Page 1 of 2 12 LastLast
Results 1 to 20 of 21

Thread: 406ci BHP? Other questions

  1. #1

    406ci BHP? Other questions

    Sorry to sound an idiot but Iím new to this forum and the American car scene and wondered if anyone could answer a Question to broaden my knowledge.

    found a Chevy with a 406ci 6.6l small block, wondered what the BHP would roughly be running a manual 4 speed box.

    cheers.

  2. #2
    NSRA member
    Join Date
    Jun 2003
    Posts
    3,638
    Images
    2
    406 is I think a 400 block with 350 crank - I really should know for sure as I have one, oops! They're stroker motors and produce oodles of torque, at the expense of a few rpm's. The output will depend massively on the heads, cam etc and the only real way to get a number is on a dyno. Whatever the number you have, with a manual trans you'll have a smile on your face, assuming a not too heavyweight car.

    Chris
    Bumper sticker - This is an historic vehicle and only has three speeds....... if you don't like this one you sure as hell won't like the others.

  3. #3
    Quote Originally Posted by Happydaze View Post
    406 is I think a 400 block with 350 crank - I really should know for sure as I have one, oops! They're stroker motors and produce oodles of torque, at the expense of a few rpm's. The output will depend massively on the heads, cam etc and the only real way to get a number is on a dyno. Whatever the number you have, with a manual trans you'll have a smile on your face, assuming a not too heavyweight car.

    Chris
    Nice one cheers for that itís a 69 camaro originally a 327 bored out to a 406 is all I know so roughy you reckon the BHP might be????

  4. #4
    NSRA member kapri's Avatar
    Join Date
    Jun 2003
    Posts
    25,197
    I'm guesiing you are young from your need to have bragging rights to a million bhp ? Tell your mates whatever impresses them .

    Without an actual dyno sheet it's all a urinating contest.
    Last edited by kapri; 26-08-19 at 10:55 AM.
    Galations 6:7

  5. #5
    NSRA member Dusty's Avatar
    Join Date
    Jun 2005
    Posts
    1,627
    Images
    1
    Quote Originally Posted by kapri View Post
    I'm guesiing you are young from your need to have bragging rights to a million bhp ? Tell your mates whatever impresses them .

    Without an actual dyno sheet it's all a urinating contest.
    That pretty much sums it up.
    Crew Chief 'Miss-Guided' Drag Car... Super Pro ET 7245
    Lohrspeed Vehicle Transport and Recovery 07502 292116

    My Intro

  6. #6
    Well Iím not afraid to admit my lack of knowledge when it comes to these vehicles and young hmmmm 42 this year but I come from a back ground of retro fords so I am pretty green to these sort of vehicles so yes I have a lot to learn as Iíve been told by a few people but if I dont ask Iíll never know will I?.

    A Dyno is definately the way to conclude a definite figure I get that just didnít know if any one had a rough idea that was all and as for bragging rights, not at all I just like to know things as all the cubic inch bhp torque etc seems totally different on American stuff to what I am used too so sorry for putting my head above the parapet.

  7. #7
    Moderator Brizey's Avatar
    Join Date
    Nov 2003
    Posts
    8,307
    Images
    10
    Don't apologise Stuart, we all had to start somewhere and ask questions as we went whatever our knowledge level is today!!.

    Guesstimating things like HP or engine torque is just that...a guess, which doesn`t really answer the question. From what I gather the standard 327 is 210hp, while the factory option was 275hp. Yours would depend on what motor you have + the overbore. I would guess (and that's all it is) that yours would be somewhere in between those above figures. As said, the only way of really knowing is a dyno run.

    Hope you find the info your after sometime!...
    "The older i get, the faster i was".
    Out to pasture ...
    My Intro My Rods

  8. #8
    NSRA member kapri's Avatar
    Join Date
    Jun 2003
    Posts
    25,197
    Sorry ( ), you're NOT that young but the Retro Ford background does explain the bhp fixation A V8 is a totally different animal to a highly tuned 4 pot. Also what it is in dicates how you can use it and what is the likley performance. On the street torque is king and the V8 has bucket loads .

    Lets try another way , WHY do you need to know the bhp and how do you intend using it ?That info would enable us to tell you what you need to be looking for in way of engine spec . Bear in mind that a Yank car ( except rods) tend to weigt twice what an RetroFord does hence the need for torque over bhp. You may expect a certain level of performance from a certain bhp level based on your retroford experience but that simply doesn't translate .

    What attracted you to this side of stuff ie vehicle style , noise, speed , burnouts , drag racing ?

