Valve hitting piston?

krazedstang

15 Year Member

Mar 23, 2009

670

278

104

Streamwood

Jun 9, 2025

#1

• Jun 9, 2025

• #1

Pulling apart this engine I pulled from my 97. Previous owner did PI swap with comp XE262AH. Had a tick noise so I parked it and decided to swap in another NPI short block and PI top end. I thought it looked like the piston hitting a valve on the lower right side of each piston. Maybe timing skipped a tooth. What do you think caused this? Thanks

 

Reactions: stormsedge

squeak93

15 Year Member

Jun 2, 2005

2,256

358

164

Joplin, Missouri

Jun 12, 2025

#2

• Jun 12, 2025

• #2

Comp 262 need to be retarded a tad to not hit a NPI short block. Installing them without degreeing is not recommended as they are just on the cusp of hitting size wise.

 

krazedstang

15 Year Member

Mar 23, 2009

670

278

104

Streamwood

Jun 12, 2025

#3

• Jun 12, 2025

• #3

squeak93 said:

Comp 262 need to be retarded a tad to not hit a NPI short block. Installing them without degreeing is not recommended as they are just on the cusp of hitting size wise.

Click to expand...

Yeah they were installed when I bought the car, so I'm not sure if they were degreed or not.

 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

Admin Dude

Jan 4, 1985

42,893

21,073

234

Box behind Walmart

Jun 12, 2025

#4

• Jun 12, 2025

• #4

krazedstang said:

Yeah they were installed when I bought the car, so I'm not sure if they were degreed or not.

Click to expand...

I'd say you lucked out!

Inspect whatever pieces/parts that would normally bend with piston interference. It would be the pushrods on my engine.