Announcement Announcement Module
Collapse
No announcement yet.
How much rpm and hp can a 400 small block handle? Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts

  • How much rpm and hp can a 400 small block handle?

    I have a 400 chevy 4 bolt main(weaker than 2 bolt) that has been rebuilt 30 over mabey 1,000 miles ago. How much power can this thing handle with stock internals. I want to build a low budget sleeper for my 75 nova 4dr and looking between 400hp and 500hp.

  • #2

    Re: How much rpm and hp can a 400 small block handle?

    Re: How much rpm and hp can a 400 small block handle?

    500hp should be possible, if not easy, with the right heads and cam.

    Comment


    • #3

      Re: How much rpm and hp can a 400 small block handle?

      Re: How much rpm and hp can a 400 small block handle?

      i have a z28 140 off road solid mech cam int .494 adv 304? .50 257 .Im not sure what heads to run though i have a set of world s/r or a set of 882 both have been pocket ported and have 2.02's, but i also for the price of having those redone i can get a set of afr 195 that are ready to go but im just worried it will be too much power for the stock internals. I also am going to run an air gap and a 750 duble pumper that i have.

      Comment


      • #4

        Re: How much rpm and hp can a 400 small block handle?

        Re: How much rpm and hp can a 400 small block handle?

        Grind the parting lines on the rods, and polish them,
        plus replacing the rod bolts w/ ARP rod bolts,
        and maybe some ARP main cap bols. Cheap insurance.

        After grinding and polishing you may need a balance job,
        but that should be checked anyway if you replace pistons.

        If not, you should still have it checked.

        Comment


        • #5

          Re: How much rpm and hp can a 400 small block handle?

          Re: How much rpm and hp can a 400 small block handle?

          Do you think bolts will be ok or should i go with studs, i want to do this really cheap, ?. Also i have heard about half filling it with block filler for extra strength is it worth it. I really want to cruise it around and flog it every once in awhile.

          Comment


          • #6

            Re: How much rpm and hp can a 400 small block handle?

            Re: How much rpm and hp can a 400 small block handle?

            Do you think bolts will be ok or should i go with studs, i want to do this really cheap, ?. Also i have heard about half filling it with block filler for extra strength is it worth it. I really want to cruise it around and flog it every once in awhile.

            I'd stud it, but that may require having it align bored/honed.
            Depends on how much you got to spend.

            Comment


            • #7

              Re: How much rpm and hp can a 400 small block handle?

              Re: How much rpm and hp can a 400 small block handle?

              This is going to be super cheap deal i really dont want to even take apart the bottem end. I think ill just get some good ARP bolts and forget the filler.

              Comment


              • #8

                Re: How much rpm and hp can a 400 small block handle?

                Re: How much rpm and hp can a 400 small block handle?

                Do you think bolts will be ok or should i go with studs, i want to do this really cheap, ?. Also i have heard about half filling it with block filler for extra strength is it worth it. I really want to cruise it around and flog it every once in awhile.
                Forget he block fill you won't need it. And you want to get as much cooling as you can with a 400. As for bolt or studs depends on the price, I like studs, and if it's a few dollars more I'd go with them over the bolts.

                As for power I'd say your safe at 500hp.

                Go with the AFR's they'll make that 500hp goal a lot easier.

                Other than that I agree with Min301 on polishing the parting lines on the rods, it's just cheap insurance.

                Comment


                • #9

                  Re: How much rpm and hp can a 400 small block handle?

                  Re: How much rpm and hp can a 400 small block handle?

                  500 in a 400 should be easy
                  seen sbc with aluminum rods and light pistons shift at 12,000 rpm

                  Comment


                  • #10

                    Re: How much rpm and hp can a 400 small block handle?

                    Re: How much rpm and hp can a 400 small block handle?

                    Grind the parting lines on the rods, and polish them,
                    plus replacing the rod bolts w/ ARP rod bolts,
                    and maybe some ARP main cap bols. Cheap insurance.

                    After grinding and polishing you may need a balance job,
                    but that should be checked anyway if you replace pistons.

                    If not, you should still have it checked.
                    x2
                    we do a bunch of budget stuff this way "the devil is in the details" good hardware clean polish leave nothing untouched lol
                    the rods are strong just short
                    if it is a 406 or will be step up to a 5.7 rod it will wake it up over the 5.56 rod
                    let it breath is the keygood intake heads and cam just like any other engine
                    the lower will hold up with "factory"parts
                    my 400 i never fill and they always run around 195 temp wise even my 454 sbc runs cold temp will kill a 400 easy
                    my 440 was a 2 bolt with all the fun stuff my 454 was a 4 bolt 400 that is studded billet main caps and a girdle because it is the weaker block been in the car for bout 10000 miles so far and i punish it

                    Comment


                    • #11

                      Re: How much rpm and hp can a 400 small block handle?

                      Re: How much rpm and hp can a 400 small block handle?

                      When I saterted working for VanPeenan, he had built a 406 of Ron Heeney
                      a few years prior. That was 15yrs ago, and that same motor is still in use,
                      though has been freshened a time or two.

                      I agree on the 5.7 rods, though that will bump up the price for balancing,
                      and require the use of new pistons(not a bad thing).

                      Comment


                      • #12

                        Re: How much rpm and hp can a 400 small block handle?

                        Re: How much rpm and hp can a 400 small block handle?

