Since it's winter and things are slow right now I have my set of 206cc 1st design Large Port Vortec heads done. I have the GM Hollow stem intake valves and the 1.55 Sodium exhaust valves in the heads, minor porting (same as I did on the 062's), so I am wondering what do you guys thing the car will pickup with these over the 062 Mild ported heads that I ran 10.90's with this year all else being the same in the engine. Will it be better or worse ET and more or less MPH?

All you your thoughts are welcome.

Are you only changing heads??
What size runner are the small heads,MCSA,AVG CSA etc
If you can give as much information as possible

The only thing I know about them is that they are the 1st. design that are 206cc vs 185cc for the small port bowtie Vortec heads. I do know that GM changed the intake port a couple of sizes and that why I got them so cheap from a long time Super Stock racer friend. I have a total with spring kit a little over $400 in them, the valves were free out a pair of LT4 heads that the guy wanted cheaper so we put stainless valves in those heads. Yes I am only going to change the heads for the first test, then I will change the cam for the 2nd test. The car has gone the best of 10.92@120mph with the small valve small runner Vortec heads so far, I am pretty happy with that but I think the top end charge will be stronger with the 206cc runner head.

[steve cowan]

Have you read CGT and Randy 331 stuff on this forum?
Both those guys have used vortec heads for years with amazing results, I don't have links but if you have not researched i suggest to have a look,you won't be disappointed.
I have never done any work on a vortec head but I like the look of the GM vortec 210CC aluminium heads,they are pricey but are a nice piece.i know Randy has done a few sets.

[PRH]

I recently had a set of aluminum “fast burn” vortec style heads here for a look over after there was a little incident with the GM crate motor they came off(through no fault of the motor itself).
The part number for the heads is 19300955, and the casting number for the ones I had here was 12367712.
I looked them up on line, and the advertised flow numbers looked......well..... “too good”.
So I flowed one. It was less than advertised.
The flow @.500 lift(which is where the intake peaked) was 256/156.
Not bad....... but not really anything fantastic either.

Edit: I see there are new numbers posted by Scoggin-Dickey which are much lower than the early numbers that were advertised, which were like 275/190.
Of course, the description is calling them the new and improved fast burn head...... I wonder if it’s the same casting number as what I had here.
They were old enough that they didn’t come with the beehive springs.

[PRH]

After poking around on the ole net a bit...... I see that the OP is going to be trying Heads that have nothing to do with the ones I posted about above.
So...... sorry for the hi-jack.

[af2]

I believe they are these and look good on the cover....

https://www.chevytalk.org/fusionbb/show ... id/103097/

[1980RS]

After poking around on the ole net a bit...... I see that the OP is going to be trying Heads that have nothing to do with the ones I posted about above.
So...... sorry for the hi-jack.

Well, not quite true. While the Fast burn heads are a little different the heads do share some similarities. I decided this will be a better option on the 406 as this allows me to use my next cam with the new heads after the test with the little cam.

[1980RS]

I believe they are these and look good on the cover....

https://www.chevytalk.org/fusionbb/show ... id/103097/

Those are the ones I have.

[steve cowan]

After poking around on the ole net a bit...... I see that the OP is going to be trying Heads that have nothing to do with the ones I posted about above.
So...... sorry for the hi-jack.

Well, not quite true. While the Fast burn heads are a little different the heads do share some similarities. I decided this will be a better option on the 406 as this allows me to use my next cam with the new heads after the test with the little cam.

Hi Bob,
Running 10.90s @ 120 mph means you have your car set up well.
Would you be willing to share some more information on your car,converter, gears,tyres cams etc,I like the way you test at the track as I am in similar position with track testing.

[67 Nova]

Bob, I'm watching and learning closely as this MIGHT be right up my ally.

Due to some financial commitments, I might HAVE to take possession of a '78 Z28. It's a nice car, 4sp with a 12 bolt. Anyway due to the weight of these cars, I would probably go 406/408 (400 sb GM 2 bolt block). I would like to do a budget pump gas motor, probably reusing the OEM crank after checking and either 5.7 or 6.0 rods. Just depends on the deal for rod and pistons when the time comes.

So with that being said, I was sent some info from Team Chevelle site where another guy used stock906's on a mild 406 and went 11.60's. He then swapped to ported 062's and went 10.92 @ 119.67. Actually, are you the guy from Team Chevelle?

Anyway, I like the results and was looking around for Vortecs, either 062, 906 or the 206 cc large ports. But also wondering if in my case, I would be better running Jegs 195cc SB alum heads?? Seeing that I have a AFR Titan dual plane for it, the Jegs 195's (that I'm told are actually renamed Profiliers) might be about the same cost as me sourcing and doing up the Vortecs?

Your thoughts? I'm not a sb guy so I don't know much on these.

Thanks, John

[RevTheory]

Just a heads-up; I've only ported one set of 062s but I busted through the pinch at ~1.08 width; right around 1.96 mcsa. May have had a core-shift issue, can't remember.

[steve cowan]

Just a heads-up; I've only ported one set of 062s but I busted through the pinch at ~1.08 width; right around 1.96 mcsa. May have had a core-shift issue, can't remember.

20201223_061116.jpg

Hey Rev,
I patched a couple on my Darts the other day,piece of measuring tape and marine epoxy
Is it the best option??but if you need the area what else do you do.