i just finished up installing a new motor in my 85 z28. i went with a 1980 305 i had laying around with some mods. my question is what kind of headers will directly fit. i am useing the stock y pipe from the 85 so im looking for headers that will bolt up. also what year headers should i look for 1980 or 1985 or are the blocks the same

 

Does it have the oil dipstick on the driver's side or passenger side? They switched in 79-81 sometime, I forget exactly. If you have a driver's side oil dipstick you might have problems, as thirdgens are all passenger side. Otherwise, any header made for 82-92 F-Bodies will fit.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

 

it has the oil dipstick on the pass. side.
so basically any 1982 to 1992 headers will directly fit on the 1980 block ok thanks.

 

They won't fit the block, since they bolt onto the heads.

You asked in your original question what headers will bolt to the stock y-pipe. The answer to that is "none".

You should get headers for '86-later TPI with y-pipe for a single 3" cat, then get the exhaust from cat on back to match. If you try '85, it will be smaller (and may not be offered). Certainly avoid anything "made" for an LG4.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).