Speedway SBC Camshaft Break-In Roller Rocker Arms, 1.3:1, 3/8 Stud

#91511768

Speedway SBC Camshaft Break-In Roller Rocker Arms, 1.3:1, 3/8 Stud

Name: Speedway SBC Camshaft Break-In Roller Rocker Arms, 1.3:1, 3/8 Stud
Brand: Speedway Motors
SKU: 91511768
Price: 353.99 USD
Availability: InStock
Rating: 4.2 (12 reviews)

12 Reviews

6 Questions

One of the best kept secrets
Initial run times can kill a camshaft in the first minutes
Break-in rocker arms ease extreme valve spring pressures

Type:

3/8" Stud

7/16" Stud

$353.99

/set

In Stock

Quantity

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Product Summary

1.3:1 Rocker Arm Ratio, 0.38" Stud Diameter

One of the best kept secrets
Initial run times can kill a camshaft in the first minutes
Break-in rocker arms ease extreme valve spring pressures
These rockers use a 1.3 ratio to allow a run-in time for the camshaft
Engine is then race - street ready or ready for the dyno

See more details

Key Specs

MFG. Part #	91511768
Brand	Speedway Motors
Rocker Arm Ratio	1.3:1

See more specs

Need To Know

Need help?

855.313.9176

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Speedway Motors 91511768 Details

Probably one of the best kept secrets...the best engine builders use break-in roller rocker arms. With the extreme valve spring pressures racers use today, the initial run time can kill a camshaft in the first minute of running.

The big time engine builders use these 1.3:1 ratio rockers to allow a run-in time for the camshaft, then the 1.3:1 rockers are removed and the normal rockers are reinstalled and the engine is ready to race or dyno.

Polylocks are included.

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA Prop 65

CARB warning

Speedway Motors 91511768 Specifications

KEY SPECS
MFG. Part #	91511768
Brand	Speedway Motors
Rocker Arm Ratio	1.3:1

GENERAL
Stud Diameter	0.38"

Ratings & Reviews

4.2

12 Reviews

Overall Assessment

Customers appreciate the product's high quality, practicality, and key features. Its capability to clear Beehive springs stands out and its role as an easier alternative to using camshaft break-in springs is appreciated. Users highlight its affordability and suggest its good insurance compared to a damaged camshaft. The product saves time and diminishes frustration during the flat tappet cam break-in. Some users state adjustments may be needed for a correct fit. Overall, the product is considered a necessity for engine stabilizing during break-ins and it significantly aids in preventing cam damage.

Write A Review

4.2

12 reviews

Most Liked Positive Review

5.0

Worked great,saved time on cam break in

I bought these to break in cams without having to install weak valve springs. Installation was easy but these 1.3 full roller rockers will NOT fit under stock valve covers. No problem because Speedway sells tall chrome valve covers for $23. Worked just like they should and cam broke in without a flat lobe

Most Liked Negative Review

1.0

no mention of modifing rod guides to install rockers

bought these rockers instead of changing the valve springs for breaking -in the camshaft. the rockers gave the pushrods inter ference with the head guides,so now the rockers were useless to me. there were no notes on the ad stating that modifications were needed.

Filter by Ratings

Sort Reviews

Perfect fit

5.0

a year ago

Dncmotors

Washington

Verified

Don't break in a new cam without them!!

Would Recommend

Yes

5.0

a year ago

Iowa

Verified

I use them for camshaft break-in. Push rod holes are an issue but milled that area out before head assembly and no issues.

Would Recommend

Good product!

5.0

3 years ago

Jim

Des Moines, IA

Verified

With all of the issues breaking in cams I thought these were worth trying. I had no issues and would recommend these to anyone.

Easier than having to swap all my valve springs.

5.0

4 years ago

Grumpy

Saskatchewan, Canada

Verified

I ordered these as I didn't want the trouble of using camshaft break-in springs, and because I am using Beehive single springs, I can't remove an inner spring. These particular rocker arms did clear my Beehive springs. I did spend time ensuring valvetrain geometry and employing a correct length pushrod. (This isn't voodoo, just patience and attention to detail.) Despite that I may only ever use these a few times in my life, they are still cheap insurance compared to a wiped out camshaft.

