Piston dish size for 89 vette...
Thread Starter
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Piston dish size for 89 vette...
Guys,
Could someone please verify what cc the 4 dishes in the stock pistons are sized at. Thanks I need the information to diagnose my car! Thanks a million :cheers:
Could someone please verify what cc the 4 dishes in the stock pistons are sized at. Thanks I need the information to diagnose my car! Thanks a million :cheers:
Le Mans Master
Joined: Feb 1999
Posts: 6,172
Likes: 11
From: somers, ny
Re: Piston dish size for 89 vette... (ski_dwn_it)
HaHaHa......good luck Jess!!!
When i did mine, i couldn't find anyone that could answer that question. no one knew which piston was in the engine...and even after i pulled the heads off and got the part number off the piston....couldn't get a straight answer. I couldn't even find anyone at TRW (who made the pistons) to give me the spec. I had to measure it myself.
My pistons have one BIG valve relief across the entire piston. It measured about 4.5ccs. You have 4 smaller valve reliefs, which i can't see being any bigger than say 5-6ccs (assuming there is no dish). I've seen pictures of some stock pistons with 4 reliefs that looked like they had a small dish to them, but maybe it was the photo. You might wanna contact Scorp...he might still have his heads off or maybe he measured his reliefs.
When i did mine, i couldn't find anyone that could answer that question. no one knew which piston was in the engine...and even after i pulled the heads off and got the part number off the piston....couldn't get a straight answer. I couldn't even find anyone at TRW (who made the pistons) to give me the spec. I had to measure it myself.
My pistons have one BIG valve relief across the entire piston. It measured about 4.5ccs. You have 4 smaller valve reliefs, which i can't see being any bigger than say 5-6ccs (assuming there is no dish). I've seen pictures of some stock pistons with 4 reliefs that looked like they had a small dish to them, but maybe it was the photo. You might wanna contact Scorp...he might still have his heads off or maybe he measured his reliefs.
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
You might wanna contact Scorp...he might still have his heads off or maybe he measured his reliefs.
Best I can do is 2 different angles...
...also there is a small amount of carbon buildup still in my reliefs as the roloc disc couldn't really get into it tightly.
