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OEM SB 308 Head Flow #596555 01/28/10 02:01 PM 01/28/10 02:01 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	I've been looking at these things on the shelf for a while, wondering what they would flow straight off an engine. OEM valve job with .100" wide seat. I touched up the 45� on both valves, just enough to clean them. .................. IN .................................... EX .100"_______54.0______________________51.8 .200"______108.3______________________99.7 .300"______163.6_____________________135.5 .400"______194.9_____________________152.3 .500"______207.9_____________________157.2 .550"______207.9_____________________157.2 .600"______B/UP______________________*** *** guide prevented further lift Intake port backs up above .550" lift. 5765914-4448308Heads001.jpg (467 downloads)

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596556 01/28/10 02:04 PM 01/28/10 02:04 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	OEM 1.88" and 1.60" valves 5765920-4448308Heads010.jpg (556 downloads)

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596557 01/28/10 02:12 PM 01/28/10 02:12 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Tulip valve required between 24.5� and 25� back cut to blend into back angle. Results of using this valve with no other modifications. .100"_______61.4 .200"______122.6 .300"______173.4 .400"______196.8 .500"______196.8 .550"______196.8 .600"______196.8 .650"______196.8 Again, I ran out of travel but, obviously saturated. I guess "stalled" is a better term since, it can flow more than 196.8 5765933-4448308Heads008.jpg (422 downloads) Last edited by S/ST 3040; 01/28/10 04:42 PM.

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596558 01/28/10 02:16 PM 01/28/10 02:16 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Pushrod pinch is .750" wide. 5765942-4448308Heads006.jpg (539 downloads)

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596559 01/28/10 02:19 PM 01/28/10 02:19 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	......because 5765950-4448308Heads002.jpg (568 downloads)

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596560 01/28/10 02:24 PM 01/28/10 02:24 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	OEM intake seat. 5765961-4448308Heads004.jpg (919 downloads)

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596561 01/28/10 03:31 PM 01/28/10 03:31 PM
Joined: Sep 2004 Posts: 2,096 oberlin, Ohio Rapid340 top fuel
Rapid340 top fuel Joined: Sep 2004 Posts: 2,096 oberlin, Ohio	The low lift flow went up by almost 14% with the back cut. 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: OEM SB 308 Head Flow [Re: Rapid340] #596562 01/28/10 03:46 PM 01/28/10 03:46 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Anybody familiar with OEM valves may remember the pronounced ridge on the back side. 5766104-4448308Heads016.jpg (455 downloads)

Re: OEM SB 308 Head Flow [Re: Rapid340] #596563 01/28/10 03:47 PM 01/28/10 03:47 PM
Joined: Jan 2003 Posts: 16,123 Grand Haven, MI patrick I Live Here
patrick I Live Here Joined: Jan 2003 Posts: 16,123 Grand Haven, MI	your peak flow with the back cut is about what I would've expected OOTB, ~195... 1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod SOLD!* 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)

Re: OEM SB 308 Head Flow [Re: patrick] #596564 01/28/10 03:57 PM 01/28/10 03:57 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Yeah, I'm not seeing anything special here. 5766123-4448308Heads013.jpg (808 downloads)

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596565 01/28/10 04:01 PM 01/28/10 04:01 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	They appear to be about as "Swirl" inducing as any 587-up LA head I've ever seen. 5766133-4448308Heads015.jpg (506 downloads)

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596566 01/28/10 04:28 PM 01/28/10 04:28 PM
Joined: Aug 2003 Posts: 3,250 Between a rock & a hard place C cudadoug master
cudadoug master C Joined: Aug 2003 Posts: 3,250 Between a rock & a hard place	Now what's your plan? I'd be curious to know how many hours (=$$) it would take to get them to flow around 240-ish, or equal to a RHS/X or EQ Magnum head...

