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1/31/13 11:37am - Original Message: 'C5 engine for a 68'
rlu1968
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Gordonvillle, TX - USA

Vette(s):
1968 Roadster 427

Joined: 11/28/2003
Posts: 222
Is it possible to put a C5 engine into a 1968 corvette, four speed, that originally had a 427. Would it fit with hood clearance and would their be any problems to get the vacuum for the wipers and head lights.

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1/31/13 4:58pm - Reply: 'Re: C5 engine for a 68'
Sarge81 Lifetime Member
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WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2376
Yes it is possible. It will fit under the hood. Just don't use "truck" accessories. Either try to make the C5 serpentine drive or try to find '98-'02 F-body serpentine drive or aftermarket.  There are more and more C3's being re-powered with LS type engines. It is expensive by the time you purchase all the parts and pieces to do the swap.

I'm in the process of swapping a aluminum block L33 5.3L engine into my '81.
 I just had the block bored out to a 5.7L since this is one of the few 5.3's you can safely bore to a 5.7.
This engine is being built very similar to a C5 LS6 spec except for a slightly hotter cam.

To start with, you'll need to buy:
Engine mounts.
PCM w/ wiring harness
Electric cooling fans
Electric fuel pump w/C5 filter regulator
Bellhousing/Clutch assy.w/flywheel
Hydraulic clutch conversion kit. Unless you want to go through the hassle of keeping it mechanical.
Exhaust headers, then modify the exhaust system to make it work.

Then you have to mess around with sensors and sending units to make your stock gauges work and also work with the PCM. Or change all the gauges over to electronic ones that work with. Since your tach and speedo are cable driven you'll need a converter box to convert mechanical to electronic signal for the PCM.

I'm know I'm missing a few things, but this will give you an idea of where to start.

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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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1/31/13 10:22pm - Reply: 'Re: C5 engine for a 68'
rlu1968
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Gordonvillle, TX - USA

Vette(s):
1968 Roadster 427

Joined: 11/28/2003
Posts: 222
Thanks for the info. It looks to be a much more work than I thought it would be. I really don't want to change the gauges or take away from the interior looks of the 68, I am just wanting a hot dependable engine, and I was thinking maybe a newer model engine with less problems. I have a 350 now and it does not have the power. I could go back with the 427 original engine, but an older engine may have problems. 
Maybe a GMC crate engine 454?? To a certain point the cost isn't a concern. I just want it to be dependable, and powerful.  


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2/1/13 10:22am - Reply: 'Re: C5 engine for a 68'
tonytheroofer
Former Member
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Rochester, NY - USA

Vette(s):
1980 L- 82 fully restored and upgraded.

Joined: 6/12/2012
Posts: 95
If cost is not an issue get a fuel injection set up on a strong crate motor or one you rebuild. The advantage of doing that is MPG and engine operation and management is way more accurate then a motor with a carb.

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1980 , ZZ430 , 3.92 rear , 700R4 2400 stall NEW EZ EFI 
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