Champion 821-1 Spark Plug

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Rating
Brand	Code
3.3 / 5 Overall
Champion	821-1
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
3.8 / 5 Design
Cut Back	Standard
Ground type	Center type

Specifications
Gap	Heat range
1mm (.039")	77
⌀14mm	1.25mm
Thread diameter	Thread pitch
12.7mm (1/2")	21mm (13/16")
Reach	Hex size
Gasket	Solid
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

How we find alternative spark plugs How we rate spark plugs

Cross-reference (1)

Alternative spark plugs found in cross-reference docs provided by manufacturers

B7HS-10

Copper

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 7

Deep reference (4)

A second level of cross-reference: if A=B and B=C, then A=C

XS4093

Iridium-Platinum

4.2/ 5

.031"12.7mm, ⌀14x1.25HR 4

L77JC4 MARINE

Copper

-

3.3/ 5

.039"12.7mm, ⌀14x1.25HR 77

L77JC4

Copper

-

3.3/ 5

.039"12.7mm, ⌀14x1.25HR 77

4093

Copper

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 4

Same specs (2)

Products that have identical characteristics that impact interchangability

L77JC4 MARINE

Copper

-

3.3/ 5

.039"12.7mm, ⌀14x1.25HR 77

L77JC4

Copper

-

3.3/ 5

.039"12.7mm, ⌀14x1.25HR 77