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12363230 - HT 3.4L Crate Engine - DISCONTINUED

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

Availability: Item has been discontinued and is no longer available
Shipping: FREE 48 State Shipping


Tired of that tired 2.8 V-6 in your S-truck? It's time for a major upgrade, GM Performance Parts style. The HT 3.4 is a bolt in replacement for the 2.8 V6 in your 1982 - 1985 pickup or Blazer. And it's emission legal in 49 states (Yes, you guessed it, California said no.) But for the rest of us, the HT 3.4 is the best thing going.

With 160 horsepower and 194 Ft. Lbs. of torque your truck will feel better than new, and tow better than ever. The heads have large 1.72" intake and 1.42" exhaust valves and combustion chambers that yield a healthy 9 to 1 compression ratio. The camshaft is a high lift, short duration design, developed to produce lots of strong low end torque and mid range horsepower.

With .427" intake and .454" exhaust lift, the cam ensures a strong pull to 5000 RPM. Doesn't sound like your 2.8 V6 at all, does it? It isn't, when GM Performance Parts develops an engine we focus on making power. But not power for the sake of power, but power where you need it. For great drivability, towing performance and maybe a little off road fun.

The bigger 3.4L V-6 is virtually a bolt in for the above applications, utilizing the existing intake manifold, ignition system, emission system, and water pump from the original 2.8L engine. Some models may also require using the oil pan or front cover from the original engine. The 1982 - 83 models with manual transmission use a clutch cross shaft with a ball stud on the block. This new 3.4L does not have that clutch boss cast on the block.

The 3.4L engine conversion package offers a considerable improvement in horsepower and torque over the 2.8L engine in an economical bolt in package. This engine package includes the engine assembly, comprehensive installation instructions and decals. Technical Note: The HT 3.4 requires an electric fuel pump.


Horespower-160 @ 5000 RPM
Torque- 194 @2700 RPM

Compression Ratio- 9.0:1

Internal Components:
Block- Cast Iron 3.4L Block , Rear Wheel Drive Applications Only 3.62" Bore Size
Crankshaft- Part # 10146889 Nodular Iron, 3.31" Stroke
Connecting Rods- Part # 10192567
Pistons- Part # 10146858 Cast
Camshaft-Part # 12363230 Flat Tappet Hydraulic Camshaft.
Intake Lift- .427" Intake Duration @ .050" 204
Exhaust lift- .454" Exhaust Duration @ .050" 216
Lobe Centerline-107
Rocker Arms- part # 14002446 Stamped Steel
Cylinder heads-Part # 14054884 Cast iron , 60 V6 performance Head , Originally used on the Citation X11 2.8 H.O. Engine 1.72" Intake, 1.42" Exhaust

Application List



  • 12363230
  • 12363230
  • Chevrolet Performance Parts
  • Item has been discontinued and is no longer available
  • New


Shipping Information

  • Item Requires Shipping
  • 349.0 lbs.
  • W23.0000” x H33.5000” x L29.5000”
  • FREE 48 State Shipping

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