Holley's EFI Engine Connector Kits provide every engine connector used on Holley EFI main harnesses in one package, so builders assembling a custom engine harness don't have to hunt down individual connectors, pins, seals, and TPAs. The 570-103 kit covers LSX applications with genuine OEM-quality connectors.
Specifications:
- Application: LSX engine main harness
- Connector Quality: OEM-quality
- Terminal Type: Assorted male/female
- Contents: Connectors, pins, seals, and TPAs
- Pairs With: Holley flying lead harness, part number 558-126
- Part Number: 570-103
Intended for builders assembling a custom LSX engine harness; pairs with Holley's flying lead harness (558-126).
FAQ
What is included in the LSX Main Harness Connector Kit?
It includes all the connectors, pins, seals, and TPAs used on Holley EFI LSX main harnesses.
What is this kit used for?
It's used to build a custom LSX engine harness from scratch, so you don't have to source individual connectors separately.
Does this kit pair with another Holley product?
Yes, it pairs well with Holley's flying lead harness, part number 558-126.
Are these genuine OEM connectors?
Yes, OEM-quality connectors are used throughout the kit.

