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Author
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Topic: Edelbrock Performer RPM Question
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grandestang
Gearhead Posts: 375
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 06-28-2003 02:13 AM
   
When I tear into my 351W in a short while, I hope to find everything still allright to avoid the expense of a total rebuild. I have looked into the possibility of upgrading the heads and I really like the Performer RPMs. Since I am hoping that everything is still in spec, so I don't have to replace the pistons, I'm leaning towards the RPMs with the 1.9" intake valves. This will allow me to keep the stock pistons as the 2.02s would call for modification. So the question is.... Are the RPMs with the 1.9" inch intakes going to be significantly worse than the 2.02s in terms of flow? Would the added benefit of 2.02"s call for replacing or modififying the pistons anyway? I don't think it would make much of a difference, but what are your opinions?
This is a street machine/occasional racer, not pure drag racerThanks, Paul ------------------
1970 Grande
H code 351W FMX
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Moneymaker
Administrator Posts: 26813
From: Lyons, IL, USA
Registered: May 99
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posted 06-28-2003 03:12 PM
Excellent choice.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
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: 2690
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 06-28-2003 07:09 PM
From what other people have said (its not like I have done a comparison test myself)
it seems the 1.9 inch valves will work better on an engine that likes a little more low end torque by keeping the velocity up as it goes past the valve. As you go bigger the flow gets bigger but you lose bottom end torque. For a street motor I think the 1.9s are the way to go. Having said that Im saving up for AFR heads.http://home.isoa.net/~mharrisj/fordhead.html use that site as a guide, although I cannot verify the accuracy and I did not ask permission to link to his page. Thats naughty of me.
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'68 coupe 289 C code
66 heads, edel 600cfm carb, performer intake, dual exhaust
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grandestang
Gearhead Posts: 375
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 06-29-2003 01:41 AM
Thanks indy, it would be a big bonus to be able to use the stock pistons too. Looking at those flow numbers the peformer 5.0s don't even give up to the Victor Jrs. until .5 or .6 lift on the intake. That just confirms the belief that they may be beter for the street. So I guess when it gets to it if I have to bore the cylinders and use new pistons then the 2.02s but if no then the 1.9s. thanks againPaul
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ccode67
Gearhead Posts: 2895
From: douglasville,ga,usa
Registered: Mar 2001
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posted 06-30-2003 07:00 AM
Performer rpm with 1.90 valves on my 351, they work real well on this motor, about 9.8 to 1 compression and rpm intake and cam.
Quarter mile- 13.63@105
Eighth mile- 8.60@84
With no traction, spinning through 2nd gear.------------------
Stuart
MCA #48902
M&M #1091
67 stang 5 speed, 351W,
Edelbrock Performer RPM package my photo page
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69redmach1
Journeyman Posts: 11
From: Central NH
Registered: May 2002
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posted 06-30-2003 08:15 PM
Check out Edelbrock's flow data. The 2.02 valves flow 1 cfm more at .500 and .600 lift than the 1.90 valves. I don't see why they would be worth running. I had 1.90 valved heads on my 351W and pulled a best of 12.62@108mph. They work well.
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grandestang
Gearhead Posts: 375
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 07-01-2003 10:53 PM
ccode67 and 69redmach1- that's exactly what I wanted to hear. Thanks alot, that just confirms my willingness to go for the 1.9s. Especially with the power you guys get out of em'.Paul
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