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Old 08-31-2008, 03:31 PM
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Engine rebuild questions - SBC - Central MD

I got the engine out and apart this weekend. As a refresher, this is the motor out of my Cutlass that recently experienced a sudden and catastrophic loss of oil pressure. It ran when I took it apart, but confidence in it is nil.

The previous owner had a cam disintegrate on him and I knew that. I was gambling that I would be able to replace the cam and lifters and run with it. It didn't work out. I had a lot of metal in the oil. At first I thought it might have been the new cam self destructing, since this was the first cam install I've done. But I pulled it and the lifters, and everything looks good.

Here is what I am working with:
3970010 block - .030 over
14014416 heads - 58cc, stock valves (1.84 and 1.5) I plan to do a mild port and polish job on them.
Sealed Power 2256 pistons (dished, -6.1cc)
Edelbrock Performer Air Gap intake
Edelbrock 1411 750cfm carb
Headers with true duals, hi-flow cats and 3-chamber flowmasters
Currently has a Summit 1106 cam in it (234@.050, .488 lift, 114LSA)
TH350 trans

So, my goal is 350-400HP at the flywheel. Is this attainable with this setup? I also want it to run on pump gas. It will be a cruiser only, no real drag time.

So, my questions:

I calculate the current CR at about 11:1 with a .020 head gasket. To get a more streetable CR, I'm thinking about going to a .040 (10.5:1), or even a .060 (10:1) head gasket. Any issues with this, and my power goals?

Clearly I need a good rebuild book, and I have Vizard's on the way. In the meantime, should my rods have any side-to-side movement on the crank journal? At least a couple do.

If when I pull the pistons I find them to be ok, is there any value in replacing them? If there are no broken skirts and the ring grooves look ok.

What is the best way to get all the metal and stuff out of the inside of the engine? I'm on a budget, so I'm trying to minimize machine shop time.

How can I tell if I need to have the crank ground? What level of roughness is acceptable? Finger nail feelable? Or should it seem perfectly smooth?

Any opinions on the Summit rebuild kits? They are significantly more complete, and less expensive than anything else I've found.

Finally, does anyone have suggestions for a good machine shop in the Frederick, MD area?


thanks

stu...

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Last edited by CuttyGMachine; 08-31-2008 at 03:53 PM.
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Old 08-31-2008, 03:59 PM
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When you get it all apart, clean everything with hot soapy water and a brush and flush it off, dry it and spray with LPS 1 or 2. If you are going to paint the block, don't spray it, it will need washed again.
The oil galleries should be cleaned out with rifle barrel brushes, but there shouldn't be any metal in there since the oil went through the filter first.

Measure everything. That metal didn't do anything any good.
The pistons might have collapsed skirts. Probably need a machine shop to measure them.

If the crank journals look and feel smooth, new bearings will probably do the deed if checked for clearance.

Head gasket thickness should be determined by piston to head clearance. Shoot for .040-.050. More clearance increases detonation tendencies which usually offsets any value of compression decrease.

I would study the threads about "head grooving" on this forum, and contact automotivebreath.

Of course, oil pump and all bearings must be replaced... including cam bearings. I would consider a new cam and new lifters. I would insist on a LSA of 108 to 110* for better performance and keep the duration down to about 220 (to 224* maximum), I prefer a single pattern cam for better mid range power. I like the Comp 268H.

JMHO

Last edited by ScoTFrenzel; 08-31-2008 at 04:05 PM.
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Old 08-31-2008, 04:29 PM
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Quote:
Originally Posted by CuttyGMachine

recently experienced a sudden and catastrophic loss of oil pressure.

The previous owner had a cam disintegrate on him.

I had a lot of metal in the oil.



stu...
Those three things tell me you really need to enlist the help of a good shop! Something went really wrong to loose all oil pressure. A shreading cam will toss metal everywere, as you see in the oil. It gets tossed up onto piston skirts and will get embedded in the pistons and cylinder walls will get scratched. Crank is probably in need of at a minimum, polishing. All the bearings are shot too as is the pump, cam and lifters.
Most don't realize how much damage a flat cam does. We all would like to think that the "filter got it all" but it just doesn't work that way.
Bite the bullet and spend the bucks to do it right. Trying to reach 400hp is not cheap and can't be done with marginal parts.Your machinist will guide you in your parts selection to achieve your goals. Personally, going to a .060 head gasket to lower compression is not a good idea. You need to better select your parts plan.

Mark
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Old 08-31-2008, 10:33 PM
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When in doubt take it to a machine shop. You cant see out of round in a cylinder or abnormal wear on a crank unless it is scored. You should have the cylinders and crank checked for wear. If you want to see 400 hp, get better heads. The valves in your heads are not going to keep up with the rest of the engine. You have a good cam, but air flow is restricted by the valves. If you want to keep the heads, see if you can enlarge the valve seats and install 2.02 intakes and 1.60 exhaust. It would probably be cheaper to find a decent set of heads that already have the big valves.
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Old 07-08-2009, 12:32 AM
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hey, I was wondering how your engine turned out and the amount of power it made.
because i am also building another 350 with the 305 416 heads and the summit 1105 cam and wanted to know how it all turned out and how much compression you had and so on.
so if your still around I would really appreciate the info,
thanks, Mike
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Old 07-17-2009, 11:22 AM
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305

whats the max valve lift on a 305 non HO?
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Old 07-17-2009, 11:34 AM
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Quote:
Originally Posted by CuttyGMachine
Finally, does anyone have suggestions for a good machine shop in the Frederick, MD area?
Well, I sent you a PM on this before I read the date of your post, lol. Didn't notice the grave digging on the post...

Sorry! Disregard
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