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Old 03-30-2006, 03:32 PM
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Breaking In A New Engine

Hello again. I'm about to fire up the new 350 chevy engine in a week or two and wanted the best advice I can get.

I have 10.5:1 compression
Comp Cam's Solid tappet cam 0.520/0.540 Dual spring with damper
Dart aluminum heads 64cc
Pete Jackson Gear drive

I hope some of you engine techs here can point me in the right direction

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Old 03-30-2006, 04:36 PM
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Hey Charlie, I seen the pics of your new motor on cheytruck world.I like them blue valve covors you have. I got a new motor allso. Im not of much help,the advice I was given was after I get it on the road,for now dont start it too much unessasarily. After its road worthy,I will drive it at various speeds,up the ramp to the gardner,up the dvp 60mph max. I will take it easy like that for around 200 miles. After 200 miles I think I will change the oil and filter. Thats how Im gonna do it,but Im going to listen to any good advice.
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Old 03-30-2006, 04:53 PM
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break cam in at 2000 rpm for 20 min, do not let it run hot, check for leaks,good oil pressure
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Old 03-30-2006, 05:31 PM
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Swap out the springs with some stockers for break-in or you'll be doin' the whole thing over again pretty quickly because of a wiped out cam.
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Old 03-30-2006, 05:43 PM
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Here are the basics:

1) Prelube engine until oil comes out all rockers, this is very important
2) Run a 10/40 or 20/50 non synthetic oil. The reason is these weight oils don't need to meet the low zinc regulations like a lower weight oil does. We break in all motors on NAPA 20/50. No issues at all.
3) Make sure the distributor is phased properly to #1 with a slight advance so it starts up right away. Extended cranking will wipe the cam lobes.
4) Fill the float bowls through the vents if needed and prime the engine with a few pump strokes of the accel pump. Need fuel to fire.
5) If possible remove the inner springs. It just raises the success percent running a lighter spring. We will use 1.3 or 1.4 break in rockers.
6) Set idle mix screws about 1.5 turns out. Make sure throttle blades are adjusted properly as well, per manufacturers specs.
7) When it fires bring RPM's to 2500 and keep it betwen 2000 and 3000 RPM for 20 minutes.
8) Verify oil pressure and it's a good idea to have a oil temp gauge as well.
9) Keep an eye on the water level in the radiator. Leave cap off and make sure it stays full, expecially after the thermostat opens.
10) Verify timing right after it fires. Make sure it is somewhat close to reasonable, at 3000 RPM it should be in the 32 - 38 range or so. If not loosen distributor and adjust, while the motor is still at break in revs. After it's broken in you can set base and confirm total.
11) After break in change oil, filter, inspect for silver or copper issues and install new.
13) Replace springs if you took out inners
12) Start motor and set carb idle and timing.

Go have fun and keep an eye on oil temps and water temps.
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Old 03-30-2006, 05:50 PM
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Doc here,

Pre lube the engine. Make sure the pressure is up and flowing at the lifters.

Be sure you have water, full oil, no leaks and monitor your gauge panel.

Run it at least 5 minutes at 2000 RPM , 20 would be better.

Drive it 500 miles 35, 45, 55, 65, and back down, not at a constant speed.

Change the oil and filter after 500, and inspect for any leaks.

Doc
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Old 03-30-2006, 11:44 PM
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Whats the best way of taking out the inner spring and damper spring, the heads are already on it
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Old 03-30-2006, 11:55 PM
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Manley valve spring compressor and shop air....
http://store.summitracing.com/egnsea...=KeywordSearch
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Old 03-31-2006, 05:08 AM
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Thanks one is in the mail now
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Old 03-31-2006, 05:39 AM
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Agrees with breaking in with lighter springs.........will save you lots of headaches
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Old 03-31-2006, 07:56 AM
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Good luck Charlie.
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