What is the biggest size cam i can put in my lt1 camaro z28 engine?

Question:
its the factory lt1 5.7 engine

Answers:

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I own a shop, and have built racing engines for years. The answer to your question really depends on what you are going to do with the engine, and more importantly what kind of transmission & rear end gear you will have behind it. I don't agree with a cam making more horsepower as much as I would more torque. Torque is what moves the vehicle, and one must have as much torque as they do horsepower. An example would be; a 350 can make 400 horses, but 200 pounds of torque. The best street grind would be, what one calls a 3/4 cam. Any more, and you may slow the car down. Where you want to bring this torque in at, means everything. You wouldn't want all your torque to come in right away, and then fall on its face at the end of a 1/4 mile. A full race cam brings things in at high speeds as in top end. The reason most street grinds fall into this 3/4 cam area is; you don't drive most of the time wide open, so you must have something that will cross between having power on the low end, and the top end. If you are going to run a circle track and keep the foot to the floor most of the time, then you will need a full cam. A full means all the lift and duration you can get into the engine. Of course this would not be streetable. You wouldn't have any vacuum for your power brakes, or to evacuate the oil pan for that matter, so it would sling all the oil out of the engine.
The best advise one can give you is; Decide what you will do with the engine, and contact a cam manufacture such as
www.cranecams.com and talk to a technical person. Lift and duration can be confussing. This is why its best to leave this to the pros who make these cams. Biggest is not always better, and you do want to drive on the street with your car don't you? Then don't guess at it, and talk to Crane. They are best equipped to answer your questions, but be prepared to supply them with a lot of information. Believe me, you will be way ahead of the game by doing it this way.
Glad to help out, Good Luck!

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i own a shop and when you talk about cams basically all your talking about is lift and duration,that's it the bigger you go the more horse power you willl loose on low end, if its a low compression engine,so you need to ask at any performance store what size you can put in it without killing it,too big of a cam and it will be all sound,and no guts,but id ask them at a performance store they wil know which size you can add without killing it,good luck.

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You definitely sacrafice driveability by going with a heavy (big) cam. You need to honestly look into what you want the car to do - the ultimate goal - and get a cam based on that. For instance, if you want to run nitrous, you need specific cams. If you want to run a turbo/super charger, you need specific cams. If you want all engine, you can run pretty much anything. If you want it to be streetable, you become limited in your cam search again. All these factors need to be considered, and the only person that knows the answer is you. Once you determine what you want to do with the car, you can go about selecting the right cam. I'd really recommend talking to a professional though, as they will need a load of info about your car. It is for the best though. You definitely want the right setup with the cam on the first go. They aren't cheap to install and tune for (yes, you will need a dyno tune after installing a new cam).

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Check into Crane Cams and Thunder Racing. I've dealt with both and have had great experiences with both.

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Call either Comp Cams, Crane Cams or Crower Cams. Explain to the specialists what you have and they will give you the very best advice.

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Forget high rpm's the motor must be built from the ground up to change it's ability to rev any higher. The other gentleman hit the nail on the head. Torque is the name of the game today. You have a roller lifter hydraulic cam that's a huge plus. You may need a bit more lift lobe centers will remain much the same. The duration will be close to your present cam. Here's where your roller lifters will shine. Cam companies today build asymmetrical cam lobes. The intake opens faster remains open a tad longer but closes quicker. The cylinder loads with more air fuel mix. The exhaust valves opens faster and closes slower to release more gas. All this time your duration will not change much at all. The deal is quicker valve opening because of your roller lifters. You coulden't get away with this with a flat tapprt cam.

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You will have more torque at the bottom where you need power the most. Good luck shopping!
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