Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 

Thread: how many rpms can a 350 turn?
          
   
   

Reply To Thread
Results 1 to 12 of 12
  1. #1
    bigbeebe is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2005
    Location
    corry
    Car Year, Make, Model: 78 chevy half ton
    Posts
    7

    how many rpms can a 350 turn?

     



    Hello my name is mike and im building a 350 for a pulling truck. only one problemi have a small budget. i have a set of 906 vortec heads that i picked up and am having puched to 2.02/1.60 and ned to figure out how many rpms i can turn with a stock bottom end 4 bolt main? if you can help me i would greatly appreciate it, also if you know of any discount suppliers of engine parts that would help alot too!!

  2. #2
    TravisB's Avatar
    TravisB is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2005
    Location
    NW Arkansas
    Car Year, Make, Model: 1962 ChevyII,1964 MalibuSS,1966 Chevelle
    Posts
    118

    Those heads won't flow a whole past 6000 rpm so there will be no need to turn it harder than that! I wouldn't trust the stock bottom end much over 6000 anyway! Would it do it yes for how long who knows???

  3. #3
    robot's Avatar
    robot is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2004
    Location
    Tucson
    Car Year, Make, Model: 39 Ford Deluxe Coupe
    Posts
    2,146

    To quote Travis on many of his replies....."why?"

    Wouldnt you want the engine to run at the torque peak when you are pulling? That is not necessarily max rpm.

    mike in tucson

  4. #4
    bigbeebe is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2005
    Location
    corry
    Car Year, Make, Model: 78 chevy half ton
    Posts
    7

    thanks for the info,
    it sounds kinda wierd but you dont want to run at peak torque. it took me while to understand it but, wheel speed plays a huge part of the pulling momentum and you are spinning the tires the whole way down and if the tires start to hook up you want the motor to still pull hard at the higher rpm to mainttain the wheel speed,thus more momentum ( my uncle is huge in to dodge truck pulling) when selecting the cam im going to use i am going to get as much torque as possible along with hp

  5. #5
    71nova's Avatar
    71nova is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2003
    Location
    ohio
    Car Year, Make, Model: 71 Chevy Nova
    Posts
    175

    I have turned 7200 rpms consistently with a 350 that i have, 2 bolt main, no main studs, stock crank, scat rods with arp bolts. The motor has been together for 3 years and is on the stand now still intact, just gonna freshen it up. It has seen 7600 several times and has hit 8 at least 5 times. I think people underrate the strength of a properly maintained and well put together motor.

  6. #6
    dr_bowtie's Avatar
    dr_bowtie is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2005
    Location
    Elkhart
    Car Year, Make, Model: 1957 chevy Belair
    Posts
    316

    71 nova...

    sure you can do all that....if the engine actually made power there it wouldn't live long.....your probably peeking around 6000rpm....If your TRUE power range is 4500-7500 the stock parts would not live long....

  7. #7
    71nova's Avatar
    71nova is offline CHR Member Visit my Photo Gallery
    Join Date
    Aug 2003
    Location
    ohio
    Car Year, Make, Model: 71 Chevy Nova
    Posts
    175

    Too many variables to argue about, with good rods i think a stock crank could hold 7k. BUt it all depends on so many things......cam, heads, valvetrain, balancing, etc.

    Regardless....good luck on this motor.

  8. #8
    dr_bowtie's Avatar
    dr_bowtie is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2005
    Location
    Elkhart
    Car Year, Make, Model: 1957 chevy Belair
    Posts
    316

    in a normally aspirated motor in bone stock form the rod is the weakest link.....I am sure the crank could holds it's own too 7,000+ rpms depending on circumstance.....

  9. #9
    tirekicker is offline Registered User Visit my Photo Gallery
    Join Date
    Mar 2005
    Location
    Cleveland
    Car Year, Make, Model: 66 F-100 Pick up Step Side
    Posts
    2

    350 RPM'S

     



    The 2.02 will kick in at 6,000 rpm's where the 1.94 left off. There is an unanswered question that should be asked. What does this truck weigh anyhow? I mean if you're lugging around 3800 lbs with 33 in. tires, I'd be thinking about a 400 crank to build a little more torque. At any rate try to keep your reciprocating weight down,(ie rims & tire wieght, driveshaft, etc.)
    Good luck.

    tirekicker

  10. #10
    sparky2263's Avatar
    sparky2263 is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2005
    Location
    Keystone Heights
    Car Year, Make, Model: 65 'vette, 04 GTO, 92 4.3 Blazer
    Posts
    140

    The 170cc intake runners are gonna do you in before the 2.02 valves are gonna do you much good. The 906 head is great for building torque but starts to peter out around 5500 and is all done by 6200.
    http://www.cardomain.com/memberpage/647081

  11. #11
    bigbeebe is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2005
    Location
    corry
    Car Year, Make, Model: 78 chevy half ton
    Posts
    7

    thanks agian for the help. i was thinking the same about the heads and 170 cc runners hidering me but for now im trying to keep cost dwn untill i get my chassis and drivline ( except motor) setup the way i want it. in the end i'm going to have these heads potedand polished and what ever it takes to get them to flo what i need.adn have a 400 or 383 stroker rotating assembly running about 7500-8000 rpms max but thats a couple years down the road.
    the truck will wiegh ina t 5600 lbs i will be pulling in the 5200 wiehgt class but since i am using a small block i am allowed up to 400 lbs extra. i think itts actually an advantage. usually you runn out of traction way before you do power.
    once agin thanks

  12. #12
    Dans72 is offline CHR Member Visit my Photo Gallery
    Join Date
    Mar 2005
    Location
    Rosamond
    Posts
    10

    Yes!

Reply To Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink