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

xdclevo

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.

spazz

Thats what i have heard also.some people still swear buy a single pattern?

ALKY

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
ALKY

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

azza

I would say go to 2V heads instead.
AZZA

spazz

Cant, the car is a genuine Gt with 4v heads.

ALKY

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
ALKY

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.

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4Vman

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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