Factory 396 1970 Blazer???

[PGG]

This is a nice slick K5 but did they ever put a factory 396 in them?

http://www.ebay.com/itm/Chevrolet-B...1058b6e6:g:QH8AAOSwpIdW8Ap5&item=111943399142

 

[skunked]

there was another thread about this a month or two ago. Consensus was, no it was not an option. OP claiming he had one went MIA.

thread https://ck5.com/forums/threads/73-k5-454-big-block.324723/

 

[6872xtc]

And that thread is about a '73 which had the firewall clearance to do it.
The '70 doesn't, I know from experience and lots of looking around at other trucks and information.
I've seen some pretty butchered firewalls to make one fit, too. Sledgehammers do some work!

 

[ktmoutfront]

Of course it is a factory 396. Some factory somewhere made it.

 

[Phil513]

Of course it is a factory 396. Some factory somewhere made it.

made me LOL.

 

[diesel4me]

I've seen more than one first gen K5 with a big block in it--NOT factory installed however..they will fit in the engine bay fine without beating the firewall in--IF you use a points distributor...pickups of that era had a big block option and the engine bay is the same on a K5..

I did massage the firewall on my '72 K5 to get an HEI distributor in it,and it had a stock 350...it did fit without massaging,but was too close to use that "ring" that the plug wires snap onto on top of the cap,and it was a real pain getting the cap on and off...until I made more room..

And after I did,my radio went tits up ,I guess it didn't like a sledge hammer pounding inches away from it....

 

[6872xtc]

Yes the engine bay is the same, but not the engine position in all 4x4 applications, compared to the 2wd. I had no problems with the HEI, but the heads ran into the firewall. Same thing on a lot of others.
I have seen some use a body lift to make it clear the heads, but other than that, you would have to move the engine forward. And that gets complicated too.

 

[Greg72]

I've seen more than one first gen K5 with a big block in it--NOT factory installed however..they will fit in the engine bay fine without beating the firewall in--IF you use a points distributor...pickups of that era had a big block option and the engine bay is the same on a K5..

I did massage the firewall on my '72 K5 to get an HEI distributor in it,and it had a stock 350...it did fit without massaging,but was too close to use that "ring" that the plug wires snap onto on top of the cap,and it was a real pain getting the cap on and off...until I made more room..

And after I did,my radio went tits up ,I guess it didn't like a sledge hammer pounding inches away from it....

You can't fit a BBC into a 1st Gen Blazer without firewall mods..... unless you plan to run it without any valvecovers!!!


-G

 

[diesel4me]

Even if you used these off a 454 Corvette ?...

 

[Greg72]

Even if you used these off a 454 Corvette ?...
View attachment 201252

If you could find a set with that notched area on BOTH sides.... The interferences are on both sides of the firewall

-G

 

[not4show]

GM didn't put a big block in the 4x4s until the late 70s.