250 6 cylinder to 5.3 swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jrb56 · 03-12-2016, 10:30 AM

Guess the title states it, about to swap a 80 step side.

I have successfully swaped a 6.0 into my 56 bel air, but I have a couple of questions on the truck.

Would it be easier to swap the 6 cylinder frame mounts for SBC?

Has anyone used the 6 cylinder frame mounts successfully with a ls engine?

This is for my 14 year old son... So I have some time.

Thanks!!

chrismoore701 · 03-12-2016, 11:34 AM

My truck had a 6 when I got it. But it was a factory 8. I was able to use the same frame mounts. Just needed new motor mounts. Which at the time were impossible to find. Had to go to junk yard. Not sure about now

**MikeB** · 03-13-2016, 03:04 PM

My notes say the 79-84 C10 engine mount frame brackets are the same for 250 six and small block V-8.

They are:
464710, bracket, engine mt frame, RH
6271361, bracket, engine mt frame, LH

However, I can't say which brackets an LS conversion requires. That's a function of the aftermarket brackets that bolt to the engine.

LeesTruk · 03-14-2016, 05:50 AM

I swapped a 5.3L into my '80 Fleetside that had the 250 6cyl. I used the stock frame mounts but moved them to the lower V8 position on the frame. I was then able to use the V8 clamshells to bolt the new engine in place

aggie91 · 03-14-2016, 05:00 PM

check out the mount adapter plates that Tejas Steelworks has they move the engine up and forward a bit and use the stock frame mounts and the stock V8 clam shells.
They have a facebook page that is helpful.

https://www.facebook.com/TejasSteelWorks

03-12-2016, 10:30 AM	#1
jrb56 Registered User Join Date: Nov 2003 Location: Buda TX Posts: 9	250 6 cylinder to 5.3 swap Guess the title states it, about to swap a 80 step side. I have successfully swaped a 6.0 into my 56 bel air, but I have a couple of questions on the truck. Would it be easier to swap the 6 cylinder frame mounts for SBC? Has anyone used the 6 cylinder frame mounts successfully with a ls engine? This is for my 14 year old son... So I have some time. Thanks!! __________________ Joe 62 Stepside swb 468 bbc Muncie M-20 Cicken poop

03-12-2016, 11:34 AM	#2
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,326	Re: 250 6 cylinder to 5.3 swap My truck had a 6 when I got it. But it was a factory 8. I was able to use the same frame mounts. Just needed new motor mounts. Which at the time were impossible to find. Had to go to junk yard. Not sure about now __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

03-13-2016, 03:04 PM	#3
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,597	Re: 250 6 cylinder to 5.3 swap My notes say the 79-84 C10 engine mount frame brackets are the same for 250 six and small block V-8. They are: 464710, bracket, engine mt frame, RH 6271361, bracket, engine mt frame, LH However, I can't say which brackets an LS conversion requires. That's a function of the aftermarket brackets that bolt to the engine. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

03-14-2016, 05:50 AM	#4
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 433	Re: 250 6 cylinder to 5.3 swap I swapped a 5.3L into my '80 Fleetside that had the 250 6cyl. I used the stock frame mounts but moved them to the lower V8 position on the frame. I was then able to use the V8 clamshells to bolt the new engine in place

03-14-2016, 05:00 PM	#5
aggie91 I'm just glad to be here! Join Date: Jan 2008 Location: Longview, TX Posts: 4,788	Re: 250 6 cylinder to 5.3 swap check out the mount adapter plates that Tejas Steelworks has they move the engine up and forward a bit and use the stock frame mounts and the stock V8 clam shells. They have a facebook page that is helpful. https://www.facebook.com/TejasSteelWorks __________________ Karl 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square



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