Holley headers and mounts

MechMan

MechMan

Greasemonkey
Sep 13, 2018
225
38
28
Long Island NY
#1
I am looking at the Holley headers and mounts for my LS3 swap into a 83-88 Monte Carlo. My main concern is clearance with the knock sensors since they will be the GEN III type since I am going DBC. Whjat is everyone's thoughts on this? Will the headers clear the sensors and how much modification is needed to get everything to fit properly?
 
Last edited:
Injectedcutty

Injectedcutty

Comic Book Super Hero
Nov 24, 2014
3,537
8,767
113
Louisville, KY
#2
You should have ZERO fitment issues with headers as the Gen3 LS based engines have the knock sensors in the intake valley, and not in the heads. The wiring connects both, and when intake is on they disappear.
20171214_162548-jpg.101631
 
MechMan

MechMan

Greasemonkey
Sep 13, 2018
225
38
28
Long Island NY
#3
You should have ZERO fitment issues with headers as the Gen3 LS based engines have the knock sensors in the intake valley, and not in the heads. The wiring connects both, and when intake is on they disappear. View attachment 101631
The LS3 has the knock sensors on the side of the block. As far as I know they cannot be placed under the valley cover. They must be moved to the side.
 
MechMan

MechMan

Greasemonkey
Sep 13, 2018
225
38
28
Long Island NY
#4
I am looking at the Holley headers and mounts for my LS3 swap into a 83-88 Monte Carlo. My main concern is clearance with the knock sensors since they will be the GEN III type since I am going DBC. Whjat is everyone's thoughjts on this? Will the headers clear the sensors and how much modification is needed to get everything to fit properly?
I apologize I meant to write LS3.
 
Wraith

Wraith

Royal Smart Person
Jan 13, 2013
1,063
2,631
113
DFW, TX
#5
I'll play. Have you looked at where the LS3 knock sensors are located? If your headers are hitting that you have other problems.

proxy.php?image=https%3A%2F%2Fwww.corvetteforum.com%2Fforums%2Fattachments%2Fc5-tech%2F47645999d1261159971-where-do-knock-sensors-go-on-ls3-block1.jpg&hash=2a2165404046048d7c61606cc855f2c3
 
MechMan

MechMan

Greasemonkey
Sep 13, 2018
225
38
28
Long Island NY
#7
I'll play. Have you looked at where the LS3 knock sensors are located? If your headers are hitting that you have other problems.

proxy.php?image=https%3A%2F%2Fwww.corvetteforum.com%2Fforums%2Fattachments%2Fc5-tech%2F47645999d1261159971-where-do-knock-sensors-go-on-ls3-block1.jpg&hash=2a2165404046048d7c61606cc855f2c3
I undersatnd where they are installed on the LS3 block. My concern is the GEN III Knock Sensors are not the flat type and will stick out a bit.
 
MechMan

MechMan

Greasemonkey
Sep 13, 2018
225
38
28
Long Island NY
#9
I have the hooker headers with an LS3 / L92 set up....No clearance issues.
Was there any modifications needed or did the headers fit without issue?
 
fleming442

fleming442

Geezer
Dec 26, 2013
6,235
7,166
113
#10
I'll play. Have you looked at where the LS3 knock sensors are located? If your headers are hitting that you have other problems.

proxy.php?image=https%3A%2F%2Fwww.corvetteforum.com%2Fforums%2Fattachments%2Fc5-tech%2F47645999d1261159971-where-do-knock-sensors-go-on-ls3-block1.jpg&hash=2a2165404046048d7c61606cc855f2c3
If they're here, they'd hit the crossmember well before they hit the header. They're below the motor mounts.
 

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