anyone know the rocker arm ratio for a 93 5.0L H.O.

SinisterX · 02-14-2006, 03:47 PM

I think is 1.6 but I need to know for sure.

Thanks.

cobra1923 · 02-16-2006, 02:16 PM

yes, it is 1.6

6689stang · 02-16-2006, 06:37 PM

1.6 is the stock ratio, and don't get sucked in by those who use 1.7's. The fact is 1.7s on a sm block really don't give you any extra horse power or tourqe (5 if your lucky) and they where down your valve guides faster due the increased stress. You should only get extra lift from your cam. (My info can be backed up by the August 04 isssue of 5.0 mag)

cobra1923 · 02-17-2006, 04:47 AM

agreed, it throws off the valve train geometry

SinisterX · 02-17-2006, 11:30 AM

Do you know if that article is available online? I'm not disagreeing with you or the article, just trying to understand, but I can't see where a larger ratio would cause increased wear on the valve guide or stem since the geo change is at the rocker arm end. The distance from center line of the stud/bolt to the center line of the valve stays the same.

cobra1923 · 02-17-2006, 11:50 AM

I read about it years ago in one of the rags, but I think it placed the rocker arm contact slightly off center and at an angle to the valve stem - that put slight lateral pressure on the valve and ultimately the guides. The article was pretty techy but it sounded convincing. Honestly I ran 1.7's in all but one of my 5.0s and never had any problems (30K miles at the most).. Once I read the article I stopped using them and just used the cam to get the lift I wanted. It was never because I actually dropped a valve guide.

02-14-2006, 03:47 PM	#1 (permalink)
SinisterX Junior Member Join Date: Jan 2006 Location: Mid-Michigan Posts: 7	anyone know the rocker arm ratio for a 93 5.0L H.O. I think is 1.6 but I need to know for sure. Thanks. __________________ 04 GT Orange w/black strips 68 Cougar In process Restomod Someday soon - 5.0L EFI with Super Charger Watch my progess on My Cougar Site

02-16-2006, 02:16 PM	#2 (permalink)
cobra1923 Senior Member Join Date: Nov 2004 Location: Baltimore Posts: 575	yes, it is 1.6 __________________ 2003 10th Anniversary Cobra Convertible All Stock and staying that way... well maybe some pipes since it's so quiet..ahhhh! it's a sickness 1995 mustang GT vert - all black (almost back together)

02-16-2006, 06:37 PM	#3 (permalink)
6689stang Junior Member Join Date: Feb 2006 Posts: 5	don't do 1.7s either 1.6 is the stock ratio, and don't get sucked in by those who use 1.7's. The fact is 1.7s on a sm block really don't give you any extra horse power or tourqe (5 if your lucky) and they where down your valve guides faster due the increased stress. You should only get extra lift from your cam. (My info can be backed up by the August 04 isssue of 5.0 mag)

02-17-2006, 04:47 AM	#4 (permalink)
cobra1923 Senior Member Join Date: Nov 2004 Location: Baltimore Posts: 575	agreed, it throws off the valve train geometry __________________ 2003 10th Anniversary Cobra Convertible All Stock and staying that way... well maybe some pipes since it's so quiet..ahhhh! it's a sickness 1995 mustang GT vert - all black (almost back together)

02-17-2006, 11:30 AM	#5 (permalink)
SinisterX Junior Member Join Date: Jan 2006 Location: Mid-Michigan Posts: 7	Do you know if that article is available online? I'm not disagreeing with you or the article, just trying to understand, but I can't see where a larger ratio would cause increased wear on the valve guide or stem since the geo change is at the rocker arm end. The distance from center line of the stud/bolt to the center line of the valve stays the same. __________________ 04 GT Orange w/black strips 68 Cougar In process Restomod Someday soon - 5.0L EFI with Super Charger Watch my progess on My Cougar Site

02-17-2006, 11:50 AM	#6 (permalink)
cobra1923 Senior Member Join Date: Nov 2004 Location: Baltimore Posts: 575	I read about it years ago in one of the rags, but I think it placed the rocker arm contact slightly off center and at an angle to the valve stem - that put slight lateral pressure on the valve and ultimately the guides. The article was pretty techy but it sounded convincing. Honestly I ran 1.7's in all but one of my 5.0s and never had any problems (30K miles at the most).. Once I read the article I stopped using them and just used the cam to get the lift I wanted. It was never because I actually dropped a valve guide. __________________ 2003 10th Anniversary Cobra Convertible All Stock and staying that way... well maybe some pipes since it's so quiet..ahhhh! it's a sickness 1995 mustang GT vert - all black (almost back together)

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