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Old 01-11-2011, 03:34 PM
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Which Cam do I use?

Ok I'm sure it's on here somewhere but I can't find it. I am building a stock flat top piston vortec engine. I will be purchasing the Scroggin-Dickey kit with the basic springs and performer intake. The max lift for those heads is .450. I want to go the max but not over due to cost and also want to stay basic. Any ideas? All the things I am reading they want you to go for the higher lift and stronger springs but I don't want to do that.

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Old 01-11-2011, 04:09 PM
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List the particulars on what it is you currently have, more detail on what engine/heads/cam you have right now as well as the intended usage of the vehicle its going into etc, I assume that its a roller block? can't be sure. Most after market roller cams are beyond .450 lift

Last edited by Custom10; 01-11-2011 at 04:11 PM. Reason: spelling
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Old 01-11-2011, 04:31 PM
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I agree. List all the details so we can play along. If it's a flat tappet motor there are low lift .450 rule camshafts for oval / dirt track racing, but the LSA tends to be tight, 106 - 108 range, which might not suit your needs / vehicle.
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Old 01-11-2011, 05:10 PM
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I am getting the motor this weekend so I will check it out. The motor is out of a late 80's truck and was just gone over about 10,00 miles ago. He stuck some goodies in it but stayed with th boat anchor heads. He may have a bigger cam in it than I would prefer or if it is suitable I could go with the scoggin upgrade kit of the Z28 valve springs and LT4 retainers. I plan on putting it in my 73 Corvette to replace my L48 dog. Plan on putting 3:73 gears in it over th 3:08 ratio.
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Old 01-11-2011, 06:16 PM
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Buy these if you want more lift options.

Also the stock Vortecs properly assembled are good to .480 ish. .450 is if the Valve seals and guides aren't installed properly from what I have read.
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Old 01-11-2011, 06:17 PM
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http://cgi.ebay.com/ebaymotors/VORTE...Q5fAccessories


Didn't paste it last time.
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Old 01-12-2011, 05:58 AM
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Use the GM BeeHive springs part # 12499224 and Sealed Power seals #ST 2015, these seals are a little thinner on top to give you more retainer to guide clearance. I used the LT4 Hot cam, which is about .492 lift and I didn't have any problems.
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Old 01-12-2011, 08:44 AM
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IMO, you would be better off buying some head ready to go with upgraded springs for more lift. I'm sure Scoggin Dickey has a package with that option. That way you wont be limited on cam selection.

Although, I personally have a low lift .450 cam (Isky # 201278) in my car and I'm very happy with it. It has that cool race / rough idle and makes tons of torque down low. It's quite scary to be honest.

Search for key words "201278" and "vortec" heads. F-Bird'88 has laid out a 350 build using that specific cam, vortec heads, rpm style intake and 750 carb. All else pretty much stock. Makes 410 hp.
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Old 01-12-2011, 03:51 PM
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Steathy1991 said he was trying to keep the cost down and stay basic. A set of heads would crunch his budget, a set of Bee-hive springs would cost about $50 plus seals. A spring change is easy and would be more prudent.
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Old 01-12-2011, 04:04 PM
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Quote:
Originally Posted by Vix76
Steathy1991 said he was trying to keep the cost down and stay basic. A set of heads would crunch his budget, a set of Bee-hive springs would cost about $50 plus seals. A spring change is easy and would be more prudent.
In that case, get either Isky springs 205-D or Lunati 73943, remove the inner dampers and swap them out. Stock self aligning stamped GM lifters will do the trick.

If the block is a non roller, get isky cam 201278 and install it 4 advanced. Use a vortec RPM style intake like the stealth manifold, and use a 750 carb.

F-Bird'88 dynoed this build and it makes 410 hp. Look it up.
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Old 01-12-2011, 04:06 PM
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Stealthy don't trade DOWN to a hyd. flat tappet cam. Its a roller cam motor, so keep the roller cam performance. Change to the Beehive springs. You can pick up a great GM LT4 (.495 lift) hyd. roller cam at Wilhoitescams.com for less than $150. Everything else you need is already in the roller cam Vortec block. This would be a simple upgrade.
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Old 01-13-2011, 11:01 AM
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Quote:
Originally Posted by Vix76
Stealthy don't trade DOWN to a hyd. flat tappet cam. Its a roller cam motor, so keep the roller cam performance. Change to the Beehive springs. You can pick up a great GM LT4 (.495 lift) hyd. roller cam at Wilhoitescams.com for less than $150. Everything else you need is already in the roller cam Vortec block. This would be a simple upgrade.
I agree, keep it roller, but you'll need to just get upgraded heads to handle the extra lift cause finding a roller cam or someone who will grind you a cam with a .450 lift is slim to none.
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Old 01-13-2011, 08:36 PM
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I just discovered the dyno program within the CamQuest program in the cam selection thing on Comp Cams website.

First they ask you a bunch of detailed questions on your motor, then offer a selection of cams that will work.

The neat part is that for each cam, you can open the dyno program that will give you calculated hp and torque graphs and info. That's helpful in seeing what different cam specs will do to your power and torque curves and peaks.

I just went thru that for my 81 Vette with the pathetic L81 motor. I'm going to go probly either the Summit Racing vortec style heads or similar RHS heads, being on a strict budget. They don't have lift issues and have even more efficient comb chambers than stock Vortecs, as well as flowing more. I had a lot of figuring to do to see what chamber size I'd need cuz I can't afford to tear into the shortblock to change pistons.

It's just for a cruiser motor that I need good gas milege out of for longer trips, but I still want decent throttle response. I'm going with an overdrive to get rpms down under 2k for the freeway so need a cam with good low rpm torque. It's amazing how much difference there is in fairly similar cams with regards to torque and hp curves. I would have likely picked the wrong cam without going thru a bunch of them on that program.
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Old 01-15-2011, 10:54 PM
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Here's some info I've discovered after the above post.

Looking at the exhaust to intake flow ratio on the Summit heads, they're
at a rather low % (under 60%) for the exhaust which many folks say isn't good,
at least in a performance engine with any higher rpm.

The RHS Pro Torque and Dart Vortec style heads are very good heads
but the assembled cost for a pair runs a little over $1000 most places.

Then I discovered info on EQ heads - they're cast in Australia and
assembled by various outfits in the US. They have Vortec style ports
but are supposedly improved to resist valve seat cracking and improve
the exhaust flow. Good ones with SS valves, bronze guides, pc seals,
etc can be had for a couple hundred less than the RHS ones at
Shaver Specialties. Less expensive ones with parts more like the oem
Vortec heads (cast iron valve guides, umbrella seals, non-SS valves)
can be had for about $320 ea here
http://www.rogersperformance.com/EQ.htm
They offer a variety of port and valve sizes.
The EQ heads have a better 62% exhaust - intake flow ratio.
http://www.rogersperformance.com/EQFlow.htm
They're apparently popular in IMCA claimer class racing so must be
durable and good performing for the cost.

Here's a Popular Hot Rodding article on a build using the ones from Shaver.
http://www.popularhotrodding.com/fea...ine/index.html

The ones from Rogers are similarly prices to new oem standard Vortecs
and according to what I've read have better exhaust flow and have the
exhaust valve seat cracking solved. Also they can use guideplates for
non-self aligning roller rockers, and the plates come with the heads.

Unless I find something better, those are the ones I'm most interested in
right now on a cost per performance basis.
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