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596567 01/28/10 04:30 PM 01/28/10 04:30 PM
Joined: Feb 2004 Posts: 4,501 Gainesville,FL G goldmember master
goldmember master G Joined: Feb 2004 Posts: 4,501 Gainesville,FL	Quote: ......because I was talking with Larry Meaux a couple of years ago(great guy) and he had quite a few that came without the pushrod hole machined for obvious reasons.

Re: OEM SB 308 Head Flow [Re: cudadoug] #596568 01/28/10 04:37 PM 01/28/10 04:37 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: Now what's your plan? I'd be curious to know how many hours (=$$) it would take to get them to flow around 240-ish, or equal to a RHS/X or EQ Magnum head... No plan, as of now. I was just breaking up the day from my regular grinding duties. 240 CFM would be easy.

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596569 01/28/10 05:44 PM 01/28/10 05:44 PM
Joined: Sep 2004 Posts: 2,096 oberlin, Ohio Rapid340 top fuel
Rapid340 top fuel Joined: Sep 2004 Posts: 2,096 oberlin, Ohio	Quote: They appear to be about as "Swirl" inducing as any 587-up LA head I've ever seen. The swirl is produced by the runner. (and the pronounced pushrod pinch). I have never seen anything unique about the 308 chamber either. 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: OEM SB 308 Head Flow [Re: Rapid340] #596570 01/28/10 05:50 PM 01/28/10 05:50 PM
Joined: Sep 2004 Posts: 2,096 oberlin, Ohio Rapid340 top fuel
Rapid340 top fuel Joined: Sep 2004 Posts: 2,096 oberlin, Ohio	Quote: 240 CFM would be easy. I got 278 CFM out of the intake by starting with the MP template kit (no longer available) and adding some other extras like raising the roof. I'm sure Vic could produce a lot better low lift numbers than I but the pushrod pinch limits peak flow. 1971 Factory Appearing Duster 340 11.000 @ 122 mph

Re: OEM SB 308 Head Flow [Re: cudadoug] #596571 01/28/10 07:27 PM 01/28/10 07:27 PM
Joined: Jul 2005 Posts: 428 wappinger falls new york J Jimi_Vignogna mopar
Jimi_Vignogna mopar J Joined: Jul 2005 Posts: 428 wappinger falls new york	Quote: Now what's your plan? I'd be curious to know how many hours (=$$) it would take to get them to flow around 240-ish, or equal to a RHS/X or EQ Magnum head... i did a set of 1.88 intake valve heads for a 318 volare stocker and with out porting and cover up got them to flow 234 @ .450 , the best 308 s/s head i ever did was 272 cfm at .700 https://www.facebook.com/VignognaRacingEngines

Re: OEM SB 308 Head Flow [Re: S/ST 3040] #596572 01/28/10 09:52 PM 01/28/10 09:52 PM
Joined: Jan 2003 Posts: 1,634 Petersburg, Va D Darrell top fuel
Darrell top fuel D Joined: Jan 2003 Posts: 1,634 Petersburg, Va	Quote: They appear to be about as "Swirl" inducing as any 587-up LA head I've ever seen. But the exhause radius is so much better, I have a set on my 450 lift 318 with 8.2 CR and would love to try them on a higher CR 340 or 360.

Re: OEM SB 308 Head Flow [Re: Darrell] #596573 01/28/10 09:58 PM 01/28/10 09:58 PM
Joined: Mar 2005 Posts: 3,445 N.Wilkesboro,NC D DusterKrazy master
DusterKrazy master D Joined: Mar 2005 Posts: 3,445 N.Wilkesboro,NC	The 308's are pre-magnum right? What years would I need to look for?

Re: OEM SB 308 Head Flow [Re: DusterKrazy] #596574 01/28/10 10:01 PM 01/28/10 10:01 PM
Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere S S/ST 3040 OP master
S/ST 3040 OP master S Joined: Jul 2006 Posts: 4,595 On the south side of Nowhere	Quote: The 308's are pre-magnum right? What years would I need to look for? Correct. 88-91 360 only.

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