Vortec CT350 crate in a street car.

[ClassicRob]

its a 247@.050" on a 108. Power brakes aint gonna work with that cam. If it was a drag car I would be all over it. Its just a therapy street car if you know what I mean.

[F-BIRD'88]

I ran that cam and bigger in my 350 in my fiebird auto trans never a problem with my power brakes..
I recomend what I know works.
With a manual trans it is even less critical as manifold vacuum is higher.

That 350 (with my ported 305 heads ended up in a kids Nova. No issues with PB.. Kid loved it..

You asked for 425 hp with stock vortecs the easy way..
I gave it to you.. Now go seek some therapy.

[ClassicRob]

I ran that cam and bigger in my 350 in my fiebird auto trans never a problem with my power brakes..
I recomend what I know works.
With a manual trans it is even less critical as manifold vacuum is higher.

That 350 (with my ported 305 heads ended up in a kids Nova. No issues with PB.. Kid loved it..

You asked for 425 hp with stock vortecs the easy way..
I gave it to you.. Now go seek some therapy.

Wish I could, Im too busy working my ass off so I can afford all this stuff. Carb, clutch, flywheel, Crate motor, cam, springs, ignition wires, distributor connector, water pump, belts, plugs, headers, exhaust, new engine mounts, paying engine dyno shop for break in and tuning, oil pan, fluids, thermostat, 3 series carrier, aluminum driveshaft, shocks, rear springs, front springs... all right after it just got out of the body shop and also had a bunch of chassis stuff done to the tune of $4000 and some change... I must be insane!

[skinny z]

Here's what I recommended.

Cam# SBC, H70330-71330-110
224/228 @.050"
.330"/.330" Lobe Lift
.495"/.495" Valve Lift
110 LSA

Lifter# J842H
.842" Hydr F.T. lifter set

Spring# JRC05
1.250" Single Spring w/Damper
115# @ 1.700", C.B. 1.120"

How would that spec change for a hydraulic roller?
Which by the way, intensity aside, is remarkably similar to the roller (XR276HR) I ran first time around. (.335/.340 lobe on a 110 LSA)

[F-BIRD'88]

Here's what I recommended.

Cam# SBC, H70330-71330-110
224/228 @.050"
.330"/.330" Lobe Lift
.495"/.495" Valve Lift
110 LSA

Lifter# J842H
.842" Hydr F.T. lifter set

Spring# JRC05
1.250" Single Spring w/Damper
115# @ 1.700", C.B. 1.120"

How would that spec change for a hydraulic roller?
Which by the way, intensity aside, is remarkably similar to the roller (XR276HR) I ran first time around. (.335/.340 lobe on a 110 LSA)

I thought that that cam was a hyd roller.

[skinny z]

Lifter# J842H
.842" Hydr F.T. lifter set

I thought that that cam was a hyd roller.

I only assume flat tappet by the lifter spec.

[rfoll]

For the OP, I have a really nice set of 604 crate pistons that I can't use due to a huge scratch

DSCN1397.JPG

in my bore. If your bore is in good shape these would be a nice upgrade with some more compression thrown in.

DSCN1400.JPG

[CamKing]

Here's what I recommended.

Cam# SBC, H70330-71330-110
224/228 @.050"
.330"/.330" Lobe Lift
.495"/.495" Valve Lift
110 LSA


How would that spec change for a hydraulic roller?
Which by the way, intensity aside, is remarkably similar to the roller (XR276HR) I ran first time around. (.335/.340 lobe on a 110 LSA)

For a hydr roller, I would go 4 degrees shorter on seat duration, add 4 degrees to the .050" duration, and go to .340" Lobe Lift

[vortecpro]

For what its worth my sons G/crate 330 HP Vortec 350 runs 10.6s @ 123 @ 3200 pounds, no porting on the heads, .417 lift @ the valve.

[dynoflo]

I have probably done 20 of the 602 gm crate engine upgrades. Every one of them got dynoed on my old go power. You have to remember they are pressed in studs. You can shim .030 and still be safe with stock springs to 6300 all day long. Every one had 650 dp. With the bullet cam you dont have to change anything. If you buy new 602 change cam and use lifters it came with and you will make 400 hp and 400 tq. When they first came out the valve springs were junk. Most guys run half season circle track and put new in lately. Nobody i know dropped a valve yet. I personly have a 602 that i am forced to run and it gets springs mid season and and i check them and they are off maybe 5 lbs. It goes 6300 every lap. It is a 2017 crate and has never been apart. It has never been hot or over reved. Always schaffer semi synthetic 15 40.

[skinny z]

I have probably done 20 of the 602 gm crate engine upgrades. Every one of them got dynoed on my old go power. You have to remember they are pressed in studs. You can shim .030 and still be safe with stock springs to 6300 all day long. Every one had 650 dp. With the bullet cam you dont have to change anything. If you buy new 602 change cam and use lifters it came with and you will make 400 hp and 400 tq. When they first came out the valve springs were junk. Most guys run half season circle track and put new in lately. Nobody i know dropped a valve yet. I personly have a 602 that i am forced to run and it gets springs mid season and and i check them and they are off maybe 5 lbs. It goes 6300 every lap. It is a 2017 crate and has never been apart. It has never been hot or over reved. Always schaffer semi synthetic 15 40.

What would you trust a 602 shortblock to handle? It would be a carry over with aftermarket heads, cam, valve train and intake. If the top end parts can provide it, would the 602 short take 450 HP? 500 HP? Not so much circle track but certainly drag strip. And lots of highway miles.

[rfoll]

For what its worth my sons G/crate 330 HP Vortec 350 runs 10.6s @ 123 @ 3200 pounds, no porting on the heads, .417 lift @ the valve.

I'm trying to understand how this is possible. I have a 3500 lb, (with me in it), 78 X body. The engine is a 415 solid roller with a Holley 300-25, 800 dp, Track 1 heads, and 5100 converter. My best pass is 10.88 @ 122, 1.5 60'. It is much easier to believe 11.6 except for the 123 mph you posted..

[vortecpro]

Its IHRA crate engine, not GM circle track engine. Which means its like NHRA stock eliminator "stock" 450 + dyno HP. BTW it 60s 1.36.

[1980RS]

For what its worth my sons G/crate 330 HP Vortec 350 runs 10.6s @ 123 @ 3200 pounds, no porting on the heads, .417 lift @ the valve.

I'm trying to understand how this is possible. I have a 3500 lb, (with me in it), 78 X body. The engine is a 415 solid roller with a Holley 300-25, 800 dp, Track 1 heads, and 5100 converter. My best pass is 10.88 @ 122, 1.5 60'. It is much easier to believe 11.6 except for the 123 mph you posted..

My 406 with Vortec 062's ran in the high tens and that engine had a mild flat tappet hyd cam and stock rockers with little cheapy headers so I can see where Mark could get one to run that quick with a big stick in the engine with "stock" heads.

[vortecpro]

123 MPH @ 3200 pounds = observed 459 HP crankshaft HP.