[gtopappy]

My old 670 heads have 2.11/1.77. My new E-heads have 2.11/1.66. What is the advantage of the smaller exhaust valve size?

Chuck Rose
www.allisonracing.com

[gtopappy]

My old 670 heads have 2.11/1.77. My new E-heads have 2.11/1.66. What is the advantage of the smaller exhaust valve size?

Chuck Rose
www.allisonracing.com

[WDCreech]

Better intake to exhaust flow ratio. Apparantly the E-head, like my Wenzler High Ports (2.15/1.65) flow too well on the exhaust side compared to the intake.

Bill

[Firebird455]

Im not sure...but every single article ive read on the Eheads say that they need to flow more on the exhaust....they flow almost 100 more cfm on the intake than exhaust...if I could id bump the 185 exhaust cfm to about 210 cfm.

Project: Black Hawk
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2001 Camaro Z28 M6:
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[PONTIAC DUDE]

Depends on application.
And you need to watch out for too much exh. flow for your cam profile too.

The E-head 1.66 flows as good as the iron head 1.77 because of a better port design. Same deal as why the 2.11 port flows better then the stock iron head 2.11.

It's all about design.

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[gtopappy]

Thanks for the responses. I appreciate your help.

Chuck Rose
www.allisonracing.com