Speedway Motors

#91015310

Flathead Cylinder Head Stud Kit

Name: Flathead Cylinder Head Stud Kit
Brand: Speedway Motors
SKU: 91015310
Rating: 4.5 (33 reviews)

33 Reviews

15 Questions

Studs have superior "pull down torque" and are a great upgrade from standard bolts
Flathead decks are thin and their threads are easily stripped making head studs a necessity
The combination of fine upper threads and hardened washers also prevents galling and ensures accurate torque readings

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$120.99

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Product Summary

Studs have superior "pull down torque" and are a great upgrade from standard bolts
Flathead decks are thin and their threads are easily stripped making head studs a necessity
The combination of fine upper threads and hardened washers also prevents galling and ensures accurate torque readings
This kit works well with both aluminum and iron heads
Never worry about blown head gaskets again!

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Key Specs

MFG. Part #	Select Year
Brand	Speedway Motors
Fastener Style	Stud
Thread Pitch	Block: 7/16"-14 UNC, Head: 7/16"-20 UNF

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Installation Details

Cylinder Head Bolts Installation Instructions (91015310)

Installation Tips

1939-1948 engines use 24 studs per head (48 per engine) that are 3.25" long.
1949-1953 engines use 10 short studs (3") and 14 long studs (3.25") per head (48 total studs per engine).
Use sealer on block threads – Moroso part number 545-35500
Use anti-seize on nuts and upper studs – Speedway part number 910-16011

1939-48 Kit includes (48) 3.25" studs, (48) grade 8 UNF nuts, and (48) hardened flat washers. Stud length for the long portion is 1-7/8", short portion is 11/16".

1949-53 Kit includes (28) 3.25" and (20) 3.00" studs, (48) grade 8 nuts, and (48) washers. 3" studs are long end 1.88"/short .69". The 3.25" studs are long end of 1.94"/short .69". Shoulder length is .66”

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Details

Performance engine builders know that head studs are superior to bolts, and this is especially the case on Flathead Ford and Mercury V8s. Flathead decks are thin and their threads are easily stripped. By installing studs, you avoid damaging the threads in the block through repeated use. The combination of the studs fine outer threads and hardened washers also prevents galling and ensures accurate torque readings, particularly on aluminum heads.

Studs utilize superior "pull down torque"
Properly fastens and torques both aluminum and iron heads

Item Details

1939-1948 or 1949-1953

Application

Part number 91015310-39 for 1939-1948 Flathead V8s
Part Number 91015310-49 for 1949-1953 Flathead V8s

Charts

910-15310 Instructions (PDF)

Guides & Documents

Cylinder Head Bolts Installation Instructions (91015310)

CA Prop 65

Specifications

KEY SPECS
MFG. Part #	Select Year to see
Brand	Speedway Motors
Fastener Style	Stud
Thread Pitch	Block: 7/16"-14 UNC, Head: 7/16"-20 UNF

GENERAL
Sold in Quantity	Set
Cut to Fit	Yes
Finish	Zinc
Material Type	Steel
Notes	39-48 set (48 each 3.25 inch studs) 49-53 set (28 each 3.25 inch , 20 3.00 inch studs)

Ratings & Reviews

4.5

33 Reviews

Overall Assessment

The product, a stud kit, enjoys a high satisfaction rate, with customers praising its usability, quality, and practicality. Successfully used in various engine types such as the 1940 59A Flathead and 1950 Ford V-8, it's favorably compared to bolts for the convenience it provides during installation. Customers who've shopped with us for over 25 years continue to find these stud kits high in quality and fitment, attesting to their durability and material quality. Some users even claim it to be essential for aftermarket cylinder head installation. Despite a couple of complaints about disappointments in stud length and finish, overall, the stud kit is touted as a cost-effective, ideal replacement for original bolts with superior performance and reliability.

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4.5

33 reviews

Most Liked Positive Review

5.0

excellent product

great product easy to fit and arrived in quick time. use 2 nuts to lock on stud and then wind them into the block secure, worth using stub lock to hold them tight

Most Liked Negative Review

1.0

VERY upset!!!

I WASTED several hours installing these studs, only to find out many of the studs are TOO SHORT!!! The product description says they will work with both Edelbrock and Offy alum heads...however they do NOT work with Edelbrock 1116 (74 cc) heads. I spent too much time and MONEY on this build to have these hassles! Now I will probably destroy a $120 headgasket (which has been painted already) removing it. I sure hope Speedway will replace them free of charge...seeing how I've spent almost $3000 with them if not more by now.

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I would purchase again

5.0

a year ago

MPLS

Verified

good upgrade to OE product

Yes

4.0

a year ago

Chris

Switzerland

Verified

Works well!

Would Recommend

Would buy again

5.0

a year ago

Gav

Melbourne, Australia

Verified

Not used yet but looks great, the kit weights quite a bit.

Would Recommend

Would buy again and have

5.0

2 years ago

Davey

Verified

Good price

Would Recommend

poorly machined threads

3.0

2 years ago

Wildmanbill

Amherst, OH

Verified

Tried 2 sets of these and both sets, 42 of the 48 studs were poorly machined to the point the nuts jambed almost instantly when trying to run the nuts on. Set them back and tried the Offenhouser stud kit, it was the same way, poor machining.

Would Not Recommend

Affordable

4.0

2 years ago

Lucky

Verified

Affordable head studs

Yes

5.0

3 years ago

67goingthing

Dix, IL

Verified

Nice set

Would Recommend

Perfect fit and looks so good.

5.0

4 years ago

JD's Hot Rods

Eagle Mountain UT

Verified

I used these on my 1940 59A Flat head and they are great.

Would Recommend

I buy from Speedway whenever possible.

5.0

4 years ago

Iceman

Odenville,AL

Verified

Have been buying from Speedway for over 25 years and never disappointed.

Would Recommend

I will buy again

5.0

4 years ago

Philip

ohio

Verified

Good part

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Showing 10 of 33 reviews

Questions & Answers

15 Questions • 10 Answers

Sort Questions

What is the country of origin ?

by Kurt

• 2 years ago

1 answer

View Answer

I installed this same stud kit in a 51 merc a few years ago that has edelbrock 1116 heads. I did have to shorten some of the studs but everything worked fine. I'm going to rebuild the engine and my question is : Are these reusable ? Thanks, HT

by HENRY

• 6 years ago

1 answer

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What stud kit should I buy to fit a 1947 Flat Head V8 with the factory heads? Mine has BOLTS that are 2" and 2 3/4"

by Tom

• 8 years ago

1 answer

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is the wench size 11/16 or 9/16. i want to use aluminum dome nut covers and need to know what size.

by stu

• 9 years ago

1 answer

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1115/1116 Edelbrock heads... will this stud kit work with those?

by Leon

• 9 years ago

1 answer

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Does Speedway have any recommendations on whether the studs should be oiled before the nuts are installed? Some say install them dry, some say oiled.

by bigwrenchfish

• 9 years ago

1 answer

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How tight should the studs be torqued before the heads are installed?

by bigwrench

• 9 years ago

1 answer

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will these work on a 1950 8BA?. Year selection only offers up to 1949. ???

by Scot

• 10 years ago

1 answer

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can these be used with stock 8CM heads?

by fl

• 10 years ago

1 answer

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8ba ford flathead v8 can these be used with the 21 stud heads

by michael1947

• 11 years ago

1 answer

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