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Re: Gains switching to larger intake valve [Re: theclutcher] #468411 09/16/09 09:37 AM 09/16/09 09:37 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: Quote: Quote: Quote: Probably no gain unless you unshroud the valve by machining the combustion chamber. if that is shrouded, you can expect very little then bore size comes into play. imo... Anytime I've tried unshrouding the intake valve (straight wall side) on an OEM head, it hurt flow. I haven't tried it on the RPM though. That is interesting, Have only seen the opposite. Hmmmm..........3 notebooks full notes and a flow bench is pretty handy. 5485887-DSCN1396.JPG (24 downloads)

Re: Gains switching to larger intake valve [Re: S/ST 3040] #468412 09/16/09 09:52 AM 09/16/09 09:52 AM
Joined: Mar 2005 Posts: 2,172 Ohio T theclutcher top fuel
theclutcher top fuel T Joined: Mar 2005 Posts: 2,172 Ohio	Quote: Quote: Quote: Quote: Quote: Probably no gain unless you unshroud the valve by machining the combustion chamber. if that is shrouded, you can expect very little then bore size comes into play. imo... Anytime I've tried unshrouding the intake valve (straight wall side) on an OEM head, it hurt flow. I haven't tried it on the RPM though. That is interesting, Have only seen the opposite. Hmmmm..........3 notebooks full notes and a flow bench is pretty handy. cant argue with that, just the few Ive had experience with always picked up, big or small block when opening up that area. wonder what the difference could be?

Re: Gains switching to larger intake valve [Re: theclutcher] #468413 09/16/09 10:04 AM 09/16/09 10:04 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Scott.....I know the OEM big block heads do like opening that up, the more, the better, I understand but, it always screws up the high lift flow on my small block heads. Dwayne Porter and I discussed this once in conversation as, we both found the same thing.

Re: Gains switching to larger intake valve [Re: S/ST 3040] #468414 09/17/09 08:59 AM 09/17/09 08:59 AM
Joined: Mar 2005 Posts: 2,172 Ohio T theclutcher top fuel
theclutcher top fuel T Joined: Mar 2005 Posts: 2,172 Ohio	Hi Vic. At what lifts you see the reduction? Would not come into play too much if cam doesnt see time spent at that lift point. wondering if plusses if any at low lift more than offset the loss at high point. what have you seen?

Re: Gains switching to larger intake valve [Re: theclutcher] #468415 09/17/09 09:18 AM 09/17/09 09:18 AM
Joined: Feb 2003 Posts: 4,953 Houston, Texas TheOtherDodge master
TheOtherDodge master Joined: Feb 2003 Posts: 4,953 Houston, Texas	Hey Josh! Long time no talk! I think switching to the 2.05 valve is more expensive/time consuming than the improvement you will see (valve job, cut seats, new valve, set up springs, intake gaskets, head gaskets, antifreeze, oil, etc). I would concentrate on weight, particularly the hood where you will get a lot of weight off the nose. Tell your dad "hi" for me!

Re: Gains switching to larger intake valve [Re: theclutcher] #468416 09/17/09 09:31 AM 09/17/09 09:31 AM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 master
S/ST 3040 master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	OEM SB Casting #974 Manley Pro-Flo 2.02" x 30� BC .............BEFORE.........................................AFTER .100"_____62.0____________________________62.4 .200"____127.3___________________________128.9 .300"____188.9___________________________192.1 .400"____241.8___________________________240.2 .500"____269.8___________________________268.0 .550"____268.0___________________________** .600"____269.2___________________________266.2 .650"____269.9___________________________268.3 .700"____273.3___________________________268.3 ** - Turbulent/Noisy

Re: Gains switching to larger intake valve [Re: S/ST 3040] #468417 09/17/09 09:34 AM 09/17/09 09:34 AM
Joined: May 2004 Posts: 1,151 Las Vegas A afxcoronet super stock
afxcoronet super stock A Joined: May 2004 Posts: 1,151 Las Vegas	Josh, just leave it alone, and get started on the Dart... Taking over the World one win light at a time.

Re: Gains switching to larger intake valve [Re: TheOtherDodge] #468418 09/17/09 12:50 PM 09/17/09 12:50 PM
Joined: Dec 2004 Posts: 415 New Braunfels, TX 4 416challenger OP mopar
416challenger OP mopar 4 Joined: Dec 2004 Posts: 415 New Braunfels, TX	James- I figured since I was already going to be freshing the motor I would ask the question, but It sounds like it isn't a worth while investment. Now I just have to find a hood. Curtis- The Dart isn't going to happen anytime soon, we just put Mackenzie is preschool.

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