cam question

chucks1967 · Mar 27, 2008

when I bought my 67' the fella' I bought it from said it had a cam..... now natrually it has a cam, but what kind of cam... he didnt know. is there a way to determin the cam specs of an unknown cam?

Rusty67 · Mar 27, 2008

Yes there is and I'm sure there is an easier way to do it. They way that I know of is to use a gauge on a magnetic base to measure the cam movement and rotate the engine assembly. I think this can be done by yanking the valve cover and checking the movement of the intake and exhaust rocker arms. Not sure if I'm 100% correct on that. Confermation should come soon....

SadbutTrue · Mar 27, 2008

Rusty67 said:
Yes there is and I'm sure there is an easier way to do it. They way that I know of is to use a gauge on a magnetic base to measure the cam movement and rotate the engine assembly. I think this can be done by yanking the valve cover and checking the movement of the intake and exhaust rocker arms. Not sure if I'm 100% correct on that. Confermation should come soon....

Yeah, i would think that if you put a breaker bar on the rotating assembly and turned it one full turn and kept your eye on an intake valve (or maybe it'd be easier just looking at the pushrod), you could measure how many degrees out of 360 its open (duration) and you could measure how high the pushrod goes (times your rocker ratio = lift). Repeat for exhaust and you'd have a rough idea of your cam specs. Not sure how practical that'd be, it might just be easier to guesstimate based on what rpms your engine wakes up and when it runs outta breath.

chucks1967 · Mar 27, 2008

I know this is not a really good way of telling if a cam over stock is sittin in my car, but it has a nice cam lope about it at idle. the car really comes alive of the line, arround 1000 RPM and never "runs out of breath" Ive had it up to 5200 RPM and decided to let off because of the age of the motor. even at that rpm it was still pullin' pretty hard. but it feals the strongest from 2500 to 4800.

65kcode · Mar 27, 2008

chucks1967 said:
I know this is not a really good way of telling if a cam over stock is sittin in my car, but it has a nice cam lope about it at idle. the car really comes alive of the line, arround 1000 RPM and never "runs out of breath" Ive had it up to 5200 RPM and decided to let off because of the age of the motor. even at that rpm it was still pullin' pretty hard. but it feals the strongest from 2500 to 4800.

Unless it's a hipo 289, it has a bigger cam than stock from what you are saying.

Kevin

chucks1967 · Mar 27, 2008

To be totally honest I dont realy know that the engine is orrigonal. I took the intake off last night and in the vally pan it was stamped with 302.... I have posted that as a question in another post. I know the car was not a HIPO car it is a "c" code vin. so it must be a taller cam then. now my question is will it make a big difference going to a performer 4bbl intake verses the "stock" 2bbl, cause thats what Im in the process of doing right now. what kind of gain should I be looking at?

Rusty67 · Mar 27, 2008

Don't get the regular performer, get an RPM air gap or at least the RPM. Having a 2bbl carb on there before, changing to a 4bbl should give you some extra performance. What carb are you looking to get ?

chucks1967 · Mar 27, 2008

I already have the performer.... and im using a 450 cfm holley m/s

SadbutTrue · Mar 27, 2008

Unless its already on the car, I'd recommend selling it on ebay and getting an RPM, RPM Air Gap, or Weiand Stealth. You shouldn't lose more than $20 or $30, and I gaurantee you the Performer would hold your cam back.

For small block fords, the Performer is essentially an aluminum version of the stock 4 barrel intake (for Chevy's and some others, the Performer is a legitimate intake, but they half-assed the Ford version).

D.Hearne · Mar 27, 2008

Other good intake choices are Ford Racing's A321, Edelbrock's older F4B, The Shelby "Cobra" high rise and Ford's older C9OX. These are all basically clones of each other, and are all high rise dual planes. The difference between these and the ones listed by "SadbutTrue" is the runner configuration, the ones I listed are an "unequal runner length" design where the others have equal length runners. That said, there's not 10 HP difference between all of them. They're all good. And all work from idle to 6500 rpms. You'd want a bigger carb likely though with them. The 450 will work, but may need a larger accellerator pump with these.

htwheelz67 · Mar 27, 2008

use an rpm, theres really no difference in power between an rpm and an rpm air gap once the car is warmed up and throw a 650 vac sec speed demon on it.

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