BBC in 72 4X4 motor mount ?s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GM72K10 · 07-19-2003, 02:48 PM

Ok
To make a long story short, last year I got free, yes free a 72 GMC K2500 4x4 454 auto TH400, 3:73 gears, but MINUS the engine. As if I needed another one but free is real hard to say no at. The engine was in it when I first looked at, so I know this set up did work. The truck was inspected and running. The cab has gone to old Rusty C10 (needed a lot of work), bought a 72 C20 with a 402 Th400, low mileage, fixed that cab, have put the 402 in the frame with new motor mounts, am ready to put cab back on. QUESTION! Exhaust manifold hits frame, just barely, on driver's side. Don't have the motor mount pads from the previous engine, just bought new ones from NAPA, what needs to be done to make manifolds clear frame? By the way, this truck has original NP205, and every thing is moved forward so there is more clearance between firewall and back of engine already.
Thanks in advance
GM

breeh · 07-19-2003, 04:47 PM

When I put the 427 in mine I had to trim the frame a little bit with a grinder but, on mine, it was the passenger side that needed clearancing.

GM72K10 · 07-19-2003, 06:20 PM

Frame already is trimmed on passenger side, so maybe I just need to do the same for driver's side. Thanks
GM

**kwmech** · 07-19-2003, 08:41 PM

Long ago when I did a big block in my 71, I used some factory triangle shaped spacers between the mount and the block. If I remember they were about 1/4'' thick. That did the trick for me back then.

07-19-2003, 02:48 PM	#1
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,483	BBC in 72 4X4 motor mount ?s Ok To make a long story short, last year I got free, yes free a 72 GMC K2500 4x4 454 auto TH400, 3:73 gears, but MINUS the engine. As if I needed another one but free is real hard to say no at. The engine was in it when I first looked at, so I know this set up did work. The truck was inspected and running. The cab has gone to old Rusty C10 (needed a lot of work), bought a 72 C20 with a 402 Th400, low mileage, fixed that cab, have put the 402 in the frame with new motor mounts, am ready to put cab back on. QUESTION! Exhaust manifold hits frame, just barely, on driver's side. Don't have the motor mount pads from the previous engine, just bought new ones from NAPA, what needs to be done to make manifolds clear frame? By the way, this truck has original NP205, and every thing is moved forward so there is more clearance between firewall and back of engine already. Thanks in advance GM __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck

07-19-2003, 04:47 PM	#2
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	When I put the 427 in mine I had to trim the frame a little bit with a grinder but, on mine, it was the passenger side that needed clearancing. __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

07-19-2003, 06:20 PM	#3
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,483	Frame already is trimmed on passenger side, so maybe I just need to do the same for driver's side. Thanks GM __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck

07-19-2003, 08:41 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,650	Long ago when I did a big block in my 71, I used some factory triangle shaped spacers between the mount and the block. If I remember they were about 1/4'' thick. That did the trick for me back then.



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