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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: kayster on November 16, 2010, 08:28:29 pm

Title: oval port or rectangle port?
Post by: kayster on November 16, 2010, 08:28:29 pm

Hey folks..Im buildin a 454...I'm tryin to determine what heads to use..I just had a well known engine builder tell me that oval port will be the better option for this build.. I'm strokin it to a 496 and shootin for 625hp...Why is oval gonna be better than rectangle.. goes against all i've ever know about heads..? Any input would be great..

Title: Re: oval port or rectangle port?
Post by: VileZambonie on November 16, 2010, 08:35:30 pm

I run large oval ports

Title: Re: oval port or rectangle port?
Post by: Captkaos on November 16, 2010, 08:54:21 pm

For street applications Oval ports are better.  Rectangles are better if you are planning to make high rpm power.

Title: Re: oval port or rectangle port?
Post by: ccz145a on November 17, 2010, 01:51:17 pm

large oval keeps the velocity up compared to rect and will be more responsive under 5500 rpm