Pulled the plenum. Need to know whats original and whats not.

[1991KOTH]

Okay so I just pulled the plenum to change the coil packs. Id like to know whats been replaced and what hasnt.

First is the fuel injectors. Do they appear original?
https://uploads.tapatalk-cdn.com/20170506/96c04f76d38dcece18b76264f4e6e0fb.jpg
https://uploads.tapatalk-cdn.com/20170506/3ba8d593f0de3fdc3d46d3c5639cf511.jpg

Next up is the coil packs:
https://uploads.tapatalk-cdn.com/20170506/b0f3f29d0312cd692635abd035d1c2f0.jpg

Lastly is the runners. Are they ported?
https://uploads.tapatalk-cdn.com/20170506/3652fc5d3632a129ca678486882dbf31.jpg
https://uploads.tapatalk-cdn.com/20170506/575b031b494a4ef5564821e2faa27633.jpg
https://uploads.tapatalk-cdn.com/20170506/1f32e1009f8ff0ad8c81a63b3f6b11b4.jpg

Thanks for all the help on forum. It really helped out!




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[1991KOTH]

Also: does this rubber tubing does not seem to want to go back on.
https://uploads.tapatalk-cdn.com/20170506/3ded5d466a7201624668c716ab6f8f9c.jpg
https://uploads.tapatalk-cdn.com/20170506/28a9c2c25d153ea435a8e5345aca7852.jpg


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[G8nightman]

Injectors look original coil packs don't

[Dynomite]

Injectors look original coil packs don't
Concur........No Porting....rubber tubing looks like new PCV connector.....just squeeze the fitting into the rubber tubing.....same with that rubber connector on two PCV valves.

Since you have it this far......remove coils and recondition the Starter Solenoid as well as the Valley Drain. Look for oil leaks........ and loose connectors on vacuum system. Tighten bolts or re-install bolts on Crankcase Cover and check all Injector Housing Bolts....re-installing any that are loose with blue Loctite.

Basically......do a Top End Reconditioning.

TOP END RESTORATIONS SUMMARY
Post 62 - 1990 (#2067) LT5 Top End Rebuild (C5 Z06./Wilwood Brakes, SW Headers, Aluminum Radiator) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581658776)
Post 76 - 1991 (#1427) LT5 Rebuild (C5 Z06/Wilwood Brakes, SW Headers, Ron Davis Radiator) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581690539)
Post 119 - 1990 (#3032) LT5 Top End Rebuild (Fluidyne Radiator) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-6.html#post1584987825)
Post 133 - 1990 (#0072) LT5 Top End Rebuild (Ron Davis Radiator) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-7.html#post1585219749)
Post 230 - 1995 (#0186) LT5 Specific Top End Rebuild (C5 Z06/Wilwood Brakes, Fluidyne Radiator) (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-12.html#post1590759172)
Post 261 - 90’ (#8550) Corvette (L98) Modifications (SW Headers, Ron Davis Radiator) (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-14.html#post1592505529)

[HAWAIIZR-1]

In your last photo it appears the hose for your dual PCV valves is torn? Hard to tell but maybe why not aligning to pipe?

http://www.jerrysgaskets.com/hose-dual-pcv-valves-new-90-95-9c3/


If so, contact Jerry for consultation and all the parts you need. He will help and guide you.


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[1991KOTH]

Concur........No Porting....rubber tubing looks like new PCV connector.....just squeeze the fitting into the rubber tubing.....same with that rubber connector on two PCV valves.



Since you have it this far......remove coils and recondition the Starter Solenoid as well as the Valley Drain. Look for oil leaks........ and loose connectors on vacuum system. Tighten bolts or re-install bolts on Crankcase Cover and check all Injector Housing Bolts....re-installing any that are loose with blue Loctite.



Basically......do a Top End Reconditioning.



TOP END RESTORATIONS SUMMARY

Post 62 - 1990 (#2067) LT5 Top End Rebuild (C5 Z06./Wilwood Brakes, SW Headers, Aluminum Radiator) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581658776)

Post 76 - 1991 (#1427) LT5 Rebuild (C5 Z06/Wilwood Brakes, SW Headers, Ron Davis Radiator) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581690539)

Post 119 - 1990 (#3032) LT5 Top End Rebuild (Fluidyne Radiator) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-6.html#post1584987825)

Post 133 - 1990 (#0072) LT5 Top End Rebuild (Ron Davis Radiator) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-7.html#post1585219749)

Post 230 - 1995 (#0186) LT5 Specific Top End Rebuild (C5 Z06/Wilwood Brakes, Fluidyne Radiator) (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-12.html#post1590759172)

Post 261 - 90’ (#8550) Corvette (L98) Modifications (SW Headers, Ron Davis Radiator) (https://www.corvetteforum.com/forums/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-14.html#post1592505529)


Yep, replaced coil packs, checked vacuum lines, and drain. Solenoid is next up. The runners are measuring around 35mm and the inj housing are all around 36 mm. Isnt stock just about 33mm?


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After looking at pictures of actual ported inj housings and runner theres no way my measurements are accurate LOL

[1991KOTH]

Yep, replaced coil packs, checked vacuum lines, and drain. Solenoid is next up.


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[5ABI VT]

Injectors look like FIC stainless. Coils were accel? IF that tubing is very tight thats better. Dont want any leaks from there so force the pcv line into the fitting !