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Big block swap in K5

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by **DONOTDELETE**, Feb 5, 2001.

    I want to put a 454 in my K5 and want some feed back from all you guys running rats out there. I don't forsee it to be a very difficult swap but like most projects something always comes up. Let me know if the swap is worth it, does the wieght gain make for bad handling, will i need HD front springs, etc.
     
  1. TheBlazerKid

    TheBlazerKid 1/2 ton status

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    Mine handles the same, and i just have 4" lift springs and they hold it up just fine, what year K5 do you have? on my 71 we had to bang in the firewall to clear the valve cover, move the clutch z-bar but ahts it, I think its a bolt in on 73 and newer blazers though!

    Theres No Replacement for Cubic Inches!
     
  2. I have a 78 with a th350. will the torque converter from the th350 be able to handle the 454? Most big blocks had th400 behind them.
     
  3. Shawn

    Shawn 1/2 ton status Premium Member Author

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    In my opinion, the big block is worth it. There's only 150lb difference between a SBC and BBC so you shouldn't have to worry about your springs. If you add alum heads, the weight is almost the same. It handles the same as it did with the small block. You will need all the acc. brackets and a larger radiator. Your TH350 should be fine. Don't forget about the motor mounts and different exhaust manifolds/headers. Possibly a larger carb. Other than that, it's a simple install. It's hard to beat the power. speedomotive.com and Edelbrock.com have a few dyno's of some mild 454's with great results. Here's the one I'm building (3rd BBC):

    [​IMG]

    It's a 496 stroker. I had just test fitted the new heads and manifold. Just waiting for my gaskets and head bolts to show up.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  4. ragtop

    ragtop Registered Member

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    I put a mild 454 in my '81 camaro about 8 years ago and used the camaro's stock TH350C (lock up torque convertor) trans which then had 107,000 miles on it. I run the S*** out of it, have a dash switch to lock up the conv, have put another 150,000 miles on it, and the only problem I've had is that the front seal on the TH350C is starting to leak.

    Ragtop - '88K5
    Never thought I'd give up Camaros but, the '96 Z has been parked for a year!
     
  5. BurbinOR

    BurbinOR 3/4 ton status

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    Dang that's a beauty Shawn.............almost makes me wish I went Rat instead of my TPI406..............almost.

    <font color=orange>'79 - 406 TPI -<font color=orange> K5#5 - <font color=blue>See it at---&gt;<A target="_blank" HREF=http://www.blazzinor.coloradok5.com>http://www.blazzinor.coloradok5.com</A>
     
  6. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Thanks! Yeah, your 400 small block almost makes me wish I stayed with a mouse... almost.... [​IMG]

    Take care!

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  7. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    ok as long as we are talking 454's i have a ? i have a 350 now and a sm465 will i need a new bellhousing 4 my sm465 if i go to a big block?

    s.smith 77blazer lookin 4 mud [​IMG]
     
  8. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Nope, your 465 BH will fit just fine. Mine did.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  9. 454jimmy

    454jimmy Registered Member

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    I have a 454 in my 85 Jimmy and I wouldnt give it up for nothing. if you look at it it looks like it came from the dealer that way . when I go to the parts store and tell them I need parts for the 454 they ask "what year of truck its in" and they try to look up an 85 Jimmy with a 454 they ask again , LOL I love it. so go for it you , aint that dig of a deal to do.
     
  10. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    I have an 83 with a 465 and small block, will the manual clutch linkage bolt up to the big block?

    Any suggestions..

    Thanks,
    John
     
  11. thatK30guy

    thatK30guy 1 ton status Premium Member

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    The clutch linkage will work fine between SBC and BBC.

    I run two 454's. One in my 85 and the other in the 82. The 85's has a steel crank and is suped up a little. The 82 is basically stock, but has few up grades. This is the one I "tear the crap out of". Both are holding up fine and lots of power. I wouldnt install a SBC if one blew up!!

    Shawn, that's one SWEET BBC!!! What are you doing with the old BBC when you swap?
     
  12. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Thanks K30! Actually, that is the same block I had in it previously. I wish I would of kept it in there and got another for the build up but I had problems finding a cheap 4 bolt. If I was smart, I would of just used a 2 bolt block and had it splayed or just stay with a 2 bolt design. I have many extra big block parts left over from the low milaged GM reman plus new parts I have purchased but don't need: crank, rods and pistons (like new), truck heads, fresh 049 oval heads w/2.19 valves ($600 in them), Chevrolet valve covers, new damper, new head bolts (2 sets), like new corvette oil pan (has windage tray, studs and trap door). I'll eventually be putting these parts on E-bay unless anyone here wants a part or two, just let me know.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     

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