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Howards Cams 121153-10 Steel Billet Mechanical Roller Camshaft Big Block Chevy

Manufacturer

Picture for manufacturer Howards Cams

Part Number

121153-10
6 reviews
Sale Price

$456.79

3 left at this price

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Usually delivered within 2 days

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Product Details

The Howards Cams 121153-10 is a high-performance steel billet mechanical roller camshaft designed for serious street/strip applications. Manufactured from billet steel and ground on precision equipment, this race-quality camshaft delivers aggressive performance for Big Block Chevy Mark IV engines.

Key Specifications:

  • Valve Lift: 0.663 inch intake / 0.680 inch exhaust
  • Duration at 0.050 inch: 249 degrees intake / 255 degrees exhaust
  • Advertised Duration: 281 degrees intake / 287 degrees exhaust
  • Lobe Separation Angle: 110 degrees
  • Centerline: 106 degrees
  • Valve Lash: 0.022 inch intake and exhaust
  • Operating RPM Range: 3000 to 7000 RPM

Performance Characteristics:

  • Delivers good mid-range horsepower with a rough idle
  • Requires 11.0:1 or higher compression ratio
  • Requires upgraded valve springs (not included)
  • Solid roller, retro-fit design

This camshaft is ideal for performance enthusiasts looking to maximize power output on Big Block Chevy 396-502 cubic inch Mark IV engines. Mechanical roller cams offer aggressive power for all-out competition. The solid roller design provides exceptional durability and performance consistency at high RPM ranges. Sold individually and requires matching roller lifters for proper operation.

Products specifications

Advertised Duration

285 int./290 exh.

Basic Operating RPM Range

2,500-6,700

Cam Style

Mechanical roller tappet

Camshaft Manufacturers Description

Good midrange horsepower, rough idle. Needs 11.0:1 compression ratio and up.

Duration at 050 inch Lift

248 int./255 exh.

Exhaust Duration at 050 inch Lift

255

Exhaust Valve Lash

0.020 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio

0.675 in.

Intake Duration at 050 inch Lift

248

Intake Valve Lash

0.020 in.

Intake Valve Lift with Factory Rocker Arm Ratio

0.660 in.

Lobe Separation (degrees)

110

Quantity

Sold individually.

Valve Lift with Factory Rocker Arm Ratio

0.660 int./0.675 exh. lift

Fast, cheap and easy! Couldn't ask for more

Love the fast shipping option! I've been looking for this part for quite some time. Thank you Autoplicity!

Extremely easy to find the correct product and with Paypal, easy to complete the transaction

Item just as descibed, great price and fast shipping. This has been my first order and actually first time searching for an auto part on this site and all went as expected. Glad I saw reference to it a car forum.

Quick shipping and a part that worked.<br><br>order 104-9436863-0564219

I am extremely satisfied with Autoplicity in terms of service, price, and shipping. I was shopping for a set of N-FAB step bars for my truck and was ready to purchase from Amazon when I decided to look around to see if there were better prices. I stumbled upon Autoplicity and was surprised to see their price on the bars. I checked with their online chat customer service to confirm that they would fit my truck and that the price was for a pair of the bars and not just one. (That's how low the price was!). I then placed my order and the bars arrived at my doorstep 3 days later! Autoplicity gets an A+ in my book and I'll definitely be coming back.

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