Another cam question 361

[qkcuda]

I am a believer in wide lobe separation on the street. When I ran the stock stroke 400 I used a Crane HMV278. It had 222/234 duration and 467/494 lift with 114 lobe separation. It idled great and made 415 HP and 450 torque, and ran high 12's. A little too big for this build though.

 

[qkcuda]

That little voice in my head keeps pushing me towards the 701 cam. Does anyone know at what point retainer to guide clearance becomes an issue on a big block head? I'm guessing that 475 lift is not an issue, because a lot of guys used to run street hemi grind cams on otherwise stock engines back in the day.

 

[Don Frelier]

My 66 Plymouth has the closed chamber heads with a Mopar .484 cam.
I didn't put it together but it has no valve train issues.
You might want to consider the 700 Lunati.

 

[Darter6]

Ran a Mopar .509 cam in a stock 69 440 without any problem.At the time Ma Mopar stated that was the largest before retainer to guide would be a problem. I believe you are correct that a .475 will not be a issue.

 

[TrackPack]

I had clearance issues once with a MP 484 cam. Steel shim gaskets, and I think that block wasn't the typical height usually seen from the factory.

 

[wyrmrider]

that 278 @.004 crane is going to have a litte more seat duration as a 268 comp @.006

 

[Bighead440]

I am a believer in wide lobe separation on the street. When I ran the stock stroke 400 I used a Crane HMV278. It had 222/234 duration and 467/494 lift with 114 lobe separation. It idled great and made 415 HP and 450 torque, and ran high 12's. A little too big for this build though.

I like the 272HMV (.454/.480"-112*LSA) in a 383 as is or 400 with head milling. My fave for "sound" is the Comp 265DEH (219/235*@.050-110LSA) and it works good with exhaust manifolds and an 11" factory hi-stall converter. Haven't tried the Crane 278HMV but I can see it being better at RPM. The big Summit cam worked good way back in a 383 A-body with 3.55 gears for a friend on a limited budget. I used a MoPar 260/.430"/113LSA PurpleShaft in my old '71 Sport Fury 383 2bbl (cast crank!), that I also upgraded to a '72 400HP intake and TQ from a police cruiser Fury. Ran excellent and pulled that heavy tank with 2.76 gears just fine! I think this same basic cam is offered by Howards as their "365hp 426W replacement cam" and Crane (others?) also offered it (260/.430"/113LSA). Basically a 361 with 9:1 advertised compression should tolerate that 260/.430" the same as a 400 with 8:1 advertised, I would think.

 

[Aeronet]

I think the Howards American Muscle 260/.430/113 cam is "their version" of the '72 up factory standard engine cam.
I too am looking to step down from "street hemi" cam in a '72 400 to something more cruise friendly. I think I'm going with the Lunati Voodoo 700 cam. It looks similar to the MP 260 purpleshaft cam. The 701 Voodoo has more lift than I want.

 

[Bighead440]

I think the Howards American Muscle 260/.430/113 cam is "their version" of the '72 up factory standard engine cam.
I too am looking to step down from "street hemi" cam in a '72 400 to something more cruise friendly. I think I'm going with the Lunati Voodoo 700 cam. It looks similar to the MP 260 purpleshaft cam. The 701 Voodoo has more lift than I want.

You'll probably love the Crane 272HMV, it really sounds/runs great in a 383 or 400 (short stroke)engine with excellent driveability/vacuum. The Comp 275DEH is punchier in the midrange and a good bit more aggressive at idle, if that's desired. I thought the base 290hp 383 2bbl and 440 350hp used an even smaller cam than the 426w/365hp? I knew it (Street Wedge) didn't use the 375hp 383/ 375hp 440 cam.

 

[Aeronet]

I think the '72 up standard engine cam superceded all previous standard engine cams. As far as I know, if you try to find a standard engine cam for, say, a '67 383 you will find that something like a Sealed Power CS-327 is all that is available.
Thanks, I'll look into the Crane 272 HMV.

