ive got a 89 350 with a 488/292dur cam with a 86 vette intake on it.Electronics is a 7730 ecm. My question is will this thing even be possible to tune? or is the duration to long?
Thanks guys.

 

seems tunable to me.

i'm guessing it's a flat tappet cam around 225* at 0.050? what kind of overlap does it have, what is the LSA?

assuming something generic typical (like 225* @ 0.050, 112* LSA), it will require some tuning over stock, but seems well within realm of possibilities considering what others have tuned for on here.

also, IMO, that is enough cam that TPI is not the ideal choice for intake.

 

When posting cam specs you should always post all the #'s.
And for advertised duration you have to list where it was measusred from. ie .004, .005 .006 etc. All of Comps hyd's are from .006 so they are an exception.
Moving the start point for measuring will change the adv. duration about 3.5 degrees for .001 change. So a cam spec'ed at .004 will list as 7 degrees bigger than one listed at .006. This is all advertising double speak at work. Check out a bunch of Crane cam cards to see what I mean.
Most people will list the .050 #'s since they are common.
And this is fine for the newer cams. The 70'-80' era lobes may or may not have fast ramps and it will show in the adv #'s.

A fast cam w/ 288/292 will be in the mid 230 @ .050.
A slow cam will be in the mid 220 range. This is assume the same starting point. As an example my old hyd cam had an adv of 292/302 from .003. At .006 to compare to CC, it was 280/290. It had 236/244 @ .050.

And yes, anything over about 224 @ .050 would be better of with a different intake. And there are people with cams in the 240+ range on here that got them tuned.
But they knew what they were doing or know someone that does.