4bt in a 1978 Blazer

[crawlink5]

1978 Chevy Blazer - Bonanza Edition
1986 Cummins 4BT rebuilt

4 wd NV4500 rebuilt from GearTechHD.com
w/hyd clutch
NV to 465 bellhousing with no adapter - machined at GearTechHD.com
11" clutch and pressure plate for BB chevy
Flywheel from Avant Salvage
pilot bearing

np205 rebuilt from GearTechHD.com - twin stick
NP to NV with no adapter - machined at GearTechHD.com

14bff rear 4.56 detroit with disc brakes
d60 front 4.56 open

Hydro boost from 1985 Blazer w/diesel

a 1" inch body lift would be nice but not absolutely necessary. A 5.5" spring lift in front and a 4.5" shackle flip in rear. the lift is necessary due to height of motor. No hood cutting but it is about 1/2" from hood.

26+ mpg highway

 

[sweetk30]

and your point is what?

no pics of links to see it. sounds good with the specs but we want pics.

 

[crawlink5]

Well OK. Better (newer) pics will be coming.

http://coloradok5.com/forums/showthread.php?t=163394

A daylight shot of it here before I lifted it
http://www.chevyblazer.net/chevyblazer/

 

[u2slow]

11" clutch and pressure plate for BB chevy

Why not a 12"? Fits on the same flywheel as the 11". Unless the clutch size is restricted somehow by the engine or starter.

 

[crawlink5]

Why not a 12"? Fits on the same flywheel as the 11". Unless the clutch size is restricted somehow by the engine or starter.

I am pulling it out this coming weekend - so I'll have to remeasure. Maybe it is a 12. But, I didn't know the 12 would fit same as an 11.

 

[diesel4me]

MIGHT fit...

Some of the cast aluminum bellhousings with no inspection cover wont fit over a 12" clutch pressure plate..

Not the end of the world though..an 11" clutch has nearly the same surface area as a 12" does...even a 10-1/2" disc has more area than you think..its lining goes closer to the center than any of the other sizes..

I ran 3 12" clutches in my 72 K5 ,and all 3 of them failed in short order..the 3 finger pressure plates all lost one finger,and they would no longer release!

..I finally got sick of pulling the SM465 and NP205 out ,and used a diaphram style 11" centerforce clutch my friend gave me from his drag car that got totaled after only 4 runs down the 1/4 mile..never gave me a lick of trouble,and my left leg quickly shrank back to its normal size.. --those 3 finger 12" pressure plates sure had a high pedal effort..

 

[u2slow]

If its a truck bellhousing (5.125" index, i.e. for SM465), and a 168-tooth flywheel, either the 11" or 12" can be used.

I've used the 11" on L6's, and 12" on the V8s - all were diaphragm type.

I haven't measured to calculate the actual surface area, but the 12" comes with the larger engines and higher GVWRs.

 

[Brians89K5]

This is exactly what I want to do with my truck when my 350 finally craps out. Although I was thinking of using a newer cummon's from a 1 ton truck. I just gotta figure out how to get CA smog to allow me to do it on my 89. :-(Badass my friend. I am quite jealous!


~Brian

 

[crawlink5]

That is the bellhousing I have. No inspection cover. But IIRC, looking at the pressure olate I don't think it could have gotten any bigger. I never measured it - I just assumed 11"