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Old 05-04-2004, 07:04 PM
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Hump heads / GM serpintine kit

i have a set of 3917291 castings, with 2.02 valves, 68cc chambers fully ported. im thinking about putting them on my 355 in place of some 1.94 mexico castings.
i am however concerned with the lack of accessory holes, does anyone have any opinions on drilling and tapping them? seems like theres enough meat for all but one.

and on a side note.. does anyone have experience with the GM serpintine belt kit for SBC's? im sick of listening to my v-belt squeal when i use the a/c.

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Old 05-04-2004, 07:07 PM
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Drilling and tapping them won't work. You will drill into water, and even if you sealed off the leak, you don't have enough material to hold any kind of bolt torque and on top of that the 291 heads are not machined flat on the side like a later style accessory bolt hole head. Just get the right brackets to use the 291 heads, it isn't that big of a deal. Only twelve catrillion small chevys have been done this way.
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Old 05-04-2004, 08:39 PM
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I got a set of pulleys from an 85/86 gmc van for my car for the same reason you stated. I also used the 291 heads like yours for a long time. Check these guys out if you want some brackets to mount tha alt. and compressor. The price is cheap and the brackets are well made.
http://www.alangrovecomponents.com/Catalog.htm

Larry
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Old 05-04-2004, 09:03 PM
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those brackets do look good for the price, but they mount everything real far and wide.. which may cause issues (has to fit in an 87 monte carlo)
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Old 05-04-2004, 09:46 PM
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Why not get a card-board cut-out, get some 1/4 steel and cut out the bracket w/ a plasma and a welding shop would do that dirt cheap if you had it already planned out and everything. This is what im doing for my power steering bracket.

-Eric
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Old 05-04-2004, 10:04 PM
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i put serpentine belts on my first dirt car...
we had trouble keeping belts on it.
i had to get new old stock 80 1 ton chevy truck pulleys. they fit into my 74 monte just fine, (old montes are big up front). but they old monte is only 4 inches wider than your metric monte (78 & up)

it should all fit great, they pulleys and brackets cost about 120 from a GM dealer. i could not find much at the yards.

good luck,

31
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Old 05-04-2004, 10:05 PM
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Quote:
Originally posted by crash70rs
those brackets do look good for the price, but they mount everything real far and wide.. which may cause issues (has to fit in an 87 monte carlo)
They sell separate brackets to get what you need done. I think P.N. 219-ALT would work for the alternator. It basically provides a rear mounting hole for the heads like ours without accessory holes made in them. P.N. 119L-AC would work for the ac compressor. Not too high or wide. It may take some fudging with to make it work with the factory compressor though. The brackets they sell are for Sanden 508, 510, and 709 compressors.

Larry
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Old 05-05-2004, 10:55 AM
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I was hoping for an easy way out.. but that of course never comes. Im gonna look into some serpentine pulley sets, then maybe fabricate brackets to work, since i do have full machine shop access.
the only tyhing im worried about is the a/c compressor. any suggestions on one from a newer vehicle with the serpintine pully that would work? (making new lines is not an issue either)
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