Cam selection for a 360

[sasquatch]

I am in the process of putting a 360 in my 72 duster. The plan is to use kb-107 or kb 190 pistons to raise compression. It will have stock rods, crank, etc. Dual plane performer or stealth intake, 700 or 750 carb, headers, and 3.55 or 3.23 gears. I will be using a 904 with the converter yet to be determined.

I really dont have much of an idea of how to select a cam, but I know someone with a similar 360 with stock compression that has the comp xe268 that he likes a lot. I was looking at a lunati voodoo 60403, but I don't know how much lift I can have on stock heads. I want to stay with a hydrolic flat tappet.

here are the cam specs:

• Advertised Duration (Int/Exh): 268/276
• Duration @ .050 (Int/Exh): 226/234
• Gross Valve Lift (Int/Exh): .494/.513
• LSA/ICL: 110/106
• Valve Lash (Int/Exh): Hyd/Hyd
• RPM Range: 1800-6200

Part Number: 60403

Thanks for your input!

 

[sasquatch]

I forgot to ask the question after writing all that background...lol. What do yall think of this cam? Are there any other suggestions? What components would I need to change besides lifters and probably springs?

Thanks

 

[Brian Hafliger]

I am in the process of putting a 360 in my 72 duster. The plan is to use kb-107 or kb 190 pistons to raise compression. It will have stock rods, crank, etc. Dual plane performer or stealth intake, 700 or 750 carb, headers, and 3.55 or 3.23 gears. I will be using a 904 with the converter yet to be determined.

I really dont have much of an idea of how to select a cam, but I know someone with a similar 360 with stock compression that has the comp xe268 that he likes a lot. I was looking at a lunati voodoo 60403, but I don't know how much lift I can have on stock heads. I want to stay with a hydrolic flat tappet.

here are the cam specs:

• Advertised Duration (Int/Exh): 268/276
• Duration @ .050 (Int/Exh): 226/234
• Gross Valve Lift (Int/Exh): .494/.513
• LSA/ICL: 110/106
• Valve Lash (Int/Exh): Hyd/Hyd
• RPM Range: 1800-6200

Part Number: 60403

Thanks for your input!

You'll need to have the tops of the guides cut down some...safer that way. Just run a good single spring w/dampner with I.H. pressure of 120-125lbs. and open pressure @.500 around 310-325lbs.
That cam will work just fine!

 

[moper]

Brian, nice to see you here.

 

[Brian Hafliger]

Brian, nice to see you here.

Thanks!!

 

[sasquatch]

Thanks ou812.

 

[sasquatch]

I called up comp cams asking what they would recommend, and they said the xe 274. Are there any opinions which one to go with?

here are the xe 274 specs:

Basic Operating RPM Range 1,800-6,000
Intake Duration at 050 inch Lift 230
Exhaust Duration at 050 inch Lift 236
Duration at 050 inch Lift 230 int./236 exh.
Advertised Intake Duration 274
Advertised Exhaust Duration 286
Advertised Duration 274 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.488 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.491 in.
Valve Lift with Factory Rocker Arm Ratio 0.488 int./0.491 exh. lift

 

[crackedback]

Flip a coin. They are pretty close in size/grind.

 

[C130 Chief]

You'll want the Performer RPM rather than a regular Performer intake on a 360.

Either cam should make enough power to kill the 904.

 

[qkRick]

Hey Sasquatch,

A guy on MoParts nd65 has a set of KB 190's in the smallblock engine parts for sale section. Love those 360's

 

[Brian Hafliger]

You'll want the Performer RPM rather than a regular Performer intake on a 360.

Either cam should make enough power to kill the 904.

I love my 904...4000rpm off the brake and after every year it looks brand new inside! Been running it now almost 6 years.
If you kill a 904 your doing something wrong!!

 

[Brian Hafliger]

I called up comp cams asking what they would recommend, and they said the xe 274. Are there any opinions which one to go with?

here are the xe 274 specs:

Basic Operating RPM Range 1,800-6,000
Intake Duration at 050 inch Lift 230
Exhaust Duration at 050 inch Lift 236
Duration at 050 inch Lift 230 int./236 exh.
Advertised Intake Duration 274
Advertised Exhaust Duration 286
Advertised Duration 274 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.488 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.491 in.
Valve Lift with Factory Rocker Arm Ratio 0.488 int./0.491 exh. lift

If you use a 3.55 gear, short tire, 750DP, rpm intake and at least 1 5/8 headers then the XE274 cam will make more power and pull longer than the Voodoo cam.
If you go the other route i.e. 3.23 gear, 700 carb, and perf. intake then the Voodoo cam will out perform the comp.

 

[sasquatch]

Thanks for the help!

 

[Snake]

Now is he going to have to get different push rods and adjustable rockers.Pretty much everone here said I would have to ,just to get the right preload.Mine has a small tick with the 280 480 comp cam.

 

[Brian Hafliger]

Now is he going to have to get different push rods and adjustable rockers.Pretty much everone here said I would have to ,just to get the right preload.Mine has a small tick with the 280 480 comp cam.

I've used stock valvetrain in both sb's and bb's with the 268 cam. After that it's either adj. pushrods or change the rocker gear.

Your small tick could be not enough preload, or it could be a lifter not pumping up like it should...if it's the latter, it needs to be replaced.

 

[dart76]

I run kb 190 in my car and a crower .485 -.495, has real strong mid range.

 

[mullinax95]

Just curious everyone.

I have been told to preload the rocker 1/4 of a turn and have seen on Comp cams that it suggests 1/2 of a turn.

What do you use?

 

[JoeDust451]

Just curious everyone.

I have been told to preload the rocker 1/4 of a turn and have seen on Comp cams that it suggests 1/2 of a turn.

What do you use?

Running the conventional style lifters like the high energys, alittle more preload wouldn't hurt, but i would still limit it to around 1/4 turn, or in-between a 1/4 & 1/2, i run the pro-magnum anti pump-ups in my mopars when running an aggressive cam, there designed with a different plunger & use a C clip for setting less preload, you can even set them at 0, this allows you to run higher rpms without running into lifter bleed down.

 

[moper]

Marland,
I measure the preload if it's a new engine. If not, start at 1/2 turn for stock type lifters and 1/4 for anti-pump ups.

 

[mullinax95]

Marland,
I measure the preload if it's a new engine. If not, start at 1/2 turn for stock type lifters and 1/4 for anti-pump ups.

Well it sounds like I need to go another 1/4 turn then. The engine has less than 5000 miles on it but the cam has been around a while. It has new hydro stock type lifters.

 

[moper]

depending on the thread count, one turn is about .040", so 1/4 turn is only about .010".

 

[sasquatch]

Which of the two cams, the lunati 60403 or the comp xe 274, would require the least amount of work/money? I have never installed a cam before, so i don't know how difficult it is to shave the guides or change the push rods. I would rather not have to spend to change the rocker arms, like snake said I would need to with the 274.

 

[Snake]

Someone answer him

 

[moper]

The 60403 needs a spring with 120lbs on the seat but 205 over the nose (that's max lift of .500 at the valve with this cam). In oder to get that from a single spring you need to go behive. Comps part number 26995 would work for either cam but need the guides trimmed. In a std spiral wound spring both cams need a dual assembly which means cutting the spring seats, and the guides for positive seals and clearance.