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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 |
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 |
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 |
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 See the saga unfold here: My 455 Firebird 2001 Camaro Z28 M6: [email protected] stock cam, stock heads, stock rear, stock clutch |
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. ************************************************** *************************** Owner of......The Quickest Pontiac Powered "REAL" Street car on the PLANET!!!!Will Race for Food. http://forums.performanceyears.com/g.../icon_wink.gif Build it fast, build it right, build a Pontiac. The #1 Smack talker on the Pontiac Boards. http://PontiacDude.cc |
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