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Re: 340 build questions [Re: Cab_Burge] #2954981
08/18/21 10:46 AM
08/18/21 10:46 AM
Joined: Jan 2017
Posts: 289
Nevada
M
merpar Offline
enthusiast
merpar  Offline
enthusiast
M

Joined: Jan 2017
Posts: 289
Nevada
Sorry Cab, if you build a motor with hyper's and leave standard end gaps you will break some stuff. The hyper pistons retain more heat in the top. Therefore you need more end gaps. Why would you put more gap on the second ring? Just follow the directions that come with the pistons and you will be good.

Re: 340 build questions [Re: merpar] #2954997
08/18/21 12:00 PM
08/18/21 12:00 PM
Joined: Jan 2003
Posts: 1,022
Andrews,In. U.S.of A.
6
67_Satellite Offline
super stock
67_Satellite  Offline
super stock
6

Joined: Jan 2003
Posts: 1,022
Andrews,In. U.S.of A.
I put a cheap set of hypers in a 390 ford for a friend in 2012.They are still in there in one piece. Instructions said to gap at usual spec. I opened them up by quite a bit instead. I'm the only one who knows they are wider, if they were too tight and lifted the land, everyone would know.

Re: 340 build questions [Re: merpar] #2955044
08/18/21 02:50 PM
08/18/21 02:50 PM
Joined: Aug 2003
Posts: 43,206
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,206
Bend,OR USA
I've learn that wider end gaps are way better than a tiny bit, even .000010, to tight will kill parts whiney
I am not a fan of cast hyper type pistons either down
Forged pistons live longer with the same abuse twocents work
I do know that there are no parts made that can't be hurt by the right, parts killer customers, persons shruggy
I thought I remember reading the instructions on a set of the early KB hyper pistons saying to open the 2nd ring gap way up, not the top ring confused


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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