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  1. #1
    Join Date
    Jun 2003
    Location
    Buffalo, Minnesota
    Posts
    145

    Default Headers for Buick 350 fit on Buick 340?

    Will headers for a Buick 350ci fit on a 66' 340ci (350 wildcat)

    that
    pat
    Restoring 1966 Lesabre (340 2bbl Rochester carb) 2 Speed auto

    LET'S START THE FIRES AND LIGHT THE TIRES

    NEED A GREAT BOAT
    www.warrior-boats.com/index.html
    Drive fast, see God, Hit Brakes

  2. #2
    Join Date
    Dec 2003
    Location
    Endicott NY
    Posts
    178

    Default

    Nope Unfortunetely they dont, or I would have done it by now. I think our best alternative (Ive got a 340 too in my 66 LeSabre) is postons. They make them for the 340 skylark, but they told me u could modify them to fit in the lesabre. I'll probly be doing that myself.
    Joe
    66 LeSabre 2dr Hardtop 340 4 barrel and some more
    02 Wrangler sport- d44, 3" ft suspension lift, 33x12.50 super swamper tsl's (summer) 32x11.50 bfg a/t's (winter) cragar 398 black rims
    99 GMC Sierra 1500 SLE -traded in
    89 GMC Jimmy 4x4 - sold for $50

  3. #3
    Join Date
    Feb 2002
    Location
    Alexandria, VA
    Posts
    598

    Default

    Does Postons really have 340 headers in stock? I've seen so much misinformation about this for years. Has anyone actually bought them from Postons within the past five years?
    Harry Newman
    1966 Skylark 340-4
    Parents bought new
    frame-off;200-4R;many other upgrades

  4. #4
    Join Date
    Dec 2003
    Location
    Endicott NY
    Posts
    178

    Default

    Yes Postons does have headers for the 340, Ive called them about them. Havnt bought them yet but I am planning too.
    Joe
    66 LeSabre 2dr Hardtop 340 4 barrel and some more
    02 Wrangler sport- d44, 3" ft suspension lift, 33x12.50 super swamper tsl's (summer) 32x11.50 bfg a/t's (winter) cragar 398 black rims
    99 GMC Sierra 1500 SLE -traded in
    89 GMC Jimmy 4x4 - sold for $50

  5. #5
    David Gramlow Guest

    Default

    66BuickLeSabre said:Yes Postons does have headers for the 340, Ive called them about them. Havnt bought them yet but I am planning too.
    Joe
    But did they say "in stock, ready for immediate shipment"? They've been known to take orders and not tell a guy they don't know when they will have stuff in stock. 340 headers are likely a very rare sale for them.

  6. #6
    Join Date
    Feb 2002
    Location
    Alexandria, VA
    Posts
    598

    Default

    When you receive them and they fit, then I'll believe that Postons really does sell them.
    Harry Newman
    1966 Skylark 340-4
    Parents bought new
    frame-off;200-4R;many other upgrades

  7. #7
    Join Date
    Jun 2003
    Location
    Lisbon Ohio
    Posts
    57

    Default

    ha ha ha i got my headers from postons and put them in and didnt fit with out some modifications and i called them back january 9th 2004 and he said they made another run of 50 sets and has only sold ten sets so they still have 40 sets left but i feel after hearing my headers when they were still open it was worth it to me i hope noone else has so much trouble gettin them in i still have to modify them to get it right
    JOSH.
    Josh. M
    1967 Skylark
    1993 Century

  8. #8
    Join Date
    Feb 2002
    Location
    Alexandria, VA
    Posts
    598

    Default

    Sorry to hear you've had so much trouble with the fit. It amazes me that they can't design something to easily fit an engine that was produced for only two years and without any significant evolutionary changes.

    You would think that if they had just gotten the header prototype to fit well on any 66-67 A-body (or B body) with the 340, there would no individual complaints and probably more sales.

    I wonder how they fit on the 300, since they are sold for both engines?

    Just my opinion, I would like them, but not with a serious hassle.
    Harry Newman
    1966 Skylark 340-4
    Parents bought new
    frame-off;200-4R;many other upgrades

  9. #9
    Join Date
    Jul 2003
    Location
    Ayrshire, Scotland, UK
    Posts
    33

    Question A question for Myred340?

