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Old 10-17-2012, 07:26 PM
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Vortec Heads with 292h Comp Cam

Has Any Body Ran A Comp Cam 292H (501/501)lift, with Vortec Heads 64cc, If so how did it perform on the Street, and did you have any problems running the set up?

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Old 10-17-2012, 07:47 PM
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Not a simple install. Machine work and spring setups required.
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Old 10-17-2012, 07:47 PM
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you have to machine the spring pocket as stock vortecs don't do lift over .450
I'm not sure but I think the pressed in studs need to go to..
I have a 292 in my 355 but it has brodix trackI heads
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Old 10-17-2012, 08:01 PM
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How does it run with those Brodix heads??
i juss ordered the springs, i talked to comp cam they said to use the behive springs to avoid machining the heads..
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Old 10-17-2012, 08:19 PM
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Its a really big hydraulic cam, for the RPM the duration lends itself towards you'd be better off going with a solid flat tappet.

You may want to consider a solid cam, since its a toy you can get away with checking lash only once a year or so and they can be made to be more durable.
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Old 10-17-2012, 08:21 PM
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Quote:
Originally Posted by E.Furgal View Post
you have to machine the spring pocket as stock vortecs don't do lift over .450
I'm not sure but I think the pressed in studs need to go to..
I have a 292 in my 355 but it has brodix trackI heads
E.Furgal is correct about the pressed in studs. Rule of thumb is 6k rpm you need larger screw in studs. Its cheap to get done i would not risk my engine on a weak stud. I swap them out at 5500. Your cam is going to be making power at 6500 with that cam vortec heads do flow good so you be able rev the crap out of it. But it will see 7000 rpm at times. Miss shifts something. Pressed studs will lift out or snap off.

It will be worth it. That cam is going to make that engine sing.

Hope this helps.
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Old 10-17-2012, 08:38 PM
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ok i appricate the help i am about to look up the screw in studs. Is there a spacific company that i should go With that makes them??
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Old 10-17-2012, 08:50 PM
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Originally Posted by stackitup_91 View Post
ok i appricate the help i am about to look up the screw in studs. Is there a spacific company that i should go With that makes them??
ARP.

Do you already have the cam? If not it's not really a good match for the Vortec heads. They start choking a little before 6,000 RPM. Stick with something in the 220-230 range or even smaller for those heads and you'll be better off.
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Old 10-17-2012, 08:55 PM
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yes i already bought the cam but i still have another month so i can still return it,, what would be the best cam to go with, the the vortec heads
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Old 10-17-2012, 09:14 PM
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yes i already bought the cam but i still have another month so i can still return it,, what would be the best cam to go with, the the vortec heads
The XE or VooDoo 268 is a really good off the shelf cam for stock Vortec heads in a flat top piston 350 with an RPM intake, 700+/-cfm vacuum secondary carb, and 1 5/8" headers. Runs good with a 2500 stall.

That combo has been done a LOT because it works very well.
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Old 10-17-2012, 09:29 PM
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Originally Posted by ap72 View Post
The XE or VooDoo 268 is a really good off the shelf cam for stock Vortec heads in a flat top piston 350 with an RPM intake, 700+/-cfm vacuum secondary carb, and 1 5/8" headers. Runs good with a 2500 stall.

That combo has been done a LOT because it works very well.
x2...

my brodix headed 355 goes nicely, the heads are ported and it really needs a roller solid in it..
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Old 10-18-2012, 02:22 AM
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Vortec heads with 292h Comp Cam

I am posting these dyno sheets from Comp Cams for you to compare. XE262H-10, Camshaft Part#12-238-2 Dyno Sheet XE268H-10, Camshaft Part#12-242-2 Dyno Sheet I was surprised at the results. Bigger is not always better.
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Old 10-18-2012, 05:14 AM
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Originally Posted by cdminter59 View Post
I am posting these dyno sheets from Comp Cams for you to compare. XE262H-10, Camshaft Part#12-238-2 Dyno Sheet XE268H-10, Camshaft Part#12-242-2 Dyno Sheet I was surprised at the results. Bigger is not always better.
surpriced.. why.. Jeff Smith and the late great John lingerfeller(sp?)
have been saying this since the early 80's
more power under the curve....
it's not all that hard to make peak hp.. it's the power under that..
unless you are Warren Johnson shifting a lenco.. then peaky is good
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Old 10-18-2012, 05:56 AM
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Quote:
Originally Posted by cdminter59 View Post
I am posting these dyno sheets from Comp Cams for you to compare. XE262H-10, Camshaft Part#12-238-2 Dyno Sheet XE268H-10, Camshaft Part#12-242-2 Dyno Sheet I was surprised at the results. Bigger is not always better.
I agree that dual pattern cam shafts can act funny and dyno results dont always show the true picture. They are designed to widen the power band.

In this case the lower hp is from the low compression ratio. Its only 9.25 for both engines. The larger cam needs more compressions. Also not that the larger cam is only a few degrees more duration. this is because these two cams were ground with a different purpose in mind.

But he has already purchased a larger single pattern cam shaft. That is a proven performer as long as the cr or dcr is high enough to support the larger stick. this cam with the good heads and right cr should hit the 400 hp mark. Low cr will produce much lower results.
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Old 10-18-2012, 07:44 AM
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Quote:
Originally Posted by hcompton View Post
I agree that dual pattern cam shafts can act funny and dyno results dont always show the true picture. They are designed to widen the power band.

In this case the lower hp is from the low compression ratio. Its only 9.25 for both engines. The larger cam needs more compressions. Also not that the larger cam is only a few degrees more duration. this is because these two cams were ground with a different purpose in mind.

But he has already purchased a larger single pattern cam shaft. That is a proven performer as long as the cr or dcr is high enough to support the larger stick. this cam with the good heads and right cr should hit the 400 hp mark. Low cr will produce much lower results.
The larger single patter camshaft will make less power, less torque, and burn through more fuel. The heads simply can't support it. FWIW, Vortec heads can hit 400hp with the 262 cam mentioned. The 268 cam will only make about 5hp more than the 262.

Running a bigger cam than the heads can support will not make more power, but people don't want to hear that.
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