Help identifying a piston?
Thread Starter
Instructor
Joined: Oct 2002
Posts: 116
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From: Seguin Texas
Help identifying a piston?
The original pistons from my 1985 had a single wedge valve relief and were cast 336744 262-99 TRW.
I acquired an engine from a 1986 Vette that has different pistons. They have 4 valve reliefs and are cast 14088801 E6290 GM.
Are the pistons from the '86 Corvette forged pistons? I do not see why GM would have used different pistons in '86.
This is nothing important, I am just curious.
I acquired an engine from a 1986 Vette that has different pistons. They have 4 valve reliefs and are cast 14088801 E6290 GM.
Are the pistons from the '86 Corvette forged pistons? I do not see why GM would have used different pistons in '86.
This is nothing important, I am just curious.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by DarthD
The original pistons from my 1985 had a single wedge valve relief and were cast 336744 262-99 TRW.
I acquired an engine from a 1986 Vette that has different pistons. They have 4 valve reliefs and are cast 14088801 E6290 GM.
Are the pistons from the '86 Corvette forged pistons? I do not see why GM would have used different pistons in '86.
This is nothing important, I am just curious.
I acquired an engine from a 1986 Vette that has different pistons. They have 4 valve reliefs and are cast 14088801 E6290 GM.
Are the pistons from the '86 Corvette forged pistons? I do not see why GM would have used different pistons in '86.
This is nothing important, I am just curious.
RACE ON!!!
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
The pistons in my 85 have the 4 "eyebrow" valve reliefs, not a single trough design. As far as I know my engine is the original but now I wonder. Since it is coming out in a few weeks I will check to see if the pistons are forged and I'll also check the numbers on the block.
CFI, I don't doubt your word at all so maybe they changed piston design later in the model year?
CFI, I don't doubt your word at all so maybe they changed piston design later in the model year?
