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Old 02-08-2005, 05:34 PM
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Unshrouding 2.02s

I've got a set of ported 462 heads that have been languishing in the basement. They've got 2.02 valves, but appear to have been opened from original 1.94s.

I talked to my machinist today and he said that unshrouding the intakes could cause the chambers to crack. He said even the factory 2.02 unshrouded chambers were known to crack.

I have my doubts about this info, but I thought I'd check to see if anyone knows more about unshrouding and had it done.

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Old 02-08-2005, 05:36 PM
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Depends on what you are after. For a street driven engine that is thrashed just occasionally I would not bother with it. Give up a little hp for some piece of mind. There are much higher hp gains to be had elsewhere IMO.

Vince
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Old 02-09-2005, 07:38 AM
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No one's had unshrouding done?
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Old 02-09-2005, 08:20 AM
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In David Vizards book, he points out where in the chamber there likely to crack after unshrouding is done, directly across from the large water port close to the chamber. he says that the 041 and 186 casting are bad about this.
other info I have says the factory originally used a 2.40 inch cutter in heads with 2.02 valves, later they reduced it to 2.34 with what they say was no effect on airflow. Hope this helps.
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Old 02-09-2005, 10:49 AM
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heads

I have only wasted money on stock cast iron heads once. Luckily I was able to sell them and retrieve 3/4s of my money.

It seems you have spent a fair amount on these heads already. You have new seats, valves, porting, and guides. Possibly springs, shims, and planing. Now you are going to spend on shrouding.

Go directly to aftermarket aluminum. Do not pass stock cast iron. Do not collect inferior parts.
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Old 02-09-2005, 11:59 AM
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Bought heads all redone for $250.

It's not wasted money if you're going for originality.
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Old 02-09-2005, 12:41 PM
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originality

Machined heads are not original equipment. Guess it depends on what you consider original. You could paint aluminum heads orange.
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Old 02-09-2005, 05:20 PM
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Don't see many camelback aftermarket heads anymore...
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