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'462' Double Bump head question...

Discussion in 'The Hokey Ass Message Board' started by RacerRick, Nov 1, 2007.

  1. RacerRick
    Joined: May 16, 2005
    Posts: 2,742

    RacerRick
    Member

    The pontiac I just bought has a set of 462 castings on its unmolested 327 engine that was swapped in from a 67' car. This engine has never been apart and has been sitting for many a year.

    In looking up these heads, I noticed that there seems to be a lot of disagreement on them. Especially the chamber cc's. I have listings from 60cc's to 67cc's.

    Has anyone actually measured a set?

    I need to know the approx chamber cc's and won't be able to tear down the engine for at least two weeks. I am going to drop them on the 350 short block I have sitting here if they get a clean bill of health. Its a basic rebuild with cast 4 valve relief flattops 0.045" down in the hole. I am aiming for mid-low 9:1 compression with a felpro 0.038" gasket. That compression should work fine with the old 327-350hp cam I have here.
     
  2. arkiehotrods
    Joined: Mar 9, 2006
    Posts: 4,329

    arkiehotrods
    ALLIANCE MEMBER

    Here's a quote from the book, "High Performance Small Block Chevy Cylinder Heads:"

    "Head History

    The selection list is basically rather thin for today’s performance engines. The earliest 265 and 283 small-blocks relied on an iron Power Pack head that featured 58-cc chambers and tiny 1.72/1.50-inch valves. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. The easiest way to reference any production head is with the last three digits of its casting number. The most famous heads are the 461 and 462 heads that offer 160-cc intake ports, 64-cc chambers, and 2.02/1.60-inch valve sizes. For years, these were coveted castings in the performance community that were not superseded until the advent of the Chevy over-the-counter Turbo and Bow Tie iron pieces. Even for many years after their introduction, the Bow Tie was considered exotic fare for street engines."
     
  3. arkiehotrods
    Joined: Mar 9, 2006
    Posts: 4,329

    arkiehotrods
    ALLIANCE MEMBER

    From chevytalk.com

    [FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]"462" – Could be 3890462, 3891462, 3990462. The 462 is one of the best flowing production SBC heads. They were used between 1962-1968 on various HP versions of 302, 327, or 350 engines. They could have come with either 1.94/1.50" or 2.02/1.60" valves, had 64CC combustion chambers, DO NOT have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's. These heads have double hump casting marks.[/SIZE][/FONT]
     
  4. arkiehotrods
    Joined: Mar 9, 2006
    Posts: 4,329

    arkiehotrods
    ALLIANCE MEMBER

    From carcraft.com
    Small-block Chevy cylinder heads can be categorized in several different ways. One of the easiest is to group them by intake-port volume. For the purposes of this story, we will organize these heads into three categories: Category 1, 179 cc and smaller; Category 2, 180 cc to 199 cc; and Category 3, 200 cc to 220 cc. Unmolested production heads generally fall in Category 1, but not always. For this test, we've evaluated most of the popular heads. For the earlier heads, we'll refer to them by the last three digits of their casting number, as in 462 heads, which were early castings that had a 64cc combustion-chamber volume and were used on 327 and 302 engines. The later heads will be referred to by their application, such as the aluminum L98 TPI castings, the LT1 and LT4 5.7L engines, as well as the cast-iron Vortec head and the new LS1.
     
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  5. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,209

    SinisterCustom
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  6. pittsburgholdschooler
    Joined: Jul 30, 2007
    Posts: 178

    pittsburgholdschooler
    Member

    The Most desireable of that series is the 461 "X" castings...look at the bottom of the runner area on the head for a cast in "X"...these were used on Fuelie vette engines and have larger, smooth ports, and the smaller CC chambers...i ran these for years on 327s I ran in my Vega....
     
  7. arkiehotrods
    Joined: Mar 9, 2006
    Posts: 4,329

    arkiehotrods
    ALLIANCE MEMBER

    The "Chevrolet Small Block V-8 I.D. Guide" says all the 462 castings were 64 cc except for the 1967 casting 3890462, which had 66 cc. That head was used on the '67 302 in Z/28s and in some 327s in passenger cars (2.02/1.6)
     
  8. RacerRick
    Joined: May 16, 2005
    Posts: 2,742

    RacerRick
    Member


    This is a 67' engine - with head casting 3890462. It s a 300hp 327.

    Thanks, this should work perfect, but I may use the thinner gaskets.
     
  9. I can say that the pairs of 462s I've done in the past were all (nominal) 64cc chambers....they tend to be closer to 65-66 in my experience....the two center chambers are more toward the high side of this than the outer two. Dunno why, maybe the mold guy was feeling queasy that day. :D
     

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