    Hi there to all,
    I called Poston (credit card in hand) and asked if the headers for the 340 would fit in my 340 2door LeSabre 1966, and the guy said "no they won't fit, they were designed for the "A" body car".
    Please could you tell me how much work and what you had, or have to do to get them to fit in the LeSabre.
    I would normally just buy a set and work it out when I get them , but I am in Scotland UK and will have to pay $200 postage, import tax£? and VAT (UK sales tax) at 17.5%.
    I would be grateful if you could tell me what you had to cut, weld, modify on the headers and on the car body, if you don't think it causes any problems, I'll buy a set, let me know. My car is a column shift automatic, cheers Louis
    Louis
    Rebuilding 1966 Buick LeSabre custom, 2 door hardtop, 340ci ST300

    Scotland, United Kingdom

  10. #10
    Join Date
    Jun 2003
    Location
    Lisbon Ohio
    Posts
    57

    Default

    well i put them in my 4 door skylark with a 340 i had to drop the tranny because i didnt have cherry picker any more un bolt engine lift it up on side at time to get them in then i have to move porportion block ding them to clear steering rod then on pass side i han to heat and push in tube that comes off no 6 cylinder then number 2 pipe hit upper a arm had to ding it to clear had to reem holes bigger number 8 so i could bolt them up it was a pain in --- but i like them i would of thought they would fit better for the cash and postons didnt seem to want to take them back be fore i modified them so i had no choice i put them on im not satisfied with what i had to do to get them to worki hop i dont run in to any more troubles but yeah right hope this dont scare you to much. josh
    Josh. M
    1967 Skylark
    1993 Century

  11. #11
    Join Date
    Feb 2002
    Location
    Alexandria, VA
    Posts
    598

    Default

    Louis,

    You may want to consider what advantage you will gain by getting headers. There was a post I read about two years ago (perhaps on the BPG email list) by a guy who had worked on and modified many 340's. His point was that the 340 exhaust manifolds were very efficient.

    If that's the case, and you want to install a FlowMaster or other exhaust system, then just have a local shop make connector pipes from the manifolds to the exhaust system.
    Harry Newman
    1966 Skylark 340-4
    Parents bought new
    frame-off;200-4R;many other upgrades

  12. #12
    Join Date
    Jul 2003
    Location
    Ayrshire, Scotland, UK
    Posts
    33

    Thumbs up HI thanks for the info

    Hi, thanks for the info, that sounds like a real nighmare to get them on the car!!(that they are made for!), I might give them a miss for now!.
    I had read about the factory manifolds flowing very well, and at the moment I am rebuilding the car, but have made a 2 and a 1/2 inch dual system with straight through boxes. One of my manifolds was broken in two, between cylinders 4 & 6, but I know a guy who can weld cast iron and have had it repaired, so it will do for now, I just liked the idea of tube manifolds sliding on to my system, though it would look good.
    I find it very hard getting used parts over here in Scotland, and the shipping on a used pair of factory manifolds from the States is about the same as the shiping for tube headers(ligher weight), thanks again for the replies, I will post some pictures when I get a bit more done.
    Any of you guys know where I can get body repair panels?, I need rocker panels and lower rear quarter panels (both sides).
    As far as I am aware my LeSabre is a 1966 GM 2 door "B" body car, and shares the same body as pontiac Bonneville and possibly an impala, any ideas?, cheers Louis
    Louis
    Rebuilding 1966 Buick LeSabre custom, 2 door hardtop, 340ci ST300

    Scotland, United Kingdom

  13. #13
    Join Date
    Jul 2003
    Location
    MI
    Posts
    844

    Default

    Lesabre would be the equivalent of a Pontiac Catalina or Impala body. The rockers may work, but the sheetmetal like the quarters was all different...I doubt any is interchangeable...

    Aaron
    1953 Buick Special Riviera! 263 I-8
    1965 Skylark 300-4V
    1965 Mustang 289
    1965 Corvair Monza Convertible
    1965 Dart 170 Wagon

  14. #14
    Join Date
    Feb 2002
    Location
    Alexandria, VA
    Posts
    598

    Default

    I'm going to read off the "B" bodies as listed in the 1966 Body by Fisher Service Manual:

    Chevrolet Biscayne, Belair
    Pontiac Bonneville, Grand Prix
    Oldsmobile Jetstar, Starfire
    Buick LeSabre, Wildcat

    That being said, it is unlikely that sheet metal will interchange due to different styling. But a Hollander's Interchange Manual for that year may show some possibilities.