 

[qkcuda]

"My goal would be an honest 300 horsepower and as much torque as possible, which will cruise at 2000-2500 rpm (depending which gears I use) and get decent gas mileage. I just sold an 11 second street car, now I want a cruiser."

I have to remember what I said I was after, and if I am honest, then the Voodoo 700 is probably the right choice. The 701 to me is like a modern version of the roadrunner cam. I have to remember that the roadrunner engine had more compression, better heads, better manifolds, larger exhaust, better convertor, not to mention 22 more cubic inches.

 

[Aeronet]

I think you're right. The Voodoo 700 has a little more duration than a standard cam, but with more area under the curve. Wyrmrider posted the intake closing for the 700 cam; 51 ATDC (?).
One concern I had about Voodoo cams was if they are "fast rate" cams. Apparently they aren't. I don't want noise or premature wear.

 

[qkcuda]

I was told at one time they are fast rate cams, but have asymmetrical lobes, so they raise the valve quickly and put it down more slowly. I was told the fast rate comp cams put the valve down quickly and that causes a lot of the valve train noise.

 

[Aeronet]

Just as a side note, I've been driving my '73 Charger with the 400 (street hemi cam) and 2.76 gears to work. It's mostly highway. Cruise speed is normally ~2300 rpm at 65 mph. Well, in these days of The Virus apparently law enforcement isn't stopping speeders so my cruise rpm has risen. Even so, 3200 is sufficient to outrun all but the most dedicated speeders, though I now usually run about 2400- 2600 rpm to keep up.
I think the Voodoo 700 would perform just as well or better than my current cam.

 

[Aeronet]

I was told at one time they are fast rate cams, but have asymmetrical lobes, so they raise the valve quickly and put it down more slowly. I was told the fast rate comp cams put the valve down quickly and that causes a lot of the valve train noise.

I don't want a Comp cam. They have some that look nice but....what you said.

 

[qkcuda]

It would be interesting to know where the 700 would make peak torque, but then again that probably depends upon a lot of different factors.

 

[Bighead440]

"My goal would be an honest 300 horsepower and as much torque as possible, which will cruise at 2000-2500 rpm (depending which gears I use) and get decent gas mileage. I just sold an 11 second street car, now I want a cruiser."

I have to remember what I said I was after, and if I am honest, then the Voodoo 700 is probably the right choice. The 701 to me is like a modern version of the roadrunner cam. I have to remember that the roadrunner engine had more compression, better heads, better manifolds, larger exhaust, better convertor, not to mention 22 more cubic inches.

I ran that same "701" grind in a 360LA with a Magnum head conversion, but staggered the rockers 1.6 intake, 1.5 exhaust. I was very pleased. The Mag heads bumped the compression some over regular LA heads, but it had cast replacement dished pistons and no milling of the decks and a few thousandths off the heads to true them only. Cylinder pressure might be about the same as what you'll have.

 

[Bighead440]

I think the '72 up standard engine cam superceded all previous standard engine cams. As far as I know, if you try to find a standard engine cam for, say, a '67 383 you will find that something like a Sealed Power CS-327 is all that is available.
Thanks, I'll look into the Crane 272 HMV.

To compund things even further-LOL, Lunati offers that same cam (272HMV) under their "Street Avenger" white box series, same specs: https://www.cnc-motorsports.com/102...k-avenger-hydraulic-flat-tappet-camshaft.html

AND Lunati offers this "Factory Performance" cam too, that's very similar:https://www.cnc-motorsports.com/102...rformance-hydraulic-flat-tappet-camshaft.html

 

[qkcuda]

The first one is quite similar to the 701. The second one is almost a copy of the factory roadrunner cam with long slow ramps, and more overlap.

 

[qkcuda]

Found my old Edelbrock catalog last night and checked out their performer plus cam. At 204/214 and 420/442 it is fairly similar to the 700 but a little smaller, so at least good for comparison purposes. Here is the spec sheet, it is about the middle of the page.

They also included a graph showing the torque increase. Max torque at 3000 rpm and really fat on the bottom end. If the 700 produces similar results, it looks like just what the doctor ordered.