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#1
10-10-2020, 03:25 PM
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RA-4 valves installed on 6X-4 heads
I came across a set of RA-4 titanium intake valves and am thinking of putting them in a set of 6X-4, update the springs to .540 lift... need input in exhaust valves , porting work (gasket matched/RA-4) and building a nice 428
Thanks Tom |
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#2
10-10-2020, 04:43 PM
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With the taller valves, you will need longer pushrods for the intakes.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#3
10-10-2020, 05:18 PM
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Ok I can do that
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#4
10-10-2020, 10:40 PM
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I am glad that they are titanium intake valves (one piece) vs a factory RA-IV valve which is a two piece valve originally before welding and there have been cases where the head came off of the stem with Roller Cam Spring Pressures.
Jim Brady's engine being one example of this happening to a PY member. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#5
10-11-2020, 05:43 AM
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Don't waste your time, as the tulip back side of the True RA4 type Intake valves will work against you in a running Factory D ported headed motor flow wise, plus a Titanium valve can not be run in cast iron valve guides if that's the case with your heads!
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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! |
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