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terrylittlejohn
Turbo Slant 6
Joined: 17 May 2005
Posts: 967
Location: CBS Newfoundland Canada
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Post subject:
ebay valves
(Mon Mar 12, 2012 5:53 pm)
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any body see these valves 300 ford Item number:
270786862573 just wondering what everyone think of these for a performance build.
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Ceej
SSRN National Champion
Joined: 31 Mar 2003
Posts: 6454
Location: Oregon
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Post subject:
(Mon Mar 12, 2012 7:28 pm)
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I think they are going to touch each other in a slant head. 
What overbore have you got?
Your going to need a minimum .060 over, and they are going to mask on the bore pretty heavily. I have 1.540" Exhausts that have been face and back cut to keep them off the cylinder walls.
If your running 0.100" Overbore, it may not be an issue, but make certain to correct the dowls if the chambers don't precisely center over the bore. I bent three exhaust valves when they wacked the cylinder wall.
My gut reaction is; Too Big.
CJ_________________ 
Tyrde-Browne Racing
I'm off to find myself. If I should return before I get back, keep me here. |
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terrylittlejohn
Turbo Slant 6
Joined: 17 May 2005
Posts: 967
Location: CBS Newfoundland Canada
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Post subject:
(Tue Mar 13, 2012 1:55 am)
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| i am using 360cid valves cut to 1.80int/160ex with a notched .060 over bore. i am thinking of doing a new head and have read here of some members using 300cid ford valves. the head i have has rusted through #6ex port and ex valves are pitted bad from sitting to long as backup motor. the engine it going on is my .080 over blown engine. just wondering if these are the valves most use i know i will have to do everything for 11/32 stems.thanks terry
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Dart270
Board Sponsor & Moderator
Joined: 21 Oct 2002
Posts: 9653
Location: Blacksburg, VA
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Post subject:
(Tue Mar 13, 2012 4:55 am)
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Most racers I know have found that 1.76/1.50 is about as big as you want to go on a 0.100" or less overbore motor. Valve shrouding takes away any gains with bigger diameters. I have seen a 1.84/1.44 head where the int valve was moved toward the middle about 0.040-0.060". That worked well.
I have a 1.84/1.54 head I bought off a racer 15 yrs ago and it has never been run. About 0.025-0.030" between the valves, so at the limit. I keep looking for a combo it would work with...
Lou
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Return of the 64 Dart. Hang on...
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Fopar
6 Pack Dart
Joined: 02 Nov 2002
Posts: 1919
Location: Eugene, Oregon
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Joshua Skinner
Supercharged
Joined: 27 Jan 2005
Posts: 6479
Location: Portland, Oregon
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Post subject:
(Tue Mar 13, 2012 12:00 pm)
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| When I did a big valve head around 1999 I used Ford 300 valves and had the exhausts cut down to 1.45". That head was used on a 3.43" bore engine.
_________________
Joshua Skinner
car nut, telecom tech, tool using mammal
'72 Dart Swinger
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1974duster kev
Turbo Slant 6
Joined: 13 Jul 2007
Posts: 627
Location: clearwater florida
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Post subject:
(Tue Mar 13, 2012 12:01 pm)
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I took the easy way out and used the ebay engn builder valves with .040 overbore.
Kev_________________  |
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terrylittlejohn
Turbo Slant 6
Joined: 17 May 2005
Posts: 967
Location: CBS Newfoundland Canada
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Post subject:
(Tue Mar 13, 2012 3:18 pm)
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| fopar did you use the 4.75" or the 4.81" over all lenght valves? the sb dodge valves i have are 4.77" length.
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Fopar
6 Pack Dart
Joined: 02 Nov 2002
Posts: 1919
Location: Eugene, Oregon
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Post subject:
(Tue Mar 13, 2012 3:37 pm)
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I didn't measure the machine shop did the work. From what I recall the Ford valves are 0.010" longer than the slant valves.
Richard_________________  
Part of Tyrde-Browne Racing |
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