hardin 455 olds
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hardin 455 olds

  1. #1
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    Cool hardin 455 olds

    Just joined. Retired 8 months ago. Need some help on a 455 hardin olds. Have a Rochester on a 290 HP now. Don't know the spefic type as the boat is 250 miles away right now. Does anybody think I would be smart to go to a Holley for 325 or 345 HP. That should get some responce. By the way, the boat is a 18' Marktwain. Any thoughts. Gota go.

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    Quote Originally Posted by slimbones View Post
    Just joined. Retired 8 months ago. Need some help on a 455 hardin olds. Have a Rochester on a 290 HP now. Don't know the spefic type as the boat is 250 miles away right now. Does anybody think I would be smart to go to a Holley for 325 or 345 HP. That should get some responce. By the way, the boat is a 18' Marktwain. Any thoughts. Gota go.
    Not sure how the 290 HP number was arrived at ? , even the low compression version typically made more power than that , re the Holley , a 750 DFDP would alway be an improvemnet over the QJ IMO Tom

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    Default hardin 455

    Thanks Tom. The book refers to it as 295 w/ Rochester, 325/ holley and 345/ holley. Thoughts on pointless ignigition?

    Ron

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    Default GM points

    Quote Originally Posted by slimbones View Post
    Thanks Tom. The book refers to it as 295 w/ Rochester, 325/ holley and 345/ holley. Thoughts on pointless ignigition?

    Ron
    I run an Olds with a GM point type distributor. I did mess with the weights and springs to dial in the timing curve but it works great... I do have a Mallory Unilite electronic for an Olds... Looks new, $125. + the shipping.... You can also use a GM HEI and just tweek it a bit for your application... I use the points because I can usually fix anything on the water that goes wrong with the simple system... Parts are cheap, so it's inexpensive to carry spares.....
    Ray
    LOUD BOATS SAVE LIVES

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    Default HArdid 455

    Thanks Ray. There is a Mallory YL501 on it now. Just thought cost and time would lead to a pointless system. They, Hot Spark, and some wrenches I know swear by them. But your right about a fix on the water.

    Ron

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    Any engine from GM that has a Q jet VS a Holley, and has a BIG HP difference, has much much more than a simple carb change. There is a HUGE difference between a 454, 327 or 350 chevy with a Q jet VS a Holley. Same with an Olds. There is no carb in the world that is going to gain you 35-55 HP over a Qjet. Even if you change the manifold.

    Will the Holley gain you a little, Sure. But don't expect anything near the numbers you posted.



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    Last edited by gn7; 08-31-2012 at 07:14 PM.

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    Senior Member jetboatperformance's Avatar
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    Heres a decal taken from an all origninal Spectra 20' this boat has been comming to JBP for 10years and is all origninal, has a Qjet

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    Quote Originally Posted by jetboatperformance View Post
    Heres a decal taken from an all origninal Spectra 20' this boat has been comming to JBP for 10years and is all origninal, has a Qjet
    Did any Hardin Marine engines come with a Holley?
    The point I was trying to make to the OP is that the carb alone has NOTHING to do with the HP rating. W-3X Oldsmobiles all had Q Jets to my knowledge.
    Any thought of some significant HP gain from a switch to a Holley is folley. The Q jet is a much better fueler than many give it credit for. Specially under 400 HP.



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    Hell. O-Jet a good carb. Ford even used them on their hi-po engines.
    No Fool Like A Old Fool is there?

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    gn7
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    Quote Originally Posted by EVILFORCE View Post
    Hell. O-Jet a good carb. Ford even used them on their hi-po engines.
    Care to point out which hi po Fords you think were equipped with Q Jets?
    Or any Ford for that matter.



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    Last edited by gn7; 08-31-2012 at 10:37 PM.

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    Quote Originally Posted by gn7 View Post
    Care to point out which hi po Fords you think were equipped with Q Jets?
    Or any Ford for that matter.
    First one comes to mind was in 1970-71. Cobra-Jet 429. Boss 302. There were a few others. Mach 1 Boss 429.
    No Fool Like A Old Fool is there?

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    Boss and CJ and SCJ motors had Holleys.
    ANY so called HI PO FORD that was not equipped with a Holley, had a Motorcraft carb.


    Although Ford did not use these on any "hi po" engines pre 71, you aren't confusing this for a Q jet are you Evil?




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    Last edited by gn7; 08-31-2012 at 11:01 PM.

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    Quote Originally Posted by gn7 View Post
    Boss and CJ and SCJ motors had Holleys.
    ANY so called HI PO FORD that was not equipped with a Holley, had a Motorcraft carb.

    Thry this. It came from The Ford 429 Engine
    In 1970 the 428 Cobra Jet Motor was replaced with a 429 CJ engine. The change occurred in the middle of the production year so some early Cobra Jet cars had 428's, later cars were 429's. The 429 Cobra Jet package included:

    • Bigger heads with larger ports and valves
    • Stamped steel rocker arms
    • Screw-in rocker studs in the early 70 models
    • Guide plates like used in the Boss 302's
    • Compression was increased from 10.5:1 to 11.3:1
    • Cast iron intake manifold
    • Single 700 cfm Rochester carb
    • Rated at 370 horse power
    No Fool Like A Old Fool is there?

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    No Fool Like A Old Fool is there?

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