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Old 03-25-2003, 11:10 PM   #1
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Join Date: Jan 2001
Location: Hurricane, WV
Posts: 383
Car: 01 Z28 and 89 Iroc
Engine: ls1 fti 3600,S60 w/3:73 gears
Transmission: A4
Axle/Gears: 3:23

Classifieds Rating: (9)

Head porting question (601 castings)

I bought these 305 heads that have already been opened up with larger valves with a 3 angle valve job and a bowl blend. The runners are still unported and still as cast. I have been reading up on heads and bought a book on it. I have followed a few posts here on the subject.

One thing they always say is to have the valve seats machined after doing the porting. Since I already have the larger valves and they hardly have any miles on them, can I skip taking them to the machine shop for any reason?

I know I will have to be extra careful around the seats. Depending on how much they took out I might do some work around the valve guides. Thanks in advance for any advice.

I will start on this hopefully next week after the 305 comes out for the 350 that's going in.
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Old 03-25-2003, 11:41 PM   #2
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Engine: 350, Vortecs, 650DP
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They only tell you to have the seats cut after the porting because most people port their stock heads while the engine's being rebuilt.

They say to wait because if you do nick the valve seats (and you will ), it'll be fixed when you have the seats cut. If you have them cut first, then nick one of them, you get to pay to have that seat(s) cut AGAIN.

Which book did you buy?

Last edited by AJ_92RS; 03-25-2003 at 11:49 PM.
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Old 03-25-2003, 11:57 PM   #3
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Join Date: Jan 2001
Location: Hurricane, WV
Posts: 383
Car: 01 Z28 and 89 Iroc
Engine: ls1 fti 3600,S60 w/3:73 gears
Transmission: A4
Axle/Gears: 3:23

Classifieds Rating: (9)

Maybe for now, I'll avoid that area. Hopefully the bowl blend they did was enough. I bought the book by Dan Vizard.

I just won this auction on Ebay for the grinder. Is this one good enough? No name brand but dirt cheap.

http://cgi.ebay.com/ebaymotors/ws/eB...ME:B:EOAB:MT:6
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Old 03-26-2003, 12:23 AM   #4
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Location: Calgary, Alberta, Republic of Western Canada
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Car: 1986 Sport Coupé
Engine: 305-4v
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Port and polish them for sure!!!

Follow the link at the end of my sig.
__________________


1986 CAMARO SPORT COUPÉ

5.0 Liter 305 hp
Hooker 2460 Shorty headers, mandrel bent 3" exhaust
Walker Quiet-Flow muffler and dual 2 1/2" pipes
Edelbrock Performer intake with 1406 600 cfm carburetor
Ported and polished 305 "601" heads à la F-Bird'88
305 HO dual snorkle aircleaner with K&N filter
Crane PowerMax 260 camshaft (.427 - .454) and lifters
Proform HEI coil and module, MSD cap, rotor and 8.5 mm Superconductors
700R4 with TransGo Stage2 shift kit and Derale 12000 lb. gvw trans cooler
3.42 gears, KYB Gas-A-Justs and Z-28 front and rear anti-sway bars
Goodyear Eagle HP (200km/h) 225x60R15s on 15x7 styled aluminum slots
T-Tops, A/C, tilt, cruise, variable wipers, power steering, brakes, windows, locks and rear hatch
Alpine CDA-9827 4 channel AM/FM CD-MP3 receiver with Pioneer and Rockford-Fosgate speakers.
_ _ _ _ _ _ _ _ _ _ _ _ _____________ _ _ _ _ _ _ _ _ _ _ _ _
Yea verily, and he sore smote the smog heathens from his smallblock Chevrolet, even from the air pump unto the converter....
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Regardez mon coupé formidable ici!!! http://www.thirdgen.org/rides/index....ew&rideid=8338

Port and polish your own smallblock Chevy heads! Let me show you how: http://www.thirdgen.org/techbb2/show...hreadid=117410
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Old 03-26-2003, 12:31 AM   #5
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Look in this post for a speed control (you'll need it). http://www.thirdgen.org/techbb2/show...hreadid=168275

Hard to say how long that die grinder will last or how good of a job it will do. You'll probably need more abrasives to complete the job properly.
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Old 03-26-2003, 12:47 AM   #6
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Join Date: Jan 2001
Location: Hurricane, WV
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Car: 01 Z28 and 89 Iroc
Engine: ls1 fti 3600,S60 w/3:73 gears
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Classifieds Rating: (9)

lol, I have no intentions of using those abrasives in the pic if that's what you mean
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Old 03-26-2003, 06:24 AM   #7
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At that price...you might need 2 or 3...just remember...you get what you pay for.

Find an old valve to put in while you are working the bowel area..this will help protect the seats...I hope, Mine have 0 miles on the valve job..and I hope not to mess them up..
__________________
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406 sbc.RHS built..Fully ported Dart/World Sportsman II . Crane roller cam.Comp 1.5 roller rockers,TRW forged pistons 9:1 compression. 800cfi Holley.Ported Holley contender intake..Moroso 7 qrt pan..Hooker Super Comps, Ministarter, Summit Racing Seat, 5 point harness, Spohn Torque arm. Spohn 8 point roll cage, Sphon Sub frame connecters. Sphon line lock. B&M mega Shifter, Manual steering box. Race built 700r4 stage 111 shift kit, 4"cowel hood by Harwood, 28x10" Hoosiers on 10" Welds rear.. 28x4 1/2 Hoosiers on 3 1/2 welds up front .Oh Yes Getting serious now!

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Old 03-26-2003, 06:24 AM
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