Oil out of sidepipe.

[mdbelanger]

Half a mile from home I stompped on her and ball of blue smoke beside me.
Drivers sidepipe soaked inside with oil.

Pulled plugs on drivers side. These have over 4000 miles on them. #3 heavy in oil.

This motor is a 385 Fast Burn. On the road in October of 2007, have put 17,000 miles on her.

Looken for thoughts on how deep I am going to end-up on diggen.

Michael.

 

[Belgian1979vette]

I would check the valve stem seals first before any disassembly.

 

[MYBAD79]

agree.... most likely valve stem seals.... should last longer than 17K miles though.... h:

 

[Twin_Turbo]

Does it smoke blue after startup??? (seals)

If you run on the highway and coast and then stomp it does it smoke blue then?? (rings)

Could also be an intake gasket

 

[mdbelanger]

Did a compression test a few hours ago. # 1,5,7,2,4,6,8 all reading at 175 to 182 psi. #3 25 psi made my balls climb up to the back of my throat.

Pulled the head now setting up to pull the motor.

10 o'clock is missing an edge of piston.

Need some feed-back folks.
Think this head is salvageable?
Guess while I am in her this deep some porting and polishing will be done.
Getting ready to order new pistons and rings, any sugestions on what could improve this 385 Fast Burn?

Michael.

Please move to "engine mods" due to I see a few comming?

 

[BBShark]

I moved it and left a redirect to it.

What does the cylinder wall look like?

 

[mdbelanger]

What does the cylinder wall look like?

Very light scratch, most likely one or two passes of the hone and you'll never know what happened.

 

[Twin_Turbo]

Ring land breaking off, that's detonation damage.

alu fast burn heads? those can easily be repaired by a good shop, no problem.

 

[MYBAD79]

if it's detonation, why only one cylinder ?

looks like the piton next to it (#5) is damaged too, or is it the picture ??

 

[mdbelanger]

Its the picture I'll get more when it stops raining.

 

[mrvette]

Oh man, what a shame, I bought a set of aluminum heads with that kind of damage on them, head shop fixed them right up, not an issue not even broken....wish I could say the same for your piston there, you could always try some JBWeld....:stirpot:

then again, maybe NOT....sorry to see that man....

:crutches:

 

[Twin_Turbo]

if it's detonation, why only one cylinder ?

looks like the piton next to it (#5) is damaged too, or is it the picture ??

One cylinder will fail first won't it? Honestly, that is typical detonation damage. I doubt it's too small a top ring gap in case these are hypers. You'd see marks on the cylinder wall for sure. This kind of failure is the result of an overheated piston crown.

 

[Worship79]

Auch! Good luck, must still hurt just looking at the pictures :amazed:

 

[mdbelanger]

Ok Folks back home for awhile.

Pulled the other head awhile ago and cleaned em up a bit to get some better pics.
I seam to rember a Piston Co. that showed all sorts or piston damage. I can't find the site anymore. I recall that what I'll call "Pin prick marks" is a sign of Detonation.

These pics are in the order of 2, 4, 6, 8, 1, 3, 5, 7.

Now to pull the block.

Michael.

 

[CNC BLOCKS]

Its the picture I'll get more when it stops raining.

Your not very far from me, Hang onto your ass when you get a new piston from GM and if you change the insert have the rod checked for size as we just rebuilt a crate engine and the rods were .2.2240 and we machined them to 2.2252 to get our required clearance.

The spec on that rod is 2.2247 to 2.2252

May want to spray some break clean in the intake and exhaust ports to make sure there is no seat damage.

Good luck with your build Carl

 

[mdbelanger]

Now its time to start thinken of what to order.

This Vette is for the street and hauling Deer.

The specs on the GM 385 Fast Burn:

Fast Burn 385 Tech Specs Block Part Number:
10105123

Block Type:
Cast iron with 4-bolt main caps

Bore x stroke (in):
4.00 x 3.48

Camshaft duration (@.050 in):
208 degree intake / 221 degree exhaust

Camshaft lift (in):
.474 intake / .510 exhaust

Camshaft Part Number:
10185071

Camshaft type:
Hydraulic roller

Compression ratio:
9.6:1

Connecting Rod Part Number:
10108688

Connecting rods Type:
Powdered metal steel

Crankshaft Part Number:
12556307

Crankshaft Type:
Forged steel

Cylinder head Part Number:
12464298

Cylinder head Type:
Fast Burn aluminum; 62cc chambers

Displacement (cu in):
350

Engine Name:
Fast Burn 385:

Engine type:
Chevy small-block V-8

Ignition timing:
32 degree total @ 4000 rpm with vacuum advance disconnected

Maximum rpm:
5800

NOTE:
Distributor with melonized steel gear MUST be used with long blocks and partial engines with steel camshafts, or engine damage will occur.

Piston Part Number:
10159436

Pistons Type:
Hypereutectic aluminum

Recommended fuel:
92 octane

Rocker arm ratio:
1.5:1

Rocker arms Part Number:
10089648

Rocker arms Type:
stamped steel

Valve size (in):
2.00 intake / 1.55 exhaust

Gm Dyno Chart:

I would like to get a tad bit more out of this motor if possible.

Heads specs say I can mill .060 of an inch off. I believe .030 will be enough, "so that I can do this again".

Head gasket calls for: Stainless fire rings, .051" compressed.

As for new pistons, open to all sugestons and why.

All help is appreciated.

 

[Twin_Turbo]

Get a thinner gasket, it will be more detonation resistant. .051 _ piston down hole gives you 0 quench effect.

Flat top hypers will be fine.