your calculation is off as the block has a .010 deck clean up making the block 9.589...a - deck clearance is in the hole.theres only two other variables and thats stroke and rod length.sure its a 4" crank and stock length rods of 6.123?i shall agree to disagree on the re-balance........
if you did cc the heads whats the # ?

.039 gasket doesnt leave enough room for quench

this is my point.if the piston dome is out .010 forget about using a .039 hg.limits your options on head gaskets.if he used the correct magnum slugs(kb416) instead of LA slugs that require widdling then you would not have this issue.he is turning a 356 open chamber slug into a 416 which is for a closed chamber head and doesnt require any widdling.this is from the catalog and the dome elevation is different yes but regardless the height of the dome it needs to be widdled down to block deck height for a zero deck.when using piston comp ht in the formulas it does not include the dome or dish.both these slugs have identical comp ht's but one has a dome the other does not showing dome isnt included in comp ht.one is for LA and one is for MAGNUM
KB356 use with open chamber heads, has an elevated .085” quench dome.
KB416 use with closed chamber heads, no quench dome.

Quench dome elevated .050. Machining require to achieve optimum quench.
Closed chamber head requires additional clearance.
website info^^^^^kb356

 

just wanted to thank all you guys for helping me out!

anyhow...

im not sure how your getting 9.589. magnum block is 9.6-.010=9.59...no?

can you elaborate on EXACTLY why it SHOULD be rebalanced, so i can discuss that with him? both sets of pistons weigh the same according to KB.

heads were 60cc.

this build began in '05, were the 416's around back then? i cant even seem to find them for sale anywhere.

so, do we want to eliminate the dome? it seems liking eliminating the dome would make theses pistons work PERFECTLY. by shaving .085 (or .050, whichever is correct, stupid websites!)? which would give a 0 deck... almost

im still wondering why the sheet says he shaved .100 from the crowns...

would you trust these theoretical calculations and shave the dome based soley on calculations, OR mock it up and see how far above the deck the dome ACTUALLY is?

am i correct in thinking that shaving the dome has a very negligible effect on CR?

EDIT: lets assume, the quench pad is elevated .085, could he have shaved an extra .015 to attain p2v clearance?

 

how do you calculate how far the fully open valve extends beyond the deck of the head?

 

Measure how far the lowest (shallowest depth) point of the valve is in the head from the head surface. You should know what your gross lift is...... As the pistons are being machine in any event, I really wouldn't be surprised if they didn't have to have valve reliefs cut into them in any event.

 

is there anyway to calculate p2v without claying?

would the quench pad see the valves? i was thinking maybe thats why he cut .100 from it

 

You can calculate p2v, with a bit of creative math. (nothing is quite vertical/horizontal, and EVERYTHING moves.... so, makes it a bit interesting.) However, as with most things in life, how the math works out, doesn't necessarily reflect how it REALLY is. Claying is your best option. Then you will KNOW what you have to do.

 

this build is alot is requiring ALOT more STRATEGIC planning and thought than i ever could have imagined!

i would clay, but i hate to waste money on a set of solid lifters...

 

Welcome to the wonderful world of engine building.

 

Heyyou I right on this one, althoguh math can get you there as well, the decimal runoff can create machining imperfection. claying will give u a physical measurable garantee of p2v clearance so you know exactly what you have to do.

Engine building is no joke. But has an amazing way of making it all worth it in the end.

 

p2v has already been measure by claying the previous +.030 kb356 pistons that supposedely had the .085 elevated quench pad turned down .100... if this is truly the case (it sounds odd to me to not only eliminate the quench, but create a .015 difference b/w the quench pad and rest of the crown) lathing the new +.040 kb356 pistons would yield the same p2v clearance.

BUT i need to ask him if .100 is a typo of some sort...