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Author
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Topic: Rocker Arm Ratio
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FoMoGo
Gearhead Posts: 153
From: Motor City USA
Registered: Feb 2003
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posted 11-13-2003 06:55 PM
 
Anybody know if you can use 1.7 ratio rocker arms on 289 Hipo with the stock hipo cam & pistons. The 1.7 arms would increase the the valve lift from .477 to .507 on both intake & exhaust.
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 11-13-2003 07:39 PM
Yup, sure can and you will like the performance increase and "better" lope sound.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Mooney
Gearhead Posts: 2357
From: Marietta, Ga
Registered: Oct 2003
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posted 11-13-2003 09:24 PM
How do you figure out the effect a higher rocker arm ratio will have on your valve lift?
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 11-13-2003 09:47 PM
Multiply the lobe lift times the rocker ratio.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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69stanger
Journeyman Posts: 77
From: Northridge, CA
Registered: Aug 2002
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posted 11-14-2003 12:41 AM
is the stock rocker arm ration on a 351W 1.5 or 1.6??thanks in advance
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 11-14-2003 10:47 AM
1.6 on ALL SBF W's.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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indyphil
Gearhead Posts: 3394
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 11-14-2003 10:50 AM
It might have been someone on an ebay auction or something but I remember reading somewhere about Carrol shelby using 1.7 rockers or something on the shelby cars?Am I way off base with that? Can I use rockers like that on a C code engine?
Thanks ------------------
'68 coupe 289 C code
66 heads, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 11-15-2003 01:51 PM
No shelby did not use 1.7 rockers on his cars. The BB cars came standard with the FoMoCo 1.73 hydraulic or 1.76 FE solid rockers.
yes you can install 1.7 rockers on your stock "C" code engine.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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luvn69
Journeyman Posts: 55
From: killeen, TX.
Registered: May 2003
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posted 11-23-2003 12:18 AM
quote:
Originally posted by Moneymaker:
Multiply the lobe lift times the rocker ratio.
I was reading what was wrote, I have a 351W. I tried to calculate what you mentioned and I dont think it came up right. My gross lift @lobe is .305 on both I and E with 1.6 RR on stock heads. If I change to a 1.7 the ratio is something like .5185 If this is correct, is this too high for stock 351W heads? and what effect will it have overall?
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