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Buying tranny and engine need info

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Dunc03, May 9, 2002.

  1. Dunc03

    Dunc03 1/2 ton status

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    Location:
    Tyler,Texas
    I'm looking to buy a new tranny and engine. I pretty much know what I want, but I need to know what all parts I will have to get to make the combo work. right now I have a 86 K5 with a 305/700r4/np208 combo. I want to change the engine to a vortec 350 froma a 96 or later. I know the intake is different, but what other parts might I need to make it work. People on here have told me that 305 and 350 parts are not all interchangeable. Plus what will I need to hook the engine up to the 7004r. Is the bellhouseing, flexplate, or torque converter different. THe 86 had the one piece rear main seal so I know that this is not a problem. I knwo you guys know alot more about this stuff than I, so any informatiion is alot of help. IF ya'll don't know the answer(which I doubt), can you direct me to someone or somewhere that does know. Also I have heard that GM sells new trannys, is there any where I can check these things out on line. One last thing is the harmonic balancer the same on these two engines. Thanks for all the help
     
  2. Jay73K20

    Jay73K20 Registered Member

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    Do you plan on sticking with the carb? I would go with the SFI and 4L60E if I did that swap. But if you go carb, swap the intake manifold with EDL 2116, if you have a few extra dollars get the EDL 7116 manifold. Swap the roller cam with GM's hot cam (218/228 duration .492/.492 lift) and the valve springs with GM's LT4 valve springs. Make sure you have a healthy carb like an EDL 1411 and a good set of headers and single 3” exhaust. This combo will shoot you from 245 to the 370-390 HP range. The only reason I say use the Hot cam is because of price ($170) but if you want better low speed torque which will cost you top end HP then buy a comp or crane roller cam ($240) with less duration (not much less, keep it in the 200 to 220 degrees @ .050 range) but still use the LT4 valve springs.

    Every thing bolts up.

    Jason
     
  3. zakk

    zakk 1/2 ton status

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    i really do not think a cam & intake in a 350 will make an extra 130 hp.

    i think 300hp will be within reach, with good tuning and headers, but not 390hp

    people WAAAAYYY overrate HP ratings, and I still don't know why...
     

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