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Head casting

Discussion in 'The Hokey Ass Message Board' started by Rich Rogers, Nov 30, 2008.

  1. Rich Rogers
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    Rich Rogers Member

    Ok guys I"ve been looking everywhere for these chevy head casting numbers and nothing's adding up. These are on a 327 and they supposedly don't exist. Number is 3827186 camelhump design but not double hump but have acc. holes. Wanting to put these on a 4 bolt 350 as they have been done with 5 angle valve job and the owner thinks 1:94- 1:50 valves. Any help here will be really appreciated. Rich:confused:
  2. brandon
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    brandon Member

    could they be a early 350 head...? say 67 or 68:D
  3. Rich Rogers
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    Rich Rogers Member

    Well, that's what I'm trying to find out. They could be but even mortec or nastyz28 don't list that casting number
  4. HEATHEN
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    HEATHEN Member

    The "8" is really a "9". 3927186 are '69-'70 300hp 350 heads, and have fuelie head style combustion chambers with accessory bolt holes in the ends of the head castings.
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  5. Rich Rogers
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    Rich Rogers Member

    I went there BUT there's no mistake it is an "8" not a 9
  6. 29moonshine
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    29moonshine Member

    all my casting books list 3927186 like heathen said except one listed it as a z28 302 head i can not find a 3827186 in any of my books
  7. CH3NO2JAY
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    CH3NO2JAY Member

    According to this site:

    http://www.bouchersracing.com/parts/usedheads.html

    It's a Chevy 68-73 307/327 cylinder head...
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    </td> <td class="xl26" x:num="">
    </td> <td class="xl26">
    </td> <td class="xl26">
    </td> <td class="xl26">
    </td></tr></tbody></table>
  8. power58
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    power58 Member

    Could not find that casting number either. What are the casting dates ?
    Usually the heads arewith in a month of each other in casting dates. Where did you find the casting number ?
  9. Ratmotor
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    Ratmotor
    ALLIANCE MEMBER

    I would bet very good money on them being the LT1 186 heads. I had a set and they were small humps with 1.94 valves not 2.02,s. They also had the accessory mounting holes.
  10. Rich Rogers
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    Rich Rogers Member

    yep you're right. 186 heads also came with 1:94 and 1:5 valves as well as 2:02 and 1:6 .Haven't got the date code yet but these are on a 68 327 but were added at some point. I'll get the date code but that doesn't make sense to me that a 307 would have those valves so they probably are 327
  11. 29moonshine
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    29moonshine Member

    that is what i like about this site you can learn something new every day
  12. Rich Rogers
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    Rich Rogers Member

    you're right about that. The knowledge and help you can get here is amazing. Just when you think you've got your shit together on a subject, somebody on here will prove you wrong if you are. Best hot rod site on the net
  13. oldsman71
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    oldsman71 Member

    I had a set on a 350 with flat top pistons and mild cam, it ran real good to 5800 rpm
    they worked good for me, another guy in town is still running it!
  14. I have a set of 186's on an original 327. The engine has a "CE" stamp.
    (a service replacement engine that was never sold over the counter)

    Engine also has the serial number stamp from the donor car. It came out of my '62 Corvette that had the original engine replaced at a Chevy dealer in Jan. 1971. The block has a late 1969 casting date.

    The heads have the accessory bolt holes and an early Jan 1970 date. Came factory equipped with screw-in studs, pushrod guide plates and 2.02 valves. They also have the 'double hump' designation but the humps are quite a bit smaller than you're used to seeing on old school 'fueler' heads.

    3927186 heads originally came on:

    1969 Z-28 302 (2.02's, guide plates, screwed studs)

    1970 LT-1 350 (2.02's, guide plates, screwed studs)

    1970-1975 350 (1.94's, NO guide plates or screwed studs)
    These were mostly used on 1 and 2-ton 'fleet sales' trucks with motors designed for using propane. On some of thes heads, one of the accessory bolt holes is 7/16" thread instead of 3/8".

    Also used on appx. 10,000 "CE" long blocks and complete engines.
    The engines were either 327HiPo or LT1 350's. (possibly 302's)
    (all these had 2.02's, guide plates and screw-in studs)

    These are GOOD PERFORMING HEADS...
    Highly valued by the 69-Z28 crowd, especially w/late 68 date.
    Yenko and Baldwin's cars received these heads.

    2.02 heads are easy to spot off the engine without measuring. Look on the combustion chamber side and you'll notice that the valves look like they're nearly touching each other.

    On 1.94 heads the valves are about 1/8" apart.

    *edit*
    3927185 are the low performance 327 and 307 heads used 1969-1973

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