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Discussion Starter #21
Thanks very much for that info Wiz. In speaking with the folks at Bowtie, they recommended the Holly Sniper Kits. Any opinion on those? They seem to get good reviews. I was leaning toward the FAST kits in the past.


NEVER frame mount. Fuel pumps belong submerged in the tank. It is quiet. It is safe. It keeps the pump cool. So this is actually a pretty easy and painless thing for you to do. You need to goto eckler's or somewhere and buy yourself a 1982 fuel sender. here is a link to that: https://www.ecklerscorvette.com/corvette-fuel-sending-unit-without-pump-1982.html

And you will need a good pump. Some efi kits have options to come with a fuel pump. Or you can goto summit and buy this: https://www.summitracing.com/parts/vpn-f90000274
And this: https://www.summitracing.com/parts/vpn-400-1162/overview/

If you want to see what all this looks like going together I have detailed it in a FAST 2.0 efi kit I installed in a '81 right here: https://www.digitalcorvettes.com/forums/showthread.php?t=255809

I have also detailed setting up a FAST 2.0 efi kit on a 454 big block in a 1971 right here: https://www.digitalcorvettes.com/forums/showthread.php?t=242889

And I walk through the installation of a FiTech kit in a 1968 right here: https://www.digitalcorvettes.com/forums/showthread.php?t=263034

What type or brand of fuel injection kits have you been looking at? I am very fond of FAST 2.0 easy efi because of it's 1350cfm throttle body. I mean, That is HUGE.
 

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Thanks very much for that info Wiz. In speaking with the folks at Bowtie, they recommended the Holly Sniper Kits. Any opinion on those? They seem to get good reviews. I was leaning toward the FAST kits in the past.

I have not had a chance to install a holley sniper yet. And for a reason. While they look better than FiTech and in most ways are, The FiTech throttle bodies are all 850cfm. All the comparable holley sniper products are 800cfm. Not much but we are used to the 1350cfm of the FAST and 850 is already 500cfm less than that. the holley product is 550cfm less potential than the FAST 2.0 stuff.


For some reason all these aftermarket efi companies are rating their hp support by fuel injector size. So all the companies have different fueling options but seemingly they all use a common t.b. for that company. FAST is hands down the best. By leaps and bounds. And then some. And it's price reflects this. I also installed a fast 2.0 on a big block caddy motor in a monster truck. That can be seen here: https://www.digitalcorvettes.com/forums/showthread.php?t=252282

If you do install a holley sniper, or whichever you go with, please do a good write up with a bunch of pictures for all of us here on DC. We can't get enough of that type of stuff.
 

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Discussion Starter #23
Have any of you ever used the plastic mockup models like these guys make?
https://www.mockupmotors.com/700-R4-Transmission-5021.htm
My friend thinks it would be a good idea to get replicas of the 454 big block and 700R4 to install and check for clearance and fit. If I were really sure I could resell them for at least 75% of what I paid for them I might do it, but I can't afford to get stuck with nearly $1000 worth of plastic models just for one job.
Thoughts?
 

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Have any of you ever used the plastic mockup models like these guys make?
https://www.mockupmotors.com/700-R4-Transmission-5021.htm
My friend thinks it would be a good idea to get replicas of the 454 big block and 700R4 to install and check for clearance and fit. If I were really sure I could resell them for at least 75% of what I paid for them I might do it, but I can't afford to get stuck with nearly $1000 worth of plastic models just for one job.
Thoughts?

I think that would be a gross waste of the money. Honestly the Big Block was an option for half of the c3's life. the motor will drop in. If you want the 700r4 to go in without any trouble than just buy a specific crossmember and it will be a drop in thing. You could get something like this from bowtie overdrives: https://www.bowtieoverdrives.com/catalog/catalog_inc/viewitem.php?ITEMID=112

I have actually installed a few of these. Here is one installed with the 700r4..




And that is in the same year car. 1978. Pace car. So it will definitely fit. Here is a shot of up top..



But no big block here.
 

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The Bellhousing is prone to cracking on 700 R4 and 4L60E with Big Block Torque and Hp.
The Band Aid Fix in the past was to use a Chevy K truck case. Casted thicker.

