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this is what they say about the ford 303 cam(aka, alphabet cams) The Z303 camshaft. This cam is a lot like the X303, but even more extreme. This came has a ridiculous 552 intake and exhaust lift. You will definitely need to notch your stock pistons or buy aftermarket pistons that can even clear that much lift. Aftermarket heads are strongly recommended with this cam, otherwise, you’re just wasting your money. If you need the best drag racing cam possible, then the Z303 cam is for you.
it has less lift than your cam your looking at .549/.565, duration isnt helping, if this is going in a truck you will sell it when your done, see below what options you have, quite a few posted by Conanski
A question about the 3 cams listed in orange. The notes say they've been made to work with SD computers. Will they work with MAF computer? They all have <220 duration@ .050" lift and 114 LSA, so will they pass CA smog check?
A question about the 3 cams listed in orange. The notes say they've been made to work with SD computers. Will they work with MAF computer? They all have <220 duration@ .050" lift and 114 LSA, so will they pass CA smog check?
The Z303 is not that radical. I'm running it in my 331 with Canfield's equivalent of AFR165's with 1.7 rockers and the powerband is pretty broad from 1500 to 6500 rpms. With the 1.7's the lift is .587, the duration @ .050 is only 228*. The B cam is the sleeper. I ran it with the same heads on a 302 with a Vic Jr and 1.7s. it would pull to 7500 in that combo. Got wicked idle too. The only one that might pass CARB is the E cam. Its got a CARB number the rest do not
That surprised me, since it has 220 duration at .05, and 110 LSA. I thought that combination would produce poor emissions. Is it the 0 overlap at .05 that keeps it clean? I note that all the other -303 cams have 10 degrees of overlap. Still trying to understand cams.
That surprised me, since it has 220 duration at .05, and 110 LSA. I thought that combination would produce poor emissions. Is it the 0 overlap at .05 that keeps it clean? I note that all the other -303 cams have 10 degrees of overlap. Still trying to understand cams.
Putting it in a 351 displacement engine will tame the specs somewhat. So it'll have a better chance of passing smog than in a 302. This is true for all engines. A cam that's a big rumpity rump in a small engine, sounds and behaves completely different in a larger displacement engine
(I know it says "Hot Rod, but I'm sure it was originally a Car Craft article.)
I'll be using an EFI setup with either a ported Explorer or GT40 tubular intake, so I might make the same power with the right cam in a bigger displacement.
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