062 Vortec Head Test a Success Car goes 10.92

[F-BIRD'88]

By what you posted the weight has increased.....

[1980RS]

By what you posted the weight has increased.....

It's from the weight box in the back of the car to try and get it to hook up better, on a suggestion of the A/Stocker guy I know. I am trying to get the car to pitch and roll better on the launch.

[brentry]

What size valves. If you dont mind me asking.

[brentry]

Nevermind

[F-BIRD'88]

If with 30" tall slicks you will need a lot more gear than 4.10's You want to be trapping at near 7000 rpm + . As high as you can without loosing mph. The converter will also function better... Remove weight in front of driver.

Cal-Trac traction bars. Solid body mounts instead of oem rubber between stub frame and body.
estimate 4.56 to 4.88 depending on tire true height and top end growth... More if u go solid lifters.
Header collector extensions..

What is the eighth mile ET/MPH from time slips compare to 1/4 mile #'s
We used to street race a nos 80 camaro with a Olds big block that was lighter than that.

[1980RS]

If with 30" tall slicks you will need a lot more gear than 4.10's You want to be trapping at near 7000 rpm + . As high as you can without loosing mph. The converter will also function better... Remove weight in front of driver.

Cal-Trac traction bars. Solid body mounts instead of oem rubber between stub frame and body.
estimate 4.56 to 4.88 depending on tire true height and top end growth... More if u go solid lifters.
Header collector extensions..

What is the eighth mile ET/MPH from time slips compare to 1/4 mile #'s
We used to street race a nos 80 camaro with a Olds big block that was lighter than that.

The car right now is done at 6K and the car goes through the traps at 6100 with the 30" tires. I did try my 28" tires but the car slows down with them and the 4.88's I have would work very well with my 358 should I decide to put it back in. You are right, next year the plan is for the solid mounts and caltrcs with new shocks. Next 406 will be very different than this one as I will be using some AFR 210 CNC ported heads and a 13 to 1 shortblock.

[F-BIRD'88]

Your current 406 only needs a solid lifter cam to allow it to trap much higher with the single plane .and 88's Ya no doubt that hyd is going to run out of steam at 6100-6200 ish
I recomend a Isky flat tappet cam. There is a few Crane solids good for this too.

[steve cowan]

I think the cylinder head is at its limit for that cubes.i ran a dart 178 cc head last year on my 383 with a similar cam to yours, and yes I agree you are lift/area limited as well.
I tested intakes,carbs,cam timing,rockers,converters,rpm shift points up to 7200rpm.etc.the pushrod pinch was the choke and I think more lift would of helped slightly.
After a year of track testing 50 plus passes the car at 3650 pounds with me 11.70 @ 115.
1.58 in the 60.
Really not that impressive but a good learning experience for me and the testing was fun and the car ran pretty consistent,
I think you have done well.

[1980RS]

I think the cylinder head is at its limit for that cubes.i ran a dart 178 cc head last year on my 383 with a similar cam to yours, and yes I agree you are lift/area limited as well.
I tested intakes,carbs,cam timing,rockers,converters,rpm shift points up to 7200rpm.etc.the pushrod pinch was the choke and I think more lift would of helped slightly.
After a year of track testing 50 plus passes the car at 3650 pounds with me 11.70 @ 115.
1.58 in the 60.
Really not that impressive but a good learning experience for me and the testing was fun and the car ran pretty consistent,
I think you have done well.

Thanks, The next set of heads I want to try on this 406 were my large port Vortec heads. They are the older 206cc ones and I did the same work to those that i have done one the 17cc heads. I think F-BIRD88 is right the 406 does need a bigger cam but it take the fun away form this telling people what cam it has and watch them roll their eyes. This has been a rewarding year performance wise and all the work over the winter has paid off.

[the rain maker]

After running low 11's with my pump gas 358, I decided to pull a quick one and put the 406 test engine in with the 062 Vortec heads I reworked. They were mildly ported and have some epoxy in places but still retain the stock valve size. For this test I was going to run the GM Performance dual plane but gut instinct said try the ported SV that's made for the Vortec's. Well I am glad I did and here is the first run off the trailer.

1st. run, 11.02@120 mph 1.49 60ft.
2nd run, Changed to a 50% underdrive pulley on the crank
10.92@119.67 mph with a 1.48 60ft. 1/8 mile was 6.86!!

Ran a few more runs all in the high tens except for the last run and it rattled the tires so that was it for me. I am truly blown away with this combo and this is with the Cyclone $59 headers 1 5/8" as my Hooker S/C will not seal at the ports. I feel like I have a Vortecpro engine in my car LOL. Honestly the car felt like I put a 125hp shot on it.

It was a fun night.

Nice results!

[1980RS]

After running low 11's with my pump gas 358, I decided to pull a quick one and put the 406 test engine in with the 062 Vortec heads I reworked. They were mildly ported and have some epoxy in places but still retain the stock valve size. For this test I was going to run the GM Performance dual plane but gut instinct said try the ported SV that's made for the Vortec's. Well I am glad I did and here is the first run off the trailer.

1st. run, 11.02@120 mph 1.49 60ft.
2nd run, Changed to a 50% underdrive pulley on the crank
10.92@119.67 mph with a 1.48 60ft. 1/8 mile was 6.86!!

Ran a few more runs all in the high tens except for the last run and it rattled the tires so that was it for me. I am truly blown away with this combo and this is with the Cyclone $59 headers 1 5/8" as my Hooker S/C will not seal at the ports. I feel like I have a Vortecpro engine in my car LOL. Honestly the car felt like I put a 125hp shot on it.

It was a fun night.

Nice results!

Thank you, pretty happy for a set of heads I mildly port in the dead of winter in a cubby hole in the basement. Wife hates me when I do that.

[1980RS]

Went back out tonight with some crappy air. The best pass was 11.06 with a 1.48 60ft. with, an X-pipe and 2 of the regular flowmasters. Must have worked well as when I opened the cutouts that car spun the tires enough to ruin my 60 ft times after that. The newly made 1050 Dominator really smoked the tires so I will have to wait for a test day to make it work better. Nice to be able to run quick with mufflers on the car. I am going to switch out the mufflers for either Borla's or Spintech's as there is I guy that runs a 70 Chevelle in the mid 9's@136 with Spintech's and the car is pretty quiet going down the track.

[F-BIRD'88]

Every car I have seen with flowmasters ran faster without them and also faster with other style mufflers.
Why are you having so much trouble with traction on that car?

What was the mph open, and muffled?

[econo racer]

I keep hearing rumors that the vortec headed motors run faster at only 28-30 degrees timing. Can anyone verify that?

[Monza355]

Have you made a switch to a 1050 cfm Dominator carburetor since you went 10.92 ?