L98 Piston question
Thread Starter
Racer
Joined: May 2006
Posts: 426
Likes: 16
From: Concord CA
87Stocker ....Thanks..
I have only had this 88' TPI for a month now.. I was just wondering as on cold start up in the moring.. I hear what sound like Forged piston slap, But does go away once it is warmed up. I guess that a 147k engine would/should have some.. LOL.
I did try searching for a while, but didn't come across any hits.
I have only had this 88' TPI for a month now.. I was just wondering as on cold start up in the moring.. I hear what sound like Forged piston slap, But does go away once it is warmed up. I guess that a 147k engine would/should have some.. LOL.
I did try searching for a while, but didn't come across any hits.
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by mgbss
I may have to re-think boring my 85, the cylinders are ok and the pistons looked good maybe I will build a 380 instead of a 383.
If I replace them do they have any value to anybody?
If I replace them do they have any value to anybody?
You were going to waste money boring cylinders and replacing pistons where, "the cylinders are ok and the pistons looked good"???
1985 was the ONLY L98 to get forged pistons from the factory. Contrary to post #2, 1986 did not come with forged pistons.
Originally Posted by Muffin
This comes up about once a year. My 85 FSM says hyper. The engine has been gone a long time so I can't look.
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Instructor
Joined: Sep 2006
Posts: 133
Likes: 0
From: Mt Pleasant Michigan
CFI-EFI
It was said half in humor, but also to learn.
As far as over boring a good bore or as you said "Waste Money" the fact is the bore has a lot of miles on them, If you buy a kit the pistons are basically free as compared to buying everything separate and if I go with new Pistons I can build as a package not what will work with the Stock ones.
Joe
It was said half in humor, but also to learn.
As far as over boring a good bore or as you said "Waste Money" the fact is the bore has a lot of miles on them, If you buy a kit the pistons are basically free as compared to buying everything separate and if I go with new Pistons I can build as a package not what will work with the Stock ones.
Joe
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by evmlarry
Holy Crap I thought you were a goner CFI-EFI. Good to see you and your knowledge in these C4s back. 
Originally Posted by mgbss
If you buy a kit the pistons are basically free as compared to buying everything separate and if I go with new Pistons I can build as a package not what will work with the Stock ones.
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Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
[QUOTE=mgbss;1563980226]I may have to re-think boring my 85, the cylinders are ok and the pistons looked good maybe I will build a 380 instead of a 383.
/QUOTE]
If you can get the stock pistons to work with 3.75 stroker crank you will be the first
/QUOTE]
If you can get the stock pistons to work with 3.75 stroker crank you will be the first
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
" The Pistons are made of cast aluminum alloy using two compression rings and one oil control ring"
"Connecting rods are made of forged steel."
Instructor
Joined: Sep 2006
Posts: 133
Likes: 0
From: Mt Pleasant Michigan
I apologize as this is going nowhere.
If new Pistons are used and they will be, I can spec them for the heads and compression that is needed. If I were to use the stock Pistons I would have to base the heads, compression, ect around what I have, not what might be best. But as Rodj stated, they wont work on a stroker anyway.
Joe
If new Pistons are used and they will be, I can spec them for the heads and compression that is needed. If I were to use the stock Pistons I would have to base the heads, compression, ect around what I have, not what might be best. But as Rodj stated, they wont work on a stroker anyway.
Joe
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by mgbss
But as Rodj stated, they wont work on a stroker anyway.
Joe
Joe
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RACE ON!!!
Racer
Joined: Dec 2007
Posts: 298
Likes: 1
From: Escondido CA
If my memory serves me correctly, I believe you just have to use stock 400 or 5.5 in. long rods!
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
3.750 stroker pistons run about .125 different lower CH to accomodate the extra stroke.
Allowing .025 for avg deck height that would put the stock piston .100 out of the bore unless you change rods?