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Stroker Question??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Chili 87 K5, Sep 25, 2000.

  1. Chili 87 K5

    Chili 87 K5 Registered Member

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    I know that with a 350 ci block that is 030 overbore, your crankshaft throw length has to be 3.75" to make 383 ci.

    My question is: is it theoretically better to have a bigger crank (like from a 396/402) ground down, or to line-bore the block's main journals to accomodate the larger crank?

    Also; what vehicles had the 396/402 installed as OE?

    Let's hear it, crankmeisters!

    Brian 'Chili' G.
     
  2. blazer72

    blazer72 1/2 ton status

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    one little thing there the 396/402 is a big block stokers are 350 small block running a 400 small block crank. And know you can bring the size the block to fit the crank. Just turn down the crank by .200th to fit in the 350 block and then run the 400 small block crank, harmonic, flywheel and rods. I kill them that turn down good 400 cranks!!!!! Please get an aftermarkit or or a 400 that cant be used in the 400 block any more!

    I understand the jeep thing I drive a BLAZER!!

    Ken
     
  3. Zepplin

    Zepplin 1/2 ton status

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    As far as the 396/402 here are a few OE applications:
    Chevy Trucks; 1966-72 for the 396 and 1970-72 for the 402. I am not sure what vehicles they put these engines in for passenger cars though but, the years are similar to the trucks. My friend had a 69 Blazer that said it orginally came with a 396. My brother is selling his 84 Blazer and he has a 402 in it. Do you need another Blazer?

    Dazed and Confused in a 74 Blazer


    ZEPPELIN
     
  4. blazer72

    blazer72 1/2 ton status

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    Zepplin if your brother has a 402 in his 84 some one put it there. I have never seen a listing for an OEM big block in a blazer. the 400 small block was in them from some time around 1974 till 1980, which is when the 400 prodution stop. The 402/396 (402 is a 396 with .060 over bore) went away some time in the early 70s and just the 454 big block was made for years. The 502 is Gen5 big block and though it been made for the last 8 or 9 years it was only found in marine or heavy eq. There is a Gen5 454 too.

    By 84 the 400 sb and the 402 had both stop being made!

    I understand the jeep thing I drive a BLAZER!!

    Ken
     
  5. Zepplin

    Zepplin 1/2 ton status

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    Yeah, I know it is not a stock motor in my brother's ride. I just thought that I would mention that he has one and he is looking to sell it. But, thanks for the response.

    Dazed and Confused in a 74 Blazer

    ZEPPELIN
     
  6. ken

    ken 1/2 ton status

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    OK, to further clarify all the errors being flailed around here...Chev 396 was produced from 1965-1969; Chev 402 was 1970-1972 and was a .031" overbored 396 (396=4.094" bore; 402=4.125" bore), Chev 427 1966-1969; Chev 454 1970-1991 (Mark IV). Donovan, anything to add?

    ken
     
  7. blazer72

    blazer72 1/2 ton status

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    Ken
    Was the 402 really just an GM mess up or not? I had always read that it was a 396 that was 60 over but never had one and never did the math as for the 454 mark 4 I dont remember the real way to tell the 4 from the 5 other than some say that it the lack of a fuelpomp boss on the mark 5 or gen 5 depending one which sorce you look under, Also is not the 454 still made today as a mark V/gen5?


    I understand the jeep thing I drive a BLAZER!!

    Ken
     
  8. ken

    ken 1/2 ton status

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    I can't swear to it, but I believe GM created the 402 to comply with the ever tightening emissions standards back in the late 60s-early 70s. The 402 with a .031" overbore and open chambered heads burned cleaner than the previous 396s with their closed chamber heads. The 454 and 502 are still being made as a Gen 5 (Mark V), just look in any decent new power boat.

    ken
     
  9. I sold my boat two years ago,it had a stroked 502.It was a 4.5" bore with 4.25 stroke = 540 cid.Bad ass motor!!It was in a 1992 scarab 1 27' long.It was a solid roller motor,dart heads and intake and a 1050 dominator!
    108 mph said the stalker radar gun!!!Had a bad couple of years and had to sell it,damn I miss that boat.100 gallon tank + good gas + only lasted about 4 to 5 hours of fun =
    had to sell boat!

    IF IT AINT BIG IT AINT BAD!!!!!!
     
  10. fr8train

    fr8train 1/2 ton status

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    Your boat wasnt white hull with a blue semi scallop was it? My uncle bought a smaller SCARAB to match his big one 1.5-2 yrs ago. Had the same motor set-up, he put in a FI system in last winter. Now it'll keep with our Fountain boat has a run time of about 6 hours, 7 if you are at 3/4 throttle with your autotrim set up.
     
  11. It had ablue and pink stripe up the sides and rapped across the motor cover,also had a small wing on back.Had hydrolic steering and hill drve shower.Also had K-Planes and morice controls with gafrig gages.

    IF IT AINT BIG IT AINT BAD!!!!!!
     
  12. ken

    ken 1/2 ton status

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    Tell me the thing had a big-a$$ed blower on it, cause to go 108 MPH on a single in a 27' V-bottom boat is next to impossible.

    ken
     
  13. Its only a 25' boat they include the swim deck into the number so it sounds longer.A SCARABB 1 only has 22deg. of dead rise and the hall is'nt as deep.The motor dynoed at
    786hp at 6400 rpm's.And yes it could do it!!!The hall was blue printed,had a stern jack and a 27 pitch custom quiksilver prop.Tell me Ken you full with boats much?
    I've seen more than 20 boats with no blowers in the low 100's.

    IF IT AINT BIG IT AINT BAD!!!!!!
     

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