Engine Builders-KB356 Piston Milling

[MOPAROFFICIAL]

I am (on average) .085 in the hole. Low .081 high .089 averages after checking 4 spots on each piston then averaging those.

Will CC the cylinder hopefully tomorrow. I suspect 62-63cc. Should put me 9.2-9.5 if so with dynamic compression of 7.7-7.9

Good.
Once you cc it, you'll know.
Based on what you said and considering the quench head milled off down to the dish 'adding a guesstimate of 3cc'

 

[Brooks James]

The 160 degree thermostat is a BIG deal. You don’t have near enough cylinder head to warrant a 114 LSA. I’d leave the compression where it and use a different cam. Don’t know what you have for gear or converter but both of those affect the CR you can use.

I don’t understand the 114 lsa part, please enlighten me

 

[yellow rose]

I don’t understand the 114 lsa part, please enlighten me

LSA is part of overlap. The better the cylinder head, the higher the compression ratio the less overlap you need.

Splitting the duration and opening up the LSA to get the power curve to hang on past peak or at least the same peak power will kill power in the middle every time.

 

[MOPAROFFICIAL]

More visual guidance

 

[33IMP]

Not just the quench pad gone then, looks like the whole built up area under the q-pad is gone on the op's pistons.... if i had to guess, it has lost at least a half point, probably more. But until you have actual measurements, its just that....a guess.

 

[thomasfouraker]

Not just the quench pad gone then, looks like the whole built up area under the q-pad is gone on the op's pistons.... if i had to guess, it has lost at least a half point, probably more. But until you have actual measurements, its just that....a guess.

Yea whoever built this motor milled it completely flat to the opposing crown of the piston.

 

[MOPAROFFICIAL]

Those in the pic... I have already milled .045 off the pads...

I'm sure it's around 8.1.

 

[thomasfouraker]

Those in the pic... I have already milled .045 off the pads...

I'm sure it's around 8.1.

Sounds like it’s calling for boost.

 

[33IMP]

Sounds like it’s calling for boost.

Yep. Time to mount up the powerdyne or the Kenne-Bell!
I havent run any numbers, but.... with that much of the piston gone, and being .080+ in the hole....i think mopar official is right, low 8s.
Still... measure and calculate. If you want to use the blower, you may want to juggle numbers with head gasket thickness. Big difference between .020 steel shim and .080 cometics. (You dont have any quench to lose either way)