89Formula350WS6

Anyone have one laying around so they can check the numbers for me? I think I just bought one on eBay, but how do I know for sure what cam it is?

IROCZZ3

Don't know if this helps or not- but since the ZZ3/ZZ4 cam are the same, here's the numbers on my old ZZ3 cam right before I sold it.

89Formula350WS6

Thank you for the quick reply. I finally found a similar question through a search, but there wasn't a definate answer to it either. I went ahead & replied to it with my cam's numbers also to try and find out.
My cam has: 586 FM43 & 062 99L on the end. No paint stripe on mine either. I know you can measure the lobe lift somewhat, but I've always heard that the lobe ramps on rollers & HP cams "wrap" around the cam enough to make getting a definate base circle measurement to subtract from the total lift impossible. (Did I explain that correctly?) An old post said that you could measure & get within .030" lift, but that could be almost any GM roller. .474" +/- .030" = .444" to .504"!!! That could be anything from a stock LT1 cam to a LT4 HOTcam and anything in between. I have no reason to suspect the seller, I just refuse to go through a cam install without verifying that it is the cam I think it is first.

Dyno Don

iTrader: (7)

A 586 is a LT4 Hot cam

89Formula350WS6

Thanks DYNO DON. I checked that after reading your reply at GM Performance Parts Online. I always thought that the part numbers in the catalog wouldn't match up with what is on the parts, but I realize that I am thinking about how the part numbers & casting numbers don't match.

- LT4 HOT cam kit:

This kit includes the following items: one camshaft P/N 24502586, 16 roller rocker arms kit P/N 12370839, 16 valve springs P/N 12551483, 16 valve caps P/N 10212808, 16 valve keys P/N 24503856, 16 valve spring shims P/N 10212809.

Looks like I have a HOTcam that I figure is too big for me since I haven't gotten into the PROM burning yet. Guess I'll be selling it & looking for another zz4 cam. Anyone know how a HOTcam would run in a 89 L98 MAF car with only fuel pressure adjustments for tuning?
I bet it would be easier to get it to work in a 383 due to the longer stroke working with the longer duration. I know I always have to cam my 454's bigger than the 427's by about 10 degrees @ .050"

Mark 89Formula

I don't know about some of the larger rollers but you can easily determine the base circle for the ZZ3/4 cam. I've measured the lobes on my ZZ3 cam using a cheap set of calipers and came within .001" of GM's advertised lobe lift on every single lobe.