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#11 |
![]() Join Date: Aug 2014
Location: Kansas City, MO
Posts: 838
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I thought the secondaries were actually in the injector housings. I am referring to the valves themselves.
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Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
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#12 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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You can port and leave them in the head.....the 2ndry ports are full sized 35-36MM in the head
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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#13 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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The secondary throttle plates are in the cylinder head at the IH/Cylinder head interface. As Lee stated, when I port matched to the IH, I only did the primary ports. I did do the head match w the heads on the motor. My garage looked a bit like a a surgical theatre w plastic wrap over the motor and only an opening over the cylinder I was working on. Used pillow foam to block the runners and would vacuum everything before removing that. As a final, I used 6" QTips dipped in Vaseline to clean up any burrs by the valves.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#14 | |
![]() ![]() Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Engine covered w/ plastic shower curtain. Only the port being worked on exposed (see ball gauge used to check clearance into the head(s). ![]() Oiled, blue shop towels (x2) stuffed into the bottom of the ports to catch debris. ![]()
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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#15 |
![]() Join Date: Feb 2024
Location: Fairfax, VA and Springfield, IL
Posts: 41
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#16 |
Join Date: May 2013
Location: Chicago
Posts: 978
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Pete and Marc both do porting.
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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