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Old 06-08-2012, 01:10 PM
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Heads are tested need cam help

195cc intake runner, 64cc combustion chamber, aluminum, 2.02, and 1.60 valves
Superflow sf 600 flow com
air speed: 380-100FT, 375-410SC

Intake;
(.1)66
(.2)141
(.3)200
(.4)242
(.5)270
(.6)265
(.7)268

Exhaust;
(.1)55
(.2)107
(.3)139
(.4)167
(.5)192
(.6)209

2500lb car 245/50r16 street tires rated at 320aa by firestone (I don't really need tq the car is very light and I am limited on tire)
1987 700r4 trans
3.545 rear gear ratio
10.25:1 compression
chev 327 40 over now may end up 60 over soon
1.6:1 rocker ratio

Looking for a solid flat tappet.

I'm looking to have a very WIDE rpm range, as much as possible. Comp claims the old duntov 30-30 is between 2300-6900. I'm talking that kind of wide. The issue with the cam is that the one they sell is for a 350 and that would bump my rpm past what I want it to be.

I'm looking for a 6700-7000 peak rpm, with it coming in as low as I can get it at.

One thing I have heard and read a lot of debate about is the fact that the 327 doesn't sit at top dead center for very long so a wide lsa (about a 112-114) would be beneficial. Also it would kill the tq down low. The other end of this opinion is that one could do a 110 lsa and advance it quite a bit. I don't honestly know what would be best. Some help/thoughts/advice would be great.

The car is intended for the road course at BIR in MN. Both the outer longer track and shorter center track.
http://www.brainerdraceway.com/

It looks like 1st gear is just to get going and 2nd gear should be about 33 mph at 2500 rpm and will be 80mph at 6000rpm. 3rd will go from 55mph @ 2500rpm to 130 @ 6000rpm or 140 @ 6500 rpm so 3rd should be a great gear for most of the high speed sections. 2nd should be enough for any tight stuff. Overdrive is 200mph + so that's good for a bit of extra pull down a straight if I'm able to go faster than 140mph before braking for the turn.

Looking at the Brainerd track it looks like a lot of high speed corners and long straightaways without too many tight corners. I have wide gearing so this should suit the track well but it means I need a wide powerband as well.

Help and advise or a point in the right direction would be great.

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Last edited by blight; 06-08-2012 at 01:33 PM.
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Old 06-08-2012, 02:18 PM
How fast is fast enough?
 
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Wide power bands lead to lost races... btw it doesn't matter if a cam is sold for a 350, 283, 400, etc, its all sbc. And the 30-30 cam is a POS by todays standards.
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Old 06-08-2012, 02:50 PM
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This is what I am looking for. What would get me there? The wide powerband was recommended by whitehead performance in canada, they are well known for racing at the nurburgring. I don't take his advise lightly.

The 30-30 does suck, I am just pointing out that a wide powerband in a solid flat tappet can be done. Also when I was saying the difference between a 350 and a 327. The small crank throw will up the rpm a bit. Instead of being at 2300 it would be like 2500-2600, and instead of being 6900 it would be like 7200-7300. That is too peaky for me. 2300 to 6900 would be perfect if it was rated for the 327. When comp rates those numbers they are all done with a 350 base. Not a 3.25 but a 3.48 crank.

Last edited by blight; 06-08-2012 at 02:59 PM.
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Old 06-08-2012, 07:20 PM
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air speed: 380-400FT, 375-410SC twas a typo
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Old 06-08-2012, 07:42 PM
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The old duntov 30-30 does not have a wide power band.
The power band of that cam does not start till 4000+rpm.
All the GM cars that used that cam had a manual transmission.

Does not work with a auto trans with a stock converter.
needs a 3500++ converter and 4.10++ gears.

Better cam for road racing. w auto trans
Lunati 401A3LUN
Crane F-280-2
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Old 06-08-2012, 07:48 PM
How fast is fast enough?
 
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Quote:
Originally Posted by blight
This is what I am looking for. What would get me there? The wide powerband was recommended by whitehead performance in canada, they are well known for racing at the nurburgring. I don't take his advise lightly.

The 30-30 does suck, I am just pointing out that a wide powerband in a solid flat tappet can be done. Also when I was saying the difference between a 350 and a 327. The small crank throw will up the rpm a bit. Instead of being at 2300 it would be like 2500-2600, and instead of being 6900 it would be like 7200-7300. That is too peaky for me. 2300 to 6900 would be perfect if it was rated for the 327. When comp rates those numbers they are all done with a 350 base. Not a 3.25 but a 3.48 crank.
Have you driven anything with a cam like the 30-30? I assure you its not even close to a broad power band. The "rating" means absolutely nothing. For your rpm you'll be looking at a tight lash solid cam around 240/250 on a 112 or so. Btw it will be a little soggy below 3,000 rpm. But 3,000 rpm should be a little below any rpm you see racing.

FWIW I have a 240 hydraulic cam in an engine much smaller than yours and it drives just fine on the street. But it comes alive after about 4,000 rpm.
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Old 06-08-2012, 11:40 PM
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Quote:
Originally Posted by ap72
Have you driven anything with a cam like the 30-30? I assure you its not even close to a broad power band. The "rating" means absolutely nothing. For your rpm you'll be looking at a tight lash solid cam around 240/250 on a 112 or so. Btw it will be a little soggy below 3,000 rpm. But 3,000 rpm should be a little below any rpm you see racing.

FWIW I have a 240 hydraulic cam in an engine much smaller than yours and it drives just fine on the street. But it comes alive after about 4,000 rpm.
That is what I am starting to find out. My builder sent the head spec etc to some cam company he knows I am interested to see what they come up with. I have called my own.
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Old 06-08-2012, 11:44 PM
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Quote:
Originally Posted by F-BIRD'88
The old duntov 30-30 does not have a wide power band.
The power band of that cam does not start till 4000+rpm.
All the GM cars that used that cam had a manual transmission.

Does not work with a auto trans with a stock converter.
needs a 3500++ converter and 4.10++ gears.

Better cam for road racing. w auto trans
Lunati 401A3LUN
Crane F-280-2
That crane cam is for a ford
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Old 06-10-2012, 04:33 PM
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Quote:
Originally Posted by blight
That crane cam is for a ford
The Crane part number for the F-280-2 cam grind, for a Small block chev
is 114681.

Go to the Crane cams site and have a look.

Call their tech line if you need help with the
valvetrain components.
www.cranecams.com
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Old 06-20-2012, 02:47 PM
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cam

when you figure it out,let me know what specs you chose in flat tappet,curious.
My application is a little bit bigger engine and slightly bigger heads.All else similar.I used a solid roller with 256/264 duration at .050,,,108 intake centre line and 108 lda.its .420 lobe lift with 1.5 intake and 1.6 exhaust shaft rockers.My peak horse power is at 6470 rpm and peak torque at 4400-4700 rpm.its also a tight lash cam. .020 and .022 lash
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