4 Pattern cam
Le Mans Master
Joined: Mar 2001
Posts: 5,738
Likes: 644
From: Lincoln, CA
Makes perfect sense but on a dual plane the outer and inner get mixed up.
Look at this LS6 intake. On the left side the shorter runners on inside.
On the right side they move to the outside and are longer. I guess they could make dual and single plan setups.
Look at this LS6 intake. On the left side the shorter runners on inside.
On the right side they move to the outside and are longer. I guess they could make dual and single plan setups.
Drifting
Joined: Jul 2013
Posts: 1,299
Likes: 93
From: Tri-Cities TN
If you are going to flow the heads with the intake manifold and carb the yes this is the way to do it. My stock headed BBC stuff in both Super Stock and Truck pulling has a 3 lobe camshaft on it......intake lobe for the good and bad intake ports of a BBC then 1 for the exhaust port.
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,791
Likes: 428
From: Aarhus, Denmark
But in theory it sounds good, I think.
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,791
Likes: 428
From: Aarhus, Denmark
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Drifting
Joined: Jul 2013
Posts: 1,299
Likes: 93
From: Tri-Cities TN
It would be nice to see a comparison with a std hydr. roller cam in a dyno. Both with a dual and single intake.
Something like this, but also with intakes.
https://www.youtube.com/watch?v=8UaX...t5dIHutSOu7srE
Something like this, but also with intakes.
https://www.youtube.com/watch?v=8UaX...t5dIHutSOu7srE
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,791
Likes: 428
From: Aarhus, Denmark
But with my 355 with AFR 195 and 4-Pattern 281QIO8; 2300-6600 RPM.
And install my AFR Titan single intake, that must be good right?
Engine setup today:
355
AFR 195
EZ-EFI 1.0
Comp cams 12-466-8 (EFI cam), 1.6 rocker arms, hydr roller lifter
1 5/8" headers, 2 1/2" exhaust
4 speed
3.70 rear
Edelbrock 2701
Drifting
Joined: Jul 2013
Posts: 1,299
Likes: 93
From: Tri-Cities TN
If you break a V-8 down into 8 single cylinder engines and cam each as an individual engine it makes the engine run much better. Before CNC cylinder head porting became the norm, upper classes like Pro Stock and Winston Cup had cams with multiple lobes.
Those forum members that own boats, Mercury marine stagger jetted carbs for years on V-8 powered boats.
Those forum members that own boats, Mercury marine stagger jetted carbs for years on V-8 powered boats.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,444
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I'm not going to do it.
But with my 355 with AFR 195 and 4-Pattern 281QIO8; 2300-6600 RPM.
And install my AFR Titan single intake, that must be good right?
Engine setup today:
355
AFR 195
EZ-EFI 1.0
Comp cams 12-466-8 (EFI cam), 1.6 rocker arms, hydr roller lifter
1 5/8" headers, 2 1/2" exhaust
4 speed
3.70 rear
Edelbrock 2701
But with my 355 with AFR 195 and 4-Pattern 281QIO8; 2300-6600 RPM.
And install my AFR Titan single intake, that must be good right?
Engine setup today:
355
AFR 195
EZ-EFI 1.0
Comp cams 12-466-8 (EFI cam), 1.6 rocker arms, hydr roller lifter
1 5/8" headers, 2 1/2" exhaust
4 speed
3.70 rear
Edelbrock 2701
I've since changed to bigger motors with altered firing orders and a 5 speed. Manual transmissions are very forgiving of more radical cams.
I looked long and hard at the 4 pattern cam, but when it came to having my solid roller with lobes out of the lobe profile pages and the request for an altered firing order the comp cam guys choked and then they even shipped me a custom billet cam without the agreed upon sleeved on dizzy gear. So I almost got a 4 pattern.
I would tend to go with something more than a 1800-5800 rpm grind with a 4 speed and I would ask about a 4-7 firing order swap. All you have to do is change the plug wire firing order on the cap
Burning Brakes
Joined: Aug 2008
Posts: 878
Likes: 55
From: Deep South Denmark
I had a 7200 rpm very streetable 355 ci for many years with an auto tranny. You have to remember that the original C-5 Z-06 had 405 hp and a 7000 red line.
I've since changed to bigger motors with altered firing orders and a 5 speed. Manual transmissions are very forgiving of more radical cams.
I looked long and hard at the 4 pattern cam, but when it came to having my solid roller with lobes out of the lobe profile pages and the request for an altered firing order the comp cam guys choked and then they even shipped me a custom billet cam without the agreed upon sleeved on dizzy gear. So I almost got a 4 pattern.
I would tend to go with something more than a 1800-5800 rpm grind with a 4 speed and I would ask about a 4-7 firing order swap. All you have to do is change the plug wire firing order on the cap
I've since changed to bigger motors with altered firing orders and a 5 speed. Manual transmissions are very forgiving of more radical cams.
I looked long and hard at the 4 pattern cam, but when it came to having my solid roller with lobes out of the lobe profile pages and the request for an altered firing order the comp cam guys choked and then they even shipped me a custom billet cam without the agreed upon sleeved on dizzy gear. So I almost got a 4 pattern.
I would tend to go with something more than a 1800-5800 rpm grind with a 4 speed and I would ask about a 4-7 firing order swap. All you have to do is change the plug wire firing order on the cap
I've been looking but can't find any.
Drifting
Joined: Jul 2013
Posts: 1,299
Likes: 93
From: Tri-Cities TN
The core is available and any lobe selection can be ground on it. I don't use them unless the stroke is over 4.250" in a BBC. They are not a magical 50HP like some say they are.
Burning Brakes
Joined: Aug 2008
Posts: 878
Likes: 55
From: Deep South Denmark
Drifting
Joined: Jul 2013
Posts: 1,299
Likes: 93
From: Tri-Cities TN
Thread Starter
Safety Car
Joined: Jan 2008
Posts: 3,791
Likes: 428
From: Aarhus, Denmark
I told them to make my cam 4/7 swap, the delivery time was 1 or 2 weeks, as far as I remember.
Last edited by c3_dk; Jul 13, 2016 at 03:10 PM. Reason: added sbc
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
If you are going to flow the heads with the intake manifold and carb the yes this is the way to do it. My stock headed BBC stuff in both Super Stock and Truck pulling has a 3 lobe camshaft on it......intake lobe for the good and bad intake ports of a BBC then 1 for the exhaust port.
Burning Brakes
Joined: Aug 2008
Posts: 878
Likes: 55
From: Deep South Denmark
Great idea!
Last edited by Danish Shark; Jul 13, 2016 at 03:35 PM.