BB swap into blazer crossmember question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Radiatta_71 · 04-12-2006, 10:42 PM

I have started the BB swap in my blazer.

before i get to far I am seriously considering moving the engine forward 2" or so to gain more clearance at the firewall.

I also would like to be able to remove the oil pan so I am looking at using a '73 and newer crossmember. Has anyone done this?

How much modification is involved?

Anyone have a spare crossmember layout around? (In the Portland area)

any other issues with the swap would be appreciated.

Cheers.

vtblazer · 04-13-2006, 06:04 AM

It's been discussed both in the blazer section and the truck section's a fair amount over the last year.

2wd or 4x4?
Try going through the search function and I'd bet you'll find some great info on it.

Cool mod, good luck with it.

**Yukon Jack** · 04-13-2006, 09:27 AM

Here are two links for the article on using the later crossmember.

link 1

link 2

Burt4x4 used this type crossmember when he put in his 454 and had to do very minor firewall mods. He does have a 3" body lift I believe.

I stock with the stock crossmember on my 69 K20 and had to make major mods. You can see info on my swap on my website listed in my sig.

qksilver · 04-13-2006, 11:01 PM

I have all the pieces off a 86 burb and a 72 burb. I haven't actually done it yet but between the eye ball and tape measure it looks Like it will work well, maybe a slight dimple on my firewall. I have seen enough differences in firewalls between my other trucks and other peoples, so it may not be true in all cases.
I like the newer crossmember because of clearance, cheaper mounts and can get the oild pan off if needed.
Good luck

70rs/ss · 04-14-2006, 12:16 PM

My 72 has a BBC sitting on and in the SBC mounts/position. Everything fits/works. The BBC is stock w/manifolds so no headers, but thats the way I like it, and the HEI is right there on the firewall, but no biggy. I can try some picts, but I know there is a post of mine back when I got the Blazer, so search for a post from me and you'll see the BBC sitting pretty without any mods at all. Use the SBC motor mount to mount the BBC to the SBC frame mount and everything will line up.

Here's the link to picts, I know you can't see it well, but I assure you it is inthere with clearance on the SBC mounts.

http://67-72chevytrucks.com/vboard/s...d.php?t=187042

classicchev · 04-14-2006, 12:41 PM

Im doing the same thing , be careful not to get too much weight forward, or you will have major traction issues.

04-12-2006, 10:42 PM	#1
Radiatta_71 Registered User Join Date: Jul 2002 Location: Vancouver, WA Posts: 117	BB swap into blazer crossmember question I have started the BB swap in my blazer. before i get to far I am seriously considering moving the engine forward 2" or so to gain more clearance at the firewall. I also would like to be able to remove the oil pan so I am looking at using a '73 and newer crossmember. Has anyone done this? How much modification is involved? Anyone have a spare crossmember layout around? (In the Portland area) any other issues with the swap would be appreciated. Cheers.

04-13-2006, 06:04 AM	#2
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,538	Re: BB swap into blazer crossmember question It's been discussed both in the blazer section and the truck section's a fair amount over the last year. 2wd or 4x4? Try going through the search function and I'd bet you'll find some great info on it. Cool mod, good luck with it. Last edited by vtblazer; 04-13-2006 at 06:04 AM.

04-13-2006, 09:27 AM	#3
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,683	Re: BB swap into blazer crossmember question Here are two links for the article on using the later crossmember. link 1 link 2 Burt4x4 used this type crossmember when he put in his 454 and had to do very minor firewall mods. He does have a 3" body lift I believe. I stock with the stock crossmember on my 69 K20 and had to make major mods. You can see info on my swap on my website listed in my sig. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

04-13-2006, 11:01 PM	#4
qksilver Senior Member Join Date: Dec 2004 Location: Southern Pines NC Posts: 3,853	Re: BB swap into blazer crossmember question I have all the pieces off a 86 burb and a 72 burb. I haven't actually done it yet but between the eye ball and tape measure it looks Like it will work well, maybe a slight dimple on my firewall. I have seen enough differences in firewalls between my other trucks and other peoples, so it may not be true in all cases. I like the newer crossmember because of clearance, cheaper mounts and can get the oild pan off if needed. Good luck

04-14-2006, 12:16 PM	#5
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: BB swap into blazer crossmember question My 72 has a BBC sitting on and in the SBC mounts/position. Everything fits/works. The BBC is stock w/manifolds so no headers, but thats the way I like it, and the HEI is right there on the firewall, but no biggy. I can try some picts, but I know there is a post of mine back when I got the Blazer, so search for a post from me and you'll see the BBC sitting pretty without any mods at all. Use the SBC motor mount to mount the BBC to the SBC frame mount and everything will line up. Here's the link to picts, I know you can't see it well, but I assure you it is inthere with clearance on the SBC mounts. http://67-72chevytrucks.com/vboard/s...d.php?t=187042 Last edited by 70rs/ss; 04-14-2006 at 12:25 PM.

04-14-2006, 12:41 PM	#6
classicchev Senior Member Join Date: Nov 2003 Location: Calgary Alberta Posts: 1,936	Re: BB swap into blazer crossmember question Im doing the same thing , be careful not to get too much weight forward, or you will have major traction issues. __________________ 67- 72 Parts collecter



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