General Info

Cylinder Numbers(front-to-rear) Left(operator"s) side - 1,3,5 appropriate Side - 2,4,6Firing Order1,6,5,4,3,2

Camshaft

Bearing journal Diameter - 1.8682 to 1.8692"

Lobe Lift

Intake
1988-1990 - 0.238" 1991-1995 - 0.234" 1996 - 0.2763" 1997-2000 - 0.288"Exhaust 1988-1990 - 0.260" 1991-1995 - 0.257" 1996 - 0.2855" 1997-2000 - 0.2821"Balance Shaft(1994 and later)Rear Bearing newspaper Diameter - 1.4994 come 1.5000"

Torque Specs

Balancer ShaftRetainer bolts - 120 in-lbs.Driven gear bolt - 15 add to and extr 35 degrees rotationDrive equipment retaining stud - 144 in-lbs.Camshaft Sprocket bolts/nuts - 20 ft-lbsCylinder Head Bolts1998-1995 step 1 - 25 ft-lbs action 2 - 45 ft-lbs action 3 - 65 ft-lbs1996-2000 action 1 - 22 step 2 - brief bolts - Tighten secondary 55 degrees Medium bolts - Tighten an additional 65 levels Long bolts - Tighten an additional 75 degreesExhaust Manifold nuts/ bolts(goes because that 305 c.i.d. And 350 c.i.d. Too )1988 through 1995 facility bolts - 26 ft-lbs outer bolts - 20 ft-lbsFlywheel bolts(for 305 c.i.d. And also 350 c.i.d. Also - 75 ft-lbs)Intake Manifold BoltsLower input Manifold 1988-1995 - 35 ft-lbs 1996-2000 - step 1 - 27 in-lbs action 2 - 106 in-lbs action 3 - 11 ft-lbsUpper entry Manifold(1996-2000) action 1 - 44 in-lbs step 2 - 88 in-lbsOil pan baffle nuts - 26 ft-lbsOil pan to crankcase nuts/bolts1988-1995 Nuts - 17 ft-lbs Bolts - 97 in-lbs1996-2000 - 18 ft-lbsOil pan to timing cover bolts - 70 in-lbsOil pump bolt - 65 ft-lbsRear oil seal housing to block bolts - 135 in-lbsRocker eight cover nuts/bolts - 106 in-lbsRocker arm studs - 35 ft-lbsRocker arm nuts/bolts(1995 later) - 20 ft-lbsTiming cover Bolts1988-1995 - 124 in-lbs1996-2000 - 106 in-lbsVibrator damper bolt(harmonic balancer)1988-1995 - 70 ft-lbs1996-2000 - 74 ft-lbs


Posted byadminat4:22 PM
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kiddsaid...

You are watching: Torque specs for 4.3 vortec intake manifold

4.3 eng upper intake manifold speak specification1st pass 44 in lbs & 2nd pass 80 in lbs i found on my old top intake plenum had actually sequence come torque bolts !! DON'T to buy AFTERMARKET DORMAN upper intake plenumafter 5 year the plastic to be fatigued where washers contacted the !!

May 18, 2016 at 7:08 PM

Unknownsaid...

Where go you discover that ?

August 4, 2018 at 12:06 PM

kiddsaid...

hello Amanda! the bolt holes cracked & I just torqued down 80inlbs to buy AC/Delco brand just 1 an ext tip is grease up the orange O ring approximately fuel injector connector otherwise it will shred the O ring & friend will have a huge vacuum leak the yongin of upper intake plenum is tight! p.s I've had other problem with Dorman assets like a spongy oil cooler currently leaking & problem with gas tank filler neck the rollover check ball looked favor a raisin after ~ 6month!only thing Dorman products have a life time guarantee yet they made v a quality product they wouldn't need a guaranteegood lucky & occupational safe!Tim

August 4, 2018 in ~ 5:59 PM
Unknownsaid...

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2003 and also later have roller rockers that space not adjustable. They space torqued under on pedestal. I am searcjise all over and no one pointed out this no appropriate torque. They room not like pre 03 140 actors number heads. 113 actors number heads are roller rockers.