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Tune-Up Specifications for Vehicles

by Contributing WriterUpdated June 12, 2017

Although the Vehicles was installed in the first year of the Firebird, the engine is most commonly associated with the Tempest. The Vehicles is a durable engine, but regular maintenance is important. Tuning up the engine will help ensure that it runs Vehicles its most efficient, but Vehicles tuneup specifications should carefully be followed.

Under The Hood:

 Tune-Up Specifications for the 1964 Ford Falcon


The 1965 Ford Falcon was available in three engine choices. The Squire Six and Squire Cruise-o-matic models came equipped with a 2.8-liter, inline-six-cylinder engine with 105 horsepower at 4,400 rpm. This engine has a bore of 88.9 mm and a stroke of 74.68 mm, with a compression of 9.1:1. The second engine choice is a 3.3-liter, inline-six-cylinder engine with 120 horsepower at 4,400 rpm. This engine has a bore of 93.47 mm and a stroke of 79.5 mm, with a compression of 9.2:1. This engine came with the Fairlane six and the Fairlane Cruise-o-matic models. The largest engine is the 4.7-liter V-8 engine with 200 horsepower at 4,400 rpm. This engine has a bore of 101.6 mm and a stroke of 72.89 mm, with a compression ratio of 9.3:1 and was available in the Challenger models only.

Tune-Up Specs

The tune-up specifications for the six-cylinder engines is as follows: the spark plug gap is 0.34 inch and the type is BF82, the distributor point dwell is 37.5 degrees and the distributor point gap is 0.25 inch. The engine timing is 12 degrees before top dead center. The idle speed is 485 rpm. This engine has hydraulic valves and the intake valve opens at 13 degrees before top dead center. The fuel pump pressure is 4.5 psi. The V-8 engine has a spark plug gap of 0.34 inch and the type is BF42, the distributor point dwell is 27 degrees and the distributor point gap is .015 inch. The ignition timing for the manual transmission model is six degrees before top dead center. The ignition timing for the automatic transmission model is 8 degrees before top dead center. The engine has hydraulic valves and the intake valves open at 20 degrees before top dead center. The idle speed is 575 rpm for the manual transmission model and 500 rpm for the automatic transmission model. The fuel pump pressure is 5 psi.

Fuel Economy

The six-cylinder engines have a fuel rating of 21.2 mpg in urban areas, 11.2 mpg in the city and a highway rating of 16.7 mpg. The eight-cylinder engine has a fuel rating of 15.4 mpg in urban locations, 8.9 mpg in the city and 12.9 mpg on the highway.

 Tuneup Specifications for a 1950 Ford 226 C.I. Flathead

Spark Plug Gap

The 226 was equipped with Champion-type H10 spark plugs. The spark plug gap for all six plugs was .030 inch. The 226's firing order was 1-5-3-6-2-4.

Distributor Specifications

The distributor's dwell angle was 36 degrees. Dwell angle refers to the number of degrees the distributor cam rotates through while the ignition points are closed. The ignition point gap at the extreme open position was .025 inch. The breaker-arm spring tension must fall within 17 to 20 ounces. Correct spring tension prevents the ignition points from bouncing at high engine speeds.

Ignition Timing

A numerical timing specification was not used for the 226 in 1950. Instead, the groove on the edge of the crankshaft's pulley must align with the tip of the timing pointer.

Valve Lash

Unlike most engines, where the valve lash is measured and adjusted when the engine is hot, the 226's valve lash must be measured when the engine is cold. Valve lash refers to the distance between the tip of the rocker arm and the top of the valve. The intake valve's lash was .010 inch. The exhaust valve's lash was .014 inch.

Idle Speed

The 226 must idle at 475 revolutions per minute if equipped with a manual transmission and at 440 rpm if equipped with an automatic transmission.

Cylinder Head Torque

The cylinder-head bolts must be tightened to between 65 and 70 foot-lbs. of torque.

 Tune-Up Specifications for a 1990 5.7 Liter 3/4-Ton Chevy Suburban 4x4

Spark Plugs

The 1990 Suburban's 5.7-liter requires AC Delco spark plugs with the part number CR43TS, however, they can be cross-referenced to another brand, if needed. These plugs must have a gap of .035 inches and the gap must be checked prior to installation. When installing the new spark plugs, they must be torqued to 11 foot-pounds.

Spark Plug Wires

The spark plug wires can be picked up at any parts store and are pulled off and pushed on by hand. As you pull off each spark plug wire, make certain you replace it with a new one immediately to avoid mixing up the firing order. The firing order of the 5.7-liter is 1-8-4-3-6-5-7-2 and the distributor rotates clockwise. The cylinder numbers working from the front driver's side and going counterclockwise around the engine are 1-3-5-7-8-6-4-2.

Air Filter

The air filter is housed on top of the engine in a circular metal housing. Remove the nut at the top of the air filter housing and pull the cover off to access the air filter. When reinstalling the air filter cover, make certain to torque the nut to only 18 inch-pounds to prevent breaking the stud.

 Tuneup Specifications for a 1967 Pontiac 326 CI

Spark Plugs

The 326 engine was equipped with type 45S spark plugs. Spark plug gap was .035.


The 326 did not feature adjustable ignition points as with most other engines. Instead, the distributor's adjusting screw must be turned in a clockwise direction until the engine misfires, then rotated in the opposite direction one-half turn. Dwell angle was 30 degrees.

Ignition Timing

Ignition timing was six degrees before top dead center.


Each cylinder must produce a compression rating within a range of 140 and 180 pounds.

Fuel Pump Pressure

Fuel pump pressure at the outlet fitting must be between 5 and 6.5 pounds.

Idle Speed

If the 326 with the manual transmission did not feature the Air Injection Reactor (AIR) Emission System, the factory idle speed was 600 revolutions per minute (rpm). If equipped with the AIR system, idle speed was 700 rpm. The 326 with the automatic transmission and no AIR system yielded an idle speed of 500 rpm. This model equipped with the AIR system displayed an idle speed of 600 rpm.

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