    On the postive side, chassis items like shocks and joints will interchange.
    Harry Newman
    1966 Skylark 340-4
    Parents bought new
    frame-off;200-4R;many other upgrades

  15. #15
    Join Date
    Dec 2003
    Location
    Endicott NY
    Posts
    178

    Default

    Well I ordered a set from postons last night, with the bare shipping of $22. I wont be putting them on til spring, and will have the help of my cousin, a mechanic who had to modify headers for his 66 skylark because it had a chevy 427 in it and he needed to modify alot. Hopefully it wont be to bad but I'll let u know how long it takes to get them.
    Joe
    66 LeSabre 2dr Hardtop 340 4 barrel and some more
    02 Wrangler sport- d44, 3" ft suspension lift, 33x12.50 super swamper tsl's (summer) 32x11.50 bfg a/t's (winter) cragar 398 black rims
    99 GMC Sierra 1500 SLE -traded in
    89 GMC Jimmy 4x4 - sold for $50

  16. #16
    Join Date
    May 2002
    Location
    barberton Ohio
    Posts
    234

    Default 300 headers

    Hey guys i bought a brand new set of headers from a guy on the board that bought them but never put them on any ways i put them on the passenger side went right in. The driver side was a little diffrent a had to lift the engine and move the portion block to a diffferent place then redo a couple brake lines. All in all it wasn't that painful. I didn't have to bend any tubes or ding anything. And as a matter a fact the fit really well the they up tight against the floor and cleared everthing. I had a harder time putting headers on my buddies small block chevy in a 79 cammaro. Any ways i haven't really driven the car yet but it is obvious that the engine breathes better. I can se and hear this in the throttle response the car has. So i think there is a little more bennifit than people are letting on.

    thanks Adam

  17. #17
    Join Date
    Dec 2003
    Location
    Endicott NY
    Posts
    178

    Default

    Yea I hope mine arent too bad, but like I said my cousin will be helping out and he had to put some in his skylark, with the 427 chevy so Im sure he could get this to work. I'll let you guys know in 2 1/2 months.
    Joe
    66 LeSabre 2dr Hardtop 340 4 barrel and some more
    02 Wrangler sport- d44, 3" ft suspension lift, 33x12.50 super swamper tsl's (summer) 32x11.50 bfg a/t's (winter) cragar 398 black rims
    99 GMC Sierra 1500 SLE -traded in
    89 GMC Jimmy 4x4 - sold for $50

  18. #18
    Join Date
    Dec 2003
    Location
    Endicott NY
    Posts
    178

    Default

    Well I ordered my headers from postons on Tuesday the 13th of January, and I did not do overnight shipping or anything special, just the cheapest ground shipping ($22). I got the headers today, Monday January 22. Was faster then I expected, they look pretty good. Just wanted to let you know I got them, and in April I'll let you know how they come out.
    Joe
    66 LeSabre 2dr Hardtop 340 4 barrel and some more
    02 Wrangler sport- d44, 3" ft suspension lift, 33x12.50 super swamper tsl's (summer) 32x11.50 bfg a/t's (winter) cragar 398 black rims
    99 GMC Sierra 1500 SLE -traded in
    89 GMC Jimmy 4x4 - sold for $50

  19. #19
    Join Date
    Aug 2003
    Location
    Southern NJ
    Posts
    279

    Default 300/340 headers

    Joe & Pat,

    Just a heads-up.
    The 66 lesabre being a "B" body has the centerlink of the steering linkage to the rear of the front frame crossmember.
    Just be aware that as the header exits the head and turns
    down to the collector that the steering linkage could be a problem area.
    In addition, the driver side header could possibly interfere with the steering box.
    Hopefully these areas will not impact the installation.
    Good luck!
    Let me know how it turns out.

    Tom
    Tom
    1965 Lesabre (455ci/ST-400/3.73gears)
    1968 Skylark (gone)
    1986 Century (gone)
    1994 Lesabre (140,000 miles)

  20. #20
    Join Date
    Dec 2003
    Location
    Endicott NY
    Posts
    178

    Default

    Thanks for the heads up Tom, will be sure to remember when april comes around.
    Joe
    66 LeSabre 2dr Hardtop 340 4 barrel and some more
    02 Wrangler sport- d44, 3" ft suspension lift, 33x12.50 super swamper tsl's (summer) 32x11.50 bfg a/t's (winter) cragar 398 black rims
    99 GMC Sierra 1500 SLE -traded in
    89 GMC Jimmy 4x4 - sold for $50

 

 

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