Speedway Screw-In Rocker Arm Studs, 3/8 Inch
Speedway Screw-In Rocker Arm Studs, 3/8 Inch
Speedway Motors

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#577RM348

Speedway Screw-In Rocker Arm Studs, 3/8 Inch

  • 3/8" Chromoly steel, black oxide finish
  • Thread length .85" (bottom) .80" (top)
  • For use without guide plates
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$20.99

/set

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Product Summary

2.32" Overall Length, Chromoly, 3/8"-24 Thread Pitch

  • 3/8" Chromoly steel, black oxide finish
  • Thread length .85" (bottom) .80" (top)
  • For use without guide plates
  • Simply tap boss 7/16"-14 and screw in the studs
  • Complete set of 16 studs
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Key Specs

MFG. Part #577RM348
BrandSpeedway Motors
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Speedway Motors 577RM348 Details

3/8" Chromoly steel. For use without guide plates. Simply tap boss 7/16"-14 and screw in the studs.

Complete set of 16 studs.

Speedway Motors 577RM348 Specifications

KEY SPECS
MFG. Part #577RM348
BrandSpeedway Motors
GENERAL
Overall Length2.32"
Material TypeChromoly
Thread Pitch3/8"-24
Thread Pitch (2)7/16"-14
FinishBlack Oxide
Sold in QuantitySet
NotesThread Length: .85" (bottom), .80" (to)
ColorBlack

Ratings & Reviews

4.9

52 Reviews

Overall Assessment

Customers widely appreciate this product for its top-tier quality, great craftsmanship, and perfect fit, frequently recommending it over competitors. Users have highlighted its easy installation, usability, safety, and the practical feature of screw-in studs that effectively do the job. The product has also been commended for being an excellent source of basic items for modification. Superior features such as being a good quick upgrade for press-in studs, and affordable, time-saving replacements for existing parts have been praised. This product has been recognized has a trusted solution for an aged or gnarly press-in stud, providing a low-cost fix. Users also deem it a well-made, reliable part with a great price-quality ratio. Customers have shown intentions to repurchase and recommend this product based on its performance.

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4.9

52 reviews

5

46

4

5

3

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2

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Most Liked Positive Review

5.0

Saved me a ton of time

I had ordered a set of rebuilt heads and after waiting for over two weeks for them to show up, received one with a bent rocker arm stud. Not being a big fan of the stock press in studs, decided to order these to repair the bent one but also replace the remaining stock ones as well. Received them in just a couple of days, and drilled/ tapped and installed these all on my kitchen table. Got the heads installed the next day and everything back together.

Most Liked Negative Review

3.0

Just what I needed

Fast shipping great price and service. Just shipping cost was more than my parts.

Filter by Ratings

I would buy again

5.0

a year ago

Fast Frank

Phoenix AZ

Verified

Broke a stud on a 350hp 327. Replaced with these. Couple of thousand miles and working fine.

Would Recommend

Yep

5.0

2 years ago

Axle

Bath Springs Tn

Verified

Good part

Would Recommend

I would recommend these to anyone.

5.0

3 years ago

Luke

Aztec nm

Verified

They are great and description was excellent

Would Recommend

The right part shipped fast

5.0

3 years ago

ace

Kingman,AZ

Verified

Great Fast ship right part

Would Recommend

I would buy this product again

5.0

4 years ago

Billbill

Stockton ks

Verified

Screw in studs do the job

Would Recommend

Cylinder Head Modifying

4.0

4 years ago

Mark

Maine

Verified

I don't just build like everyone,I modify to my needs. Great source for basic items.

Would Recommend

Item received faster than expected!

5.0

4 years ago

Ted

Moss Bluff, LA

Verified

awesome craftmanship

Would Recommend

Works great for the unique need

5.0

4 years ago

Fun Car

Carver, MN

Verified

I am using these to use existing 3/8" holes that I tapped for the 7/16" - 14 end and the 3/8" - 24 stud will fit the differential carrier properly.

Would Recommend

yes

5.0

4 years ago

ron

live oak fl.

Verified

all good

Would Recommend

Awesome product!!

5.0

5 years ago

Edmotive

Los Angeles

Verified

Used em on my vortec heads, fit in sweet after tap'n

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Showing 10 of 52 reviews

Questions & Answers

5 Questions • 8 Answers

If these need to be removed how do you do that?

by gompeh

• 7 years ago

2 answers

View Answers

Will I have to do any modifications to the head or add longer pushrods with these studs? I am using it to replace a pulled stud. I tapped the boss and bought a hex head stud. It doesn't allow rocker to tighten down on the valve or pushrod. Will these thread on and work without having to change anything?

by Sbrum25

• 9 years ago

2 answers

View Answers

I am considering using these rocker studs but I can't find accurate torque specs anywhere. I have seen specs ranging from 12-50ft/lbs and have also heard of people cracking the stud bosses with this style of rocker stud (likely from over-tightening). What is the correct torque spec for installing these rocker studs? Are these studs ok for a mild performance application? I am running Chev Vortec heads and a cam with approx. 270* advertised duration and 0.520 inch lift.

by Jeff

• 10 years ago

1 answer

View Answer

Do these require polylocks or can I use the standard crimp nut and will they work without any machine work to the head other than tapping the hole?

by Grampa

• 13 years ago

2 answers

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will this product work on a 289 ford engine (1967)& do you sell the drill bit & tap to make it fit.

by robert

• 14 years ago

1 answer

View Answer

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