I have been talking to Steve at Lunati about a cam for the velle.
I want more power out of my current setup.

I have a 70 402 with 3.31 rear, 2500 tci stall, and comp 929 springs, 3/8 single piece comp pushrolds, and planning to add....

c396 intake,
holley 3310 vac sec (750cfm)
comp roller rockers, they will fit under stock valve covers
the motor is rated at 10.25 compression, the reads are off of a 67 396 oval port closed chambore

it has STOCK EXHAUST MANIFOLDS
I want to get the most out of this motor so here is what he suggested.

flat tapped 276/280 duration 243/247 @.50 .586/.595 int exhaust
flat tapped 276/276 duration 243/243 @.50 .586/.586
flat tapped 272/282 duration 238/248 @.50 .550/.570 int exhaust

how does this sound? For what I know the pistions are stock


Brian

Sounds a little big to me.........but Steve knows better than I!!

I`d go with the bottom cam if it`s a solid cam. I would`nt go much bigger than that myself.

I aggree with Dan,those cams are to big for your basic setup esp with stock exhaust manifolds.

I would chose something in the range of 225-230/230-240 deg dur @.05,.525-540/.535-550 lift,110-112 deg L/S angle.

Generally when running stall converters people are also running headers and your not which is somewhat of a mismatch,not horrible but still not the best situation which forces you to run a little less cam due to the restictive ex maifolds.

You cant run as much cam (esp Dur @ .05) as you should with the 2500 stall converter when you have stock ex manifolds and the 3:31 gear is just making it with the 244 deg dur @ .05 cams you have choosen too. Some people would say 331 grear is not enough for 244 dur @ .05 with a 402 but i have driven a 70 402 4 spd setup/dialed in correctly with a comp 292 mag cam with 244 dur @.05 and it was ok but it's he most cam i think could be run with 331's and he had headers too .

Scott

The seat duration is still somewhat small, so you can run these cams fine with your setup. The rates at .050 just show how fast the ramps are, which will open the valves fairly quickly. Go with the larger one if you ever plan to install headers, or go with the smallest one if not.

I'm with Scott on need for headers! 1.75 headers with 3"exhaust and I think the 3rd cam as previously suggested would work well with your combo. If you go to one of these cams please add the headers to wake up that engine! You're on the right track to sort out the best combo for your application. How much track time compared to street?! Good luck!

Tell Steve you want the old Ultradyne 280/288 cam (not sure what lunati calls it now,but it is on the lunati website)
223/231 @.050 .525/.550 112 LSA
This cam will run low 12's in a 402 with the right gear,convertor,tuning and traction (BB Mike has gone a 12.55/109 MPH with it and Ed "racer 1320 went a 12.30))
I run this cam as well in my 454 (although small for my motor) and it does work good w/stock exhaust manifolds.
Figure it should be good for solid 13 second performance in a 402 with manifolds and 3.31 gear

Much more street than track time is what I plan, do you think running the power brakes could be an issue with the bottom cam? Or with the cam Mr 4 speed suggested. Sounds like the 2 top cams are 2 much. I like the stock exhaust manifolds because the car looks stock and my tires are 25.1 in height. 26 in was stock so in effect I am running 3.41 gear right now. i would like to keep the tires as well. When I go to the track I can put some biggies on the back. thanks for the input , really helps out

Brian,there will not be any issues with power brakes with my cam.
I suggest if you keep the manifolds is to get a nice X pipe 2.5" system from Pypes..they make a kit that will bolt up to the manifolds.
You will have an extremely strong street performer.
Put on a pair of SSM/Jegster lift bars along with some 235/60 drag radials,and you'll be able to bury the gas pedal to the floor and get that butterfly feeling in your stomach :D

i have the pypes system!!

The lift bars are more than I want as far as the sleeper look!
although tempting:D

Brian,the lift bars replace the lower control arms and the factory sway bar bolts right up.

Are these hyd or solid roller cams?
What size valves? I know that the Solid Roller Lunati (244/252 @ .050 .595/.612 110 LSA) that I had in my 427 responded very well to 2.19" int and 1.88" exh.

I think it's clear what everybodies opinion is on the exh manifolds, as well as, your determination to retain them. My question, is it possible to port and polish the stock manifolds in a capacity that would offer any significant improvement? Has anyone ever heard of a purpose built performance manifold, factory or otherwise?

What about the Lunati Voo Doo cam 60203? We were just talking about that in another thread....someone said it makes good power up to 6.2k and it has a 227/233 duration, 110 lsa. and it requires a 2500 stall.

What about the Lunati Voo Doo cam 60203? We were just talking about that in another thread....someone said it makes good power up to 6.2k and it has a 227/233 duration, 110 lsa. and it requires a 2500 stall.

Excellent suggestion!

Thats exactly the cam range i suggested in earlier post.

As Chris stated a cam in that range will make for a nice strong streetable performance motor.

Scott

Brian,the Lunati part # for my cam is 302A7LUN

I am looking at a solid lifter cam, is that what you have Mr 4 speed?

my cam is a hydraulic flat tappet

UD Harold, if your out there can you help me with my set up. Would like to go with a solid lifter cam.
thanks
Brian

Ultradyne/Lunati has an LS6 replacement solid that has .550/.570 lift ground on a 112 LSA
Not sure of the other specs.

Having ran a 402 motor for the past two years, here's what I experienced. First, wth manifolds, go with a 112LSA (stay away from a 110LSA if you can). The closer lobe centers work better with headers and make a little more peak power, the wider LSA will have more power down low. With 3.31 gears, there is little reason to run the motor over 6000, no advantage to a solid cam. I do agree with Mr4speed, that Lunati 280/288 (223/231, 112LSA) would be perfect for 2500 stall/3.31 combo. I ran a Crane 286 (226/236, 112LSA) in my 402 motor with 10" 3000 stall & 3.73 gears, it was plenty - had a nice racey idle, plenty of power from about 2500 - 6000 in the 402 motor. If you could swing it, a jump to a hyd roller would absolutely wake up that motor. I ran the Comp NX279HR (230/242, .537/.541, 113LSA) in the 402 for a short while before switching the motor to a 460CI, going to a roller was a huge difference.

right now i am running a comp 268xe and I am not happy with it. As for the 3.31, it could change. 3.73 would be the gear I would go with. Its a matter of money and driveability.

If you could swing it, a jump to a hyd roller would absolutely wake up that motor. I ran the Comp NX279HR (230/242, .537/.541, 113LSA) in the 402 for a short while before switching the motor to a 460CI, going to a roller was a huge difference.

What kind of gains did you get from going roller?

It never got ran at the track for a fair comparison, but with no other changes other than the cam, the car behaved completely different. With the flat tappet cam, it would lay decent amount of rubber out of the hole - big deal. With the roller, the little 402 acted like a 454 motor and would put the car sideways at anything under 30 mph. Changed the whole temperament of the motor. Keep in mind, this does not come cheap.

That NX279HR cam....is that a nitrous cam?

It's like what....$600-$1000 more to convert to roller cam? And if it makes a 402 seem like you're messing with a 454.....:D

Hey I've already got the engine....a little more power never hurts, especially since I plan on keeping it since it's my first engine I assembled and I know what's in it. ;)