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Author Topic:   Cam Recommendations?
Pit Bull
Dirt Full Roller

Total posts: 42
posted January 21, 2001 10:12 PM
Ive got a 355 small block running ported 305 heads with 1.6 exhaust valves and 1.94 intake valves. Im running the steel shim head gaskets, and am required to run a 500cfm 2 barrel and cast iron exhaust manifolds. Id like to throw a different cam in it for this season, and was wondering what you guys thought would be a good one to run. Any help would greatly be appreciated.

dreamcatcher
Dirt Full Roller

Total posts: 37
posted January 23, 2001 07:47 PM UIN: 14464409
in 1997 i ran the same set up exept for the carb and i ran a comp cam pt# 280h, and it worked real good . i wonthe championship and 20 feature races including some big shows. this cam has lots of pull out of the hole. i hope this helps. good luck this season .
dreamcatcher

AuklandFan
Dirt Full Roller

Total posts: 74
posted January 23, 2001 09:51 PM
I assume the reason you are running the 305 heads is for compression and you are limited to a flat top piston. The biggest consideration I would consider here would be overlap. In a motor like this, cylinder pressure is crucial, so you don't want to blow any off. Don't make a mistake here, call Lunati and they will recommend something perfect for your application.

sixwillwin
Dirt Full Roller

Total posts: 35
posted January 23, 2001 10:23 PM
Just my opinion but........Lunati is horrible. Ever since Holley bought them its been downhill. I called them for a cam recommendation, ordered it, it did not run all that great, called them again and got a totally different recommendation and was told the first cam was for 4 barrells and bigger HP engines. I have heard similar stories time and time again. Lunati will never get a penny of mine again. Call anybody but Lunati. sixwillwin

AuklandFan
Dirt Full Roller

Total posts: 74
posted January 24, 2001 10:39 PM
OK, thanks six. I have not had any dealings with them since the Holley buyout. I tend to believe you though, since I have had trouble with Holley in the past. Good point!

Roadhzrd
Dirt Maniac

Total posts: 101
posted January 26, 2001 03:23 AM UIN: 28276986
I've heard the same thing many times about the new Lunati. They're big buisness now and seem to have lost the personal touch.

junkyard
Dirt Full Roller

Total posts: 32
posted January 28, 2001 11:08 PM
I have had very good luck with Clay Smith Cams.They grind each cam for each application.They recomended a different can for two 406's because one had 5.7 rods and the other 6.0 rods. Both engines were very fast.

Pit Bull
Dirt Full Roller

Total posts: 42
posted January 30, 2001 11:19 AM
I was thinking about the midwest motorsports #1 cam for my motor. Heres some specs:

Internal Duration @.050" 256
External Duration @.050" 264
Internal Lift 504
Exhaust Lift 504
Lobe Separator 105
Advance Internal Duration 287
Advance Exhaust Duration 295
Valve Lash .026-.026

Increased comp, advised, street stock with 2/barrell, 3/8-1/2 mile.

What do you guys think? Do you have any other ideas?

hotrodharry
Dirt Newbie

Total posts: 1
posted January 30, 2001 12:02 PM

That cam is way too much for a 2barrel and manifolds. What you need is a 236/244 degree cam at .050 lift,ground on a 108 centerline. Too much cam will make you a lot slower than too small a cam It needs to be ground on a 108 centerline to keep cylinder pressure up.

Pit Bull
Dirt Full Roller

Total posts: 42
posted January 30, 2001 10:34 PM
The hydraulic cam that I have in the motor is as follows:

Intake at .050 = 214 degrees duration
Exhaust at .050 = 224 degrees duration
Intake Lift = .450
Exhaust Lift = .470
Lobe Separation = 112 degrees

We felt that this cam was not adequate enough, and that we needed a different one for this coming season. Any other suggestions?

chomme
Dirt Full Roller

Total posts: 52
posted February 07, 2001 02:02 AM UIN: 1986763
Hi --

We ran a 350 w/the 305 heads in the past very much like yours. Turned it about 6300-6500rpm. The cam we ran was a Crane hydraulic cam. I forget the exacts, but it was a wider lobe sep (I believe 108/110) and about .510" lift and about 232 @ .050. I would think something like a comp cams 292 street hydraulic cam would work good on this...

quote:
Originally posted by Pit Bull:
The hydraulic cam that I have in the motor is as follows:

Intake at .050 = 214 degrees duration
Exhaust at .050 = 224 degrees duration
Intake Lift = .450
Exhaust Lift = .470
Lobe Separation = 112 degrees

We felt that this cam was not adequate enough, and that we needed a different one for this coming season. Any other suggestions?


Pit Bull
Dirt Full Roller

Total posts: 42
posted February 07, 2001 11:28 AM
So let me see if ive got this correct - a higher number in lobe separation helps build more cylinder pressure? Did this motor/cam combo work good for you? Was the cam I ran really that far off?

chomme
Dirt Full Roller

Total posts: 52
posted February 07, 2001 02:29 PM UIN: 1986763
The cam you had looks pretty good to me...lobe separation and all...although I would play around with the duration and go up a little. If you have access to Desktop Dyno (www.motionsoftware.com) run a couple cams in that program with your motor specs all entered, and it will give you a very good idea of the affects that the lobe separations can have on the motor.

quote:
Originally posted by Pit Bull:
So let me see if ive got this correct - a higher number in lobe separation helps build more cylinder pressure? Did this motor/cam combo work good for you? Was the cam I ran really that far off?

camcraftcams
Dirt Newbie

Total posts: 3
posted February 14, 2001 07:12 PM
What you need is about a 246 degree intake duration, 242 exhaust @.050 with a 109 or 110 lobe separation. This effectively controls reversion caused primarily by the restricted exhaust. This also lets you use a longer duration intake than normal.
Check our web site ( camcraftcams.com )and read the article Tuning your cam for maximum power. Restricted circle track cams are the backbone of our business. We can help you go faster.

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