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Old 04-21-2006, 07:58 PM
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Question about what cam to use

I have a question.I know there is some serious engine builders on this site who have already done what I'm doing.Any way the engine is a 400 small block 4.185 bore.It has 10.5 compression,it has been decked,and the springs on the springs have a 680 max lift,and I was talking to who made the head,and they said the smallest I could go with these solid roller springs would be like a 516" lift.There made by jegs Hi-performance,and they are the aluminum 64cc with 197cc runners,The car will be a street strip car,and has a 3500 stall with 4:10 gears.The pistons have a d cup,and are made by Keith Black KB130,I am also running a 6" eagle I beam rod.I am wanting the rpm range to be about 3000-6500 or somewhere in there.I want to make the most power,and I was also told I could run a flat tappet cam,would that work it would be alot cheaper,but would it hurt my performance?Just any help on the engine and a good cam selection would be greatly appreciated,if someone has built a similar engine who has put alot of mustangs in there rear view give a recommendation on a cam that should make my 70 Camaro do the same. I want to use as much lift as I can without hurting my power level
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Old 04-22-2006, 12:05 AM
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You may not know this, but every cam grinder out there has a tech department with analysts who will spec a cam for you free of charge. You may get some recommendations on this forum as well. Consider all answers and choose the cam which sounds to you like it will do the best job for you.

You will get more performance from a roller cam than with a flat tappet cam of the same 0.050" lift specs because the roller can get the valve open quicker. The other advantage is that, barring something catastrophic, the lobes won't go away on a roller like they can on a flat tappet cam.

You are just about at the limit of hydraulic cams at 6,500 because of lifter pump-up. You may want to look at a solid roller and a solid flat tappet type cam before you make a choice.
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Old 04-22-2006, 01:39 PM
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yea comp cams makes a solid flat tappet with a 555" lift on intake and exhaust,with a 3000-6500.I'm thinking of going with this one
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