383 hp stock cam question.

[BeepBeepRR]

Well today I took apart my friends 383 HP and discovered that the rear lifter and cam lobe are wasted. I was told by the guy who built the engine that it was a stock grind Cam. My question is what is a good cam to get and still retain stock pushrod length and valve springs. Just paid for new lifters and pushrods. And don’t want to have to upgrade the valve springs. Any input would be appreciated.

 

[PRHeads]

Here are 4 drop in options:

-Howard’s 720031-12
-the smaller Summit cam
-Comp 21-215-4
-sealed power CS661(this is the stock replacement HP cam)

Make sure you check the lifter rotation for that lifter position with the new cam, and use some good break in oil.

 

[fratzog lover]

Have one custom made. .450/.458, 213/225. Or the Mopar grind 221/221, .455/.455 isnt a bad choice either. Stock manifolds or headers?

 

[4mulas]

I just used the 6401 summit cam. .468 and .488. Mind you I have eddy heads. What valve springs do you have in your heads now?

 

[BeepBeepRR]

Have one custom made. .450/.458, 213/225. Or the Mopar grind 221/221, .455/.455 isnt a bad choice either. Stock manifolds or headers?

1 7/8 headers

 

[BeepBeepRR]

Pretty sure they are ported, but they are 906 heads. Headers 1 7/8 summit headers. Valve springs I have no idea but the push rods are stock length.

 

[PRHeads]

If it has headers, then I’d prefer that Comp 268H.

 

[4mulas]

Pretty sure they are ported, but they are 906 heads. Headers 1 7/8 summit headers. Valve springs I have no idea but the push rods are stock length.

Do you have single, single with damper, or double springs on the 906’s ?

 

[BeepBeepRR]

I will have to look when I go back. I think I’m going to pull the engine and just go through it. Since that lobe was wiped so bad I’m sure a crap load of metal is in the pan. I will have more details when I get it here to the house.

 

[BeepBeepRR]

Chose to purchase a Howards Street Force 2 cam as it is pretty close to the "roadrunner cam" This is what I am getting. Another question is will a 2500 stall be too much for this cam? I will be pulling the engine this coming week and I plan on a complete tear down and rebuild. Just to make sure everything is in good shape. Also The engine was kind of a mystery engine and we never knew what it was made of. This way I can see what type of pistons ie Standard or Bored etc etc.. Might be my friend to CC the chambers so that we can see where the engine is from the start.

Brand:Howards Cams

Manufacturer's Part Number:720031-12

Part Type:Camshafts

Product Line:Howards Cams Street Force 2 Hydraulic Flat Tappet Camshafts

Summit Racing Part Number:HRS-720031-12


UPC:840793115327

Cam Style:Hydraulic flat tappet

Basic Operating RPM Range:1,400-5,200

Intake Duration at 050 inch Lift:215

Exhaust Duration at 050 inch Lift:223

Duration at 050 inch Lift:215 int./223 exh.

Advertised Intake Duration:269

Advertised Exhaust Duration:277

Advertised Duration:269 int./277 exh.

Intake Valve Lift with Factory Rocker Arm Ratio:0.446 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio:0.465 in.

Valve Lift with Factory Rocker Arm Ratio:0.446 int./0.465 exh.

Lobe Separation (degrees):112

Camshaft Gear Attachment:1-bolt

Computer-Controlled Compatible:No

Valve Springs Required:Yes

Camshaft Manufacturers Description:Good idle and throttle response. Needs 4-barrel and good exhaust.

 

[BeepBeepRR]

Here is some information I found on the web.

The 1968 ~ 383/330 HP and 383/300 HP 'Super Commando' Camshaft

Lift............. 431"/.443"
Duration.... 256*/260* Duration
Overlap..... 32* Overlap

Valve Springs........ #134 lbs. Valve-Closed / #208 lbs. Valve-Open

Available in the........Barracuda, Belvedere, Satellite and Sport Satellite

-------------------------------------------------------------------------------------
The 1968 383/335 HP 'Road Runner' and 440/375 'Super Commando'
utilized the same Camshaft.

