Thread: Cam selection for my fiero

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Well i am running a 88 fiero with a 355 sbc and i am currently running a 420/420 lift 224 with 112 lobe separation cam its what came with the motor. Since i changed the heads on my motor just in the past few weeks to 64ccRHS heads that flow a billion times more then my boat anchor 882`s i kind of want to beef the car up a little. Im running a standard transmission so stall is out. car weighs about 2600 lbs. Let me hear what you think! thaks
Prox.

Originally Posted by Proxemus

Well i am running a 88 fiero with a 355 sbc and i am currently running a 420/420 lift 224 with 112 lobe separation cam its what came with the motor. Since i changed the heads on my motor just in the past few weeks to 64ccRHS heads that flow a billion times more then my boat anchor 882`s i kind of want to beef the car up a little. Im running a standard transmission so stall is out. car weighs about 2600 lbs. Let me hear what you think! thaks
Prox.

As far as duration, this is just a guess, but it looks to me like you're cammed out until you put some more static compression ratio into the motor. Could use more lift without any penalty, but more duration will make the motor weaker, depending on SCR. I always find myself saying this.....You can't intelligently choose a cam for a motor until you know the static compression ratio. What I'm basing my answer on is that the cam you're using is designed to be used with 9.5-11.0 SCR. If the motor is, for instance, 9.5 and you install a cam with, for instance 240 degrees duration, the intake closing point will be extended farther, allowing the piston to come up in the bore much farther before the intake valve closes, so the motor will be soggier than it is now unless you raise the SCR to match the new cam.

Bottom line: If you don't know what the SCR is, leave the motor alone.

The trans ratios are so low in the available Fiero trans that you don't need bottom end torque..... you just need to learn to shift fast enough . I'm using a HE cam in my 377 Fiero with, as I recall, around 490 and 510 lift and 230 duration. sounds like a lot for 9.7:1 but it works well given the total package. I also use an Edelbrock performer RPM cam in mine at one point. it was rather peeky, but worked pretty well also.

Russ

right now my scr is 9.1:1 so that will help you, once i get my heads the 64cc ones i will prob be high 9's.