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Technical Articles for Part Number HRS-190905-12
Howards Cams Hydraulic Roller Camshafts
Camshaft, Hydraulic Roller Tappet, Advertised Duration 287/290, Lift .612/.604, Chevy, Small Block LS, Each
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Estimated Ship Date: Oct 22, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
190905-12
Part Type:
Product Line:
Summit Racing Part Number:
HRS-190905-12
UPC:
840793108855
Cam Style:
Hydraulic roller, OE roller
Camshaft Use:
Drag race
Camshaft Manufacturers Description:
Large cu. in., race-only applications. Needs aftermarket intake, 2,500+ stall.
Basic Operating RPM Range:
2,400-7,400
Intake Duration at 050 inch Lift:
236
Exhaust Duration at 050 inch Lift:
238
Duration at 050 inch Lift:
236 int./238 exh.
Advertised Intake Duration:
287
Advertised Exhaust Duration:
290
Advertised Duration:
287 int./290 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.612 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.604 in.
Valve Lift with Factory Rocker Arm Ratio:
0.612 int./0.604 exh.
Lobe Separation (degrees):
112
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
Yes
Valve Springs Required:
Yes
Quantity:
Sold individually.
Notes:
For use with rectangular port cylinder heads. Large cu. in. engines with upgraded intake, springs, 2500 and up stall, and custom computer tuning required.
Howards Cams Hydraulic Roller Camshafts
Howards Cams hydraulic roller camshafts are offered in a wide variety of profiles, from mild to wild. These units are precision-ground from race-quality cores, in-house, on dedicated cam-grinding machines. Each Howards Cams hydraulic roller camshaft is manufactured to the highest quality standards. Order the model designed for your vehicle and engine application.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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