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Topic: 396 enginw swap

in Forum: C3 Engines

396 enginw swap

Posted: 8/8/15 2:00pm Message 1 of 4
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leesburg, FL - USA
Joined: 7/19/2014
Posts: 195
Vette(s): 1979 coupe and now 2007 c-6
kstyer,sarge81     I have my old/new  396 race engine  siiting in a corner   can I  unstall this in my 1979 c-3   without great amount of money and time    what do you think   this is only a thought       something to think of in winter  dwaBeer


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Re: 396 enginw swap

Posted: 8/8/15 6:50pm Message 2 of 4
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WEST SENECA, NY - USA
Joined: 12/3/2001
Posts: 2379
Vette(s): 1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.
Sounds like a cool idea, but I would say not a good idea in my opinion.

You'll have to change out the front springs to big block springs due to the additional weight. Then the car will be nose heavy compared to the small block. There are a couple big block C3's around my area and the owners say they don't handle as well as a small block car.
I believe you'll have to upgrade the radiator as well. Then you'll have to get Corvette specific water pump and drive accessories for the 396. 

I don't know if you have a auto or manual transmission. If its a race engine with a radical cam, you'll need a stall converter for a automatic and maybe have the transmission freshened up to handle the extra power. If you have a manual transmission, you'll probably have to put a fresh clutch/pressure plate in. Make sure your u-joints are in good shape to. 

That's all I can think of for now. I know Joel and kstyer will add a bunch of "pitfalls" to be aware of.




GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.
3.54 Dana 44
'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975




Click here to see more pics of my Vette on CarDomain.


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Re: 396 enginw swap

Posted: 8/8/15 7:22pm Message 3 of 4
Former Member
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leesburg, FL - USA
Joined: 7/19/2014
Posts: 195
Vette(s): 1979 coupe and now 2007 c-6
thanks     that's what I think    you told me what I needed to know   396 will sit in corner  thanks dwaBeer


Re: 396 enginw swap

Posted: 8/8/15 8:47pm Message 4 of 4
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
Not just the radiator, but the overflow system and cooling fan and clutch. Heavier motor mounts. Don't forget the larger diameter u joint yoke shafts in the rear diff, and wheel yoke bearing shafts. Of course that means a different dif. Can you do the swap without all of this? Of course. But it's there for a reason. You may not like the results without them. Of course some small blocks make a lot of power and our cars handle that, but ALL the other issues still exist. And big blocks always handle worse due to the weight. I would not do a conversion. But having said that, a big block car is still a load of fun, and yes I would love to own one.


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