350 > 454 swap, RE: Frame mounts? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1BadSS · 04-30-2008, 03:28 AM

I know I had to have a set of bbc mounts in my 69 when I swapped it to a bbc. But now i'm messing with the 73-87's and i'm unsure if i need the frame mounts. I took them out of the parts truck along with all of the other parts I thought I needed. So it boils down to this.... Do I need to use them in a truck thats formerly an sbc truck?

CrashOverKill · 04-30-2008, 03:39 AM

Yeaper. If memory serves me you sure do. Honestly I think there is a seperate set of holes you mounts bolt into even.

**Captkaos** · 04-30-2008, 05:29 AM

SBC = BBC, the mounts are the same...

TLoz · 04-30-2008, 02:58 PM

Hi,
Here's what I've found out so far: On a 1978 K20 orginal SB suburban the rubber/metal inserts for the BB will not fit on the frame mounted towers. I've tried ones from NAPA and O'Riley. I'm going back to NAPA with the tower to find out if a SB mount still fits the tower and determine if there is a difference between the fit/location of the actual motor mount bolt. I'll let you know what I find out. Tom

454HO · 04-30-2008, 03:20 PM

I ran into some issues with mounts. See this thread

http://67-72chevytrucks.com/vboard/s...ighlight=mount

bigblock73 · 04-30-2008, 03:34 PM

Are the frame towers on a 1/2 ton truck...or 3/4 ton truck? I believe the towers are different between 1/2 and 3/4 tons. I have a set of "BB" frame towers, they were different that the stock ones in my 1/2 ton...I am assuming they came from a heavier truck.

bigblock73 · 04-30-2008, 03:35 PM

FWIW, I went from 350 to 454 on my 73...everything bolted up perfectly using the stock parts on my 73.

**Captkaos** · 04-30-2008, 06:51 PM

3/4T up have different height frames than 1/2T. Burbs have this frame difference from what I have seen.

73-79 (80) SBC and BBC clamshells are identical from my experience. 81-86 there was ONLY 305 clamshells (outside of California), they aren't the same as the previous models and a 454 was never offered. I have put 454's in place of 305's though in 81-87's. The frame stands on 73-87's are the same.

1BadSS · 04-30-2008, 07:11 PM

Quote:

Originally Posted by Captkaos

3/4T up have different height frames than 1/2T. Burbs have this frame difference from what I have seen.

73-79 (80) SBC and BBC clamshells are identical from my experience. 81-86 there was ONLY 305 clamshells (outside of California), they aren't the same as the previous models and a 454 was never offered. I have put 454's in place of 305's though in 81-87's. The frame stands on 73-87's are the same.

Oh great, So I spent an hour wrestling both of the frame mounts off of the frame and didn't need them.

**Captkaos** · 04-30-2008, 07:24 PM

If you are talking about frame stands for 1/2T to 1/2T, unfortunately yes...

04-30-2008, 03:28 AM	#1
1BadSS NOT REALLY BANNED! Join Date: Jul 2004 Location: Shawnee, KS Posts: 1,072	350 > 454 swap, RE: Frame mounts? I know I had to have a set of bbc mounts in my 69 when I swapped it to a bbc. But now i'm messing with the 73-87's and i'm unsure if i need the frame mounts. I took them out of the parts truck along with all of the other parts I thought I needed. So it boils down to this.... Do I need to use them in a truck thats formerly an sbc truck? __________________ 1987 Mustang Coupe - 2.7 Stroker, 78mm turbo, Stainless header, 3" Exh, FMIC, 160lb/hr Injectors, MS3, twin walbro 255's, 34psi. Eating V8's daily. 04 Pontiac GTO 04 Ford Mustang GT 68 C20 LWB stripper truck 73 K5 Cheyenne 76 C20 Sierra Crew SRW 88 K20 Suburban I'm not hammering on metal just to hammer, i'm creating a piece of art.

04-30-2008, 03:39 AM	#2
CrashOverKill Registered User Join Date: Apr 2008 Location: Sparta Michigan Posts: 18	Re: 350 > 454 swap, RE: Frame mounts? Yeaper. If memory serves me you sure do. Honestly I think there is a seperate set of holes you mounts bolt into even.

04-30-2008, 05:29 AM	#3
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: 350 > 454 swap, RE: Frame mounts? SBC = BBC, the mounts are the same... __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

04-30-2008, 02:58 PM	#4
TLoz Registered User Join Date: Dec 2003 Location: Indy Posts: 326	Re: 350 > 454 swap, RE: Frame mounts? Hi, Here's what I've found out so far: On a 1978 K20 orginal SB suburban the rubber/metal inserts for the BB will not fit on the frame mounted towers. I've tried ones from NAPA and O'Riley. I'm going back to NAPA with the tower to find out if a SB mount still fits the tower and determine if there is a difference between the fit/location of the actual motor mount bolt. I'll let you know what I find out. Tom

04-30-2008, 03:20 PM	#5
454HO Registered User Join Date: Apr 2005 Location: Austin, TX Posts: 1,223	Re: 350 > 454 swap, RE: Frame mounts? I ran into some issues with mounts. See this thread http://67-72chevytrucks.com/vboard/s...ighlight=mount __________________ - Greg

04-30-2008, 03:34 PM	#6
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,824	Re: 350 > 454 swap, RE: Frame mounts? Are the frame towers on a 1/2 ton truck...or 3/4 ton truck? I believe the towers are different between 1/2 and 3/4 tons. I have a set of "BB" frame towers, they were different that the stock ones in my 1/2 ton...I am assuming they came from a heavier truck. __________________ Jeff 73-87.com 73-87.com Facebook page 73-87 cab corner 6x9 speaker brackets for sale 67-72 cab corner speaker brackets for sale 47-54 cab corner speaker brackets for sale

04-30-2008, 03:35 PM	#7
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,824	Re: 350 > 454 swap, RE: Frame mounts? FWIW, I went from 350 to 454 on my 73...everything bolted up perfectly using the stock parts on my 73. __________________ Jeff 73-87.com 73-87.com Facebook page 73-87 cab corner 6x9 speaker brackets for sale 67-72 cab corner speaker brackets for sale 47-54 cab corner speaker brackets for sale

04-30-2008, 06:51 PM	#8
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: 350 > 454 swap, RE: Frame mounts? 3/4T up have different height frames than 1/2T. Burbs have this frame difference from what I have seen. 73-79 (80) SBC and BBC clamshells are identical from my experience. 81-86 there was ONLY 305 clamshells (outside of California), they aren't the same as the previous models and a 454 was never offered. I have put 454's in place of 305's though in 81-87's. The frame stands on 73-87's are the same. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

04-30-2008, 07:24 PM	#10
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: 350 > 454 swap, RE: Frame mounts? If you are talking about frame stands for 1/2T to 1/2T, unfortunately yes... __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com



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