what do you guys think about this cam rec

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SB75SM

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What do you guys think about this one? This is what I got back from bullet cams. All stock 70 340.

GRIND CRA266/266F108+4
DUR @ .050 239/239
LIFT .536/.536
LSA 108
INT C/L 104

THANKS RICHARD
> Cam Type Interest: Solid
> Cam Used For: Street/Strip
> Track Length: 1320
> Class:
> Engine Make: chrysler
> Year: 1970
> Cubic Inch: 340
> Bore: 4.04
> Stroke: 3.31
> Block: factory 340
> Intake Valve Size: 2.02
> Exhaust Valve Size: 1.60
> Rocker Ratio Intake: 1.5
> Rocker Ratio Exhaust: 1.5
> Porting: None
> Compression Ratio: 10.5
> Carbureted Or Injected: Carbureted
> Carbureted CFM: 630
> Number Of Carburetors: 1
> Fuel: Gasoline
> Cast Iron Manifold: Yes
> Vehicle Weight: 3400
> Vehicle Make & Model: dodge challenger
> Transmission Type: Automatic
> Transmission Number Of Gears: 3
> If Automatic:
> Stall Speed: 2500
> Rear Axle Ratio: 3.91
> Tire Height: 27.1
> Tire Width: 10
> Is This A New Combination: No
> Current Cam: Hydraulic
> RPM At Gear Change: 4750
> Where Is Improvement Needed: Everywhere
> Idle Quality Desired: NotImportant
 
That's a heck of a lot of lift for stock 340 heads. Most stock heads I've seen won't handle over 475 lift. You usually have to have the valve guides cut down so the retainer doesn't hit it and for dual valve spring clearance which I'd bet that cam calls for. Other than that it should work good once you hit the sweet spot which will probably be about 3000-3300 rpm. IMO it's a little big for a 2500 stall converter in a 3400 lb car.

Just noticed that according to your spec sheet you want to shift it at 4750 rpm. If that's the case it's way too much cam. In a 340 I bet it'd easily spin 6000. rpm
 
That does seem like a lot of cam for a stock 340. That is very similar to the Bullet cam I just sold, but I had a 416 setup with W2 heads.

247 @ .050 intake
251 @ .050 exhaust

.559 intake
.540 exhaust

107 LSA
103 installed

Sounded like this

[ame="http://www.youtube.com/watch?v=N4LWwP4tkfo"]Dart rolling out - YouTube[/ame]
 
That is a decent cam, is it solid or hydraulic?
 
Looks good to me. Mark and Tim are a couple of the sharpest guys at specing cams out there. Keep in mind that solid cam duration @ 0.50 numbers are around 8* - 10* larger than a equivalent hyd. This would be like running a 230ish hyd cam. The lift will also be around .500 after lash, deflection, and the SB Mopar angle loss. As with all motors you will need to check/measure everything.
 
I like it except for two things. Like Tracy brought up, that's a lot of lift for stock heads. Make sure you have enough retainer to guide clearance. Also, is this a street car? You will like it a lot better I believe ground on a 112 if it is. Much better manners stronger vacuum signal, flatter torque curve. JMO.
 
What's lash .022-.026"? That would drop it closer to the .510 zone. I would like more converter myself. Distributor curve and tuning will help considerably.
 
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