drilling for rocker studs

NecroWolf

NecroWolf

lost marbles member
i'm just verifying that i got the right idea in my head. i'm getting ready to put arp rocker studs in my vortec heads. all i need to do is center over the already drilled hole and enlarge it to the appropriate size and tap it for the right thread correct?
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: drilling for rocker studs

MikeRenz said:
or you can just buy arp metric conversion bolts and not drill anything
Click to expand...

Unless ARP (or someone else) has started making a new set, the ARP metric conversion studs are the wrong length.
 
S

Syclone #1721

I LOVE 4UM SUPERSTARS
Re: drilling for rocker studs

I strongly suggest not drilling them by hand. I mean yea you can do it and I know some people will say they did it without a problem but if they are off a little bit, it will affect your rocker arm geometry and cause irregular wear of the rocker stud especially if you are using aftermarket rockers. Take it to a machine shop and have it done. Its not that expensive and will make a big difference. While they are there, have the guides cut for positive seals.
 
M

MikeRenz

not stock
Re: drilling for rocker studs

dgoodhue said:
Unless ARP (or someone else) has started making a new set, the ARP metric conversion studs are the wrong length.
Click to expand...
they worked for me :dunno:

ARPRockerStuds.JPG
 
NecroWolf

NecroWolf

lost marbles member
Re: drilling for rocker studs

Syclone #1721 said:
I strongly suggest not drilling them by hand. I mean yea you can do it and I know some people will say they did it without a problem but if they are off a little bit, it will affect your rocker arm geometry and cause irregular wear of the rocker stud especially if you are using aftermarket rockers. Take it to a machine shop and have it done. Its not that expensive and will make a big difference. While they are there, have the guides cut for positive seals.
Click to expand...


i will probably fire up my trusty drill press for it, but i'm looking for a shop to cut for over sized valves so i might let them do it i i can find a decent price on it.
 
jslezak83

jslezak83

Soon-to-be BoostedBlazer
Re: drilling for rocker studs

i just did my L31 Vortecs. i didn't drill anything. the holes were just a tad bigger than the "O" bid you need for 7/16"-14. the studs i baught where 7/16", with 3/8" shank for the rockers.
 
NecroWolf

NecroWolf

lost marbles member
Re: drilling for rocker studs

jslezak83 said:
i just did my L31 Vortecs. i didn't drill anything. the holes were just a tad bigger than the "O" bid you need for 7/16"-14. the studs i baught where 7/16", with 3/8" shank for the rockers.
Click to expand...


you probably have the older heads. they used a 10mm bolt, the newer ones use an 8mm bolt
 
S

syclone0209

Member
Re: drilling for rocker studs

MikeRenz said:
I used 100-7201
Ed Hess used 135-7201

I have no clue what the difference may be.
Click to expand...

135-7201 arp big block chevy 496 ci. longer stud length for rocker arm nut or poly lock.
 
ghettosled

ghettosled

SYTY SUPERSTORE
Re: drilling for rocker studs

dgoodhue said:
Unless ARP (or someone else) has started making a new set, the ARP metric conversion studs are the wrong length.
Click to expand...

wrong length for full bodied rockers, but work fine for cup style or roller tip. You can make them work with full roller rockers if you machine down the rocker nuts so they grap 3-4 threads, but it would be better to re-drill the heads for 7/16" studs.
 
ghettosled

ghettosled

SYTY SUPERSTORE
Re: drilling for rocker studs

134-7201

chevy late model vortec (8mm). They are actually .155 taller then the 10mm ones which will help when using full roller or aluminum bodied rockers.
 
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