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  #16 (permalink)  
Old 06-10-2010, 07:27 PM
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Sorry guys, I work out of town during the week and stay in a hotel and the internet was down at the hotel, It is a stock camshaft for a 1993 Chevrolet K1500 5.7 liter with 3.48 gears. The only thing I have for specs on the engine is from my Chilton manual which is as follows:

210 Horsepower at 4000 rpm
300 torque at 2800 rpm
8.5:1 compression which I have maintained maybe went up to 8.75:1
The camshaft is supposed to be a stock replacement cam, the cam number is MC-274, according to my Hayes manual the lift is intake .2565 exhaust .2690.

To know the cam timing would I have to degree the cam? If so then I don't know what the cam timing is.

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  #17 (permalink)  
Old 06-13-2010, 05:56 PM
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I have the engine together now and it is ready to go into the truck. Is the stock cam really that bad of a cam? I am putting this subject to rest now, I feel bad about this thread. I have been trying to get somebody to select a cam or send me in the right direction at least. I know it is hard to do because everyone likes different things.
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  #18 (permalink)  
Old 06-14-2010, 05:52 AM
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Your stock "swirl-port" cam is like many stock emission compliant cams, it is a compromise. The OM has to deal w/emissions, fuel economy and driveability. The problem comes when the cam is changed and it is outside the approximate 10% window the ECM has available to it to compensate.

I don't know if there has been anyone here who has tried to match up an aftermarket cam to the stock heads and ECM you have. But likely, the intake duration would be at or below 200 @ 0.050", the exhaust perhaps 4 more. Lift would probably be in the low 0.400" range.

Increasing the rocker ratio might get you a HP or five, if you feel you just have to do something. Clearances for the push rod to the head slot needs to be verified.
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