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Author Topic:   chevy 400 sb with a 3.250 crank has anyone tried?
m33mcg
Member
posted August 22, 2004 09:05 PM
I am thinking of building a 4.155 block with a 3.250 crank for a super stock. Our rule are steel block & heads, 360 cid. (chevy & ford) with the 4412 carb. Has any tried this or am I wasting time and money?
Or should I stay with the 355 cid.
The track is 4/10 mile high banked that goes dry slick. Have a g60 tire rule also.
would like help from the pros since i'm a newbe to this class and forum.
Thanks, Mike


2nd2none
Member
posted August 22, 2004 11:29 PM
with the right cam that combo works well, but like any short stroke motor you had better build it well because to get any torque out of it it'll need to see 8500 rpms.


77k
Member
posted August 23, 2004 01:35 AM
I built one using dodge rods,it was fast untill the rod bolts broke.We were not turning a lot of rpm's. I thought it was one of the fasted cars on the track.


xx RACER 96
Member
posted August 23, 2004 05:19 PM
I ran the numders on decktop dyno and would not need to turn more than 6500 rpm.

Thanks for the feed back,
mike


amonett3rdgen
Member
posted August 23, 2004 06:51 PM
i'm running that and it pull's like a mule the higher the rpms go


m33mcg
Member
posted August 23, 2004 07:59 PM
Is your crank a stock 327 forge crank?
what size rods 6.0? How are the crank spacer holding up or are you doing something else for the journals?
Thanks, Mike


outlawstock17
Member
posted August 23, 2004 09:30 PM
a 2 bbl. carburetor is going to choke it.


Sick&Twisted
Member
posted August 25, 2004 09:07 AM
ill tell you what ive done in the past and you can go from there. i built one and it was one of the fastest winding engines on the face of the earth. the trick is in the longer rods and the heads, git a 6.0 to 6.3 rod and a good flowing head and hold on to your rear end and that motor will take you for a ride.

hotrod

jay116
Member
posted August 25, 2004 04:49 PM
Doesnt that combo require the longer rods or the piston wont come up far enough to make any compression?

------------------
Jason Boivin
http://www.rcracing-team.com


JohnG
Member
posted August 25, 2004 07:17 PM
Theres two ways to do it. one way is to use pistons for a 6 inch rod 377 with a 6.125 rod. The other way is to use keith black pistons, number KB225.
http://kb-silvolite.com/performance.php?action=details&P_id=66

Nick

m33mcg
Member
posted August 26, 2004 04:18 PM
05racer, using that rod would the cid be greater than 360cid?


ss#2
Member
posted August 26, 2004 04:43 PM
rod length has nothing to do with CI.
Just bore and stroke matter.
But like I was asking if you don't use a longer rod or a piston with a different pin height the motor wont run cuz it wont make any compression. My friend wanted to make a 311 but he didnt have 6.25 rods so the piston wouldnt come up far enough to make compression.

------------------
Jason Boivin
http://www.rcracing-team.com


51racing
Member
posted August 27, 2004 08:27 AM
Think its a 348. I know a driver that runs one and turns 7800-8000 weekly. Awesome power.


iowatoolman
Member
posted August 28, 2004 12:24 AM
if you read any nascar tech articles that is almost the engine combo they run except they use a 3.31" stroke
i have heard that you have to use 6.25" rods i checked into building one
decided to build a 327 instead (less money) and spank the guys running bigger motors and to really get at them i painted it PINK
i have no cid rules so i am running against guys that are running 406's 383's


iowatoolman
Member
posted August 28, 2004 12:33 AM
quote:
Originally posted by Wildside17:
Think its a 348. I know a driver that runs one and turns 7800-8000 weekly. Awesome power.

it comes out to be a 352 if you have any questions use the cid tool in the toolbox

drive hard or drive home


Wildside17
Member
posted August 28, 2004 01:27 AM
Sorry, I was thinking standard bore.


iowatoolman
Member
posted August 28, 2004 03:20 AM
hey no problem sometimes we all make mistakes we are only human

drive hard or drive home

and anybody else know where the right turn is????????????????????????
(it is a figure 8 thing)


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