Hey Guys,

Would like your opinion on a new cam for my car. The car is a '69 Charger, '69 440, 4-spd, 3.54 Dana, 295/50/15 tires. Engine is running factory carb, intake, 906 heads and exhaust manifolds with stock exhaust system with repro hemi mufflers. Compression is 11.26:1, heads cleaned up with larger exhaust valve. Other than that, pretty stock.

What I'm looking for is a cam that will enable the most performance from the engine given the restrictions of the stock carb, intake and exhaust. Also, being a big heavy car with a 4-spd. I don't care about how it sounds, just how it runs.

Looking for single bolt, hydraulic cam for stock rocker assy.

Thanks in advance for any suggestions!

better get some race gas for that compression & iron heads

Are you sure about that compression ratio? That's a lot for iron heads.
If you were at 9.5:1 with iron, or 10.0 with aluminum, I'd say the Engle cam I put in my 446" 440 - 4speed, 3.55s, taller tire, '63 Savoy wagon - would be great. It was 224/234 @ .050, lift was around .504/.512, 110 CL. Well-behaved, nice street cam, not too rumpity, fine with 92 octane. That car ran Eddy heads and the full Maxie exhaust system, single 850 Holley, 10.0:1 actual CR. You can find the lobe specs at their website.

That is a hand grenade with the pin out waiting to tossed into chaos causing destruction
Trust me on that, your messing with the big hurt with that much compression on todays pump gas

Yes, I run race gas in it. It's 11:26 compression.

The Crower HDP282 grind (PN 32243) would be a good match for that combo. It is a "manifold friendly" profile and works fine with restrictive exhaust and factory heads with stock valvetrain.

https://www.crower.com/camshafts/mopar-350-440-b-compu-pro-hydraulic-cam-282-hdp.html



Ron

Thanks Ron, I'll check it out!

Your intake is by far your performance limiting factor. Will you be modifying it in anyway? Bob K. cam or something like the Crower 271 is what I would probably look at.

I had not thought about modifying the intake. How do you mean, modify it? By Crower 271, do you mean the 32241?

Thanks!

You'll need to consult with a professional or someone that has done some testing with FAST cars. I would think that milling out the dividers,add a 1/2" spacer and an 800 cfm Eddy AVS would make a meaningful difference.

32242.

So you left everything pretty stock but bumped up the compression a bunch. You changed pistons for sure to do that, if you didn't, you don't have 11.26 comp.

But with that said, with all the stock parts you are using there are a bunch of cams you could use. With the biggest restrictions stock intake and exhaust and 906 heads id go with a cam around 238* @.050 around .500 lift on a 108LSA. Any bigger and she will feel like a dog around town.


If you did change your pistons and have a true 11.26 , im not sure I would go much bigger then that either, because of the stock manifolds and intake. If it were a automatic with a vert, I would say you could go a little bigger.

if you want to go that large ^, you could try this comp cam, perhaps it's an updated purple shaft grind...

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=718&sb=2

I think you could run a little extra duration with that compression but i'd spread the lobe separation a little too.

That’s what I was thinking.

I did a bunch of testing on that stuff 8-10 years ago.
As Russ said, the stock intake is really a cork.

Stock 906 head @.500 lift = 226cfm
Bolt on stock intake manifold = 189cfm
Mild clean up stock intake = 195cfm
Mild clean up 6bbl intake = 217cfm

Mild ported 346 head @.500 lift = 259cfm
With stock intake = 202cfm
Mild clean up stock intake = 212cfm
Mild clean up 6bbl intake = 242cfm
Gasket matched RB M1 single plane = 255cfm

The stock head with the cleaned up 6bbl intake outflows the ported head with the cleaned up 4bbl intake.

I have a Erson e410421 in a 70 4speed charger RT with stock intake, heads, and kb 236's Its been 12.60's at 108 with 26in slicks bolted on, and the 8-track blasting Foghat. The cam idles with a nice lope, but not to crazy. I know it's technically a Chevy grind but with .472 lift it fit right in with no extra work.

Yes, long story short, after replacing pistons, decking block, surfacing heads, the engine builder used a thin head gasket and that's what the compression wound up at. It's had the heads cleaned up with mild porting. It is already assembled, but needs a new cam due to cam bearings not being installed correctly resulting in oil starvation. So, this is not a new rebuild. I'm keeping it stock externally. I don't know that the cam that was in it previously was the right choice given the engines restrictions, so just wondering what your recommendations are. Thanks for all the input!!

Could you give me an example of what you think would work?

Thanks!

Purple shaft hemi grind

It's to bad you can't buy one new, they would wake up a stock motor.

If this has already been suggested by anyone before me, sorry for the duplication.

My $.02 (ignoring the CR being way too high for pump gas):
- A singe-pattern 220-224 at .050, or only a 2-4 degree split on the exhaust
- LSA 112-114 since the exhaust system is sub-par and you don't want too much overlap

I don't see the need for extra exhaust duration cuz it's not gonna want to rev anyway with the restrictive stock top-end stuff. It'll probably start running out of breath around 5000 RPM. If you upgraded to a 6-bbl setup, then the extra exhaust duration could help some.

Keep all the torque you can for the heavy car and long gears. You can't "crutch it" with a performance converter's higher-than-stock stall, which requires a fairly small cam to retain decent low-speed drivability and throttle response.

It'll be nicer to drive in general, even if it MIGHT give up a few HP at peak power. This could be one of those combinations were a bigger cam won't do anything but LOSE torque across the usable RPM range, gaining you nothing.