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Old 04-17-2013, 12:30 PM
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pontiac #62 heads on 350

Hi folks,

I have an opportunity to buy some freshly rebuilt pontiac #62 heads to replace my really old and tired stock 7H1 heads on my 1972 pontiac 350.

would this be a wise choice?

Thanks

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Old 04-17-2013, 12:42 PM
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The #62 Pontiac head is a high compression head and work would need to be done to the guides, (if they are stock) to run on unleaded fuel that we have today...I'm interested in hearing what people have to say with respect to this head on a 68 350 Pontiac, no doubt valve shrouding will come into play as well.

Ray
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Old 04-17-2013, 01:18 PM
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The #62 Pontiac heads are among the best 1965-1979 Pontiac heads but you should not waste them on a 350 CI engine. The bore/stroke ratio of a 350 CI engine is terrible and the block cannot be bored enough to take advantage of the #62 heads that were designed for 400 CI engines. Good 400 CI engines are still available with some diligent searching. A 400 CI engine will fit anything that a 350 CI engine will fit.

The installation of K-line (or equal) phosphor-bronze valve guide liners, reducing the valve stem clearances to .0015" I and .002" E , accompanied by the installation of Viton positive stop valve seals is a good high performance modification. Discard the valve shields and O-ring seals, if they have not already been tossed in the trash. That work should be included on all good valve jobs. Porting and flow testing is not necessary with those heads and that work is just a gold mine for machine shops. The #62 heads flow well enough for a high performance street machine with a 3-angle valve job.
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Old 04-17-2013, 01:43 PM
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unfortunatley i dont have the money to take these heads to a machine shop. the block is a 1972 pontiac 350. If i were to install these #62 heads as is on the 1972 pontiac 350 motor what would happen?

Thanks
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Old 04-17-2013, 02:10 PM
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Nothing would happen.
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Old 04-17-2013, 02:25 PM
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I guess what i mean is if there would be a detrement to the motor, would it run badly etc? would i run into any problems?
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Old 04-17-2013, 02:32 PM
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If the heads are in good condition meaning, not cracked, no bad valves, no bad seats, no bad valve guides, no bad valve springs, and not warped, the engine will run the same or slightly than before..... if you install the heads correctly. The #62 heads have larger valves than the original heads used on the 350 CI engine. But you will not feel any difference in performance with the 350 CI engine.
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Old 04-17-2013, 03:42 PM
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will i be able to utilize the same pushrods?
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Old 04-17-2013, 04:04 PM
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Yes, you can use your old push rods if they are in good condition. All 1967-1979 Pontiac regular production engines use the same push rods, rocker arms and valve springs. 1967-1979 Pontiac GM push rods are 9.145" long. Aftermarket push rods may vary +/- .010" .
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Old 04-17-2013, 06:28 PM
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The larger 2.11 intake valves will be shrouded by the small bore of the 350.
You will notice chamfers at the top of the block for valve unshrouding, on the 1972 block you have.
The heads also dont have hardened seats for unleaded fuels.
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Old 04-17-2013, 07:04 PM
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Something to keep in mind though Starin, these are still desirable heads and one day, probably not to long from now, that 350 isn't going to be putting out the power that you want and a good deal on a 400 is going to come along...if you can get these heads at a reasonable price, it may be worth getting them, for that day that the 400 falls into your lap...along with a few extra dollars...hopefully.

Ray
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Old 04-17-2013, 09:04 PM
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Not the best fit

They will work fine for a while..... However they are the older style heads and don't have the hardened valve seats that are present in the 6x heads and such. So over time the valves will bore into the head.

Your performance upgrade will be marginal as others have mentioned about you having to small a bore to exploit the 2.11 intake valves.

I'm not sure its worth your trouble unless your heads you are running now are in awful shape.
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Old 04-18-2013, 12:31 PM
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i'll probably pick up the heads since they are going for $225 for the pair supposedly rebuilt and look clean in the pic.
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Old 04-18-2013, 01:28 PM
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Those heads will work on a 350. Like MouseFink says, you are wasting them on a 350. You should see a increase in power, the compresson ratio will increase. Slap them on if that's what you want. It will proabably take a long time before unleaded fuel gets the valve seats. Hobby cars don't get driven enough to worry about it, it could take years before something happens.
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Old 04-18-2013, 01:42 PM
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The accessory mounting hole for the alternator on '71-later cars is not "there" on the 62s. A bracket will have to be fashioned.

There's a pic of it in Jim Hand's book.

Jim
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