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Old 12-01-2009, 08:51 PM
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olds 403

i am rebuilding an olds 403 and am looking to see what people think of my build. The engine is out of a 79 trans am. The block was bored 0.24 over. oil restrictors in main saddles. moroso high volume oil pump and deep oil pan. I have a forged olds 330 crank with stock 403 rods and kb pistons. Main bearing holes were elongated to line up better with the feed holes. The entire assembly balanced. I also have a 4 cap girdle with stud kit tying the main caps together. i might make a piece that will attach the girdle to the 5th cap making in stronger. The cam is a custom ground hydraulic roller from comp. intake .528 exhaust .547. duration intake 248 and exhaust 254. lsa is 110. behive stiff valve springs. Hydraulic roller lifters. On top i have 72 #7 olds 350 heads with arp stud kit. There not milled but im hoping to get around 10.5:1 compression. im using copper head gasket. They were hand ported and polished. Installed the biggest stainless steel valves i could. comp magnum roller rockers and oil restricted pushrods. edelbrock 7111 port matched intake and holley 750 dp with choke tower machined for improved airflow. headers and msd ignition. I also have a electric fan for it. Engine will be hooked up to 700-r4 from monster transmissions and 3.73 rear gears. Im hoping for 500+ hp. Do you think i will meet my goal?

Last edited by dman0712; 12-02-2009 at 03:13 PM.
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Old 12-02-2009, 09:54 AM
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Quote:
Originally Posted by dman0712
i am rebuilding an olds 403 and am looking to see what people think of my build.
Sounds like a good solid build. I would be wary of the restrictors, however. Olds motors send oil to the lifter galleries first, then to the mains and finally to the cam bearings. These restrictors do virtually nothing to help keep oil out of the top end and frequently result in damaged cam bearings if the hole in the main bearing doesn't line up with the hole in the restrictor. The only effective restrictors for Olds motors are individual restrictors in each of the lifter oil feed holes.
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Old 12-02-2009, 03:11 PM
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i elongated the main bearing holes to line up better and with a hydraulic roller cam u dont want to restrict the hydraulic roller lifters. I have the oil restricting pushrods to keep less oil from reaching up top.
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Old 12-02-2009, 04:17 PM
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Quote:
Originally Posted by dman0712
I have the oil restricting pushrods to keep less oil from reaching up top.
Perfect. Sound like a nice build.
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Old 12-02-2009, 08:25 PM
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my only worry is i have the 64cc chamber heads and kb 0.24 over pistons. my compression is going to be around 11:1. i have a good headgasket and a large enough cam to work with the compression but i just dont know if the bottom end will handle it?
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Old 12-02-2009, 08:27 PM
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crank

i have the stock 403 crank and forged olds 330 crank. i was going to have the crank knife edged to lighten it but im not sure which crank to do this too. the forged crank is far heavier but i worry about the mains even with my girdle and the 403 crank could be much lighter. I need some answers
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Old 03-13-2010, 07:29 PM
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nice but i have a question?

do you know if a sb 350 cam will fit that 403 cause i have a ta and a spae cam lying around!
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Old 03-13-2010, 07:39 PM
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Quote:
Originally Posted by chevyboi65
do you know if a sb 350 cam will fit that 403 cause i have a ta and a spae cam lying around!
Oldsmobile flat tappet camshafts are interchangeable
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Old 03-14-2010, 05:36 PM
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Quote:
Originally Posted by chevyboi65
do you know if a sb 350 cam will fit that 403 cause i have a ta and a spae cam lying around!
If you are talking about a small block OLDSMOBILE 350, then yes, as noted above. If you are talking about a small block Chevy 350, then no as noted in your other thread.
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Old 03-14-2010, 06:25 PM
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Seriously, you had it bored .24 over?
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Old 03-15-2010, 07:36 AM
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Quote:
Originally Posted by DENCOUCH
Seriously, you had it bored .24 over?
Thats what I was thinking.
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Old 04-09-2010, 11:58 AM
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yes it was bored 0.24 over. that was the piston size and it wasnt reccomended to bore over .30 becasue of cooling issues.
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Old 04-09-2010, 04:04 PM
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Quote:
Originally Posted by dman0712
yes it was bored 0.24 over. that was the piston size and it wasnt reccomended to bore over .30 becasue of cooling issues.
I've got to believe he is trying to say it was bored .024". There wouldn't be any cylinders left if he bored it .240!!! Sounds like an odd over-bore to me?
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Old 04-09-2010, 05:30 PM
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Maybe he had the block resleeved, and then bored .24?
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Old 04-10-2010, 07:53 AM
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Quote:
Originally Posted by DENCOUCH
Maybe he had the block resleeved, and then bored .24?
Do you really think that there is enough cast iron between the cylinders that would allow you to do that? It has been a while since I have seen an Olds 403 engine block so I am going from memory but I still don't think you could go that big on the over-bore. Maybe someone with current machine shop experience will comment.

Last edited by The Factory Man; 04-10-2010 at 08:01 AM.
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