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Old 07-11-2006, 14:59   #1 (permalink)
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Smile Difference between single pattern and dual pattern cam

Hi guys,

Can someone please tell me the pros and cons of sinlge pattern cam vs dual pattern? How do they effect the performance of the car? Which would make more torque and horsepower in a stock stroke 351c 4v, 780 holley, performer manifold, pacemaker 4into 1 pipes, twin 3 inch, power band of 3000 to 6000. Will be more street blasting than drag racing. All opinions are appreciated.

Cheers Spazz
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Old 07-11-2006, 19:17   #2 (permalink)
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Re: Difference between single pattern and dual pattern cam

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Originally Posted by spazz
Hi guys,

Can someone please tell me the pros and cons of sinlge pattern cam vs dual pattern? How do they effect the performance of the car? Which would make more torque and horsepower in a stock stroke 351c 4v, 780 holley, performer manifold, pacemaker 4into 1 pipes, twin 3 inch, power band of 3000 to 6000. Will be more street blasting than drag racing. All opinions are appreciated.

Cheers Spazz
From what i understand, it was the 4V heads that waranted extra lift and duration on the exhaust side of the cam. They had great inlet flow, but lacked a bit on the exhaust side. That is why the F238, F246 etc had duel patern. Also, street cars have full exhaust systems which are an extra restriction, so a dual pattern is even recommended on the newer type alloy heads, but not to the extent of the 4V's.
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Old 07-11-2006, 19:35   #3 (permalink)
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Re: Difference between single pattern and dual pattern cam

Thats what i have heard also.some people still swear buy a single pattern?
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Old 07-11-2006, 20:53   #4 (permalink)
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Re: Difference between single pattern and dual pattern cam

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Thats what i have heard also.some people still swear buy a single pattern?
THATS COS THEY HAVE NEVER TRY A DUAL PATTEN CAM THEY ARE STILL LIVING IN THE PAST. FORD HEADS TRADITONALLY FLOW AROUND 60-65%
INTAKE TO EXHAUST SO A SPLIT GRIND CAM FIXES THIS FLOW PROBLEM, BUT ANY MOTOR WILL BENIFIT FROM A DUAL PATERN
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Old 07-11-2006, 21:47   #5 (permalink)
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Re: Difference between single pattern and dual pattern cam

Cheers mate,

A quick one for you, what do you reckon of Wade cams?
They have a Hyd grind, No .1474 Dual pattern, 240 EXH 232 Inlet.
543 Exh, 541 Inlet lift, with a 108 Lobe sep. Do you reckon it might work well?Also do you think the motor will benefit from port tongues on the inlet ?

Cheers Spaz
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Old 07-11-2006, 22:30   #6 (permalink)
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Re: Difference between single pattern and dual pattern cam

I would say go to 2V heads instead.
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Old 07-11-2006, 22:56   #7 (permalink)
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Re: Difference between single pattern and dual pattern cam

Cant, the car is a genuine Gt with 4v heads.
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Old 07-11-2006, 23:08   #8 (permalink)
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Re: Difference between single pattern and dual pattern cam

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Originally Posted by spazz
Cheers mate,

A quick one for you, what do you reckon of Wade cams?
They have a Hyd grind, No .1474 Dual pattern, 240 EXH 232 Inlet.
543 Exh, 541 Inlet lift, with a 108 Lobe sep. Do you reckon it might work well?Also do you think the motor will benefit from port tongues on the inlet ?

Cheers Spaz
WADE CAMS ARE OK MOST GRINDERS IN THIS COUNTRY DO A GOOD JOB THERE ARE SOME THAT DONT BUT THEY DONT LAST LONG . PORT PLATES WOULD BE A MUST ON A 4V
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Old 07-11-2006, 23:11   #9 (permalink)
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Re: Difference between single pattern and dual pattern cam

I had Clive from Clive/wade cams select my last cam for the 4v irons, he said a duel pattern cam was not needed and that the boys in the U.S have been using single pattern for years.
I ended up with 262/262 and 590 lift @ 50, i was quite happy with the performance it made 255rwkw behind a C6 and felt strong on the road.

Alky, hit the capslock button dude.
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Old 07-11-2006, 23:42   #10 (permalink)
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Re: Difference between single pattern and dual pattern cam

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Originally Posted by falcon coupe
I had Clive from Clive/wade cams select my last cam for the 4v irons, he said a duel pattern cam was not needed and that the boys in the U.S have been using single pattern for years.
I ended up with 262/262 and 590 lift @ 50, i was quite happy with the performance it made 255rwkw behind a C6 and felt strong on the road.

Alky, hit the capslock button dude.
Clive did mine as a duel pattern (F238ish size), but most Bigger clevo CAMS (over 260@50 dur) seem to be single pattern.
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