1.7 RR's?
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Junior Member
Joined: Dec 2003
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1.7 RR's?
This is my first post on this informative board.
I did a breif searh for some answers but thought I'd ask it again anyways!
I have a '97 4.6.
1. Does it have 1.6 stamped steel rockers now?
2. Are there any gains by going to 1.7 RR's? I know the friction would be reduced but how does the extra lift react?
3. Can they be used with the stock valve covers?
4. What brands are reccomended (price is a factor)?
The other mods I would be doing at the same time are, cold air intake, shorty headers.
I read a 75mm throttle body isn't worth much, true?
Any other reccomendations are appreciated!
Thanks,
James
I did a breif searh for some answers but thought I'd ask it again anyways!
I have a '97 4.6.
1. Does it have 1.6 stamped steel rockers now?
2. Are there any gains by going to 1.7 RR's? I know the friction would be reduced but how does the extra lift react?
3. Can they be used with the stock valve covers?
4. What brands are reccomended (price is a factor)?
The other mods I would be doing at the same time are, cold air intake, shorty headers.
I read a 75mm throttle body isn't worth much, true?
Any other reccomendations are appreciated!
Thanks,
James
Senior Member
Joined: Oct 2000
Posts: 598
Likes: 0
From: southington ct usa
There are no rockers on a 4.6. They are cam followers.The stock ratio is 1:8.
They make roller followers
http://www.secondstreetspeed.com/
also see this thread, big coin for the gain.
https://www.f150online.com/forums/sh...ghlight=roller
On a roller 5.0 late model stang the switch from 1:6 to 1:7 is about .030 more valve lift. It also speeds up the valve , although not enough to have any real effect on duration. I would however recommend changing the stock valve srings, as they are weak to begin with.
They make roller followers
http://www.secondstreetspeed.com/
also see this thread, big coin for the gain.
https://www.f150online.com/forums/sh...ghlight=roller
On a roller 5.0 late model stang the switch from 1:6 to 1:7 is about .030 more valve lift. It also speeds up the valve , although not enough to have any real effect on duration. I would however recommend changing the stock valve srings, as they are weak to begin with.
Last edited by jstang; Dec 11, 2003 at 08:48 AM.