Need Cam Advice- 331CID w/Big Alum Heads

Discussion in 'Engine Topic' started by Christopher McBurney, Feb 12, 2021.

  1. 450bench

    450bench Veteran Member

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    Just an opinion, but you’ll need some rpm to make power. Still a nice combo with a 4 speed. I’d put something in with a 108 lobe separation since the compression is a bit low. I bet an old isky mega cam would make really good power. They’re on a 108.
    I ran an old cam dynamics 253/253 525/525 on a 108 in a turbo headed 331 with flat tops years ago and it ran STRONG. 7.70s in the 1/8 mile in a stock bodied 73 z28 with a 4.11 and a 4 speed, and my shifting sucked.
     
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  2. G72Zed

    G72Zed Veteran Member

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    IF the OP ever comes back to check up on this, here's my old 10.4 cr 331 SBC 91 pump gas with Iron heads, 200cc runners, 2.02 valve.

    Crane catalog solid cam, 252 with .490 lift, heads flowed 253 cfm. I tested this with 1/2 dozen spacer combo's.

    Taking away the 2" of spacers killed 20hp on top, but gave back 10-15 TQ on the bottom.

    This cam had a 112 LSA so the idle was nice, wasn't blowing the charge out the exhaust and trapped enough to give me nice VE and great efficiency as you can see by the BSFC.

    Ran real nice, and pulled on the top end like a 327 naturally does, that's a fact with the 3.25 stroke.

    Inked4_LI.jpg
     
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  3. 1980RS

    1980RS Veteran Member

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    Aside from the 15° head and a roller cam that a 5.3 LS engine has, most mods that you do on those LS engines should work well on a 327 SBC as it's a 5.3 also if I remember that right.
     

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