Specs on reman target 350

Discussion in 'Engine Topic' started by Sir 4 speed, Mar 7, 2012.

  1. Sir 4 speed

    Sir 4 speed Veteran Member

    329
    0
    Feb 23, 2011
    spfld ma
    I was reading online that the GM target master crate motors came with 275 horse can anyone help me with the specs on these motors, tourqe and horsepower.

    Thank you in advance
     
  2. ls777z

    ls777z Veteran Member

    2,075
    0
    Feb 19, 2000
    Clay,NY
    Have you checked at a Chevrolet dealer ? Seems they would have all the information you're looking for. I know a GM crate 350 I was looking at a few years ago was 290 hp.
     
  3. Todd80Z28

    Todd80Z28 Moderator Staff Member Lifetime Gold Member

    10,849
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    Jun 11, 2002
    Northern VA
    The TargetMaster/Goodwrench 350 was basically a clone of the LM1 350 from the 77-80 era, with slightly different heads. GM rated them at 250-260 hp.

    4 Bolt main block
    76cc 993 iron heads (similar to 882 castings, IIRC)
    12cc cast dished pistons
    The old -929 hydraulic cam, .390/.410 lift
    Nominal 8.5:1 compression, probably closer to 8.2:1 in reality

    That's about it. I put one in a '70 SS350 years ago, and it ran OK. Certainly better than that oil burner that was in it before.:)

    The 290hp version that's currently selling is the same engine, but with the L82 cam (.450/.460). I'm a little skeptical that those are real HP numbers.
     
  4. Sir 4 speed

    Sir 4 speed Veteran Member

    329
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    Feb 23, 2011
    spfld ma
    Yea I was thinking the same when I saw that it said 275 hp I thought to myself "not bad, that will be fine till next winter" ( when I can tear it down and build it) thank you for all that help and information.
     
  5. Damon

    Damon Veteran Member

    12,924
    13
    Nov 16, 2000
    Philly area
    Are they calling it 275HP now? It's like "horsepower inflation" over the years with that engine. Years back, it was rated 205HP. Then 225HP. Then 250. Then 260. And now 275, I guess.

    The engine is the same as it ever was. Just the test conditions under which they rated it changed. OK, to be fair, they probably changed to low tension metric rings in the engine at some point, but that certainly doesn't explain the "explosion" in power rating over the years.
     
  6. Twisted_Metal

    Twisted_Metal Moderator Staff Member Lifetime Gold Member

    25,270
    286
    Feb 26, 2004
    Bloomington, MN
    It's a 4-bolt main engine, made in Mexico... All new parts.
    (Not remanufactured.)

    Good engine for a driver.. Not much for performance.
    I put one in my car four years ago.
    It's better than the 305 it replaced but nothing to brag about for power.

    It comes with a three-year warranty and it's a solid base to build up.
    With a swap to Vortec heads and you can probably reach their claimed HP numbers.
     
  7. marlin

    marlin Veteran Member

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    Oct 27, 2009
    Wantagh, NY
  8. Damon

    Damon Veteran Member

    12,924
    13
    Nov 16, 2000
    Philly area
    Yeah, metric horsepower. That's gotta be it.

    I think they just resorted to some old "magazine tricks" in how they rate it. Optimized tune on a 4bbl carb and distributor, aftermarket intake, no front end accessories (not even water pump), open headers, only half a sump full of oil and gulping 35* dry air in the dyno cell!!

    You know..... exactly like it would be under the hood of your Camaro. ;)
     
  9. Todd80Z28

    Todd80Z28 Moderator Staff Member Lifetime Gold Member

    10,849
    11
    Jun 11, 2002
    Northern VA
    I got low-14s out of the Goodwrench engine with a 3.36 peg leg and 205/70-14s on the '70, so it may have been underrated back then (installed '92, tested '93, I think...:screwup: ). I don't think 205hp would have carried me that fast. I had Holley 600VS and headers, typical stuff, yadda yadda...
     
  10. Damon

    Damon Veteran Member

    12,924
    13
    Nov 16, 2000
    Philly area
    I personally think the 250HP rating was about right for a 4bbl, aftermarket dual plane intake, headers/dual exhaust and an open element air cleaner. If tuned pretty sharp. I've used them several times to replace worn out stock 305s and they are certainly a big improvement over an old LG4 305!!

    When they carried the 205HP rating I believe they used a cast iron QJet intake and exhaust manifolds with full factory single exhaust. That's a very different combo that how they set it up to get the 250HP rating. The later 260 and now 275HP ratings just seem to be tugging at the truth a bit, in my opinion.

    If you pull a Vortec 350 out of a truck, drop a carb on it and plunk it down between the fenders of your Camaro it will go noticably faster than the Targetmaster engine (same exhaust an accessories on both). The Vortec motor was likewise rated about 275HP from the factory, if memory serves. But that was an a factory as-installed 275HP (through factory intake and exhaust, spinning full accessories). Just wanted to give you a reference point for how far they had to bend over backwards to rate the lowly Targetmaster engine the equal of a factory-installed Vortec engine.
     

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