How much header clearance? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pat · 07-12-2005, 12:52 PM

I dropped in my engine and I have between 1/8 and 3/16 or so of clearance with the engine mount. Do I need to shim with some washers? Im thinking this wont be enough clearance when the engine torques or whatever else.

shifty · 07-12-2005, 01:45 PM

I realize this won't be much help, but with my inline 6, I have less than 5mm of clearance between my headers and the motor mount.

pat · 07-13-2005, 10:25 AM

So do you have any problems?

shifty · 07-13-2005, 10:55 AM

It's not a daily driver. The headers interfere with my clutch linkage (Z-bar), throttle linkage.

The engine runs without problems, but I haven't driven it so I don't know what would happen if I hit a bump. I have no problems revving the engine. But with no exhaust, yet (headers only) it sounds like a freakin motorcycle gang in my garage.

72MARIO · 07-13-2005, 11:22 AM

I think you are going to be really close. But you might get away with it. Give it a try unless they are ceramic coated then you may not want to chance chipping the coating.

pat · 07-13-2005, 11:26 AM

They are ceramic coated so I want to be sure I have enough clearance. How much clearance do I need? Ill just stick some washers in b/w until I can get what i need.

ac102nv · 07-13-2005, 06:36 PM

Pat, may I ask a couple ??? ?
What engine do you have, v8?
Which side (if not both) is close?
Which part of the motor mount? Tower I'm assuming.

pat · 07-14-2005, 09:56 AM

I have a 383. I think its close on both sides. Its really close to the top of the tower, almost level with the framerail.

ac102nv · 07-14-2005, 04:47 PM

You should be fine on the driver side, but may have a little trouble on the pass. The 383 will have plenty torque and with rubber motor mounts may allow it to hit. Not sure of a great way to correct....

07-12-2005, 12:52 PM	#1
pat Senior Member Join Date: Jul 2002 Location: Lindsay, TX Posts: 1,245	How much header clearance? I dropped in my engine and I have between 1/8 and 3/16 or so of clearance with the engine mount. Do I need to shim with some washers? Im thinking this wont be enough clearance when the engine torques or whatever else. __________________ 68 Chevy 383/350 w/shift kit, 380hp/425ft-lbs, 4.5/5 drop, 17" TT2s 64 Cadillac Sedan DeVille

07-12-2005, 01:45 PM	#2
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	I realize this won't be much help, but with my inline 6, I have less than 5mm of clearance between my headers and the motor mount. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

07-13-2005, 10:25 AM	#3
pat Senior Member Join Date: Jul 2002 Location: Lindsay, TX Posts: 1,245	So do you have any problems? __________________ 68 Chevy 383/350 w/shift kit, 380hp/425ft-lbs, 4.5/5 drop, 17" TT2s 64 Cadillac Sedan DeVille

07-13-2005, 10:55 AM	#4
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,373	It's not a daily driver. The headers interfere with my clutch linkage (Z-bar), throttle linkage. The engine runs without problems, but I haven't driven it so I don't know what would happen if I hit a bump. I have no problems revving the engine. But with no exhaust, yet (headers only) it sounds like a freakin motorcycle gang in my garage. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.

07-13-2005, 11:22 AM	#5
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	I think you are going to be really close. But you might get away with it. Give it a try unless they are ceramic coated then you may not want to chance chipping the coating. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

07-13-2005, 11:26 AM	#6
pat Senior Member Join Date: Jul 2002 Location: Lindsay, TX Posts: 1,245	They are ceramic coated so I want to be sure I have enough clearance. How much clearance do I need? Ill just stick some washers in b/w until I can get what i need. __________________ 68 Chevy 383/350 w/shift kit, 380hp/425ft-lbs, 4.5/5 drop, 17" TT2s 64 Cadillac Sedan DeVille

07-13-2005, 06:36 PM	#7
ac102nv Registered User Join Date: Jul 2004 Location: Northern Nevada Posts: 156	Pat, may I ask a couple ??? ? What engine do you have, v8? Which side (if not both) is close? Which part of the motor mount? Tower I'm assuming. __________________ '72 C10 lwb 454/TH400

07-14-2005, 09:56 AM	#8
pat Senior Member Join Date: Jul 2002 Location: Lindsay, TX Posts: 1,245	I have a 383. I think its close on both sides. Its really close to the top of the tower, almost level with the framerail. __________________ 68 Chevy 383/350 w/shift kit, 380hp/425ft-lbs, 4.5/5 drop, 17" TT2s 64 Cadillac Sedan DeVille

07-14-2005, 04:47 PM	#9
ac102nv Registered User Join Date: Jul 2004 Location: Northern Nevada Posts: 156	You should be fine on the driver side, but may have a little trouble on the pass. The 383 will have plenty torque and with rubber motor mounts may allow it to hit. Not sure of a great way to correct.... __________________ '72 C10 lwb 454/TH400

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