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Old 03-01-2006, 07:27 PM
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cam problems

I'm tring to upgrade my cam to a street/strip cam and I'm having trouble identifing the cam thats in the motor, I have not opened up the motor that deep yet for good reasons don't want to move it in pieces, so would anybody happen to know what kind of stock cam came in a chevy 350 5.7sgi 94 suppose to be out of a 4*4 blazer full size? when i look it up on like summit racing it comes up as hydo flat tappet but someone told me at a speed shop that it has a roller cam, do i have to put back in what i take out> Dont really know to much about cams just how to install then not the tech. stuff

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Old 03-01-2006, 08:05 PM
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its a hyd roller. with something like .430 lift.
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Old 03-02-2006, 04:21 PM
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so i need to go with a hydro roller cam and lifters correct
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Old 03-02-2006, 06:15 PM
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i don't know if they make flat tapets for that engine. if they do, then you can use them, WITH a compatable cam. i wouldn't

you will get more performance out of a roller cam because you can get a cam with more duration.

how much do you have to spend on the cam/lifters/etc ?
what are you looking to get out of it ?
how many miles on engine ?

if you didn't know. you going to need a computer tune to go with the cam.
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Old 03-02-2006, 06:50 PM
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I say you have a regular hydraulic camshaft since the truck line came out with hydraulic roller camshafts along with vortec heads in the 96-up models.
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Old 03-02-2006, 07:41 PM
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I have to agree with "tornado-tech". My 94' full size 4X4 Blazer has a 350 with a flat tappet cam.
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Old 03-03-2006, 03:13 PM
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I dont have a computer in my cadillac, I have switched to carb. and I dont know how many miles are on the motor because I bought it from a friend how recked his truck. But the motor is very clean inside and out, great compression. I if look up my motor on summit it gives me all kind of cams all hydro flat tappet. When I looked on mortec.com it says 350 sgi roller/non roller not very helpful.
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Old 03-03-2006, 08:16 PM
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car motors were roller and trucks used up the last of the flat tappet cams.
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Old 03-04-2006, 09:17 AM
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That would explain why it gives me a list of flat tappet cams in all the in the summit magizine. Thanks guys. Any suggestions? I was looking at a comp cam 268. with a 454 lift I believe. I'm not making a race car I just want the most power with stock springs, I want to change the push rods and rockers, and put a timing gear instead of chain...does that sound good? I already have msd hei spark being carried by accels 8mm wires, still need fuel pump and high volume oil pump
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Old 03-04-2006, 01:18 PM
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cam selection

I would opt for a better grind cam than a Comp Cams 268.
Check the compareable grinds from Crane, Lunati, etc. The Comp Cams of that size seem to come up short on lift when comparing durations, and your lift is what will give you the most for your bottom and mid range power.
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Old 03-04-2006, 02:01 PM
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Have you tried a degree wheel to see what you have currently?
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Old 03-04-2006, 05:52 PM
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" I was looking at a comp cam 268. with a 454 lift I believe. I'm not making a race car I just want the most power with stock springs, I want to change the push rods and rockers, and put a timing gear instead of chain...does that sound good?"


For nice street and piston to valve issues I've been told to keep lift around .460 and duration around 280 degrees. ( Others will have different opinions.) Why change push rods and rockers? Don't be afraid to contact cam mfg's and ask questions and follow their advice.

Timing gears can be loud and hard on the valve train. The timing chain takes up the shock of the crank changing speeds and load.
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Old 03-04-2006, 06:35 PM
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I have not pulled the stock cam yet because I have to move it to my cousins shop where all the major works go's down. but I guess I can dive in it and just try to keep things in order. I don't have an angle finder but I can get one how should I accurately find the angle and lift, and current lobe size? if I change the rockers and go with lighter rockers and rods can't that free up a little more power? I want as much power as I can afford.
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Old 03-04-2006, 08:01 PM
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Just guessing, but I don't think you have the tools or experiance to obtain the cam spec's from an installed cam. About the only way to find them is through a Chevy dealer or web site. Some Chevy magizines may have that info on a web site. Try researching it that way.
As far as extra HP from lite rods or rockers, a lot of cash for so little gain. A lot of that stuff only pays off in big buck racing motors.
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Old 03-05-2006, 11:00 AM
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right you are. I'm a carpenter and only build cars up in my spare time, but I have just basic motor knowledge, motor swaps nothing too deep into rebuilding motors, this will be my first real build.
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