350 Vortec Head Track Test Update

[vortecpro]

I was finally able to run a full !/4 mile run on our 350 Vortec headed Camaro. Some might remember we posted 1/8 mile times from the Camaro in another thread. A recap on the engine combination: 355 with a dished piston, one piece rear main seal block, 638 casting, 5.7 rod, hyd flat tappet cam 435/460/258/106, unported 906 casting Vortec heads 1.940/1.50 valves, screw in studs, race valve job, surfaced to 62.5 CCs, GM Vortec single plane intake with a 750 Holley, MSD 6AL ignition, Canton 6 quart total oil pan. I made several runs all resulting in wheel spin except two, my best was 10.79 @ 121.39, I believe we can do better after a trans rebuild, its impossible to shift accurately seeing the trans slides both gear changes, we will probably be able to find more in the transmission. Also I was going through the lights @ 7700 RPM which we need to do something about. Also a tire change is in order due to the fact our 60 foot has slowed. I will get back on this project after I get some more customers work done, I will then report back after more testing.

[novadude]

What were the cam specs? I found this confusing:

"hyd flat tappet cam 435/460/258/106"

Were the dished pistons just basic 1.5/1.5/3.0 vortec stock replacement? Damn nice 1/4 mile time / mph!

[bpenrod]

I was finally able to run a full !/4 mile run on our 350 Vortec headed Camaro. Some might remember we posted 1/8 mile times from the Camaro in another thread. A recap on the engine combination: 355 with a dished piston, one piece rear main seal block, 638 casting, 5.7 rod, hyd flat tappet cam 435/460/258/106, unported 906 casting Vortec heads 1.940/1.50 valves, screw in studs, race valve job, surfaced to 62.5 CCs, GM Vortec single plane intake with a 750 Holley, MSD 6AL ignition, Canton 6 quart total oil pan. I made several runs all resulting in wheel spin except two, my best was 10.79 @ 121.39, I believe we can do better after a trans rebuild, its impossible to shift accurately seeing the trans slides both gear changes, we will probably be able to find more in the transmission. Also I was going through the lights @ 7700 RPM which we need to do something about. Also a tire change is in order due to the fact our 60 foot has slowed. I will get back on this project after I get some more customers work done, I will then report back after more testing.

Nice!

[ChopperScott]

Impressive. What is the compression ratio? What does it weigh on the line?

[vortecpro]

Although I didn't ck the compression I believe its around 9.8, 440 HP, weight is 3200 race ready. got busy to change tires, and that cost me, I think I can get it to run 10.60s next time out, the trans need freshened, its sliding both gear changes. DA was 2100.

[vortecpro]

What were the cam specs? I found this confusing:

"hyd flat tappet cam 435/460/258/106"

Were the dished pistons just basic 1.5/1.5/3.0 vortec stock replacement? Damn nice 1/4 mile time / mph!

Cam Hyd Flat tappet

Intake .435 lit with a 1.5 rocker
Exhaust .460 lift with a 1.5 rocker
258 @ .050
106 lobe separation

Fordged vortec 330 HP replacement pistons .030

[skinny z]

Cam Hyd Flat tappet

Intake .435 lit with a 1.5 rocker
Exhaust .460 lift with a 1.5 rocker
258 @ .050
106 lobe separation

Fordged vortec 330 HP replacement pistons .030

What RPM range do you operate in?
7700 at the top end I see. What would be the lowest RPM you see once you've pinned it? Converter stall speed I suppose.
That 106 LSA stands out to me.

[ClassicComp]

Solid lifter camshaft?

[Caprimaniac]

That I will call a great result.
Myself struggled to get 2400 lbs with a347 sub 11.00 sec. That was with aftermarket heads 0.6’’+ lift…. And a roadrace chassis and a leaking cylonders, however.
It’s probqbly inthe chassis, the driver, well rhought out engine combo. Congrats!

[novadude]

Perhaps a dumb question, but is this some kind of stock / super stock class racing that allows the 330hp crate engine? Lift looks like stock 330hp crate cam, and as you've stated you are running 330hp replacement pistons. I'm assuming that's the reason lift is so limited.

[rebelyell]

---- unported 906 casting Vortec heads 1.940/1.50 valves, screw in studs, race valve job, surfaced to 62.5 CCs, GM Vortec single plane intake with a 750 Holley, ------, I will then report back after more testing.

? Seat Angles ?

[vortecpro]

Solid lifter camshaft?

Hyd zero lash

[vortecpro]

Perhaps a dumb question, but is this some kind of stock / super stock class racing that allows the 330hp crate engine? Lift looks like stock 330hp crate cam, and as you've stated you are running 330hp replacement pistons. I'm assuming that's the reason lift is so limited.

Not at all, IHRA G/CM class but they don't run it any more, can run NHRA stock/super stock combo races though, but I'd run my Buick in that over the Camaro.

[vortecpro]

---- unported 906 casting Vortec heads 1.940/1.50 valves, screw in studs, race valve job, surfaced to 62.5 CCs, GM Vortec single plane intake with a 750 Holley, ------, I will then report back after more testing.

? Seat Angles ?

35/45/60/75

[steve cowan]

At 3200 pounds 440 hp should run 11.0s @ 120 mph if car is set up reasonably well.
I am surprised that 355 make that power with stock/ cast heads,cam etc.
Mark might have some rotating friction freed up in ring pack etc.
Don't be surprised if short block rolls over at 10 ft/ lbs or less