Can I use a steel push rod instead of the aluminium one in the intake?

VERIFY your engine model numbers
Briggs & Stratton Intek V-Twin
Engine Model Numbers 407777 and 44P777
Cylinders 2 (Dual cylinder)

ITEM N m (Newton metres) lb-in Spark Plug Torque 20 180 Back Plate (to cylinder) 11 100 Blower Housing Screws 9 80 Breather Screws 6 55 Carburetor to Manifold 7 65 Cylinder Head Bolts 25 220 Cylinder Shield 7 65 Crankcase Cover 23 200 Engine Mounting Bolts 48 35 lb-ft Electric Clutch Mounting Bolt 75 55 lb-ft Exhaust Manifold 16 140 Fan Retainer Bolts 16 140 Flywheel Nut 203 150 lb-ft Armature Mounting Screws 3 25 Intake Manifold Bolts 9 80 Rocker Arm Adjustment Lock Nut 7 62 Rocker Support Screws 11.3 100 Valve Cover Cap Screws 11 100 Carburetor to Intake 7 65 Valve Clearance (Cold) 0.10-0.13 mm (0.004-0.005 in)
WARNING: Uneven tightening will warp the head. Tighten Cylinder Head Bolts down evenly by hand. Then using torque wrench tighten in sequence, in 9 N m (80 lb-in) increments to 25 N m (220 lb-in).
Intake valve push rods are aluminum.
Exhaust valve push rods are steel.
DO NOT interchange push rods.

Removal and Re-installation sequence for bolt removal and tightening.

Here is Holden\'s Alloytec V6 in glorious technical detail.



The global V6 engine is the first V6 engine program to address what Thomas G. Stephens, group vice president, GM Powertrain, says is a vital initiative: to develop world-class engines with fully contemporary features - such as dual overhead cams and variable valve timing - but at a competitive cost structure that allows use of the engines in a global mix of vehicles.



Exhaust: 111 degrees BTDC initial timing

50 crankshaft degrees retard authority



Compression Ratio:10.2:1



Bore Centers:103 mm



Firing Order:1-2-3-4-5-6



Fuel Shutoff:6,700 rpm



Engine Idle Speed:600 rpm



Fuel System:Sequential port fuel injection (returnless)



Engine Management:Torque-based; Bosch Motronic ME 9 32-bit micro-hybrid controller



Intake Manifold:Dual-plenum, equal-length with 2-position variable volume control (resonance tuned)



Throttle:68-mm single bore; electronic control (ETC)



Ignition:Individual coil-on-plug; individual cylinder knock control



Fuel Requirement:Premium fuel recommended



Emissions Controls:Dual close-coupled catalytic converters (1.15L ultra-thinwall ceramic)

Positive crankcase ventilation (PCV)

Intake- and exhaust-cam phasers (EGR)

Evaporative emissions system



Assembly Sites:St. Catharines, Ontario, Canada

Port Melbourne, Victoria, Australia

Material Applications



Block Material:Aluminium, precision sand-cast 319 with cast-in-place iron liners



Cylinder Head Material:Aluminium, semi-permanent mould 319



Intake Manifold:Upper: Aluminium, sand-cast 319

Lower: Aluminium, 356-T6



Exhaust Manifold:High-silicon moly cast iron



Camshaft Covers:Injection compression thermoset composite; vibration isolated



Front Cover:Diecast 380 aluminium; internal multilayer damping panels



Crankshaft:Forged steel



Connecting Rods:Sinterforged steel



Pistons:Aluminium, polymer-coated skirts, full-floating wristpins



Main Bearing Caps:6 bolt caps, copper-infiltrated sintered steel



Oil Pan:Structural diecast aluminium, steel windage and baffle plates



Additional features:Pressure-actuated piston-cooling oil jets

Extended-life sparkplugs, coolant, accessory belts

Cartridge-style, top-access oil filter

Oil-level sensor

Wide-range oxygen sensors

Aluminum is intake valve.....steel is exhaust.

hi pauly46 here

set piston to tdc compression stroke then run it down the bore a 1/4 inch

set the tappetts to inlet the bottom valve ( alloy push rod ) to a tightish 0.004" and set the
ex valve the top one ( steel push rod ) to 0.005"

setting at 1/4 pst tdc eliminates decompressor from upsetting valve clearance seting


cheers pauly46

WHEN ORDER PUSH RODS YOUR INTAKE PUSH RODS LENGH 5 3/4 INCHES , THE EXHAUST PUSH RODS LENGTH 6 INCHES. YOU NEED 8 INTAKE PUSH RODS YOU NEED 8 EXHAUST PUSH RODS. YOU CAN GO TO DEALERSHIP BUY OR AUTO PARTS STORES HAVE THEM.

Find the intake valve...the aluminum rod operates the rocker for that valve....the steel rod is toughter of course and can handle the heat from the exhaust valve. If you have the head which valve is which will be evident...the exhaust valve will be near the muffler and sooty of course.

what is your question?

Exhaust

TIG weding is next to brain surgery as far as CLEAN goes.
You must get your AL clean, either by 1. Clean with a NEW Stainless Steel brush or 2. by using a chemical from the welding house that is made just for that.
Your cup must be clean and your gas flowing at the right amount,no leaks in o-rings or hoses.
Hold your cup more vertical and keep your filler rod in the gas shield always,no in and out movement.
In short you must get everything perfect to get quality Heliarc Al welds.
Good luck, HowardRoark