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Update on W2 340 #1543402 12/03/13 11:08 PM 12/03/13 11:08 PM
Joined: Nov 2012 Posts: 358 western PA S Sb Valiant OP enthusiast
Sb Valiant OP enthusiast S Joined: Nov 2012 Posts: 358 western PA	I know some of you guys remember who I am and some of my posts regarding my engine. Finally going to lay some stuff to rest. In our W2 heads we do infact have 2.080" intake valves and 1.600" exhaust. They are the longer valve version. We do need new valves they are old and shot. Another down fall is it's 3/8 stem which isn't good for my application. Will be going to what it looks like a 11/32 valve. Next few things to to do and find out is the head cc's, valve job, guides, and the machine work that is needed. So yes I think the bigger 950 carb and 1 7/8 headers that most reccomended will be positive gains! Brock

Re: Update on W2 340 [Re: Sb Valiant] #1543403 12/04/13 10:43 AM 12/04/13 10:43 AM
Joined: Oct 2007 Posts: 3,978 Hilltown Pa 1967dartgt master
1967dartgt master Joined: Oct 2007 Posts: 3,978 Hilltown Pa	Good luck. Brett Miller W9 cnc'd heads STR Chassis fabraction

Re: Update on W2 340 [Re: 1967dartgt] #1543404 12/04/13 01:49 PM 12/04/13 01:49 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Why not 5/16 or 8mm stems? R.

Re: Update on W2 340 [Re: Sb Valiant] #1543405 12/04/13 02:40 PM 12/04/13 02:40 PM
Joined: Jul 2004 Posts: 19,318 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,318 State of confusion	Quote: I know some of you guys remember who I am and some of my posts regarding my engine. Finally going to lay some stuff to rest. In our W2 heads we do infact have 2.080" intake valves and 1.600" exhaust. They are the longer valve version. We do need new valves they are old and shot. Another down fall is it's 3/8 stem which isn't good for my application. Will be going to what it looks like a 11/32 valve. Next few things to to do and find out is the head cc's, valve job, guides, and the machine work that is needed. So yes I think the bigger 950 carb and 1 7/8 headers that most reccomended will be positive gains! Brock Who`s setten em up for ya? 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Update on W2 340 [Re: dogdays] #1543406 12/04/13 03:39 PM 12/04/13 03:39 PM
Joined: Nov 2012 Posts: 358 western PA S Sb Valiant OP enthusiast
Sb Valiant OP enthusiast S Joined: Nov 2012 Posts: 358 western PA	I really didn't think of that but it's nice to also be able to use something common and easier to get unless those sizes are not a major problem to do..

Re: Update on W2 340 [Re: Thumperdart] #1543407 12/04/13 03:40 PM 12/04/13 03:40 PM
Joined: Nov 2012 Posts: 358 western PA S Sb Valiant OP enthusiast
Sb Valiant OP enthusiast S Joined: Nov 2012 Posts: 358 western PA	My boss and I at the machine shop I work at

Re: Update on W2 340 [Re: Sb Valiant] #1543408 12/04/13 04:47 PM 12/04/13 04:47 PM
Joined: Jul 2004 Posts: 19,318 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,318 State of confusion	Quote: My boss and I at the machine shop I work at Cool............... 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Update on W2 340 [Re: Thumperdart] #1543409 12/04/13 07:11 PM 12/04/13 07:11 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	What's the valve stem diameter on a Hemi? 5/16" G3 Hemi? 8mm, IIRC. Racers have been using 5/16 or 8mm stems to save weight on valves for 30 years or more. NASCAR type motors are running 7mm and even I've heard of some 6mm stems, that's pretty doggone small, makes me wonder. But IMHO as long as you're replacing guides, go to a common smaller size, and that's 5/16 or 8mm. R.

Re: Update on W2 340 [Re: dogdays] #1543410 12/04/13 07:48 PM 12/04/13 07:48 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: What's the valve stem diameter on a Hemi? 5/16" G3 Hemi? 8mm, IIRC. Racers have been using 5/16 or 8mm stems to save weight on valves for 30 years or more. NASCAR type motors are running 7mm and even I've heard of some 6mm stems, that's pretty doggone small, makes me wonder. But IMHO as long as you're replacing guides, go to a common smaller size, and that's 5/16 or 8mm. R. He should look at whats available in the 2.08 size and the length needed... some of the companies will make certain lengths in certain sizes... I went with the 11/32 stems on mine.... sure he might be able to get 5/16 but at twice the price

Re: Update on W2 340 [Re: MR_P_BODY] #1543411 12/04/13 08:43 PM 12/04/13 08:43 PM
Joined: Nov 2012 Posts: 358 western PA S Sb Valiant OP enthusiast
Sb Valiant OP enthusiast S Joined: Nov 2012 Posts: 358 western PA	X2 on what Mr. P said. I have heard of a old trick about taking a hemi valve and cutting it to size and putting them in W2's being that they were lighter which would be the 5/16 stem like dogdays had mentioned . But how long is a smaller stem valve like that going to last and wouldn't it break easier ? I have the standard length valve setup in my W2's after asking Mr. P some questions. Thanks again

Re: Update on W2 340 [Re: Sb Valiant] #1543412 12/05/13 01:47 PM 12/05/13 01:47 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Dudes, I don't know how much they cost. That's for you to find out. But break? I wondered about that too, how does 500 miles with big springs at 9000 rpm sound? NASCAR. That's where they have downsized the stems to 7 and maybe even 6mm. If G2 and G3 Hemis can run'em stock, why would they have durability problems in a Wedge? R.

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