Need to know BB Oil pan torque sequence and specs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**CPNE** · 06-11-2003, 12:53 PM

What is are the torque specs and sequence for a 402 BB oil pan? My service manual lists 135 inch pounds but does not give tightening order. Also, why is BB torque higher than small block which is 80 inch pounds.

Thanks in advance

tom hand · 06-11-2003, 01:30 PM

Never seen any manual that had a sequence for the oil pan. The torque listed is different because that is the clamping force the factory wants on the factory gasket. If you are using aftermarket gaskets the spec doesn't mean much anyway. If you do a search on torque specs yopu will see that most specs don't even list specs for oil pan, timing cover, etc. I aways use a speed wrench and just snug them up...never had a problem. On oil pans and valve covers too loose is aways better than too tight...you ussally need to snug them after the motor has been heated up a few times if you want them to be leak free and there is no way to torque them with the motor installed.

**CPNE** · 06-11-2003, 01:39 PM

Tom,

Am I correct in assuming your recomendation is to snug them up and just start at one point and work your way around the pan?

Yes, these are aftermarket gaskets

tom hand · 06-11-2003, 02:45 PM

If you are using a cork gasket, I always "glue" them to the block with silicone or your favorite sealer and be really careful with the end pieces cause if it leaks it will be where the end pieces meet the gasket. Then I coat the whole oil pan side with wheel bearing grease. I snug the four end bolts up first and do the sides randome. I snug them till it just sweezes the gasket. Snug them again after a few hundred miles. If you have one of those screwdriver type handles for a socket use it...it is easily enough to over torque with one of those. And if you ever have to go back and pull the oil pan in the vehicle you will be so glad you greased one side of the gasket. There are many new fancy one piece gaskets out there but I don't think they are worth the cost unless you have a race car that gonna pull the pan many times a year.

**CPNE** · 06-11-2003, 02:49 PM

sounds like a good plan. Thanks!

06-11-2003, 12:53 PM	#1
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Need to know BB Oil pan torque sequence and specs What is are the torque specs and sequence for a 402 BB oil pan? My service manual lists 135 inch pounds but does not give tightening order. Also, why is BB torque higher than small block which is 80 inch pounds. Thanks in advance __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

06-11-2003, 01:30 PM	#2
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Never seen any manual that had a sequence for the oil pan. The torque listed is different because that is the clamping force the factory wants on the factory gasket. If you are using aftermarket gaskets the spec doesn't mean much anyway. If you do a search on torque specs yopu will see that most specs don't even list specs for oil pan, timing cover, etc. I aways use a speed wrench and just snug them up...never had a problem. On oil pans and valve covers too loose is aways better than too tight...you ussally need to snug them after the motor has been heated up a few times if you want them to be leak free and there is no way to torque them with the motor installed. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

06-11-2003, 01:39 PM	#3
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Tom, Am I correct in assuming your recomendation is to snug them up and just start at one point and work your way around the pan? Yes, these are aftermarket gaskets __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

06-11-2003, 02:45 PM	#4
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	If you are using a cork gasket, I always "glue" them to the block with silicone or your favorite sealer and be really careful with the end pieces cause if it leaks it will be where the end pieces meet the gasket. Then I coat the whole oil pan side with wheel bearing grease. I snug the four end bolts up first and do the sides randome. I snug them till it just sweezes the gasket. Snug them again after a few hundred miles. If you have one of those screwdriver type handles for a socket use it...it is easily enough to over torque with one of those. And if you ever have to go back and pull the oil pan in the vehicle you will be so glad you greased one side of the gasket. There are many new fancy one piece gaskets out there but I don't think they are worth the cost unless you have a race car that gonna pull the pan many times a year. __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

06-11-2003, 02:49 PM	#5
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	sounds like a good plan. Thanks! __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all



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