are oval port "peanut" (2.06/1.72) truck heads sufficient for a street driven truck using a Comp Cams 280H (hydraulic)? ((approximately .520 lift and 290 duration at .050))

depends on what you call suffcient...They would have good torque characteristics but
would drop off at around 5000 rpm in HP.
Your cam seems to be made for medium to high
rpm use. For the street and that cam, I would
go with oval port heads. Just my opinion.

In short.
No.
What you need to find is a set of common ovalports as mentioned.Please also consider if open or closed chamber.

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DVC-2000.Racing
482 cubes of fogger injected thunder in a 71 z.
racing@mbox303.swipnet.se (http://racing@mbox303.swipnet.se)

If I can cut in for a question.
I always hear the term "open" and "closed" chamber being used.Is this just another term for the low and high(64cc)compression heads?Thanks

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67 RS RAGTOP # matching, 4X4 CHEVY TRUCK

[This message has been edited by 67drake (edited 03-23-2000).]

no its the shape of the combustion chamber.

Do you happen to know the casting numbers and engine size of your motor?Casting numbers of your heads is what I'm asking?

Closed chamber heads do make more compression that open chamber heads because the volume of the combustion chamber surrounding the valves is much smaller than the same valve area on the OPEN chamber heads. Because the actual open area of the valve chamber in the head is smaller than the diameter of the cylinder bore then they are said to be "closed" combustion chambers.

Cornholio is also correct in stating that their distinctive shape differences lend themselves to either being called closed or open chamber heads.

Stock Open chamber BIG BLOCK heads normally have between 120-125 CC size chambers while closed chamber heads vary from 110-120CC. Open chamber heads require the use of much higher domed pistons to get the same compression as their closed chamber counterparts. For this reason, you can normally run a much higher lift cam with the closed chamber heads without having to worry as much about valve to head clearance.

By the way Byrd, I concurr with everyone else on your heads. You need to change the heads to take advantage of your induction upgrades. If you leave things the way they are you may find yourself with LESS power than you had orginally due to the mismatched components.
\

Drake67,

Your welcome!!


[This message has been edited by sr71bb (edited 04-11-2000).]

Thanks,it was just one of those things I never knew,and whenever I asked,nobody could explain the difference.

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67 RS RAGTOP # matching,
4X4 CHEVY TRUCK