Car Craft
Click here to find out more!

72 402 Chevy BB

  
Car Craft
1 |  2 |  Next   | Last 
Item Posts    Sort Order

72 402 Chevy BB

 
rickpilgrim rickpilgrim
New User | Posts: 6 | Joined: 10/08
Posted: 04/12/10
07:18 PM

Was at the boneyard and spotted this in the motor shed and for 1 bill put that 402 in the back of my truck. She needs a complete rebuild, and is a 2 bolt oval port motor. I was thinking of putting it in an Izuzu NPR 1 ton dump truck I have, use a TH400 trans and build a low buck 'lil dumper for the landscape co i own.
Now the Isuzu has 215/80/16 tires and 4.30 gears so rpm will be above 2500 alot of the time and fuel economy is not an issue for the limited use vehicle.
As long as I have to bore and re-machine everything anyway does anyone have any cam,intake,carb, or durability or any suggestions for this?  

redneckjoe69 redneckjoe69
Enthusiast | Posts: 388 | Joined: 04/10
Posted: 04/13/10
07:07 AM

put some pics up when you get done. sounds like a cool build. Smile  

55Guy 55Guy
Enthusiast | Posts: 444 | Joined: 08/07
Posted: 04/14/10
06:58 AM

You want a good RV type cam that will let the engine build a lot of low end torque for moving that dumper. But, the oval port heads will still flow well enough for good torque into the 4000 RPM range.

I'd suggest calling Comp Cams, get a cam recommendation, then base the intake/carb selection off the cam.  

rickpilgrim rickpilgrim
New User | Posts: 6 | Joined: 10/08
Posted: 04/14/10
09:52 PM

On my last tow vehicle build, my machinest and I had such a headache with CC he quit selling them and won't install another one. My 3rd 6.5TD in the 93 K3500 ex cab 4x4 died and I decided to do a Caddy for it. Put together a 509 with better rods, better oiling system, pocket ported and port matched heads, Edelbrock 800EPS and performer intake, 4" mandral bent single exhaust with CC 260 cam. On first fire up I thought "full race" cam as no idle below 2200 and ran real choppy up to the 5500 redline. Went through everything else and finally after many calls to CC with no result that cam was sent to another cam maker who said it had "runout" on the base circle causing the lifters to pump up. CC would do nothing about it, telling my machinest "improper break in caused it" I can't tell you how mad he was, after all, he builds 10-12 motors a week for a sports car club and has been in it for 37 years. We put in a lunati voodo, 213@.050 and a Holley 650 spreadbore and she idles a bit rough but really hauls a** and is pure fun for a big truck. The before bodywork and still with edelbrock carb pics are on www.webshots.com, user rick pilgrim.
The Isuzu with the deep gears came up to redline real fast with the 4cyl diesel and the 2.55 first gear(automatic)with only 322 ft/lbs, and I have a TH400 with the 2.75/1.57/1.00 gear set from the 82 we re-transmissioned I was going to use. I know how to build power with an Olds 455 or Caddy, but niether of these will take high rpm usage for long, which is why the 402 is going there.I'd like about 400 ft/lbs or so and 350-375 horse or so without high rise intake(cab floor problem)or a low vacumn(HVAC headache). Headers I have(blackjack) and I have a 3" crush bent dual exhaust with H-pipe that will work also. For truck use, compression must stay low(8.5 or so) so that is the main headache. brings up the thought, can a 427/454 cank be put in the 402 and still find pistons?  

gettnlarge01 gettnlarge01
Guru | Posts: 1505 | Joined: 11/09
Posted: 04/15/10
05:23 PM

I have returned cams to Comp several times with no issues but since you have I would use a Lunati Cam with an Edelbrock performer intake and Holley 750 with vacuum secondaries  
luck is when skill and opportunity meet

tuffnuff tuffnuff
Moderator | Posts: 1375 | Joined: 12/09
Posted: 04/15/10
08:52 PM

pilgrim,,,
The 427 crank is 3.75" stroke, the 454 uses a 4" stroke,,, your 402 has a 3.75"
Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

skyeking skyeking
User | Posts: 243 | Joined: 11/09
Posted: 04/16/10
02:11 AM

Laugh  Hi there T/N,
Yes and the sneaky Canucks beat the Yanks
to the punch and created the 402B/block
ahead of schedule with their heavier engine
blocks which they bored out without wall thickness worries.
 To any doubters about this go back many years to HOT ROD MAGS. Cool  Cool
 Think!!! It may be a NEW experience!!  Skyeking,,,,, Smile  
skyeking

idrivejunk idrivejunk
Guru | Posts: 1041 | Joined: 12/09
Posted: 04/16/10
06:13 AM

I had a 72 SS with the 402. I think it would do great in a dump truck.  
idrivejunk

skyeking skyeking
User | Posts: 243 | Joined: 11/09
Posted: 04/16/10
05:08 PM

Hi Junkman,
 Which end of the truck were you thinking of??
 As I said before Chevrolet make the BEST small
 blocks and Dodge Make the toughest Big Blocks..
 NO..I am not a descendant of Benidict Arnold..
  Get well soon....Skyeking.....  
skyeking

gettnlarge01 gettnlarge01
Guru | Posts: 1505 | Joined: 11/09
Posted: 04/16/10
07:30 PM

LOL  
luck is when skill and opportunity meet

idrivejunk idrivejunk
Guru | Posts: 1041 | Joined: 12/09
Posted: 04/16/10
08:39 PM

Hi Skyeking!

Alas, freedom of speech rears it ugly noggin. Just sayin - heck I think Chevy used those in dump trucks, too. They are about the lowest on the rat totem pole, however.  
idrivejunk

NaughtyDodge04 NaughtyDodge04
New User | Posts: 28 | Joined: 03/08
Posted: 04/16/10
10:51 PM

Put the crank from the 402 in any 454 block and have yourself a ball with a 427cid engine. more cubes= bigger torque no?  

tuffnuff tuffnuff
Moderator | Posts: 1375 | Joined: 12/09
Posted: 04/17/10
08:54 AM

+2
That makes a wicked combo, especially a +.030 = 433 cu. in. with Revs to spare
Wink  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

rickpilgrim rickpilgrim
New User | Posts: 6 | Joined: 10/08
Posted: 04/17/10
08:56 PM

I can only wish I had a 454 block to start with. Yes they had a 454 at the boneyard but it was a 98 TBI truck motor with 76K mi and ran excellent but they wanted $1200 for it, and I'm not willing to spend that for a core engine that will have many changes just to adapt to the Isuzu NPR. The 402 was just about free(for a BB chevy) and can take the mid and upper mid rpm with ease. What I don't know is can I build enough power with 8.5 compression to make it have power and act like my other 100 cid larger engines in our other trucks. I thought about a mini blower but the yardstick says no. What cams have you BB Chevy guys run that pull hard from 2200-6000 rpm? As intakes go, who's non air gap intake works best?  

rickpilgrim rickpilgrim
New User | Posts: 6 | Joined: 10/08
Posted: 04/17/10
09:27 PM

Skyeking- our mopar trucks over the yrs have been like tractors, tough'n durable, get the job done, steady and have ho hum speed. The 440 doesn't like heavy loads, the V10 had good low rpm but weak on the hwy and the new Hemi is a joke and you can't even get one in a dually truck. In truck land, The BB chevy rules- there is no substitute.  

1 |  2 |  Next   | Last