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#1
11-13-2019, 06:49 PM
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670 head valve size mystery
....got 670 head measured intake and exhaust valve size ..exhaust 1.77 but intake measured 2.07....with 5.05 length..... whats going on here ?
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#2
11-13-2019, 10:34 PM
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My 670 heads have the 2.11-1.77 valves. Only thing I can figure is someone may have installed the 2.05 intake valves for use on a 350 engine due to the smaller cylinders. But that is just my guess.
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
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#3
11-13-2019, 11:05 PM
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Perf trick: didn' some folks turn their Valve head diameters down to match the Seat contact?
I lacked the fixtures to do it, but sure tried at the hobo level on some junk valves. |
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#4
11-14-2019, 02:08 AM
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The heads cams offiziell a 428 engine
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#5
11-14-2019, 02:09 AM
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The heads came off a 428
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#6
11-14-2019, 07:30 AM
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The first thing I need to ask is if the valve has a 30 degree seat?
Many Milodon valves that people I have done work for have supplied me with that where said to be 2.11" checked in at 2.10", and even factory valves have been that way at times. When your 2.07" valve is at normal operating temp it will be much closer to the size it should be and not overrun the seat and leave you with a narrow seat that may not seal up well. Another point is that a 2.07" valve helps to unshroud that 670 chamber that needs all the help in that dept that it can get above .430" lift, yet that size valve will not cut into that 670 heads great low lift flow especially at the .250" to .320" lift range.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 11-14-2019 at 07:35 AM. |
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#7
11-17-2019, 09:21 AM
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I believe the 2.08" intake valves I used were Ford size, Manley or Milodon IIRC.
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#8
11-18-2019, 08:02 AM
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So you you are running 45 degree seats?
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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