Freshly Rebuilt sbc 355 cranks over hard - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-09-2009, 05:04 PM
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Freshly Rebuilt sbc 355 cranks over hard

hey guys, i just built my first engine. It's a 1989 chevy 2-bolt main block bored .030 over. It's got a 9.7:1 compression ration and i put on new cast iron heads w/ 64cc chambers, new bearings, machined crank, rods, etc. It's all been put into a short bed 1985 S10. I put everything together, checking clearances and everything very carefully with the use of a information book on building small block chevys. I primed the oil pump before starting the engine. I just started the engine for the first time last week and it cranked right over easily when i jumped it with my jeep wrangler, putting out 14v or so when it's running. It ran, although we had to restart it a few times to get the timing right. Now when I've tried to start it up recently (maybe the 5th time or so, it started cranking over hard. Is this because the rings and valves have broken in and become fully seated and sealed and made it much higher compression? Do engines with a higher compression ratio like this usually take more volts or amps to crank over than a normal battery/alternator can dish out? Im kind of worried because it basically barely cranks over, im lucky to be able to crank it over one or two times, although that usually does start it up eventually if i take pauses in between cranks.

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Old 02-09-2009, 05:16 PM
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My guess it the timing is to far advanced. Pull the wire to your coil and crank it over. I bet it will turn over fine with no spark.
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Old 02-09-2009, 05:17 PM
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You may want to check your timing. Put it back where you had in on initial start and go from there.
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Old 02-09-2009, 05:20 PM
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Well the thing is it purrs like a kitten when started. I'll give that a try though. thanks
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Old 02-09-2009, 05:49 PM
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My 67 Camaro liked that advanced timing too, but it was cranking over so hard I started breaking starters.

Easy enough to test though. Let us know what you find.
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Old 02-09-2009, 06:22 PM
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Check your battery and grounds. these things cause all kinds of grief.
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Old 02-09-2009, 06:38 PM
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Quote:
Originally Posted by weirdbeard
My guess it the timing is to far advanced. Pull the wire to your coil and crank it over. I bet it will turn over fine with no spark.
i agree with weirdbeard on this my 408 acted the same way.oh just wondering what distributer are you running. nice 67 weirdbeard i have one to.
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Old 02-09-2009, 07:43 PM
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I'll probably catch some grief for this, but I have a motor that likes a lot of timing also. I just have an ignition kill switch. I kill the ignition, start cranking, and flip it back on. I've tried all kinds of things short of a super starter. The old girl doesn't deserve that kind of money. If I retard the timing to where it will start, it just falls on it's face.

Kevin
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Old 02-09-2009, 07:52 PM
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Quote:
Originally Posted by KA67_72
I'll probably catch some grief for this, but I have a motor that likes a lot of timing also. I just have an ignition kill switch. I kill the ignition, start cranking, and flip it back on. I've tried all kinds of things short of a super starter. The old girl doesn't deserve that kind of money. If I retard the timing to where it will start, it just falls on it's face.

Kevin
I do the spark kill switch thing also. (locked out full timing with a big cam) Works fine.. Make sure you have the OEM GM rear starter bracket/brace installed to support the heavy GM starter motor.
With this brace and the correct GM knurled shank starter mounting bolts you should not break the starter nose.
Leave the OEM starter bracket/brace off and you are just asking for a busted starter or stripped starter mounting bolt holes in the engien block.

You'll have to test the condition of your starter motor, starter solenoid and battery cables.
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