rocker size help
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Joined: May 2005
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From: geneva IL
rocker size help
Built a 351 and right now I have 1:6 scorpion roller rockers sitting on a set alum.eldelbrock heads with a ford E-303 cam. Would there be a better outcome if I were to up grade to 1:7 and make that cam performed better any input would be helpful thanks
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From: western montana
Originally Posted by Torque1st
The guys that know the 351W best are here!
I was going with 1.7 to get more lift. If I remember right a cam that had, say .45 lift with a 1.6 would obtain almost .48 with the 1.7 ratio...theres a simple formula to figure it out (current lift divided by 1.6 multiplied by 1.7). It doesn't lengthen duration but you get increased lift within the same distance, time etc. Personally I like the concept of lift- if not overdone. you get the valve higher faster and that should help low end power...i think.
Now someone who knows what they are talking about will help.....
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The Ecam has been used by a lot of people with 1.7's, but I'd hate to be the one in 100 were a collision occured. The lift with 1.7's is .530. With most 302/351w heads the extra lift does make significant difference though.
Are the Edelbrocks your using 1.94" intakes or 2.02"? If they are 1.94 it might be okay, but most of these guys running the Ecam with 1.7's, are running E7's or GT40's. If they are 2.02, and the pistons are stock, then don't do it. If your head flow up to .500 is good and there's not that much to be gained by the extra lift, it may not be worth the risk.
Are the Edelbrocks your using 1.94" intakes or 2.02"? If they are 1.94 it might be okay, but most of these guys running the Ecam with 1.7's, are running E7's or GT40's. If they are 2.02, and the pistons are stock, then don't do it. If your head flow up to .500 is good and there's not that much to be gained by the extra lift, it may not be worth the risk.
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From: Calhoun GA
Originally Posted by roger dowty
pedestal vs stud?
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I looked up the flow numbers on Edelbrock heads. Edelbrock heads like a few other aftermarket heads have most of there total flow at lower lift, with high port velocities, and don't really need high valve lifts, like the more stock type heads, to obtain the maximal flow potential. There's only 3 cfm more flow at .600 valve lift compared to .500 lift, and the flow at .450 is almost as much as .500.
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From: Calhoun GA
It's possible, but I'm not sure the gains will be worth it in a heavy brick like that with 4 wheel drive.
Keep the 1.6's on there and we'll throw my intercooled Vortech kit on your rig when I start the turbo build. However, you have to come and pick everything up 'cause I aint shippin' all this stuff brother!
Keep the 1.6's on there and we'll throw my intercooled Vortech kit on your rig when I start the turbo build. However, you have to come and pick everything up 'cause I aint shippin' all this stuff brother!
Hotshot
Joined: May 2004
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From: The hills of No. Calif.
Hold on Matt...if you're giving that stuff away, it would make my 5.0 Ranger very happy... 
And I've been planning a twin-turbo 5.0 for the Tiger for quite a while now, I think I have the clearance issues about worked out. But that's another project...
And I've been planning a twin-turbo 5.0 for the Tiger for quite a while now, I think I have the clearance issues about worked out. But that's another project...
Last edited by TigerDan; Sep 5, 2006 at 09:11 PM.