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Old 09-19-2004, 06:30   #1 (permalink)
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confused Phase III & IV GTHO Cam Specs

I'm hoping that somewhere out there someone can help me with the original camshaft specs released/published by Ford for both the Phase III HO and the "still born" Phase IV HO. The latter is of special interest as it was rated "top secret" by Ford and never made it to the parts listings, nor were the specs ever put to print. Would welcome any feedback/leads available.
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Old 09-19-2004, 07:13   #2 (permalink)
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Re: Phase III & IV GTHO Cam Specs

Try www.fouronthefloor.com.au heaps of gtho info there might be what youre looking for
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Old 09-19-2004, 21:04   #3 (permalink)
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Re: Phase III & IV GTHO Cam Specs

I dont have the exact specs on hand, but the Phase 3's used two cams. Both were around 300 degrees advertised duration. One had just under .500 lift, the other just over.

Dont know about the Phase 4 cams, but its really a moot point. The only Phase 4 i've seen had what appeared to be a straight GT motor in it. And since it also had factory air, that would rule out a weapon of a cam.
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Old 09-20-2004, 06:54   #4 (permalink)
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Re: Phase III & IV GTHO Cam Specs

Thats an awesome link, just love that Super Falcon
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Old 09-20-2004, 07:16   #5 (permalink)
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Re: Phase III & IV GTHO Cam Specs

if anyone has the book "spotlight on ford" on GT falcons?

my dad has it, next time i'm round there i'll have a look... it has the exact specs of near-on every component of the early GT motors
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Old 09-22-2004, 01:26   #6 (permalink)
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Re: Phase III & IV GTHO Cam Specs

direct quote from precision master engine parts catalogue:

part numberC330 = mechanical (GTHO phase 3)

valve timing @ .050"cam lift
inlet opens 17 btdc
inlet closes 47 abdc
duration 244

Exhaust opens 54 bbdc
exhaust closes 20 atdc
duration 254
inlet lift at valve .569
exhaust lift at valve .590
inlet lobe lift at top dead centre .097
tappet clearance .026 "
lobe seperation 106"
as to your question regarding phase 4 camshaft it was supposed to be of greater specification than the phase 3 but someone somewhere will know.
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Old 09-22-2004, 01:27   #7 (permalink)
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Re: Phase III & IV GTHO Cam Specs

direct quote from precision master engine parts catalogue:

part number: PC330 = mechanical (GTHO phase 3)

valve timing @ .050"cam lift
inlet opens 17 btdc
inlet closes 47 abdc
duration 244

Exhaust opens 54 bbdc
exhaust closes 20 atdc
duration 254
inlet lift at valve .569
exhaust lift at valve .590
inlet lobe lift at top dead centre .097
tappet clearance .026 "
lobe seperation 106"
as to your question regarding phase 4 camshaft it was supposed to be of greater specification than the phase 3 but someone somewhere will know.
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Old 09-22-2004, 02:11   #8 (permalink)
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Re: Phase III & IV GTHO Cam Specs

I'm rather suprised by that - I didn't think the cams they ran were as meaty as that.

Can see it would still be a good choice of cam present day.
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Old 09-22-2004, 02:29   #9 (permalink)
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Re: Phase III & IV GTHO Cam Specs

I would be very surprised if that's the case. They should be about boss 351 specs.
That's bigger than the cam in my car now and it's way faster than a phase 3 with similar weight and gearing.
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Old 09-22-2004, 05:03   #10 (permalink)
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Re: Phase III & IV GTHO Cam Specs

Think I read somewhere yrs ago that the Phase 4 had a smaller cam than Phase 3 due to more efficient heads and inlet and the better body shape.
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