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Old 01-18-2008, 07:15 PM
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462624 head info

Iknow these heads are not the greatest.I am stuck with them. They have 1.72/1.50 valves.If I were to have 2.02 valves installed would they be good enough to handle 350 hp.If so I also have been told they are thin castings.I need them to be shaved to about 70cc to get desired compresion is this safe.

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Old 01-18-2008, 07:29 PM
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You are correct about these being thin castings. Quite a few of these I have seen come thorough the shop are cracked in the exhaust seats. Since your heads currently have 1.72 intake valves, I don't think you will have success upsizing to 2.02. I can't say for sure since I have never put bigger valves in these heads than what they came with from the factory.
There are much better heads out there that would work better for your goals. I would look around and see what you can find. Even 882's would be better than the 624's.
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Old 01-18-2008, 07:32 PM
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624 casting are probably the worst of the gm light weight castings for cracking. These are THIN they crack across the exhaust seats and thru to the heat crossover. They will not tolerate much decking either.

I would find some better heads to start with. Even 882's are better.
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Old 01-18-2008, 08:08 PM
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Boat anchors.
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Old 01-18-2008, 08:53 PM
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The only pair of these I ever saw that didnt have cracks in middle two exhaust seats were from a Corvette they had 2.02 / 1.6 valves. The more you mill them the worse the sealing area gets near spark plug.

I would look at aftermarket heads because they come with all the benefits like large valves, harded exh seats, good flow, heavy duty casting, machined for screw in studs. All the good stuff you want & none of the anguish of trying to find someone you trust and shelling out money to do performance work.
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Old 01-18-2008, 10:11 PM
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for the cost of buying big valves and having the valve job done you could buy a set of used vortecs
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