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  #31 (permalink)  
Old 05-26-2011, 07:16 PM
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Again im sorry everyone for the wierd out burst of qeustions i had. Im just so ecstatic now i have the block, hard to find i geuss, but i could be wrong. Its the project worth waiting for, if i look at the picture right on. Im just glad i got it. I have an idea for some heads, but imma have at look at these used 2.02 and 1.60 valves in these junk casting 462624 heads of mine. Whatcha think? Could i reuse valves if virgin?

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  #32 (permalink)  
Old 05-26-2011, 07:35 PM
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Quote:
Originally Posted by chevy302builder18
I have an idea for some heads, but imma have at look at these used 2.02 and 1.60 valves in these junk casting 462624 heads of mine. Whatcha think? Could i reuse valves if virgin?
As long as the stem OD is OK, the valves aren't too beat up on their tips to be resurfaced and there's enough margin left after the 45 seat is recut, there's nothing wrong w/reusing valves.

They will be the stock length (if original) so might not be long enough for use w/some aftermarket cams that requires a valve spring w/a taller spring installed height than 1.7". There are retainers and/or locks that can add installed height to a spring when using stock length valves, but the retainer to rocker arm clearance will need to be checked closely.
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  #33 (permalink)  
Old 05-26-2011, 11:49 PM
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o ok i see. Well thats out of the qeustion, but whats the stock length of these? I dont wanna just throw these out, with out taking measurements. Ill just sample one.
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  #34 (permalink)  
Old 05-27-2011, 12:16 AM
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Quote:
Originally Posted by chevy302builder18
o ok i see. Well thats out of the qeustion, but whats the stock length of these? I dont wanna just throw these out, with out taking measurements. Ill just sample one.
What's "out of the question"? The machining ops to the valves I mentioned are routine when a valve job is done.

The length and diameter can be found by doing a search. Or if you were to measure the installed height of one of the springs, that can tell you what length the valves are. A stock length valve in a production SBC head would be expected to have a 1.7" spring installed height. The length of a "long" valve usually increases by 0.100", so the IH would be 1.8" or so, depending on the shims used (if any) and whether the retainer and locks were stock dimensions or not. Otherwise use the published figures to determine the length.
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  #35 (permalink)  
Old 05-27-2011, 12:48 AM
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i didnt mean it to sound like i didnt want to do the idea, since you said the factory ones werent usually used with big cams, im planning on doing a big lobe. Ill buy a micrometer, check the OD im geussing that is short for outside diameter?
Now i just reread what you said cobalt, and now i fully understand i can reuse them, to .500s of inch?

Last edited by chevy302builder18; 05-27-2011 at 12:59 AM. Reason: i just relized simple measurements and requirements
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  #36 (permalink)  
Old 05-28-2011, 01:15 PM
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Yea i told my dad what we were discussing and what i was planning on reusing these valves, i didnt even tell him what you said and it just surprised me he knew exactly what you just told me. Then i ask him how he knew, he was a boiler tech for the navy using valves and having them recut down to 45 degree angle. I forgot that he was, and of coarse i was surprised on how much he knew about valves. Im a blonde in descise,
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  #37 (permalink)  
Old 05-28-2011, 01:46 PM
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Quote:
Originally Posted by chevy302builder18
i was surprised on how much he knew about valves.
Yeah, isn't it strange how those old guys come up with pearls of wisdom when you think they didn't have sense enough to come in out of the rain? He was cuttin' valves while you were still poopin' green.
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  #38 (permalink)  
Old 05-29-2011, 01:55 AM
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yea i was wanting you guys to have a look to. Im sorry you guys are right about me. im wanting to learn now. Tell me whatcha think. I could post other ones too. Are these factory pistons, or was this rebuilt?
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  #39 (permalink)  
Old 05-29-2011, 02:40 AM
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Quote:
Originally Posted by chevy302builder18
Are these factory pistons, or was this rebuilt?
I'd say they were replacements. Are there any markings on the tops, like 030 or anything like that?

In any event, these are either some DEEP dishes or shallow valve reliefs, and to add to that, you really want a D-shaped dish or "reverse dome"-type dish. Because of their design (talking about the D-shaped dish or reverse dome), the quench effect is retained wholly or in large part, whereas w/the round dish like you have and the OEM pistons shown have, the quench effect is mostly lost.

Below are a couple OEM pistons from a 350, the 400 pistons resemble these for the most part:




REVERSE DOME
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  #40 (permalink)  
Old 05-29-2011, 03:59 PM
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well i was surprised, the piston has an H and thats all i could find on any of em. Cleaned it up as good as possible
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  #41 (permalink)  
Old 05-29-2011, 09:57 PM
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hmmm i just wanna tell you, since the heads im looking at have a 64 cc chamber, that would be awsome for this application, what would be the CR on that?
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  #42 (permalink)  
Old 05-29-2011, 10:29 PM
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Quote:
Originally Posted by chevy302builder18
hmmm i just wanna tell you, since the heads im looking at have a 64 cc chamber, that would be awsome for this application, what would be the CR on that?
CR calculator- http://www.wheelspin.net/calc/calc2.html. Use the figures for your engine instead of what is in the calculator already.

The head gasket bore for a 400 varies, use 4.2".
Head Gasket Thickness varies, use 0.041".
Piston Dish Volume in CC's needs to be measured for the pistons you have. Do a search for CC'ing combustion chambers, the same process is used for a piston dish.
The Piston Deck Clearance of an undecked SBC block is 0.025" nominal. Often, builders will "zero deck" the block so the quench will be ideal w/a 0.041" head gasket.
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  #43 (permalink)  
Old 05-29-2011, 10:43 PM
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If you look through the thread- Pontiac 400 with #62 heads starting w/post #9, it will give you an idea of how to measure chamber and piston dish/dome volume.
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  #44 (permalink)  
Old 05-30-2011, 12:30 AM
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thanks cobalt !! Will do
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  #45 (permalink)  
Old 05-30-2011, 01:30 AM
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well i played with the calculator some, and i got these results. Bore- 4.125 stroke- 3.75 and added up all the numbers 0.041 gasket thickness, and 4.2 bore gasket -11 cc domes summit offers for $350 hypereutectic, the smallest ones i could find, those with a 64 cc chamber are 10.25 .1 or even possible 11.45.1. I did follow the suggested. I did find -15 cc dish would work fine at a 9.47.1
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