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07-20-2004, 08:18 AM | #1 |
Registered Member
Join Date: Sep 2002
Location: Boston
Posts: 592
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How much lower valveguide is really necessary?
I'm working on home-porting some gt-40p's and gone through mouse's home porting tutorial (and everythingh else I can get my hands on) in addition to logging hours of practice with my dremel on some old 351C heads so I get the feel of polishing metal. Seems like some of the biggest gains to be had are football shaping the valve guides (amongst other things). I was thinking........
How much valve guide really needs to be hanging into the ports? What would happen if I smoothed the entire valveguide down and blended it in so only the valvestem itself protruded into the port? I mean... There _does_ seem to be enough guidesleeve in the "upper" part of the guide to keep the valve straight without any problem. Is there some harmonic/vibration issue at hand that I need to take into account? Granted I have never seen a ported head without valveguides at all...... What do you all think? Am I being crazy again? What if I just shortened them?
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior |
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