LS1 to LS3 coils swap Help needed.

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Oct 6, 2016 | 09:27 AM

john j oliver

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From: chester va

LS1 to LS3 coils swap Help needed.

Forum,
I have an LS1 engine that is modified and want to put Holley's tall valve covers on the motor to dress it up. Well in not reading the fine print the Holley tall valve covers require LS3 coils which have a 72mm bolt spacing. The LS3 coils have a different pig tail connector than my LS1 coils. What can I do to connect LS3 coils to my LS1 engine harness? Your help would be appreciated.
Thanks

Oct 7, 2016 | 07:29 AM

Project GatTagO

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From: Little Austin

Buy the LS3 coil harnesses. They are available from AC Delco as a service part. Look up on Rockauto.com.

Andrew

Oct 7, 2016 | 08:48 AM

john j oliver

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From: chester va

so I take it that the LS3 coil harness will plug in directly to the LS1 engine harness? Is that correct?
Thanks
John

Oct 7, 2016 | 08:53 AM

Project GatTagO

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From: Little Austin

Yes.

Andrew

Oct 7, 2016 | 09:01 AM

john j oliver

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From: chester va

Awesome!!! Many thanks. John

Oct 7, 2016 | 10:03 AM

Project GatTagO

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From: Little Austin

These are more expensive than I remember them being...

http://www.rockauto.com/en/moreinfo....444465&jsn=536

Oct 7, 2016 | 01:34 PM

stevieturbo

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From: Norn Iron

When I bought some from Nook & Tranny about 3 years ago they were about $40 each side.

Holy ****...looks like almost double that now !! LOL

http://www.nookandtranny.com/mm5/mer...Category_Code=

If you're bothered, you could just buy 4 coil connectors and just re-terminate your existing loom, would be cheaper.

Pretty sure that's it

https://www.bmotorsports.com/shop/pr...roducts_id/800

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Oct 10, 2016 | 07:06 AM

04Z06vette

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I wonder if you could fasten the LS1 coils to the holley covers using just one bolt or maybe making a little adapter plate to pick up the second bolt? Or maybe even use some epoxy to hold the other side? sure a lot cheaper that a new harness and new coils

Oct 10, 2016 | 08:32 AM

#10

Project GatTagO

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From: Little Austin

The terminals are the same, only the connector body is different.

Andrew

Oct 10, 2016 | 10:05 AM

#11

EFIHARNESS

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The connectors on the harness end are the same. The connectors @ the coils are different (150 pull to seat, 150 metric pack) so the terminals are different as well.
Steve