Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

I put a 454 in my '72 Jimmy and had to do some work to the firewall on the drivers side for valve cover clearance. I cut out some of the firewall moved it towards the drivers side and rewelded it.

I also moved the engine, tranny/transfer case forward 1" for HEI clearance, didn't really have to move the engine, but the HEI was to close for my preference.

Also had to trim the frame rails for header clearance.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Awesome thread!



As soon as I put the Ram Jet 502 in my '72 Blazer, I'll post pics.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Here is my swap.
427 bored .30 to 431 ci
Thorley = 304-Y
Moved drivetrain 7/8" forward for clearance.
Running what I believe is a oil pan out of a passanger car with stock crossmember. Som slight modifications to the firewall.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

I'm confused about whats different between a 2WD and 4 WD when it comes to engine placement. There were BB's put in 2WD trucks.
Does the engine sit further back or higher in the engine bay in a 4WD then a 2WD?

Why the need to cut the firewall on a 4WD?

Gary

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Yes, the motor in a 4wd is set further back. Probably partly for better weight transfer and partly to give a slightly longer front driveshaft to reduce it's angle.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Thanks Yukon. I was always puzzled why the modifications were necessary.

Gary

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Bigger block (Cadillac!) in my former C now K40:


I used the DIY4X engine crossmember and made the engine saddles.

Squeezes in there:


Should be fun with the dual turbos...

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

'71 Blazer w/ 3" body lift and a 396 ('69 Chevelle). It has plenty of room, and I even put in a huge Mallory HEI with no clearance issues. The hood's straight now, by the way.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Can you shoot a couple pics of your firewall in the valve cover area?

What engine crossmember are you using and how is your oil pan clearance?

Good looking K5 btw.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Here's a sneak-peek at mine and the rig the motor is going into:

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

I dig the Michelin XML's. I've been looking for a set.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Tasty looking motor!!!

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Hell Ya CDA that will be fun to drive!:metal::metal:

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Thanks!


I also have a set of Michelin XML 325/85R16's (39X13) as well.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Thanks guys!


Basically the only thing left to get is a fuel tank and fuel system.

I'm thinking a late model Blazer tank and a 8.1 Vortec fuel system set up.

I need baffles in the tank and a high pressure pump (40-70 PSI).

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Where are you getting them? I want a set for my tow rig.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

I bought them off of eBay the last couple of years.

From a place at the International Border down in San Diego.


The skinny set I bought two years ago and the wider set I bought last year.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

When I order my T-case I'll use my TH350/NP205 in the mean time.


I'm looking at the Atlas 4SP or the StaK 5.44.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

When you go Stak, you never go back.

Let me know if you can find more of the wider XML.s

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Which StaK T-case is that?

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

4 speed. It's in my Jeep.

http://www.pirate4x4.com/forum/showthread.php?t=489888

It's on topic, too... it's a BBC in a 4x4 :p

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

You mean 3 speed ;) ?!



Why'd you pick StaK over Atlas?

The only reason I'm thinking of getting a Stak is because Atlas is going through major changes in their gear-cutting. They're bringing it in-house and I'm concerned about QA since they're starting from scratch.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

The Atlas isn't rated for our trucks. Talk to Vic. I have too much HP and too heavy a rig. Atlas = Dana 300 based t-case. Stak all new engineering.

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Really :eek: :eek: ?!!

On their website they claim they can handle tons of torque. My rig will weigh approx. 5500LBS to 6000LBS easily (Fully loaded for a trail-run). And the Ram Jet will be doing 565FT/LBS of torque (At the crank)!


This is a first for me: Atlas = Dana 300 based t-case.


And StaK is all new engineering from the ground up?

I'm eye-balling the StaK 5.44/3.05:1 model.



BTW; Who's Vic ;) ?!

Re: 67-72 BigBlock 4x4s! Pos pics info here.
 

Vic is one of the original owners of Atlas

When they released the Atlas, it was SWB only (Jeep, Bronco, Land Cruiser, etc). You can find pictures all over the place. It's one of the original marketing points for the NP205 derived Lomax by Novak.

Stak is it's own design, not based off a production t-case. They were also first to market with a tough 3 speed t-case, they also have proto-type four speeds out... same case.