AFR and rocker arms....

[87'GTstang]

I know everyone awhile ago was ranting that the stock studs on the AFR heads were terrible, anyone know if they are still a major problem of if they have been fixed?
This may be a silly question but I have no idea as to the answer, the 165cc heads as well as the other major two heads for SBF come in 3/8" stud versions, how are they upgraded to a 7/16"?
Anyone know where one can find out a good way of calculating what kind of spring pressures to be running on a XE270 comp cams roller grind (or if the 120# on seat AFR springs will work at least)?

As to roller rockers, I have heard good things about Crane gold rockers, jesel, harland sharpe, and some average reviews on the comp cams pro magnums, crane energizers/frpp cobra rockers, and some iffy reviews on scorpions. Anyone have some long-term results with any of these and if so which ones hold true and are what the majority of you all seem to like?

 

[MustangPunk302]

I know everyone awhile ago was ranting that the stock studs on the AFR heads were terrible, anyone know if they are still a major problem of if they have been fixed?
This may be a silly question but I have no idea as to the answer, the 165cc heads as well as the other major two heads for SBF come in 3/8" stud versions, how are they upgraded to a 7/16"?
Anyone know where one can find out a good way of calculating what kind of spring pressures to be running on a XE270 comp cams roller grind (or if the 120# on seat AFR springs will work at least)?

As to roller rockers, I have heard good things about Crane gold rockers, jesel, harland sharpe, and some average reviews on the comp cams pro magnums, crane energizers/frpp cobra rockers, and some iffy reviews on scorpions. Anyone have some long-term results with any of these and if so which ones hold true and are what the majority of you all seem to like?

I haven't had problems with my stock studs on my 185's. They're upgraded by simply taking the 3/8" out and putting in a set of 7/16". I tried to look up the specs on comps website but it said to call 1-800-999-0853, so call em up and get there advice. The stock afr springs should work if it isn't a beast of a cam lol. I use Comp Cams Pro Mags and have no problems what's so ever, in fact there great, because I bent the **** outta one of there high energy smushrods, (accident: MSD wasn't hooked up, missed 3rd, 7,000 rpm later piston meets valve) anyway with no damage to roller tip/seat/or body of the rocker..

 

[Dark Knight]

The diameter is refering to the rocker arm part of the stud, not the base size.
Call Comp cams or e-mail them and they'll give you the spring pressures you need.

 

[Rick 91GT]

The swao is as easy as listed above, just unbolt the 3/8" studs and install the new 7/16", torque to spec with some sleaer on the threads and your golden.

As far as rockers go make sure you pick a rocker that will clear a large diameter spring, some are tighter then others. I have used the Probes, and Scorpions with out any issues...

If you plan to run a girdle keep the 3/8" stud. I would say you'll be fine with the 120# springs with that cam, but I find they loose a fair bit after running awhile so upgrading to a good spring with a little more pressure wouln't be a bad ideaand I am not a huge fan of the XE lobes...

 

[87'GTstang]

The diameter is refering to the rocker arm part of the stud, not the base size.
Call Comp cams or e-mail them and they'll give you the spring pressures you need.

So essentially in my mind i'm thinking the entire stud is 7/16" and the cylinder heads need to be tapped and threaded for this. If that isn't the case and just the portion which the rocker arms bolt to is 7/16", then does it make that great of an improvement? Or is sticking to the stock AFR rocker studs and just adding a girdle a wiser choice?

 

[87'GTstang]

I am not a huge fan of the XE lobes...

Any particular reasons? I had the 35-351-8 (114 lSA) cam highly reccomended to me for a future blower......

 

[Dark Knight]

So essentially in my mind i'm thinking the entire stud is 7/16" and the cylinder heads need to be tapped and threaded for this. If that isn't the case and just the portion which the rocker arms bolt to is 7/16", then does it make that great of an improvement? Or is sticking to the stock AFR rocker studs and just adding a girdle a wiser choice?

The 7/16th part is the part that the rocker arms is on, the threaded section in the head is the same size. The lower part in the head will be the same size, there isnt as much load as on the upper part of the stud. A 7/16 upper part will have less deflection than a 3/8..