Input on cam choice for 500ci

[Heimedw]

Hi guys looking for some input on cam choice? I'm going to be building a 500ci B motor this winter and would like some input on what cam would be best. I'm going to buy good parts looking at Indy 440 sr heads full roller valve train hydraulic roller cam performer rpm duel plane 850 or 950 quickfuel. I'm looking for a bad weekend and cruise night car so that's why I'm having a hard time picking a cam!? I do know the big cube wedge engine like big cams but I still want a car that will start and have a decent idle. I know even with a big cam the cubes will make up for it down low and still make a lot of torque with a big cam but would like some input. I was thinking the comp 242 248 at .50 549 544 lift or the big baby 252 258 at .50 571 lift. Both at 110 lop. Ow I'm running a 727 and 342 rear diff. I turn 2500rpm at 60mph

 

[1967coronet440]

Whats the compression? Best bet would be to call a cam specialist. Dwayne porter, comp will custom grind you a cam, isky. Etc

 

[Heimedw]

Around 10:5:1. I wanted to add that I want to run the performer rpm duel plane to keep the sleeper look. It will be getting some port work!

 

[68 HEMI GTS]

You may wanna check out my build, it was similiar

https://www.forbbodiesonly.com/moparforum/threads/roadrunner-8-4.101032/

 

[Heimedw]

68 hemi gts what is the car like to drive in the street? I see you went with a bigger cam than I'm looking at.

 

[68 HEMI GTS]

Drives around like a 12 sec car. The extra cubes eat the duration up. Granted the idle vacuum is still a bit low so it took some tuning to get it dialed. I have a PTC converter in it now (TCI broke) that is probably just a little to tight. Drives great though, I put lots of miles on it. The PTC converter slowed it down to 11.0’s.

 

[wyrmrider]

get your head flows
going to have tight quench?
http://jonescams.com/street-performance/ for roller or FT

 

[68 HEMI GTS]

get your head flows
going to have tight quench?
http://jonescams.com/street-performance/ for roller or FT

Hope Jones pays you for the non stop endorsement

 

[wyrmrider]

I knew their dad
apples did not fall far from the tree
you just can't do any better
just looking at the cam card for my motorhome cam
15 61 61 15 256 duration .461 lift .030 at TDC 113LCA
264 @ .004 SAE style
120 @ 200
83 @ .250
64 @ .275
compare with the 248 Mopar Performance grind which has about the same seat duration
This cam has 50% more duration at .275 (64) Than the MP 260 (42) with the seat timing of the 248

with a chevy cam I would be lucky to get .420 at that duration and virtually nothing at .275 where you really need it
so show me a better spec for a torque cam
do I need to explain the mechanics and physics of an inverse radius profile to you?

See Circle Track MAgazine April 1987

 

[wyrmrider]

OK here is a typical Chevy grind on a Mopar core like you can get from a mail order retailer
This one happens to be Melling but available under lots of different names
We'll use SAE method for duration (.006 at the valve with 1.5 rocker = .004 at the cam)
as I said above the Jones cam is 264 degrees SAE
For a very similar duration at .050
the Melling is 278 SAE - 14 degrees bigger while only giving ..280 cam lift vs 305 for a big .420 lift vs .461
Timing on the Melling is 27-71 76-32 at.004/ SAE for the dual pattern version (112) and 28-70 68-30 for the single pattern version (110)
to get over .460 lift with a Melling Cam you have to go to a 298 SAE degree cam with an intake close at 81 degrees ABDC SAE (the ever popular [email protected] cam)
now tell me again which one is going to have the most area under the curve
which is going to work best with a 9:1 or less motor
I guess you would advance the Melling 10 degrees or 20 degrees for the 214 cam- now how would that work?