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Edelbrock Victor head porting help please
#376961
07/16/09 07:06 AM
07/16/09 07:06 AM
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Joined: Feb 2006
Posts: 1,051
The Great White North
RAMM
OP
super stock
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OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
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Guys' I really need to pick someone's brain concerning some Victor std port heads I'm working with. First I need to tell you that I have gone with a 2.3" valve with a 5/16 stem--Does not like it at all! I have machined them down to 2.250" with a large .08" margin and the heads loved it. I picked up the flow to tune of 21cfm with that alone. I am now stuck @ about 352cfm @ .700" with way too much FPS on the floor approaching the SS.
These heads seem really unresponsive to almost anything done and want to go turbulent and stall if things aren't spot on. I need to know what the secret to unlocking the flow is with these heads.
I know I'll find the answer here! Thanks guys for any input. J.Rob
2009 PHR\EMC Competitor
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Re: Edelbrock Victor head porting help please
[Re: RAMM]
#376963
07/16/09 02:42 PM
07/16/09 02:42 PM
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Joined: Jan 2003
Posts: 5,486
SoCal
Brian Hafliger
master
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master
Joined: Jan 2003
Posts: 5,486
SoCal
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Quote:
Guys' I really need to pick someone's brain concerning some Victor std port heads I'm working with. First I need to tell you that I have gone with a 2.3" valve with a 5/16 stem--Does not like it at all! I have machined them down to 2.250" with a large .08" margin and the heads loved it. I picked up the flow to tune of 21cfm with that alone. I am now stuck @ about 352cfm @ .700" with way too much FPS on the floor approaching the SS.
These heads seem really unresponsive to almost anything done and want to go turbulent and stall if things aren't spot on. I need to know what the secret to unlocking the flow is with these heads.
I know I'll find the answer here! Thanks guys for any input. J.Rob
When you go to a larger intake valve, you need to maintain a venturi from the roof leading to the bowl and seat area.
If all you did was enlarge the seat/throat, and not shape the bowl to keep the venturi that can be a problem.
Also, you'll find alot of posted flow #'s out there are not factual because of turbulence.
Case in point: I did a set of Dart SB Ford heads for a friend of mine. Nicely ported, fairly heavily.
Port speed was good, csa was good, but flow was not all that. I've had more flow from different castings. But the heads made good HP!
He bought a set of cnc ported AFR heads, and wanted to change them out. I flowed one, and it was almost identical to mine, but the port was slightly smaller...so more efficient.
However, I ported the Dart head for his application, and it ended up making more HP than the AFR head! He lost 1 mph and about a 1/10th in the 1/4.
If I were you, I would throw an intake manifold on that head, and flow it again. Clay the top of the plenum at the carb flange, plug the other 7 ports with tape so you only flow that port from the plenum/carb flange and see if it slows the air down and doesn't stall anymore.
Brian Hafliger
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Re: Edelbrock Victor head porting help please
[Re: Brian Hafliger]
#376964
07/17/09 07:04 AM
07/17/09 07:04 AM
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Joined: Feb 2006
Posts: 1,051
The Great White North
RAMM
OP
super stock
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OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
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Thanks Brian! I have followed your buildup of Gbobs engine and couldn't wait to get my hands on some Victors as a result. I have gone back to a 45 degree seat and the flow was more stable to a little bit higher lift. Should I enlarge the bowl behind the guide leading into the roof? Also my throat is @ 90% about .437" down from the seat. I am using a 1020 for all of these tests @ 28" on a 4.375" bore fixture plate. J.Rob
2009 PHR\EMC Competitor
2010 PHR\EMC Competitor
2011 PHR\EMC Competitor
2012 PHR\EMC Competitor
2013 PHR\EMC Competitor
2014 HotRod/EMC Competitor
2015 HotRod/EMC NoShow
2016 HotRod/EMC 3rd place SPEC Bigblock
2018 HotRod/EMC 7th place G3
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Re: Edelbrock Victor head porting help please
[Re: Brian Hafliger]
#376966
07/17/09 10:52 AM
07/17/09 10:52 AM
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Joined: Feb 2006
Posts: 1,051
The Great White North
RAMM
OP
super stock
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OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
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Brian, thanks again for the response and no I am not chasing these heads for all out flow. What I am really after is a smooth non-turbulent flow up to about .750" I just kinda have my bench mark at 350 cfm because I got one port to do that with a flow curve that I was happy with. What kind of valve angles and seat widths do you find these heads work best with? As far as engine combo goes I'm looking to put these on a 471 combo, 11.5 comp, .700 roller single 4 or tunnel ram. Port cc was 260 untouched is now at 275cc so it's really not that big---yet. Thanks J.Rob
2009 PHR\EMC Competitor
2010 PHR\EMC Competitor
2011 PHR\EMC Competitor
2012 PHR\EMC Competitor
2013 PHR\EMC Competitor
2014 HotRod/EMC Competitor
2015 HotRod/EMC NoShow
2016 HotRod/EMC 3rd place SPEC Bigblock
2018 HotRod/EMC 7th place G3
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