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Old 05-27-2002, 10:24 AM
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Unhappy engine identification olds motor

I've purchased a 1980 Camaro that has had a heart transplant. My question is what heart. I've got casting numbers but no answers locally. The engine cast no is 557265 4B, the intake cast is 411990 D5CE and the head casts are 717 255. The cylinders are bored to about the same as a 403 but I'm not certain. If its either, its a keeper but I lost compression on 1,5,and 7 cylinders and am still looking for cause Possibly cam? not sure.

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Old 05-27-2002, 05:48 PM
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all olds except the 455 had the same stroke, if the bore is 4.351" then it's a 403 unless somebody made a stroker (I doubt it) You maybe able to tell what it is by looking on the block just under the center 2 exaust ports. My 350 has 350 printed on each side (if I rember right) of the block. I assume others would also have a mark, but have only built the one, so cant promise.

Olds engines make a lot of torque at low rpms, are heaver than sbc's. If you keep the rocket, consider welding a seperator betweene the center exaust ports to improve exauste scavanging when running headers.

[ May 27, 2002: Message edited by: jeff of nc ]</p>
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Old 05-27-2002, 07:42 PM
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Thanks Jeff from NC I'm going to check that right now. Still am unable to remove lifters though. Buddy to me today that the lifters have a tendancy to wear to the cam. Possibly why the hard removal. Still chugging along. Transplant.
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