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To all you First Genners(67-72 P/U) with Big Blocks

Burt4x4

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Did you keep the original engine mount crossmember?
Did you swap it out for a 73up style?
Did you custom make your own?
 

RingMaster4x4

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When I had mine on the factory frame I used the factory small block crossmember with no problems. /forums/images/graemlins/thumb.gif
 

D.W. jr

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I used the factory small block crossmember and smallblock mounts. everything lined up great, I had to dimple the firewall a tiny bit for the valve covers to clear though. Dennis. engine is a 427 tall deck truck motor
 

Burt4x4

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Thanks for the replys fellas. I am trying to adapt a 73 up crossmember. I'm starting to wonder if the benifits of doing this are worth it?
Here is a pic, kinda dark....
frame5.jpg

This pic has the frame engine mount plates, they are just siting there cuz I need to spread open the C channel frame to get them inside then bolted.
frame2.jpg

With the forward mounted member the oil pan will remove easyly.

Can you guys drop the oil pan with the stock member there? /forums/images/graemlins/ears.gif

I know my with my 350 I could not remove the pan with out lifting the engine. I hated that!
Thanks
Burt
 

Burt4x4

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Thanks Bro /forums/images/graemlins/thumb.gif I figured if the 350 pan would not come out then surly a BBC pan would not.
 

Yukon Jack

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My pan definitely wouldn't come out with the crossmember in place. Just for comparision, here's my stock crossmember shortly before I put in the 454. I hope your situation works out, the article made it sound like an easy bolt in, guess not.

28stockenginetowerP1090006.jpg
 

Burt4x4

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Ya YJ that is the same one I removed, I still have it just incase.
That artical says that two of the orginal holes line up to find out were the x-member goes. My first attempt and installing it...well I belive I used the wrong two holes so now I'm back to square one /forums/images/graemlins/whistling.gif
I'm thinking of trying to call that "Paul's RV" that is listed in the artical to ask if he can varify wich two holes, but I think I may have found them already /forums/images/graemlins/thumb.gif.
 

R72K5

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have to keep in mind that these trucks were designed without big block option until 73, so you are doing a custom conversion by installing a BBC engine into a 4x4, and also technically 2wd before 68
 

stretch67

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hey burt i did the swap you are talking about. i had a 1971 frame with smallblock crossmember but didn't want to use the old style mounts and had a 74 donor truck (small block mounts i think!) i used the engine crossmember with offroad design mounts. i also used the front xmember for the swaybar with ofd quick disconnects i had to mock up and drill new mounting holes but i was able to move engine forward to help firewall clearance also it is worth the swap /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
 

Burt4x4

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Cool! I was begining to think I was the only one on this planet that was doing this, well besides the article I read on it /forums/images/graemlins/waytogo.gif
Do you hapen to have any build up pics?
When you say you moved it forward I assume you moved your whole drivetrain? Tranny and all? I don't want to do that way to much work. I have a 3"body lift so I got the clearance already /forums/images/graemlins/waytogo.gif.
Do you recall using any of the original crossmember holes?
Acording to that artical....I'll go find it...
here it is...the guy says two of the orginal holes..wel I found two holes but I didn't read slower..two of the original crossmember holes are used...hahahah so I have to move it back about 1" due to my lack of reading skills /forums/images/graemlins/whistling.gif
39bbswapsml.jpg

anyway I hope to get it in the right spot this weekend...any info you can share would be great /forums/images/graemlins/waytogo.gif /forums/images/graemlins/peace.gif
 

stretch67

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burt i was converting from a 4-speed to an auto so i had to move the tranny crossmember anyways. i dont have pics with engine out but i could shoot some with it in if you want? with the smallblock i had little firewall-distributor clearance an hei dist was almost touching the firewall. i mounted the radiator then mocked the engine up so i had proper dist to firewall and fan to radiator clearance (the stock 1st 4x4 fan shroud is way to deep i used the 2nd gen with a little teaking it worked) i have read the 1st gen crossmembers cause oilpan clearance problems with the big block but i am not sure? pm me and i can email you some pics i haven't posted pics here before so i am not sure how to do that! /forums/images/graemlins/dunno.gif
 

Burt4x4

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Ya thats cool, I think I got it figured out. I didn't get much done this weekend so no real updates...
Have a great week all.... /forums/images/graemlins/peace.gif /forums/images/graemlins/weld.gif /forums/images/graemlins/grind.gif /forums/images/graemlins/hack.gif /forums/images/graemlins/woot.gif
 

Burt4x4

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I am using a 4core rad. It is the rad they used for our years but just in the BBC trucks....SBCs came with 3row rads. I run a cluch fan with an electric backup or trail fan when the slow get slower and the days get hotter /forums/images/graemlins/peace.gif
 

steve_kibbe

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Thanks burt, will the 2wd 4core fit, I know the k5's didn't come with a bbc option, and how about aluminum, is it worth the differance in cash? One last one for y'all out there, how about any aftermarket engine mounts, like energy suspension, anybody have any luck finding one to fit there beasts?
Thanks Y'all /forums/images/graemlins/k5.gif
 

Burt4x4

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Ya I don't think the rad suport is any different between 2x and 4x. I ordered mine from www.radiators.com. I did look into going aluminum but it would have been $500+. I paid like 180 for the 4core and it works great.
I don't know about the mount question...try a search I think there was a topic on this here somewere...
 

stretch67

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you can also use 2nd gen 4-core. you just have to run heater hose to rad instead of water pump.
 
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