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Technical Articles for Part Number HRS-129275-16
Howards Cams Boost Retrofit Hydraulic Roller Camshafts 129275-16
Part Number: HRS-129275-16
Howards Cams Boost Retrofit Hydraulic Roller Camshafts
Camshaft, Boost, Hydraulic Roller Tappet, Advertised Duration 287/285, Lift .617/.612, Chevrolet, Big Block, Each
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Estimated Ship Date from Texas: Today Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
129275-16
Part Type:
Product Line:
Summit Racing Part Number:
HRS-129275-16
Cam Style:
Hydraulic roller, Retro-fit
Camshaft Use:
Street/Strip
Camshaft Manufacturers Description:
Centerline: 112, Turbo, Fair idle. Pro Street or Street/Strip. Needs 9.5:1 compression, 2800+ stall.
Basic Operating RPM Range:
2,400-6,200
Intake Duration at 050 inch Lift:
235
Exhaust Duration at 050 inch Lift:
233
Duration at 050 inch Lift:
235 int./233 exh.
Advertised Intake Duration:
287
Advertised Exhaust Duration:
285
Advertised Duration:
287 int./285 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.617 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.612 in.
Valve Lift with Factory Rocker Arm Ratio:
0.617 int./0.612 exh.
Lobe Separation (degrees):
116
Camshaft Gear Attachment:
3-bolt
Remanufactured:
No
Computer-Controlled Compatible:
No
Valve Springs Required:
Yes
Quantity:
Sold individually.
Notes:
Requires thrust button.
Howards Cams Boost Retrofit Hydraulic Roller Camshafts
Howards Cams Boost retrofit hydraulic roller camshafts are ideal for replacing your flat-tappet camshaft. They're available with various lifts and durations, and can provide different idles including good, fair, rough, and lopey. They're ideal for competition and high performance builds featuring forced induction, but not intended for use with stock (OE) valve springs (thrust button may be required). Firing order, degrees of lobe separation, and intake centerline designs vary by application. Add over 70 years of race winning performance to your naturally aspirated build with the Howards Cams Boost retrofit hydraulic roller camshaft designed for your engine.
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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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