350 frame motor mounts SB VS BB - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**aotte1** · 03-22-2014, 05:27 PM

1986, C10 with 350 engine and LY6 transmission. Any issues caused by using big block frame mounts? Reason is to raise headers away from ground other then raising the CG of the truck.
Thanks,
Les

**kwmech** · 03-22-2014, 06:12 PM

The frame mounts are the same in sb or bb. You may be thinking of the shell that bolts to the block, some of those were a different height. You could also put a factory (found in the wrecking yards) 1/4'' thick shim between the cup and the block

**aotte1** · 03-22-2014, 10:04 PM

KW,

I am not very knowledgeable about these trucks, but thought the engine support that goes between the frame and the bolt-in front cross member were different from SB to BB. I think I have two different types of these. The SB ones have a bigger drop, then the ones I think are for BB. Will post pictures of them.

The shim you are referring to, is it similar to the ones used on the 292 straight six on mid 60s trucks? They are cylinders with very thick walls, about 1/2 inch shim.
Thanks,
Les

**Captainfab** · 03-23-2014, 12:06 AM

The only difference in the frame brackets for the '73+ trucks that I am aware of is the difference between the C10 brackets and the C20/30 brackets. The C10 frames are taller, so those brackets are taller .

**aotte1** · 03-24-2014, 02:31 PM

Captain fab,
Parts books confirms your knowledge for brackets (group 0.029)( this is the bracket that goes from the frame to crossmember), it also shows the next part the "clamshell" to be different for SB and BB (group 0.927) 5.7 is 459021 and 454 is 35717. The next bracket that connects to the engine is different too ( group 0.029) 5.7 is 334601 and 454 is 14067103.

Question if I want to raise engine up in frame ( raise header further from ground) can I use different parts mentioned above. For example the 3/4, 1 ton frame crossmember bracket along with the 454 clamshell and engine bracket?

Thanks for your help,
Les

**aotte1** · 03-24-2014, 02:49 PM

Follow-up, continuation of above post, went and looked at my three sets of frame to crossmember brackets and they are all the 361/362 brackets. Two sets were purchased as BB brackets. Picture of bracket purchased as BB below. Then only clam shell is different or they are not BB ???

03-22-2014, 05:27 PM	#1
aotte1 Registered User Join Date: Oct 2013 Location: lousiville Ky Posts: 2,645	350 frame motor mounts SB VS BB 1986, C10 with 350 engine and LY6 transmission. Any issues caused by using big block frame mounts? Reason is to raise headers away from ground other then raising the CG of the truck. Thanks, Les

03-22-2014, 06:12 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,689	Re: 350 frame motor mounts SB VS BB The frame mounts are the same in sb or bb. You may be thinking of the shell that bolts to the block, some of those were a different height. You could also put a factory (found in the wrecking yards) 1/4'' thick shim between the cup and the block

03-22-2014, 10:04 PM	#3
aotte1 Registered User Join Date: Oct 2013 Location: lousiville Ky Posts: 2,645	Re: 350 frame motor mounts SB VS BB KW, I am not very knowledgeable about these trucks, but thought the engine support that goes between the frame and the bolt-in front cross member were different from SB to BB. I think I have two different types of these. The SB ones have a bigger drop, then the ones I think are for BB. Will post pictures of them. The shim you are referring to, is it similar to the ones used on the 292 straight six on mid 60s trucks? They are cylinders with very thick walls, about 1/2 inch shim. Thanks, Les

03-23-2014, 12:06 AM	#4
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: 350 frame motor mounts SB VS BB The only difference in the frame brackets for the '73+ trucks that I am aware of is the difference between the C10 brackets and the C20/30 brackets. The C10 frames are taller, so those brackets are taller . __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

03-24-2014, 02:31 PM	#5
aotte1 Registered User Join Date: Oct 2013 Location: lousiville Ky Posts: 2,645	Re: 350 frame motor mounts SB VS BB Captain fab, Parts books confirms your knowledge for brackets (group 0.029)( this is the bracket that goes from the frame to crossmember), it also shows the next part the "clamshell" to be different for SB and BB (group 0.927) 5.7 is 459021 and 454 is 35717. The next bracket that connects to the engine is different too ( group 0.029) 5.7 is 334601 and 454 is 14067103. Question if I want to raise engine up in frame ( raise header further from ground) can I use different parts mentioned above. For example the 3/4, 1 ton frame crossmember bracket along with the 454 clamshell and engine bracket? Thanks for your help, Les

03-24-2014, 02:49 PM	#6
aotte1 Registered User Join Date: Oct 2013 Location: lousiville Ky Posts: 2,645	Re: 350 frame motor mounts SB VS BB Follow-up, continuation of above post, went and looked at my three sets of frame to crossmember brackets and they are all the 361/362 brackets. Two sets were purchased as BB brackets. Picture of bracket purchased as BB below. Then only clam shell is different or they are not BB ???



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