Swapping the 4.3L to a RamJet 350 predicament - The 1947 - Present Chevrolet & GMC Truck Message Board Network

x ReAcT x · 06-25-2012, 09:50 PM

First of all i must say i love this website, when i began my frame off i knew nothing about these trucks, and now i know where every damn bolt goes. So i want to thank everyone for the help. So heres my latest situation. Ive got the frame rolling and now its time to put the drivetrain in. Im getting a killer deal on a RamJet 350 ($5500.00)so im curious if the bellhousing on my sm465 transmission will bolt up to the new v8 engine and also i dont know if the engine mounts will have to be moved forward, back, or hopefully stay in the same shape? Ive been searching the forum like crazy and i havent found any solid info yet. And i know this really has nothing to do with my post but N2TRUX ramjet setup is beautiful, im sure everyones already seen it but wow great looking truck.

86c20 · 06-25-2012, 10:04 PM

as far as i no they are all the same expete the l6 the monts have to move for those i think. the bells should also be the same if not there are a ton of those trans out there and you can get one ez same as fly and clutch

x ReAcT x · 06-25-2012, 10:07 PM

You just solved all my problems thank you, ill go ahead and order the engine.

gchemist · 06-26-2012, 07:20 AM

A 4.3 has the same bolt pattern as a 350 SB. It's a direct swap. All accessories will fit too. Motor mounts will also swap. Basically, you're adding two cylinders.

*C-10 simplex* · 06-26-2012, 07:50 AM

Quote:

Originally Posted by gchemist

A 4.3 has the same bolt pattern as a 350 SB. It's a direct swap. All accessories will fit too. Motor mounts will also swap. Basically, you're adding two cylinders.

Please explain further concerning the engine mounts; Can the frame mounts and engine mounts be re-used and in the exact same positions?

rs72z · 06-26-2012, 09:03 AM

Yes. The 4.3 is just a v8 less the front 2 cylinders. The mounts are all the same including acc.

KQQL IT · 06-26-2012, 12:53 PM

You may need a flywheel. I think a ramjet come with a flexplate
Posted via Mobile Device

rs72z · 06-26-2012, 01:34 PM

Quote:

Originally Posted by KQQL IT

You may need a flywheel. I think a ramjet come with a flexplate
Posted via Mobile Device

Good point. I'm not sure how the 4.3 flywheel is weighted.

**N2TRUX** · 06-26-2012, 11:02 PM

Quote:

Originally Posted by x ReAcT x

........ And i know this really has nothing to do with my post but N2TRUX ramjet setup is beautiful, im sure everyones already seen it but wow great looking truck.

Thanks for the kind words. Roger at RPL did an awesome job on the install...

06-25-2012, 09:50 PM	#1
x ReAcT x Registered User Join Date: Apr 2012 Location: Virginia Beach, Virginia Posts: 219	Swapping the 4.3L to a RamJet 350 predicament First of all i must say i love this website, when i began my frame off i knew nothing about these trucks, and now i know where every damn bolt goes. So i want to thank everyone for the help. So heres my latest situation. Ive got the frame rolling and now its time to put the drivetrain in. Im getting a killer deal on a RamJet 350 ($5500.00)so im curious if the bellhousing on my sm465 transmission will bolt up to the new v8 engine and also i dont know if the engine mounts will have to be moved forward, back, or hopefully stay in the same shape? Ive been searching the forum like crazy and i havent found any solid info yet. And i know this really has nothing to do with my post but N2TRUX ramjet setup is beautiful, im sure everyones already seen it but wow great looking truck. __________________ 1986 GMC K15 4.3V6/SM465/NP205 will be converting to 5.3LS E-ROD/AA adapter/SM465/NP205 10 Bolt Axle Rebuild Tutorial: http://67-72chevytrucks.com/vboard/s...d.php?t=536415

06-25-2012, 10:04 PM	#2
86c20 Registered User Join Date: Mar 2012 Location: edgartown mass Posts: 852	Re: Swapping the 4.3L to a RamJet 350 predicament as far as i no they are all the same expete the l6 the monts have to move for those i think. the bells should also be the same if not there are a ton of those trans out there and you can get one ez same as fly and clutch __________________ 1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car

06-25-2012, 10:07 PM	#3
x ReAcT x Registered User Join Date: Apr 2012 Location: Virginia Beach, Virginia Posts: 219	Re: Swapping the 4.3L to a RamJet 350 predicament You just solved all my problems thank you, ill go ahead and order the engine. __________________ 1986 GMC K15 4.3V6/SM465/NP205 will be converting to 5.3LS E-ROD/AA adapter/SM465/NP205 10 Bolt Axle Rebuild Tutorial: http://67-72chevytrucks.com/vboard/s...d.php?t=536415

06-26-2012, 07:20 AM	#4
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Swapping the 4.3L to a RamJet 350 predicament A 4.3 has the same bolt pattern as a 350 SB. It's a direct swap. All accessories will fit too. Motor mounts will also swap. Basically, you're adding two cylinders. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

06-26-2012, 09:03 AM	#6
rs72z Registered User Join Date: Oct 2011 Location: Emory TX Posts: 900	Re: Swapping the 4.3L to a RamJet 350 predicament Yes. The 4.3 is just a v8 less the front 2 cylinders. The mounts are all the same including acc. __________________ ___________________ 78 ccsb dually 5.3 4l60e http://67-72chevytrucks.com/vboard/s...d.php?t=491551

06-26-2012, 12:53 PM	#7
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,273	Re: Swapping the 4.3L to a RamJet 350 predicament You may need a flywheel. I think a ramjet come with a flexplate Posted via Mobile Device __________________ " That didnt make it any newer " " Dont antique the equipment "



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