    Are you just looking for something powerful and don't really care what it's fitted in ?
    Last edited by kapri; 26-08-19 at 01:52 PM.
    Galations 6:7

  9. #9
    NSRA Committee
    Join Date
    Jul 2003
    Posts
    5,019
    Quote Originally Posted by Happydaze View Post
    406 is I think a 400 block with 350 crank - I really should know for sure as I have one, oops! They're stroker motors and produce oodles of torque, at the expense of a few rpm's. The output will depend massively on the heads, cam etc and the only real way to get a number is on a dyno. Whatever the number you have, with a manual trans you'll have a smile on your face, assuming a not too heavyweight car.

    Chris
    Can't swear to it but I thought a 400 block with a 350 crank was a 383?

  10. #10
    Quote Originally Posted by kapri View Post
    Sorry ( ), you're NOT that young but the Retro Ford background does explain the bhp fixation A V8 is a totally different animal to a highly tuned 4 pot. Also what it is in dicates how you can use it and what is the likley performance. On the street torque is king and the V8 has bucket loads .

    Lets try another way , WHY do you need to know the bhp and how do you intend using it ?That info would enable us to tell you what you need to be looking for in way of engine spec . Bear in mind that a Yank car ( except rods) tend to weigt twice what an RetroFord does hence the need for torque over bhp. You may expect a certain level of performance from a certain bhp level based on your retroford experience but that simply doesn't translate .

    What attracted you to this side of stuff ie vehicle style , noise, speed , burnouts , drag racing ?

    Are you just looking for something powerful and don't really care what it's fitted in ?
    may be a I am a little out of my depth here in all this but itís just strange that such a large engine produces a a lesser output BHP wise but I also understand about the V8 being all about torque and this is what really floats my boat.

    like many I grew up in an era of all the classic US tv shows and films dukes of hazzard, starsky and hutch, smokey and the bandit to name but a few then when I grew up Iíve went out to US a few times too driven across Death Valley, driven the Pacific coast highway, and a good stretch of Route 66 too, I know itís a bit cheesy but never in million years did I think I would be in a position to actually buy one of them but Iíve sold two of my vehicles a mint Defender TD5 and my Escort RS turbo Series one, to allow this dream to come true, Iím not afraid to get on the tools either without having to visit a main dealer which is another great attraction to classic American vehicles so I just hope Iím worthy enough to own one.
    Attached Images Attached Images   

  11. #11
    NSRA member kapri's Avatar
    Join Date
    Jun 2003
    Posts
    25,197
    BHP is all about revs which most v8s don't do as they have no need. Most stockers top out about 4500 / 5000 rpm dependent on age . In the 70s they smog controlled the engines right down and many were incapable of revving past 4000 without much internal work .

    Early engines look impressive on paper but were measured in SAE spec rather than DIN which flattered their actual in car output greatly.

    The difference between bhp and torque is usually described as bhp is about how fast you hit the building and torque is about how far you take the building with you.
    Galations 6:7

  12. #12
    Quote Originally Posted by kapri View Post
    The difference between bhp and torque is usually described as bhp is about how fast you hit the building and torque is about how far you take the building with you.
    I like that terminology now that makes perfect sense thanks 👌🏻😆

  13. #13
    Have a read here, it's all down to the amount of crankshaft offset to get the numbers
    https://www.coasthigh.com/category-s/141000227.htm

  14. #14
    Quote Originally Posted by jsf55 View Post
    Have a read here, it's all down to the amount of crankshaft offset to get the numbers
    https://www.coasthigh.com/category-s/141000227.htm
    nice link thanks for that thereís definately more to all this than meets the eye 👍🏻😳

  15. #15
    NSRA member rem's Avatar
    Join Date
    Jun 2003
    Posts
    6,973
    Images
    1
    Nice looking Camaro. I'm not sure how you would get 406ci from a 327 without a big stroker crank - 400ci smallblocks have a 4-1/8" bore but have siamesed cylinders to enable that. Pretty sure a 327 has a 4" bore, same as a 350 and don't know if you can safely take that an 1/8" over. Maybe it has an over-bored 400 swapped in - if it came from a dealer they may not have the full details of the build anyway? Best thing to do to start with would be to decode the engine number, normally stamped on a pad at the front right of the block, in front of the cylinder head. That should tell you what it started out as.

    And it would be nice to see some pics of the engine
    Sent from my Kitchen Table using a little box full of smoke and dangerous radio waves


    Shine is Fine

  16. #16
    Quote Originally Posted by rem View Post
    Nice looking Camaro. I'm not sure how you would get 406ci from a 327 without a big stroker crank - 400ci smallblocks have a 4-1/8" bore but have siamesed cylinders to enable that. Pretty sure a 327 has a 4" bore, same as a 350 and don't know if you can safely take that an 1/8" over. Maybe it has an over-bored 400 swapped in - if it came from a dealer they may not have the full details of the build anyway? Best thing to do to start with would be to decode the engine number, normally stamped on a pad at the front right of the block, in front of the cylinder head. That should tell you what it started out as.

