#5 Olds Heads Machine Question for a 403 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-13-2010, 10:43 AM
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#5 Olds Heads Machine Question for a 403

I just got a set of #5 heads from the local pull and save out of a '68 Cutlass. I took them to the machine shop and was wondering if there was any special instructions to give them other than the 1/2" bolt holes and hardened seats? I've read the #5 were the best flowing and don't need much. Just wondering what other people have done.

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Old 05-13-2010, 12:28 PM
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I have read- NOT done it yet myself- that the 2.00"/1.625" valves work real well in those heads on the 403. The valve stem diameter is .341" and overall length is 4.740".

Depending on what rocker arms and cam you're going to use, this could be an opportune time to get the valves 0.100" longer than stock.

I wouldn't bother w/hardened seats, YMMV. You can get like 60K miles from unhardened seats, w/o problem- but if you plan on a lot of driving...

Be sure the shop is up to speed on the Olds seats- they shouldn't be as "deep" as most seats are for the SBC, or you'll be into the water jacket.

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Old 05-13-2010, 12:55 PM
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Quote:
Originally Posted by cobalt327
I have read- NOT done it yet myself- that the 2.00"/1.625" valves work real well in those heads on the 403. The valve stem diameter is .341" and overall length is 4.740".

Depending on what rocker arms and cam you're going to use, this could be an opportune time to get the valves 0.100" longer than stock.

I wouldn't bother w/hardened seats, YMMV. You can get like 60K miles from unhardened seats, w/o problem- but if you plan on a lot of driving...

Be sure the shop is up to speed on the Olds seats- they shouldn't be as "deep" as most seats are for the SBC, or you'll be into the water jacket.
All good advice. The 2.000/1.625 valves were what the factory put in those heads on the 68-69 W-31 cars. Also, I'll echo the comment about the seats. Machining for the common SBC seats WILL hit water. Finally, the shop must be careful about setting the valve stem height if you're using stock, non-adjustable rockers. Most Chevy-centric shops do not realize this.
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Old 05-13-2010, 11:19 PM
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Thank to both replys. Do you suggest Comp Cams roller tip rockers or is it not worth the money? Also any cam grind suggestions? I will likely keep the bottom end stock with headers. Maybe a girdle. Since it's a '79 T/A I'm stuck with a stock or performer intake if I want the shaker to actually shake. I really appreciate the info. Thanks to all.

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Old 05-14-2010, 02:05 PM
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Other than a correct ratio, the roller tip rockers are nothing special. I'd not bother, instead get an adjustable rocker arm set-up installed. That way the valve train can have the correct geometry by using the correct push rod length- something you can't do w/a non-adjustable OEM valve train- and it will have the correct lifter preload or lash.

A couple places for info:
BOP Engineering
Pro-formance Unlimited
Doug Herbert
Olds Wiki
442 forum
Classic Olds site
Dick Miller
Oldsmobile Forum
Realoldspower

Last edited by cobalt327; 05-14-2010 at 02:09 PM. Reason: Add link.
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