Inexpensive 350 Build

[vortecpro]

My son built this inexpensive 350 and I thought it might be of interest seeing it will be run in the car at the track soon. Here's what he built, he started off with 1 piece 350 roller block 638 casting, used 4 valve relief hyperutectic flat top pistons, stock GM O rods, factory 3.480 stroke crank with a Comp hyd roller cam .502 lift 224/230/110. L98 heads were used with a 2.003 intake valve and 1.50 exhaust, the intake is a Performer RPM air gap. Factory GM 4 quart pan. The track test should be interesting! Some pictures

[Monza355]

Sounds very interesting. There’s nothing better than a drag test. To bad they’re not as popular to share as engine dyno testing.

Can you tell us a little bit about the test car ? And where you race ?

[turbo camino]

What ring package - 1.5/1.5/3, like the later L31 used?

[vortecpro]

Sounds very interesting. There’s nothing better than a drag test. To bad they’re not as popular to share as engine dyno testing.

Can you tell us a little bit about the test car ? And where you race ?

What is better is a dyno/drag test, and we have both here, not fancy parts here, but data to share no matter the results.

[vortecpro]

What ring package - 1.5/1.5/3, like the later L31 used?

5/64/5/64/3/16 Moly Sealed power rings. Think cheap......................

[vortecpro]

Sounds very interesting. There’s nothing better than a drag test. To bad they’re not as popular to share as engine dyno testing.

Can you tell us a little bit about the test car ? And where you race ?

The car is a mid 80s Camaro raced @ 475 feet elevation, dyno tested @ 900 feet elevation. The car has a T350 with 4.56 gears, 9 inch slick, around 3200 pounds race ready. All testing will be done @ Xtreme Raceway. More pictures

[turbo camino]

$350 bux?
https://www.summitracing.com/parts/slp-h815dcp30
https://www.summitracing.com/parts/slp-e-921k30

[Eroy]

$350 bux?
https://www.summitracing.com/parts/slp-h815dcp30
https://www.summitracing.com/parts/slp-e-921k30

Silvolite makes one with metric ring pack as well, similar price. I used a set recently. Plus they are 1.560 Comp height.

[Justa1time]

Vortec pro:
Mahla 224-3497
Quality Piston with desirable ring pack to be had for less than $300 w/Rings.

[vortecpro]

Vortec pro:
Mahla 224-3497
Quality Piston with desirable ring pack to be had for less than $300 w/Rings.

That would be the way to go if they made them in oversizes. Thanks

[turbo camino]

224-3497.030

But I don't see the point in that, since the 2mm top ring is .0787" (metric version of 5/64")..

[vortecpro]

224-3497.030

But I don't see the point in that, since the 2mm top ring is .0787" (metric version of 5/64")..

The Mahle piston is lighter than the H345 piston we used. We did take 17 grams out of the O rods, we also did some work to the crank.

[skinny z]

My son built this inexpensive 350 and I thought it might be of interest seeing it will be run in the car at the track soon. Here's what he built, he started off with 1 piece 350 roller block 638 casting, used 4 valve relief hyperutectic flat top pistons, stock GM O rods, factory 3.480 stroke crank with a Comp hyd roller cam .502 lift 224/230/110. L98 heads were used with a 2.003 intake valve and 1.50 exhaust, the intake is a Performer RPM air gap. Factory GM 4 quart pan. The track test should be interesting! Some pictures

Very similar to my 1st roller cammed 350 (same XR276HR). Same pistons. Vortec heads rather than the L98's. Compression came in at 10:1 with the piston .030" down and a .026" gasket. The Vortecs had .006" taken off to true them up.
Also in a mid 80's Camaro.

Dynojet said 280/282 HP/TQ. 700R4 in drive with an aftermarket 10" converter.

Best pass in full street trim other than ET Streets. 3.73 rear gear. 3600 lbs w/driver. August 2011:
630’, 73.4F°/23C°, 29.83” Hg/101.02 kPa, 65% rh
DA: 2046’
12.75 @ 105.93, 8.082 @ 83.39, 1.74 60’
12.449 @ 108.551 MPH corrected

I trust you'll be considerably quicker than that!
Watching with interest

[Justa1time]

Vortec pro:
Mahla 224-3497
Quality Piston with desirable ring pack to be had for less than $300 w/Rings.

That would be the way to go if they made them in oversizes. Thanks

Rings should be:

https://www.summitracing.com/parts/mah-41616cp


These are made in oversizes. You just add .020, .030, .040 after the p/n. I bought my set from Autoplicity.

I literally have the same budget 350 concept as you and a few others. The irony of this is I tried to call you a year or so ago due to your name to talk with you about Vortec heads. You called back but I was already working at that time. Keep us updated on your project!

[turbo camino]

What is the advantage of a 2mm (.078") top ring over a 5/64" (.078") top ring?

The L31-type pistons are 1.5/1.5/3mm, same as the LS. Less friction, less heat, less wear, better sealing.