Truck / SUV
Jeep®
Restoration
Stock Replacement
Late Model Muscle
Tools
Gifts, Clothing, & More
Circle Track
Street Rod
Powersports
Paint & Body
Marine
Jr Dragster
Technical Articles for Part Number HRS-512121-12
Howards Cams Street Force 3 Hydraulic Flat Tappet Camshafts 512121-12
Part Number: HRS-512121-12
Howards Cams Street Force 3 Hydraulic Flat Tappet Camshafts
Camshaft, Hydraulic Flat Tappet, Advertised Duration 279/289, Lift .496/.501, Oldsmobile, V8, Each
See More Specifications
|
Check the Fit
Estimated Ship Date: Dec 23, 2026 Would you rather pick it up?
Need It Sooner? We recommend these similar substitute parts:
Overview
Brand:
Manufacturer's Part Number:
512121-12
Part Type:
Product Line:
Summit Racing Part Number:
HRS-512121-12
UPC:
840793134564
Cam Style:
Hydraulic flat tappet
Camshaft Use:
Street/Strip
Camshaft Manufacturers Description:
This camshaft has a noticeable idle. Street Force 3 needs a street 2,200-2,500 stall converter and 3.20 to 3.90 gear ratio. Good ignition system will give you additional performance.
Basic Operating RPM Range:
1,800-6,000
Intake Duration at 050 inch Lift:
225
Exhaust Duration at 050 inch Lift:
235
Duration at 050 inch Lift:
225 int./235 exh.
Advertised Intake Duration:
279
Advertised Exhaust Duration:
289
Advertised Duration:
279 int./289 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.496 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.501 in.
Valve Lift with Factory Rocker Arm Ratio:
0.496 int./0.501 exh.
Lobe Separation (degrees):
112
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Quantity:
Sold individually.
Howards Cams Street Force 3 Hydraulic Flat Tappet Camshafts
Howards Cams Street Force 3 hydraulic flat tappet camshafts are engineered for the street performance enthusiast, but also work well for mild bracket racing. The specially designed grinds were created to provide a noticeable idle and strong throttle response. This series of camshafts require the use of an improved intake manifold, 4-barrel carburetor, free-flow exhaust, and 2,200 to 2,500 stall rpm torque converter. Upgrading your ignition system and a utilizing a 3.20 to 3.90 gear ratio will provide additional performance. Street Force 3 camshafts also feature 112 degree lobe separations to help maintain vacuum. They're available for a variety of year/make and engine applications. When it comes to street performance, Howards Cams is the preferred choice.
Applications
Loading...
Loading...
Questions & Answers
Ask a Question
What type of question would you like to submit?
I have a Customer Service question
(order, shipping, returns, protection plans, etc.). Customer Service Question
(order, shipping, returns, protection plans, etc.). Customer Service Question
- OR -
I would like to ask other customers
a question about this Product. Product Related Question
a question about this Product. Product Related Question
Loading...
Reviews Write a Review
Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
Modal Header
Call To Order
This is a custom order part. You can order this part by Contacting Us.
Email this page
