406 build options

Discussion in 'Engine Topic' started by cutty, Jun 22, 2016.

  1. cutty

    cutty Veteran Member

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    hey guys and gals, i got a 30 over 400,has maybe 2000kms on it, took it apart to go a little wilder, so gone are the 882s and rv cam,i have a set of camel humps,that have been ported and are fresh, just unsure on cam, wouldnt mind a mid 12 second motor, so questions are, what can i expect in compression with the 64cc heads, and what camshaft to achieve my goals with it
     
  2. hogg

    hogg Veteran Member

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    Is the pistons stock dish type, or they flat tops or a little dome? Still got the stock rods?The only experance I have had with a 400 . I over camed a stock pistoned 400 sb,stock rods with a old school .030/.03o solid left cam, set of camel humps,194/160 values ,headers , 600 eddie, 400 trbo ,336 rear. Would not do over 5500 rpm . It was a lot of fun on the street,but left line at about 3000 and was down at 5500 . I was told the stock rods was the trouble. lots and lots of power just no rpm
     
  3. cutty

    cutty Veteran Member

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    Not a dish, true flat top with 4 valve reliefs. Rods have been redone at machine shop with arp bolts
     
  4. Rich Schmidt

    Rich Schmidt Veteran Member

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    4 relief flat top pistons with camel hump heads will be a bit too much compression for the street. You will be at or close to 10.5:1. You would have a more streetable compression with the 882's. You could work the 882 heads and add some cam and get into the 12's as long as the rest of the combo is right.
     
  5. hogg

    hogg Veteran Member

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    then you could send your camel hump heads to me.
     
  6. Damon

    Damon Veteran Member

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    Yeah, with humps you're gonna be around 10.5:1 compression even with the pistons sitting .025" in the hole and a big 'ol fat Fel Pro rebuilder head gasket. I'd be looking at something medium lumpy to work with that. Around 240-245* @ .050 on a 110* LSA. Then converter and gear it appropriately to match.
     
  7. cutty

    cutty Veteran Member

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    Thinking of trying to keep it around 500 510ish lift.
     
  8. hogg

    hogg Veteran Member

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    And i thought you had to change the stock rods to get any rpm out of them, would be a fun motor at under 5500,
     

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