Would Recommend

Good concept

1.0

5 years ago

Gdub63

Friendswood, Tx.

Verified

The rocker arm geometry positioned my pushrods right up against the pass through holes in the cylinder head. I'm running Trickflow heads that have a decent size pushrod hole. My pushrods are center of the hole with 1.5 ratio rocker arms, but I would have to remove my heads and enlongate the holes to make the 1.3 ratio rockers work. No Thanks.

Would Not Recommend

Look pretty good. Breaking in a new cam tonight.

5.0

5 years ago

Jason

Elmira NY

Verified

Will be nice to have these around for the next engine build.

Would Recommend

Very well made !!

5.0

7 years ago

Darkhorse

Webster city iowa

Verified

These save a lot of work breaking in a new cam!!

Would Recommend

No i wouldn't

3.0

8 years ago

Moe

Diana Tx.

Verified

Looks like a good built product , but won't work with my heads , tech support told me that they just don't work with all the heads .

Would Not Recommend

Works great

5.0

10 years ago

BigBro

Illinois

Verified

These work great for flat tappet cam break in- no need to remove center of dual valve springs. When the break in time is over all that needs done is to swap in your regular rockers. Save time and frustration ! You do of course still need to make sure to use correct break in oil.

Would Recommend

Worked great,saved time on cam break in

5.0

10 years ago

zman

Lincoln NE

Verified

Would Recommend

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Showing 10 of 12 reviews

Questions & Answers

6 Questions • 8 Answers

Sort Questions

Will this work on my blueprint engine h8002 heads

by Twb1976

• 7 years ago

1 answer

View Answer

will these work with 292 gm heads, also can i run theses instead of standard 1.5 to reduce lift to prolong valvetrain life

by tone

• 8 years ago

3 answers

View Answers

CAN THESE BE USED ON A OLDSMOBILE THAT HAS BEEN CONVERTED TO SCREW IN STUDS

by 455 ROCKET

• 10 years ago

1 answer

View Answer

Can this be used to break-in a hydraulic flat tappet cam? Do you deliver to Canada?

by Ermanno

• 10 years ago

1 answer

View Answer

do these come with a warranty of any kind

by shark773

• 11 years ago

1 answer

View Answer

are these self aligning?

by chevelle76

• 12 years ago

1 answer

View Answer

6 of 6 questions shown

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1984 Chevy C20

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1992-1995 Chevy C2500 Suburban

Gen 1 L05 Small Block Chevy

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1966 Chevy C30

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1984 Chevy C30

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1983-1987 Chevy C35

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1988-1995 Chevy C35

Gen 1 L05 Small Block Chevy

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Gen 1 L05 Small Block Chevy
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1988-1995 Chevy C3500

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1977-1982 Chevy K30

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1986 Chevy K30

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327 Chevy Small Block V8

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327 Chevy Small Block V8

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1998-1999 GMC C1500

Vortec L31 Small Block Chevy

1980-1986 GMC C1500 Suburban

2-Piece Rear Main Chevy 350

1992-1999 GMC C1500 Suburban

Vortec L31 Small Block Chevy

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Gen 1 L46 Small Block Chevy
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1967-1974 GMC C35/C3500 Pickup

