How much room do I have to shim the drivers motor mount for headers - ZR-1 Net Registry Forums

Corvette95 · 12-07-2020

How much room do I have to shim the drivers side motor mount for the OBX headers to clear the steering shaft? I am also coating and wrapping them in titanium wrap so I will likely have to dimple them too. What shim size (max thickness) can I use without engine touching hood? I know it is close already. Thanks.

secondchance · 12-07-2020

Quote:

Originally Posted by Corvette95

How much room do I have to shim the drivers side motor mount for the OBX headers to clear the steering shaft? I am also coating and wrapping them in titanium wrap so I will likely have to dimple them too. What shim size (max thickness) can I use without engine touching hood? I know it is close already. Thanks.

Of 5 ZR-1s worked on by Wazoo, none needed shimming. 4 were Stainless works and mine was OBX. Apart from shorter length to accommodate fake cats, OBX runners are almost exact duplicate of Stainless Works.

Corvette95 · 12-07-2020

Thanks, I have read posts saying both yes and no, most requiring a dimple at least. I know mine are going to be thicker due to the coating and wrap.

wfot · 12-08-2020

check the health of the motor mounts... I hear they can deteriorate, this would drop the motor down some... worth a check if you are in there

Mr Blue · 12-08-2020

Mine only required dimpling #1 tube by the steering shaft. I used the Maximizer headers that are the same as OBX without the polished finish.
Good Luck

Jagdpanzer · 12-08-2020

Keep in mind it's possable to push the engine over to the right a few mm if necessary before tightening the mounts down.

Corvette95 · 12-08-2020

Quote:

Originally Posted by Jagdpanzer

Keep in mind it's possable to push the engine over to the right a few mm if necessary before tightening the mounts down.

Thanks, would this hurt the driveline tolerence, I currently have the C-Beam off waiting on C-Beam plates from Bill B.

A26B · 12-08-2020

If you have kids, there may be some silly putty or clay about. But a ball on the plenum & close the hood. Check the clay/putty & measure the thickness to determine hood clearance.

Corvette95 · 12-08-2020

Quote:

Originally Posted by A26B

If you have kids, there may be some silly putty or clay about. But a ball on the plenum & close the hood. Check the clay/putty & measure the thickness to determine hood clearance.

That's a really good idea, what do you think the highest spot would be..seems like the front of the throttle body and ECM. No kids, but I have some modeling clay!

Jagdpanzer · 12-08-2020

Quote:

Originally Posted by Corvette95

Thanks, would this hurt the driveline tolerence

Should be ok

12-07-2020	#3
Corvette95 Join Date: Jan 2006 Location: Decatur, AL Posts: 1,105	Re: How much room do I have to shim the drivers motor mount for headers Thanks, I have read posts saying both yes and no, most requiring a dimple at least. I know mine are going to be thicker due to the coating and wrap. __________________ Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454

12-08-2020	#4
wfot Join Date: Jan 2009 Location: New jersey Posts: 156	Re: How much room do I have to shim the drivers motor mount for headers check the health of the motor mounts... I hear they can deteriorate, this would drop the motor down some... worth a check if you are in there

12-08-2020	#5
Mr Blue Join Date: Feb 2013 Location: Tallmadge OH Posts: 116	Re: How much room do I have to shim the drivers motor mount for headers Mine only required dimpling #1 tube by the steering shaft. I used the Maximizer headers that are the same as OBX without the polished finish. Good Luck

12-08-2020	#6
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,644	Re: How much room do I have to shim the drivers motor mount for headers Keep in mind it's possable to push the engine over to the right a few mm if necessary before tightening the mounts down. __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

12-08-2020	#8
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,373	Re: How much room do I have to shim the drivers motor mount for headers If you have kids, there may be some silly putty or clay about. But a ball on the plenum & close the hood. Check the clay/putty & measure the thickness to determine hood clearance. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

12-07-2020	#1
Corvette95 Join Date: Jan 2006 Location: Decatur, AL Posts: 1,105	How much room do I have to shim the drivers motor mount for headers How much room do I have to shim the drivers side motor mount for the OBX headers to clear the steering shaft? I am also coating and wrapping them in titanium wrap so I will likely have to dimple them too. What shim size (max thickness) can I use without engine touching hood? I know it is close already. Thanks. __________________ Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454