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Thread: Need help getting a new engine
          
   
   

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  1. #16
    DennyW is offline CHR Member Visit my Photo Gallery
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    ATK engine, because it is more complete. The compression ratio is more fuel friendly. That is the reason hp is lower. But, you don't have to worry about fuel ratings, and it is more ready to go anywhere without worrying about fuel octane ratings.

    ps: I used to buy ready to go engines from ATK when I had my own shop. Had very good, dependable results from them. And they warranty anything if there is a problem.
    Last edited by DennyW; 10-23-2018 at 08:20 AM.
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  2. #17
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    The 2 engines are pretty much a toss up as far as specs go. You will have so much more power with either one that I doubt you could tell the difference. The cam in the ATK will probably have a slightly broader power band due to the wider lobe seperation, but there again, it's really not going to matter that much. I like the higher compression on the Blueprint engine.

    If the warranties are close, I would go with the most complete engine. On ATK's website, they go into a little better detail about what is actually used to build the engine.

    The ATK will save you from having to source the correct parts to complete the install and will help eliminate hassles if something goes wrong. For instance, if the intake leaks, it's on ATK. They can't say you installed it wrong. Same with the distributor.

    Both companies are "name brands", but that just means they advertise. Doesn't mean anything about quality. I personally have never had any dealings with either one.

    Denny pretty much answered your question. I actually had this reply typed up earlier, but forgot to post it until I came in for lunch.
    Last edited by Hotrod46; 10-23-2018 at 10:48 AM.
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    Mike

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  3. #18
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    I would love to chime in, but all I get from your links is some BS about vigilink.
    Let me warn you about the flexplate. Most everybody is using flexplates from an offshore source (read China) and the thin material will not hold up. Buy an SFI certified flexplate that was meant for drag racing (SFI 29.1) and sidestep the problem.
    .
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  4. #19
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    Quote Originally Posted by techinspector1 View Post
    I would love to chime in, but all I get from your links is some BS about vigilink.
    Let me warn you about the flexplate. Most everybody is using flexplates from an offshore source (read China) and the thin material will not hold up. Buy an SFI certified flexplate that was meant for drag racing (SFI 29.1) and sidestep the problem.
    .
    The forum loads slow today...

    Here you go tech... (AND, ABSOLUTELY what tech said: Buy an SFI certified flexplate that was meant for drag racing (SFI 29.1)
    https://www.viglink.com/opt-out/

    Attachment 70658

    Attachment 70659

    Attachment 70660
    Last edited by DennyW; 10-23-2018 at 12:06 PM.
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  5. #20
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    Thank you Denny.
    .
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  6. #21
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    I probably should add this as well. You didn't say what your rear gears were in the initial post. Both of the engines you listed will be happiest with at least a 3.5 rear gear. More would be better. 3.73 or higher would be a good choice depending on tire diameter.

    That's the problem with increasing cam duration. Contact ATK to find out what cruise RPM's at 60 MPH they recommend. I'm going to guess around 2500.
    Mike

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  7. #22
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    Quote Originally Posted by Hotrod46 View Post
    I probably should add this as well. You didn't say what your rear gears were in the initial post. Both of the engines you listed will be happiest with at least a 3.5 rear gear. More would be better. 3.73 or higher would be a good choice depending on tire diameter.

    That's the problem with increasing cam duration. Contact ATK to find out what cruise RPM's at 60 MPH they recommend. I'm going to guess around 2500.
    I'm not sure about the gear ratio, I think they might be 3.23s if I remember correctly

  8. #23
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    Without the correct gearing, you will not get the benefit of all that advertised HP. If the engine is forced to lug around at low RPM, you will be worse off than with a stock engine. It will feel very sluggish and fuel economy will be terrible. ATK also recommends a higher stall converter than stock. If you don't want to change the gears and converter, you would be better off with a milder engine.

    Depending on your tire size, you might get by with the 3.23's. The cams in both engines are for building power and torque in the midrange to high RPM's. The cam I had in my 383 was milder than the one in the ATK and I barely got by with 3.23's. The 383 is good at making torque, but the cam still programs the power characteristics of the engine.

    Sorry if this sets you back, but you need all the info before spending all your hard earned cash.
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    Mike

    I seldom do anything within the scope of logical reason and calculated cost/benefit, etc-
    I'm following my pass​ion

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