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#1
10-05-2014, 04:44 PM
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Hollow stem valves
I'm building a fairly high rpm 400 for my son's drag car (around the 8500rpm mark), we've got some Manley Titanium retainers and would like to go with Titanium valves but the cost is prohibitive, so we are looking at hollow stem valves instead, has anyone used these? I see Ferrea has some in 11/32" stem, is there a 5/16" hollow stem valve available anywhere? Thanks.
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#2
10-05-2014, 06:07 PM
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Quote:
__________________
Life is hard, it's even harder if your stupid- John Wayne |
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#3
10-06-2014, 07:07 AM
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Road race at what rpm Dan?
__________________
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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#4
10-06-2014, 07:25 AM
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they turn it 8-8200. It is a Ford small block with a flat tappet.
__________________
Life is hard, it's even harder if your stupid- John Wayne |
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#5
10-06-2014, 08:30 AM
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In drag race use I would say that only the intake valve needs to be a hollow type and at that point both valves will be about the same in weight!
__________________
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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#6
10-06-2014, 07:29 PM
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You may be able to get an ex valve in hollow stem with a steeper back angle like 20-25 degree and maintain the same weight. The steeper back angle usually will show an improvement over a normal 10 degree back angle. Run the lightest stuff that you can afford on both sides.
__________________
Life is hard, it's even harder if your stupid- John Wayne |
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