                        When I saterted working for VanPeenan, he had built a 406 of Ron Heeney
                        a few years prior. That was 15yrs ago, and that same motor is still in use,
                        though has been freshened a time or two.

                        I agree on the 5.7 rods, though that will bump up the price for balancing,
                        and require the use of new pistons(not a bad thing).

                        Don't think you need 5.7 rods, remember the stock rod is only .14 shorter, which is only about an 1/8 of an inch. Fact is you'll make more low end torque with the stock 400 rods with a little sacrifice to top end HP. Same thing goes for the 6 inch rod but in reverse, it'll make a little more top end power at the sacrifice of low end torque. As for the 5.7 rod it's in the middle making more torque than the 6 inch rod and more HP than the stock 400 rod.

                        Hot Rod or Car Craft did a shootout on the three rods and the 5.7 was best all around.

                        Comment


                        • #13

                          Re: How much rpm and hp can a 400 small block handle?

                          Re: How much rpm and hp can a 400 small block handle?

                          not saying you need a 5.7 rod my first 2 406's were stock rods the 5.7 is a nice upgrade though

                          Comment


                          • #14

                            Re: How much rpm and hp can a 400 small block handle?

                            Re: How much rpm and hp can a 400 small block handle?

                            Ill take the MIN advice and just polish the stock ones save myself some $. Im only looking at maybe 550hp at most, but i do have a nitrous kit but i dont think the stock 30 over pistons will handle that. Here is another question i have ran into from reading forums is not to use a high volume oil pump with a stock pan or it will suck the pan dry and cause damage. Any one have thoughts on that should i just get a good stock melling pump?

                            Comment


                            • #15

                              Re: How much rpm and hp can a 400 small block handle?

                              Re: How much rpm and hp can a 400 small block handle?

                              Ill take the MIN advice and just polish the stock ones save myself some $. Im only looking at maybe 550hp at most, but i do have a nitrous kit but i dont think the stock 30 over pistons will handle that. Here is another question i have ran into from reading forums is not to use a high volume oil pump with a stock pan or it will suck the pan dry and cause damage. Any one have thoughts on that should i just get a good stock melling pump?

                              Stock Melling, with a good pickup(retained), good oil pan and/or a windage tray should be all you need.

                              Comment


                              • #16

                                Re: How much rpm and hp can a 400 small block handle?

                                Re: How much rpm and hp can a 400 small block handle?

                                I think the block will handle the 500 hp goal. Like others said, get ARP rod and main bolts or studs. You could spend $1500 on those 882's and they still won't flow like those AFR's. I believe if you want 500 hp without nitrous, go with the AFR's.

                                I have a HV Melling pump in my stock pan. It hasn't sucked it dry yet. If you're worried, over fill it by 1/2 a quart for racing. I did that a lot when going on long road trips when I cruised at 3500 rpm.
                                BS'er formally known as Rebeldryver

                                Resident Instigator

                                sigpic

                                Comment


                                • #17

                                  Re: How much rpm and hp can a 400 small block handle?

                                  Re: How much rpm and hp can a 400 small block handle?

                                  my experience - the 406 I just blew up was where I found the limit - and what surprised me is where that weakness is... not the rods, crank, or even pistons... but the siamese bore got too hot and it blew a hole through them at the head gasket..... the hp was 700 with the B&M blower on it... although, even hurt it was 400 hp and 500 lbs torque (6 cylinders working).
                                  Too cold, you'll split the water jacket (did that too), too hot or hotspots (882 heads) and it'll bore a hole between the cylinders.
                                  It only takes one aweshit to erase a dozen attaboys

                                  Comment


                                  • #18

                                    Re: How much rpm and hp can a 400 small block handle?

                                    Re: How much rpm and hp can a 400 small block handle?

                                    BLOWERS SHOULD RUN O RINGED CYL HEADS AND COPPER GASKETS
                                    and a bow tie block or equivilent

                                    Comment


                                    • #19

                                      Re: How much rpm and hp can a 400 small block handle?

                                      Re: How much rpm and hp can a 400 small block handle?

                                      I have 400 I just cant kill it, was a 2 bolt to start its been over 750 and 8.30s before as a single four motor "ALL MOTOR" set up, its been a Dirt Mod motor twice, it was a 393 I think, then a 625 HP Drag Week N/A Motor. and a Pump Gas Drags Motor twice. I am Gutting it and using the Rototating assembly out of it for this years Drag Week.

                                      It will go back in the corner till its needed again, its not failed me yet over 9000 RPM before "by mistake" unloaded 8500 in the lights.

                                      Done right they will live,,,, till they dont, I just hate not using it best block I have ever had but 8 lives are gone I know
                                      2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
                                      First to run in the .90s .80s and .70's in SBN/A
                                      2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
                                      2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!

                                      Comment


                                      • #20

                                        Re: How much rpm and hp can a 400 small block handle?

                                        Re: How much rpm and hp can a 400 small block handle?

                                        BLOWERS SHOULD RUN O RINGED CYL HEADS AND COPPER GASKETS
                                        and a bow tie block or equivilent
                                        the max the little blower could make was 9 lbs of boost so I figured it didn't matter : oh well, a $400 bottom end - no real loss ;D

                                        it's also one of those factors in my thoughts of LS power
                                        It only takes one aweshit to erase a dozen attaboys

                                        Comment

                                        Working...
                                        X