I'm curious what people believe the specs are for the original A12 cam or the comparable 4-bbl version that supposedly was the same specs (other than the lobe taper). All I know for sure is one version of what looks like a repro cam is 214/225 @ .050", .449"/.464", 115 LSA. Has anyone measured the MP repro cam and can compare it with those #s?

Also, if you contacted the tech people for the Pure Stock Muscle Car Drags and asked them what the original cam specs are for the purpose of Certification, what would they say?

I don't know about the lift, but the advertised duration for an A12 was 276 292 with 54 degrees overlap. I have an original one if you want to get together and check it?

I believe forged pistons and more cam were on the drawing board for the A12 cars but I was under the impression neither made production. JD I would be courious as to the spec's of your cam, please let us know.

I would also like to know about the spec on the orig. A12 cam. I never saw one, I do have an original '70 six pack cam. I always thought the A12's speced out the same as the 4V's with the exception being the use of the low taper design lobes/lifters.

Mike

sounds like JD needs to get his OE cam over to Brad so he can put it in a block and measure it up.

RoadRunnerJD and I will be making arrangements to measure his OEM A12 cam at some point to have a legit point of reference from which to compare other cam options. I can't say how soon we'll get this done, but it will happen.

BTW, the cam I had ground for my A12 RR, what I refer to as the "Mr. Snack Pack" grind" is...
Adv duration - 272/280
.050" duration - 223/232
Lift (1.5) - .503"/.513"
LSA - 115

The intended use is a for 9.5:1 CR, 906 heads w/ stock-size valves and some bowl porting, OEM exhaust manifolds, a high-flow replacement 2.5" exhaust system, 4.10 gears, 4-speed, and a custom-curved distributor from FBO. If I was running an automatic instead of a 4-speed, I'd either drop the duration down a size on both intake & exhaust, or have the same lobes ground on a tighter LSA... maybe 112-113.

Brad I used a Hughes 223-230 504I 515E with good results. It seemed to be a good exhaust manifold cam as it pushed a 3860 lbs Bee 110+ in the quarter with a cast iron intake and AVS carb. With 451 cubic inches you could hear the cam in the exhaust just slightly.

I know this is an older thread...But did anyone get a definitive answer as to what where the actual specs of the A-12 cam? It sounded like someone had an orig. A-12 cam they were going to blueprint but never posted their findings.

From the links above you can see some magazines of the time printed the specs as 276/292 duration - 54 overlap, and some stated it was the same 268/284 duration - 46 overlap cam found in the 440/383 Hi-Po motors.

I posted the measurements from John D's A12 cam years ago on another thread covering some similar info.

IIRC...
Seat duration at .004": 292/310
.050" duration: 214/226
Lift: .449"/460"
LSA: 115 +3 (112 ICL)

Holy crap; another TFTD (Thread From The Dead)!

....It's even got B body Bob in it!


Dave

Does anyone know approximtely how much manifold vacumn you will have with this cam?

Bob told me 18 - 19"

Dave

Thanks for the info BradH. Interesting seat-to-seat numbers for the duration.

Blast from the past...

Are these cams still available?