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1978-1987 GMC Caballero

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327 Chevy Small Block V8

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2-Piece Rear Main Chevy 350

1967-1974 GMC G15/G1500 Van

2-Piece Rear Main Chevy 350

1964-1966 GMC G1500

327 Chevy Small Block V8

1979-1986 GMC G1500

2-Piece Rear Main Chevy 350

1987-1995 GMC G1500

Gen 1 L05 Small Block Chevy

1975-1978 GMC G25

2-Piece Rear Main Chevy 350

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2-Piece Rear Main Chevy 350

1979-1986 GMC G2500

2-Piece Rear Main Chevy 350

1987-1995 GMC G2500

Gen 1 L05 Small Block Chevy

1975-1978 GMC G35

2-Piece Rear Main Chevy 350

1967 GMC G35/G3500 Van

2-Piece Rear Main Chevy 350

1970-1974 GMC G35/G3500 Van

2-Piece Rear Main Chevy 350

1979-1986 GMC G3500

2-Piece Rear Main Chevy 350

1987-1994 GMC G3500

Gen 1 L05 Small Block Chevy

1995-1996 GMC G3500

Gen 1 L05 Small Block Chevy
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327 Chevy Small Block V8

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327 Chevy Small Block V8

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1966 GMC I3500

327 Chevy Small Block V8

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1983-1984 GMC Jimmy

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1986 GMC Jimmy

Gen 1 L05 Small Block Chevy

1987 GMC Jimmy

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1988-1990 GMC Jimmy

Gen 1 L05 Small Block Chevy

1966 GMC K1000

327 Chevy Small Block V8

1966 GMC K1000 Pickup

327 Chevy Small Block V8

1975-1978 GMC K15

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
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Gen 1 L82 Small Block Chevy

1975-1978 GMC K15 Suburban

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1966 GMC K15/K1500 Pickup

327 Chevy Small Block V8

1967-1974 GMC K15/K1500 Pickup

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1967-1974 GMC K15/K1500 Suburban

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1979-1984 GMC K1500

2-Piece Rear Main Chevy 350

1998-1999 GMC K1500

Vortec L31 Small Block Chevy

1979-1980 GMC K1500 Suburban

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1981-1986 GMC K1500 Suburban

Gen 1 L05 Small Block Chevy
Gen 1 L98 Small Block Chevy

1992-1999 GMC K1500 Suburban

Vortec L31 Small Block Chevy

1975-1978 GMC K25

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1975-1978 GMC K25 Suburban

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1967-1974 GMC K25/K2500 Pickup

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1967-1974 GMC K25/K2500 Suburban

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1979-1984 GMC K2500

2-Piece Rear Main Chevy 350

1986 GMC K2500

Gen 1 L05 Small Block Chevy

1996-2000 GMC K2500

Vortec L31 Small Block Chevy

1979-1986 GMC K2500 Suburban

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1992-1993 GMC K2500 Suburban

Gen 1 L05 Small Block Chevy

1994-1999 GMC K2500 Suburban

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1967-1974 GMC K35/K3500 Pickup

Gen 1 L46 Small Block Chevy
Gen 1 L48 Small Block Chevy
Gen 1 L65 Small Block Chevy
Gen 1 L81 Small Block Chevy
Gen 1 L82 Small Block Chevy

1987 GMC R1500 Suburban

Vortec L31 Small Block Chevy

1988-1991 GMC R1500 Suburban

Gen 1 L98 Small Block Chevy

1996-2000 GMC Savana 1500

Vortec L31 Small Block Chevy

1973-1977 GMC Sprint

Gen 1 LM1 Small Block Chevy

1955-1959 GMC Suburban

2-Piece Rear Main Chevy 265

1960-1966 GMC Suburban

Gen 1 L76 Small Block Chevy

1967 GMC Suburban

Gen 1 L46 Small Block Chevy
Gen 1 L76 Small Block Chevy

1955-1960 GMC Truck

2-Piece Rear Main Chevy 265

1987-1991 GMC V1500 Suburban

350 Chevy Small Block V8
Gen 1 L05 Small Block Chevy
Gen 1 L98 Small Block Chevy

1987 GMC V2500

350 Chevy Small Block V8
Gen 1 L05 Small Block Chevy
Gen 1 L98 Small Block Chevy

1987-1991 GMC V2500 Suburban

350 Chevy Small Block V8
Gen 1 L05 Small Block Chevy
Gen 1 L98 Small Block Chevy

1987-1991 GMC V3500

350 Chevy Small Block V8

1992-2011 GMC Yukon

Vortec L31 Small Block Chevy