Offset vs. Centerline solid roller lifters?
#3
Re: Offset vs. Centerline solid roller lifters?
Some of the larger more exotic race heads have different valve spacing and require offset lifters to correctly orient valve train geometry. For example, my SB2 heads are going to use a .150" offset lifter to make the pushrod angle right. 90% of the stuff you'll see for a sbc will be standard and almost everything you need for an LT1 will be standard.
#4
Re: Offset vs. Centerline solid roller lifters?
What about the AFR 227. I am going to run a jesel shaft mount rocker which is made for the 60/40 valve spacing. Would this require an offset lifter?
#5
Re: Offset vs. Centerline solid roller lifters?
I don't know if the 227's are on a different spacing than my AFR 220's, but the 220's are borderline. I'm using std centered lifters and rockers, but could have went with offset and had slightly better geometry.
#6
Re: Offset vs. Centerline solid roller lifters?
AFR only requires offset liftes on their 215RRs (.180" offset). Offset stud girdles are recommended for the 220 & 227 heads though (i.e. not required).
#7
Re: Offset vs. Centerline solid roller lifters?
Originally Posted by Black95Form
What about the AFR 227. I am going to run a jesel shaft mount rocker which is made for the 60/40 valve spacing. Would this require an offset lifter?
#9
Re: Offset vs. Centerline solid roller lifters?
i seen a set of offset solid roller lifters for sale on e bay, can they be used with no other supporting parts, will the slight angle hurt anything at high rpm or any rpm
#10
Re: Offset vs. Centerline solid roller lifters?
I would strongly recommend not buying offset lifters and just trying to make them work. Proper valvetrain geometry is crucial to making everything stay together. Offset lifters should only be used if you have to.
#11
Re: Offset vs. Centerline solid roller lifters?
Originally Posted by Black95Form
When is it recommended to use an offset lifter instead of a centerline lifter?
It is better to get the correct shaft rockers than offset lifters. Sometimes they are required to take the angle out of the push rod.
A little angle won't hurt,look at a BB Ford or Chevy.
If you are planning to shift at 9,500 then the straighter the better.
No,the AFR 227 don't need offset anything. The rockers will set at an angle to the head like a TFS head on a Ford.
#12
Re: Offset vs. Centerline solid roller lifters?
1RacerDude,
If offset rockers are not required on a AFR227, why is it it requires an offset stud girdle? Maybe I just dont understand.
Michael
If offset rockers are not required on a AFR227, why is it it requires an offset stud girdle? Maybe I just dont understand.
Michael
#13
Re: Offset vs. Centerline solid roller lifters?
Go to AFR's sight and see. The valve spacing is different than a 210,ect,the rockers sit at an angle to the head like a TFS on a Ford.
The studs are in a different place than the valves,hence the angle of the rockers.
The studs are not directly behind the valve and a standard girdle would not let you install the valve covers.One end on each head would be sticking out over the gasket boss.
The studs are in a different place than the valves,hence the angle of the rockers.
The studs are not directly behind the valve and a standard girdle would not let you install the valve covers.One end on each head would be sticking out over the gasket boss.
Last edited by 1racerdude; 02-14-2005 at 10:59 PM.
#14
Re: Offset vs. Centerline solid roller lifters?
AFR 215cc RR heads. Note the position of the intake valves in relation to the intake ports.
http://home.gci.net/~jimlab/images/H...d/P1020025.jpg
http://home.gci.net/~jimlab/images/H...d/P1020031.jpg
Offset lifters (0.180" intake) and rockers (0.450" intake, 0.100" exhaust).
http://home.gci.net/~jimlab/images/Misc/P6200017.jpg
http://home.gci.net/~jimlab/images/E...d/P1190101.jpg
According to the Crower catalog, the AFR 220s and 227s use the same rocker offset and the 180s and 210s have a 0.250" intake offset.
http://home.gci.net/~jimlab/images/H...d/P1020025.jpg
http://home.gci.net/~jimlab/images/H...d/P1020031.jpg
Offset lifters (0.180" intake) and rockers (0.450" intake, 0.100" exhaust).
http://home.gci.net/~jimlab/images/Misc/P6200017.jpg
http://home.gci.net/~jimlab/images/E...d/P1190101.jpg
According to the Crower catalog, the AFR 220s and 227s use the same rocker offset and the 180s and 210s have a 0.250" intake offset.
#15
Re: Offset vs. Centerline solid roller lifters?
The AFR227s have offset valve locations and to get the most correct geometry is why you use the offset lifters too! You guys are getting confused and you're also believing the AFR catalogue is right! The 227 and 215RR have the same stands in REALITY but not in the catalogues.