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'68 OLDS 4-4-2

smokin_olds442smokin_olds442 Posts: 41
edited March 5 in Oldsmobile
roughly two months ago I bought a 1968 Olds 4-4-2 W30(so the previous owner says). The previous owner had blown the Olds 400 engine and replaced it with a Chevy 400 engine. Since day one I have loved this Chevy version of the 400 as opposed to Olds' version. Parts were cheaper and easier to find. as it stands now...587.9HP@6500RPM and 546LB-FT@4500RPM. these numbers are at the rear wheels and the engine is FAR from stock(redline is 7500rpm). specs are available


  • lancerfixerlancerfixer Posts: 1,308
    Lemme's the best front wheel drive car you've ever owned.
  • modvptnlmodvptnl Posts: 1,352
    Great, useful info. But sometimes the comedy far out weighs all.
  • andre1969andre1969 Posts: 21,606
    ...wasn't there a Town Hall member who dropped a Toronado drivetrain into an old Chevelle or other GM midsize?
  • "Lemme's the best front wheel drive car you've ever owned."

    Actually no, it IS rear wheel drive.
  • lancerfixerlancerfixer Posts: 1,308
    Please turn your sarcasm detection circuits on.
  • speedshiftspeedshift Posts: 1,598
    you need either a sense of humor or a thin skin.
  • I knew what you were tryin to do lancer and I came right back at ya.
  • jgmilbergjgmilberg Posts: 872
    If it doesn't run an Olds motor/trans combo it is only a Olds by name. Chevy engines in Oldsmobile cars are an easy swap, but are for the light hearted who don't want a real torque monster engine, and go the cheap way out. I want to see the Dyno sheet that says REAR WHEEL HORSE POWER. Did you dyno the car yourself, or did the guy do a good sell job on you?! If the guy gave you those numbers, I bet they were flywheel readings, not rear wheel figures.
  • when i bought the car it barely ran, check out the board entitled "total beaters", i had it bored .030" over because the bores were slightly tapered. i run keith black hypereutectic 11.5:1 pistons, worked edelbrock heads w/oversized valves(2.08/1.625), edelbrock performer rpm air-gap intake manifold with a holley 950cfm double pumper on top, and much much more....and i had it dynoed at a shop. it's far from the condition i bought it in. and a small block olds 400 is the same engine as the small block chevy 400 except that the bolt patterns of the heads, bellhousing, water pump, oil pan, etc. are different. the olds 400 isn't a "torque monster" compared to the chevy 400.
  • isellhondasisellhondas Issaquah WashingtonPosts: 17,369

    That IS a torque monster!
  • that's what you get when you spend over 5K on an engine that you do all the work to yourself...
  • ndancendance Posts: 323
    Not to be rude, but I doubt there's a single interchangeable part between the two. The only overlap I can think of with an Oldsmobile and Chevrolet are things like the DRCE with the Mark IV Chevrolet.
  • andre1969andre1969 Posts: 21,606
    ...I don't think the Olds engine is considered a smallblock. I believe it's more of what they called a "medium" block. I'm not sure about the 400, but I know the 260, 307, 350, and 403 all used the same block. I've heard that even the 455 used the same block!

    Same thing with Pontiac...every Pontiac V-8 I've seen, whether it's a 326, 350, 389, 400, or 455, all look to be the same block.

    I think Chevy and Buick were the only GM cars to use "smallblock/bigblock" designations.
  • I never said that the parts were interchangable but one of the 400's doesn't make gobs more torque than the other. the 2 engines are the same type...a typical 6.6L wedge engine.
  • bushonebushone Posts: 39
    Actually Olds engines are classified as Big and Small block. And from 67 or so till 70 (I think) the Olds (Big Block) 400 was used. It later gave way to the 455.

    Sadly, what he has as it stands now without the original engine in his 68... is a 442 worth about the same price as a ragged out Cutlass Supreme.
  • jgmilbergjgmilberg Posts: 872
    Was it an engine dyno, or chassis dyno? Olds motors make way more torque than Chevys! Alway have and always will. It's by design, Old engines have a long stroke with a small bore, chevy is the opposite short stroke with a larger bore. So even with an engine with the same cubic inches, you can have differing HP, and Torque ratings. A 400 olds is a big block olds engine, and will supply all the tire spinning torque you need, but they usually suffer on top end power. Anything is possible with aftermarket part, and I am comparing stock engine to one another. With all that power I would want a 4 bolt main block anyway, so the Chevy is the only way to go, Olds did not make a 4 bolt block to my knowledge.

    I know the 400 is a biig block because the W-30 pkg is a big block pkg, the W-31 pkg was a small block. That's easy enough to look up if you don't believe me.
  • ndancendance Posts: 323
    I think the only difference between the Olds 'big' and 'small' block is deck height.

    (I think these numbers are right, subject of course to the factory monkeying around with the values).

    LS6 454 -> 450 hp / 500 torque
    W30 455 -> 370 hp / 500 torque

    (oh well, so much for the bore:stroke theory)

    Honestly, I think that torque is a calculation based on a batch of things I'm not smart enought to figure out. Not just bore vs. stroke, but rod angle, head design, flow through the entire intake and exhaust system. It wouldn't suprise me if a whole batch of work hasn't been done (at least by the sprint car guys) moving the location of the piston pin up and down, to fool with rod length and not change total stroke.
  • modvptnlmodvptnl Posts: 1,352
    There is a trick to building small block Fords (I heard that it works on 396 Chevs also). You put the piston in backwards which increases rod ratio SLIGHTLY which in turn increases dwell @TDC which in turn increases cylinder charge(if your cam is ground to take advantage) If anyone wants to know why/how this works, I'll answer. I'm sure olds 442 knows!!!
  • andre1969andre1969 Posts: 21,606
    ...thanks for the info on the Olds big block/smallblock. I checked in my auto encyclopedia, and it looks like the smallblock started with the 330 in 1964, which was eventually bumped out to 350 around '68 or '69. Then later came the 260, 403, and 307 versions.

    How far back does the big-block design go? My auto encyclopedia really doesn't say anything about redesigns, just changes in bore and stroke. But the Rocket V-8 that came out in 1949 wouldn't be the same big-block design as what became the 425, 400, and 455, would it?

    Oh yeah, my book also lists a 400 as being available for 1975, having a bore X stroke of 4.12" x 3.75". I'm guessing that was actually a Pontiac 400, though?
  • bushonebushone Posts: 39
    There is a easy to read, and follow, page on Olds engine FAQ's (with hyperlinks to more detailed info)that I found several years ago. I was looking to beef up my 403 or drop in a 455 at the time.

    Check it out if you have a min. Oh, also it reports the olds 400 was last used in 69.

This discussion has been closed.