350 Piston I.D. needed--What is 8557 or B557? - Chevelle Tech
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post #1 of 12 (permalink) Old Feb 23rd, 04, 9:55 PM Thread Starter
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Chris
 
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I purchased a complete running 4bolt 350.
I yanked the heads and pan off.
I saw flat tops with 4 valve reliefs and a small circle in the middle of them.They also have arrows facing forward.I think they are either stock pistops or cheap rebuilders.

I saw the part number on the skirt.It looked like either 8557 or B557.

Anyone know what it is and what the "Advertised" compression is with 67cc heads?

I brought the thing to top dead center and layed a feeler gauge on the piston and roughly figured the deck height at .055.
I'm probably going to run a Fel-Pro .015 shim gasket.
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post #2 of 12 (permalink) Old Feb 24th, 04, 12:02 AM
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I believe you are right. Sounds like a stock .020 destroked Badger 557

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post #3 of 12 (permalink) Old Feb 24th, 04, 12:43 AM Thread Starter
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Destroked pistons???

What the [img]graemlins/angry.gif[/img] is that?
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post #4 of 12 (permalink) Old Feb 24th, 04, 12:50 AM
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That's what the rebuilder pistons that have the pin moved .020 are called

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post #5 of 12 (permalink) Old Feb 24th, 04, 12:52 AM Thread Starter
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So they lose a little cubes AND compression
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post #6 of 12 (permalink) Old Feb 24th, 04, 1:02 AM
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No, this is just how they are described in the catalogs.
I don't have a clue why I guess it was someones idea of an easy way to tell you the pin was moved without simply saying the pin is moved up .020.
It is a 350 piston with the pin moved up just as they do in "stroker pistons" only some bright spark in advertising or what ever decided to give them a 'cute" name?
Why are we even discussing this, it's a piston with horrible quench with a stupid name designed to be put in a block that may have been decked.

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post #7 of 12 (permalink) Old Feb 24th, 04, 1:15 AM Thread Starter
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yea I know and ouch

I was planning on running this engine a little.
My friend told me it was a 350 4bolt with flat top's.

I thought I could find what the piston is ( ) and compute the compression and slap an appropriate stick in it.

I have looked online for this piston but I can't find any info.

I know this hurts (it hurts me more than you because I now own the damn thing ) but
could you help me figure what the compression might be?
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post #8 of 12 (permalink) Old Feb 24th, 04, 1:31 AM
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Hey, all is not lost
You can get it to a smokin 8.4 with a .015 1094 felpro & 76cc heads or better, 9.5 with some 64cc vortecs
This is assuming they are really .055 down which is .010 further than they should be unless the rods got "destroked" .010 when they were done too

======EDIT============
9.2 with 67cc's

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post #9 of 12 (permalink) Old Feb 24th, 04, 1:38 AM Thread Starter
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Quote:
Originally posted by Wolfplace:
Hey, all is not lost
======EDIT============
9.2 with 67cc's
Uh... yea 9.2

Someone just shoot me [img]graemlins/clonk.gif[/img]

Gee I might get away with sticking an RV cam in it [img]graemlins/sad.gif[/img] [img]graemlins/boring.gif[/img]
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post #10 of 12 (permalink) Old Feb 24th, 04, 1:46 AM Thread Starter
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Just a thought do you know of a cam that would work well with 9,2:1

World S/R Torkers 202/160 very mild bowl port,1 5/8 headers,RPM Manifold,

3.42's, th-350,2400 stall,and 3400 pounds???

May have to get me one of those Comp XE grinds.
Humm maby the
XE262H- 262 270 218 224 462 469 110
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post #11 of 12 (permalink) Old Feb 24th, 04, 10:26 PM Thread Starter
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Uh... Well...Someone did shoot me.

I rechecked the deck height after cleaning off some carbon and gasket material on the block and heads.

The result... .060 WTF!!!

It looks like the Fel-Pro .015 will bring my quench to a real sweet .075 [img]tongue.gif[/img]

It looks like I bought a rebuilder 350 4bolt with crank,rods,water pump,pulleys, and valve covers.

But hey at least it's a 4bolt with high nickel and high tin, it's also standard bore.
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post #12 of 12 (permalink) Old Feb 25th, 04, 8:21 AM
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Don't feel bad. The engine in my truck has 9.4-1 with vortec heads, .040 deck height, and .038 head gaskets. Yeah, thats right...078 deck height But, I built the shortblock back before I knew much about quench. I use an XE268 (which would work great in your application BTW). I get 180psi cranking compression, run on 89 octane (87 in a pinch), and can burn the tires off of it from a 15mph roll with 3.08 gears and a 2000 stall convertor. It's not perfect, but it gets the job done.

'86 chevy 3/4 ton...9.4-1 355, vortec heads, vortec performer intake, 600 edelbrock, xe268, headers, duals w/turbo mufflers, BTO 700R4, 3.23 gears

'77 nova, 388, 200cc pro-toplines, holley 300-36, 750 edelbrock, comp 294s, 10" ATI, 3.73's

'83 ford F-150 XLT...351w, C-6 and 3.55's.
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