How do I find out if I need 3/8 or 7/16 Rocker Studs?

[caseywan]

I bought my heads used and they didn't come with rockers, and am trying to figure out which I need, 3/8 or 7/16. They are TFS Twisted Wedge heads, and the following are the only numbers I see on the heads but I can't match them up with anything on TFS's website.

TFS-SBF-1
Pat. No. 587664
63919-2
4058

If anyone could help me out that would be great.

Thanks, Dan

 

[getusummm]

do they have rocker studs in them already? if so, then just measure the threaded part. it will be 3/8 or 7/16. if it doesnt have studs, then get some that match whatever rockers you buy. the bases are all 7/16, only the top changes.

 

[85_SS_302_Coupe]

do they have rocker studs in them already? if so, then just measure the threaded part. it will be 3/8 or 7/16. if it doesnt have studs, then get some that match whatever rockers you buy. the bases are all 7/16, only the top changes.

If you have the option (like if you haven't bought studs or rockers) you might wanna opt for 7/16, but that doesn't mean the 3/8 are bad or anything.

 

[getusummm]

I agree with getting the 7/16 if you dont already have any. They will hold up better underload with less flex than the 3/8. I dont think you will see much difference in prices.

 

[caseywan]

Oh ok, I was under the impression that the threaded whole in the head made the difference as to wheter you needed 3/8 or 7/16.

So I take it studs usually don't come with the rockers?