350 head port & polish and cam swap

Discussion in 'Small Block Tech' started by EasyCompany7, Jun 14, 2013.

  1. EasyCompany7

    EasyCompany7 Semper Fi

    My son and I started pullin apart the GS motor this week for some enhancements. Started a picture log as well, will post them as we go along. Have the porting and polishing tools, TA 212 cam, TA lifters and stage 1 springs. Will be sending the heads out to be milled .060 for just under 10-1 compression and a multi angle valve job after we port and polish.

    the start.jpg
    removed cooling system.jpg
    removed alternator coil fuel pump.jpg
    removed distributor #1 piston at TDC.jpg
    removed timing cover water pump harmonic balancer.jpg

    On the last pic you can see that we're looking at the timing chain, which brings up the question "how do i measure for too much slack in the chain?" The gears and teeth are all metal, installed about 25,000 miles ago during a rebuild. I searched the forum but didn't find a specific tolerance.

    Thanks for your help.........
  2. RIVI1379

    RIVI1379 Well-Known Member

    those are cheap components, i say just get a new set unless budget is that tight.
  3. EasyCompany7

    EasyCompany7 Semper Fi

    Good point, there's room in the budget for wear items, and they gotta come off anyway. Thanks.
  4. jay3000

    jay3000 RIP 1-16-21

    Agreed. A timing set is about $20.

    Good luck. Keep us posted and give a before and after butt dyno..
  5. EasyCompany7

    EasyCompany7 Semper Fi

    Yeah, last August we were at the Lapeer International Dragway, my first time at the strip, ever. My best time was 16.03 at 88.7 mph, but that also includes a 2.5 second 60 foot time, which i know is really slow. I need more practice launching with a 4 speed. So if i take a second off for a proper 60 foot time, the base to improve on is 15.0.

    Thanks, we'll keep posting our progress..........
  6. scott kerns

    scott kerns Silver Level contributor

    I recently started porting and polishing my 350 heads and while it is fun it can be messy. Are you using Jim Burek's "The Port Authority" article as a template for the port and polish? I'll be glad to show you photos of what I've done so far.

  7. EasyCompany7

    EasyCompany7 Semper Fi

    Hi Scott, yes that's one of the articles we're using as reference guides, there are also some good threads on here as well, such as "Head Porting-the Home Game"..........

    And by all means, post some pics...........tonight we'll be taking the carb and intake manifold off...........removing the heads on sunday.......
  8. UNDERDOG350

    UNDERDOG350 350 Buick purestock racer

    If you want to see some heads I sectioned so you know where not to grind your welcome to stop by.

  9. scott kerns

    scott kerns Silver Level contributor

    Hey Steve did you post sectioned pictures here before? If not I would like very much to see them.

  10. GS Jim

    GS Jim Platinum Level Contributor

    Hi Steve, I'm in Linden just North of You. I built up my 350, Ported Heads and such. Let me know if you need help with anything. I have some parts if yer looking for anything. Get in touch.

  11. EasyCompany7

    EasyCompany7 Semper Fi

    Hi Steve and Ponch, it's really good to know that there are some experienced Buick folks nearby..........we removed the Qjet and intake manifold on Fri, and the valve covers, and rocker arms last night. The header bolts are stubborn so we have them soaking in liquid wrench and will try to give them a turn tonight. When we get the heads off we will certainly be contacting you for a visit to learn about what to do and not do from guys who have done this, in person...........the articles that i've read and printed sure have helped, but it's good to talk things over.....especially when it comes time to degree the camshaft............Thanks, will be in touch soon........
  12. scott kerns

    scott kerns Silver Level contributor

    Here is the progress with one of my heads...see pics below

    Attached Files:

  13. j maple

    j maple Well-Known Member

    Wow Scott those are some really good pictures they should be in a sticky thread...
  14. EasyCompany7

    EasyCompany7 Semper Fi

    Yeah Scott, those look great, thanks for posting those pics!

    We got the headers unbolted and the driver's side head off last night. No valve seat recession and no ridges in the cylinder walls.

    Cal removing headers.jpg
    removed drivers side head.jpg
    untouched drivers side head.jpg

    Hope we can get them to look as good as Scott's do!!!!
  15. GS Jim

    GS Jim Platinum Level Contributor

    I have a 350 head or Two if you want to practice on if you'd like.

  16. scott kerns

    scott kerns Silver Level contributor

    Thanks Guys. If you really think it should be a sticky thread I'll see what can be done. I just remeasured all my intake and 2 of the exhaust ports and here are my measurements. 155cc on the PORTED first two intake ports and 153cc on the second two intake ports. UNPORTED intake was 147cc for a difference of 6-8 cc. 2 of the PORTED exhaust ports measured 121cc. The UNPORTED exhaust port measured 115cc for a difference of 6cc.

    Last edited: Jun 19, 2013
  17. EasyCompany7

    EasyCompany7 Semper Fi

    Got the passenger side head off last night, no ridges on the cylinder walls and no valve recession..........i cc'd two combustion chambers in each head and each one took 50 cc's (+/-1)...........time to remove the valve spings and valves, degrease the heads, and get to work.........

    Thanks Ponch for the offer of a practice head..........got some company coming in this weekend, after that i'll be contacting you and Steve for experienced advice.

    removed heads.jpg
  18. scott kerns

    scott kerns Silver Level contributor

    That is good news!

  19. EasyCompany7

    EasyCompany7 Semper Fi

    Gents, just an update.......since the middle of June, in between out of town trips, business meetings, storms knocking out power for days, bathroom demo and rebuild, i've been able to put about 11 hours into the driver's side head. Hogging out the intake runners and gasket matching them certainly takes the most grinding. Rounding down the valve guides and grinding down the casting junk isn't so bad. Still got to polish the combustion chambers and the exhaust..............been learning a lot, and enjoying doing it myself, with the help of my son........
  20. EasyCompany7

    EasyCompany7 Semper Fi

    Question for you Scott.......in your pictures above of the middle exhaust ports, #6 of 6, i noticed you ground down the two nubs in the upper outside corners of the ports. It's where the heat stove assembly bolts on to the head, i assume. My question is, after you ground the nubs down, did it leave an opening to the bottom of the bolt hole?

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