Lift............. 450"/.458"
Duration..... 268*/284*
Overlap....... 46*

Valve Spring Load-Rate....... #129 lbs. Valve-Closed / #250 lbs. Valve-Open

The Stock Valve Springs should be a 'dull' red in color.

 

[qkcuda]

The Summit cam has almost the same specs as that Howard's. It also seems to be identical to the sealed power cam. At that price I was looking at ordering the cam and kit for my 66 Charger. Does anyone know why it says the lifters will only work on 68 and later engine?

 

[BeepBeepRR]

The Summit cam has almost the same specs as that Howard's. It also seems to be identical to the sealed power cam. At that price I was looking at ordering the cam and kit for my 66 Charger. Does anyone know why it says the lifters will only work on 68 and later engine?

Are you talking about the K6401 cam or the K6400?

 

[qkcuda]

The 6400

 

[BeepBeepRR]

The 6400

OK I was just looking at that.. Although I dont know what Valve springs are on the heads. This cam says it requires springs. I need to go back over there or wait until I get the engine here to check this out. I do have a picture I took a while back but the angle doesn't show if they are double springs or not.
Here is the picture but Hell I can't tell what springs are on the head. Maybe someone else can tell.

 

[Curiousyellow71]

The Summit cam has almost the same specs as that Howard's. It also seems to be identical to the sealed power cam. At that price I was looking at ordering the cam and kit for my 66 Charger. Does anyone know why it says the lifters will only work on 68 and later engine?

If I am recalling right 67 and older bb use little different lifter so the pushrod is different. But if you run the later pushrod you should be good.

 

[qkcuda]

If I am recalling right 67 and older bb use little different lifter so the pushrod is different. But if you run the later pushrod you should be good.

Thanks, that wouldn't be a problem.

 

[wyrmrider]

on the 383 whats your cr and other details like gears etc
how can suggestions be made without that basic info
Lunati voodoo has good shelf cams
sure a bunch of suggestions on how to dumb down your mopar to a chevie...
street farce
summit
etc
currious has the correct answer use newer lifter and pushrods mopar improved for a reason

the street farce is nothing like the stock cam

 

[BeepBeepRR]

Yea

on the 383 whats your cr and other details like gears etc
how can suggestions be made without that basic info
Lunati voodoo has good shelf cams
sure a bunch of suggestions on how to dumb down your mopar to a chevie...
street farce
summit
etc
currious has the correct answer use newer lifter and pushrods mopar improved for a reason

the street farce is nothing like the stock cam

I understand this, but the 383 has always been a mystery engine. The only thing I got out of the guy it came from that it was a mopar "roadrunner cam" So when I get it here I will be able to take it apart and get more into what the engine is made of. For all I know it could be a standard bottom end. I will know more and probably wont buy a cam until I tear it down and inventory what is there. BTW Great point. Others were asking the questions but not knowing makes it hard to answer. Other than the obvious stuff like headers, 4barrel, 906 heads etc etc.

 

[wyrmrider]

The stock roadrunner / 440 Magnum springs will be a single spring with a flat damper, not dual round wire springs unless someone changed them
other spring combos include outer round wire, flat damper, inner round wire-- but I'm not holding my breath
the stock road runner cam is [email protected] to compare with Comp, Lunaiti, Howards
and and around 300 if you want to compare with Summit/ Crane/ Cam dynamics/ sealed power/ Melling but if you put in a 292 0r 300 aftermarket cam it would be a completely different beast
most of this duration is in extremely long closing ramps. the long intake close kills dynamic compression and the long exhaust dilutes the intake charge giving a big EGR effect- great for smog not so good for power or mileage especially if it has rebuilder pistons in it
dbl check that head casting number for starters and measure your deck height at all four corners before you take the pistons out
great idea not going on a cam search till you know your true measured compression and approximate head flows, exhaust etc etc