    And it would be nice to see some pics of the engine
    well Iím going to view on Saturday itís not the one in the picture above thatís from our road trip which we stumbled across near Dallas.

    right well ill get the numbers that I can off of the lump and see what it translates to itís just a load of money to pay out and I like to try and have all bases covered.
    this is the one Iím going to see I know itís been up for sale for a while but we have a bit of a deal going so Iím crossing my fingers 🤞🏻
    Attached Images Attached Images  

  17. #17
    NSRA member
    Join Date
    Jun 2003
    Posts
    3,638
    Images
    2
    That info should surely come from the seller before you go to see the car?

    There's 406's and 406's and they're not born equally. Route 1. Take a chevy 400 block and do some stuff to it that'll inevitably cause problems (overheating etc). Route 2. Take an aftermarket 400 block (eg Dart) and do the stuff and end up with an issue free engine that'll also be rebuildable and with the apparent stock 400 block issues designed out. Route 2 hasn't been around for that long by virtue of the aftermarket block availability. Not sure if 406 is achievable without a 400 block (350 with a 155 thou overbore?). 350 block with 400 crank gets 383 iirc. I think a 400 with a 30 thou overbore gets 406.

    If it were me it would be up to the seller to prove to my satisfaction the proper specification of the motor as otherwise i'd be viewing it as no more than a £1500 stock replacement (but that would come with a warranty).

    Or just go at it with a £5 to £10k (??) provision in mind for a good motor? btw high 400's+ hp is readily achievable from a not crazy 406.

    Chris
    Bumper sticker - This is an historic vehicle and only has three speeds....... if you don't like this one you sure as hell won't like the others.

  18. #18
    Quote Originally Posted by Happydaze View Post
    That info should surely come from the seller before you go to see the car?

    There's 406's and 406's and they're not born equally. Route 1. Take a chevy 400 block and do some stuff to it that'll inevitably cause problems (overheating etc). Route 2. Take an aftermarket 400 block (eg Dart) and do the stuff and end up with an issue free engine that'll also be rebuildable and with the apparent stock 400 block issues designed out. Route 2 hasn't been around for that long by virtue of the aftermarket block availability. Not sure if 406 is achievable without a 400 block (350 with a 155 thou overbore?). 350 block with 400 crank gets 383 iirc. I think a 400 with a 30 thou overbore gets 406.

    If it were me it would be up to the seller to prove to my satisfaction the proper specification of the motor as otherwise i'd be viewing it as no more than a £1500 stock replacement (but that would come with a warranty).

    Or just go at it with a £5 to £10k (??) provision in mind for a good motor? btw high 400's+ hp is readily achievable from a not crazy 406.

    Chris
    Spot on with the 30 over 400 to get a 406
    It is a small block though isn't it? Folks often confuse the small block 400 with the big block 402 which was a factory over bore of a 396.
    Regards, Neil.

  19. #19
    Quote Originally Posted by Happydaze View Post
    That info should surely come from the seller before you go to see the car?

    There's 406's and 406's and they're not born equally. Route 1. Take a chevy 400 block and do some stuff to it that'll inevitably cause problems (overheating etc). Route 2. Take an aftermarket 400 block (eg Dart) and do the stuff and end up with an issue free engine that'll also be rebuildable and with the apparent stock 400 block issues designed out. Route 2 hasn't been around for that long by virtue of the aftermarket block availability. Not sure if 406 is achievable without a 400 block (350 with a 155 thou overbore?). 350 block with 400 crank gets 383 iirc. I think a 400 with a 30 thou overbore gets 406.

    If it were me it would be up to the seller to prove to my satisfaction the proper specification of the motor as otherwise i'd be viewing it as no more than a £1500 stock replacement (but that would come with a warranty).

    Or just go at it with a £5 to £10k (??) provision in mind for a good motor? btw high 400's+ hp is readily achievable from a not crazy 406.

    Chris
    now I can understand that thank you ‘Happydaze’.
    I know the seller said that a guy in the states contacted him and said that he saw the car was for sale and his friend fitted the crazy engine??? so maybe it is a replacement I don’t know as yet and I doubt he made a note of the guy who contacted him either.
    Last edited by Pistons4life; 27-08-19 at 03:29 PM. Reason: O

  20. #20
    NSRA member rem's Avatar
    Join Date
    Jun 2003
    Posts
    6,973
    Images
    1
    If you're going to view it, try and get to see it start, run and idle nicely from cold. If it is too 'crazy' an engine it might just be too much of a chore to drive and enjoy. White over orange, orange over white - either works for me!
    Sent from my Kitchen Table using a little box full of smoke and dangerous radio waves


    Shine is Fine

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •