Grade 5 Or Grade 8 Intake Bolts
#2686162
08/09/19 10:33 PM
08/09/19 10:33 PM
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Joined: Jun 2013
Posts: 869 Keizer, Oregon U.S.A.
elmor353
OP
super stock
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OP
super stock
Joined: Jun 2013
Posts: 869
Keizer, Oregon U.S.A.
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Need to pick up some intake bolts for a 360. Leaning towards grade 5 bolts. Isn't grade 8 overkill for an intake manifold? Your thoughts would be appreciated.
Last edited by elmor353; 08/09/19 10:34 PM.
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Re: Grade 5 Or Grade 8 Intake Bolts
[Re: elmor353]
#2686236
08/10/19 09:41 AM
08/10/19 09:41 AM
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Joined: Jan 2003
Posts: 4,267 Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,267
Morrow, OH
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Grade 5 for sure. Cast iron and aluminum can’t handle grade 8 torques.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Grade 5 Or Grade 8 Intake Bolts
[Re: markz528]
#2686242
08/10/19 10:46 AM
08/10/19 10:46 AM
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Joined: Feb 2003
Posts: 16,117 Mesa, Arizona
dart4forte
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 16,117
Mesa, Arizona
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The following specs apply to:
Chrysler Small Block, LA Series, 273 c.i.d. 318 c.i.d. 340 c.i.d. 360 c.i.d. Fastener Type Torque Specs Main Cap Bolts 85 ft.-lbs. Connecting Rod Bolts (Plain) 45 ft.-lbs. Cylinder Head Bolts, 273-318 85 ft.-lbs.* Cylinder Head Bolts, 340-360 95 ft.-lbs.* Rocker Shaft Bracket Bolts 17 ft.-lbs. Intake Manifold Bolts 35 ft.-lbs. Oil Pump Cover Bolt 95 in.-lbs. Oil Pump Attaching Bolt 35 ft.-lbs. Oil Pan Bolts 15 ft.-lbs. Cam Locking Bolt 35 ft.-lbs. Cam Thrust Plate Bolts 210 in.-lbs. Harmonic Damper Bolt 135 ft.-lbs. Flywheel/Flexplate Bolts 55 ft.-lbs. Flywheel Housing to Engine Block Bolts 50 ft.-lbs. Flexplate to Torque Converter Bolts 270 in.-lbs. Clutch Housing Bolts 30 ft.-lbs. Front Cover Bolts 30 ft.-lbs. Water Pump Bolts 30 ft.-lbs. *Follow factory torque sequence
Notes These specs are for stock-type bolts with light engine oil applied to the threads and the underside of the bolt head. Moly and other lubes offer reduced friction and increased bolt tension, which will affect the torque figure. If you use aftermarket performance bolts like ARP's, you should follow the recommended torque specifications. Please note that some specifications are in inch-pounds, rather than foot-pounds. Read the chart carefully to prevent broken bolts due to excessive torque.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: Grade 5 Or Grade 8 Intake Bolts
[Re: elmor353]
#2686247
08/10/19 11:05 AM
08/10/19 11:05 AM
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Joined: Jul 2011
Posts: 953 Chicago
PurpleBeeper
super stock
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super stock
Joined: Jul 2011
Posts: 953
Chicago
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I'm with these guys all the way...grade 5. There's no need for grade 8 on an intake and Heaven forbid you break a bolt, grade 8's are a PIA to get out
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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