Turbo 400 is way stronger.
4L80e is a Turbo 400 with Overdrive.
 

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There is no weak link on a Turbo 400 till you exceed 800 Hp.
A $100 part makes it good for 1200 Hp.

A 4L80E only weak link is the stock torque converter.
 

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Discussion Starter #28 (Edited)
We were a little concerned about the height of the valve covers on that big block against the brake booster. We thought about looking for a smaller booster. Have you ever seen an issue with clearance there?

Also, a question for wiz...if we drop in that 454 and 700r4, are the only mods we'll have to make the engine mounts and that crossmember you listed? Everything should drop right in after that?
 

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We were a little concerned about the height of the valve covers on that big block against the brake booster. We thought about looking for a smaller booster. Have you ever seen an issue with clearance there?

Also, a question for wiz...if we drop in that 454 and 700r4, are the only mods we'll have to make the engine mounts and that crossmember you listed? Everything should drop right in after that?
So you will need to chase down 1968-1974 BB corvette valve covers. The drivers side has a relief to clear the booster. If you look at this ad you will clearly see what I am talking about: https://www.jegs.com/i/Speed-Energy-Drink/592/140418/10002/-1?CAWELAID=230006180040097899&CAGPSPN=pla&CAAGID=44693592161&CATCI=aud-194567928791:pla-224363292071&catargetid=230006180039218437&cadevice=c&jegspromo=nonbrand&gclid=Cj0KCQjw45_bBRD_ARIsAJ6wUXRQK6tuWy_8yGdOuanFClSogoDu0GeIfUphFaKbl3ADnrCHMysEDSIaAnwWEALw_wcB

I think we shortened the driveshaft or swapped the slip yoke. But no fears. In a worst case scenario, you could just hunt down a driveshaft for a 1982. The last year of the c3 the car came with a 700r4.
 

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so the engine and trans are out and we're in the process of removing/replacing stuff in the engine compartment. I'm removing all the vacuum stuff for the lights as we're converting to electric. Can someone tell me what this is? It sits right under the brake booster.
https://photos.app.goo.gl/MecUyKCEBfW74SkX9
That is a part of your cruise control. We usually eliminate those and get a speedometer cable for a car without cruise control. That is if you are deleting the cruise.
 

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Discussion Starter #33
Wiz, am I going to need to use the big block or small block mounts for this 454? Also, should I use an early c3 big block oil pan?
 

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Run a stock BBC oil pan if on a budget.

Really want at least an 8 quart racing pan.

12 quarts better yet.
 

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Wiz, am I going to need to use the big block or small block mounts for this 454? Also, should I use an early c3 big block oil pan?
There are 2 different mounts used for c3 corvettes. BB and SB share the same mounts. The difference is the width of the frame perch. On the side of the engine mount that attaches to the frame, you will need to measure the width between the ears of the mount, OR measure the width of the frame perch where the mount sits. I think some were 2" and some were 2 5/8" or something along those lines. I strongly recommend energy suspension urethane mounts. They have very little deflection. you will either need these:
https://www.jegs.com/i/Energy-Suspension/355/3-1117G/10002/-1?CAWELAID=1710908731&CAGPSPN=pla&CAAGID=15769068431&CATCI=aud-194567928791:pla-192398311031&CATARGETID=230006180037474585&cadevice=c&gclid=CjwKCAjw2MTbBRASEiwAdYIpsXierBQ83LbctbBWtmXmVt9vPreGs1iZli6bLaS28mp7irA2mze14BoCBioQAvD_BwE
Or these:
https://www.jegs.com/i/Energy-Suspension/355/3-1114G/10002/-1
 

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If you use a High volume oil pump be sure to use an aftermarket high capacity oil pan made for Road race.
Or Drag Race for what your intentions are.

Stock pan use a stock oil pump only.

High volume pump you run the risk of sucking the pan dry at high rpms.

Grumpy has 50 pages on this topic.
Worth reading all.

Always used a drag race pan on my TA.
HIGH Volume high pressure oil pump I use.
9 quarts in the pan.
 

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i have the gold Crane alum-body roller rockers under my cast alum valve covers. you can't run the tall valve covers, probably wouldn't be able to remove them to check valve lash, etc, with the factory booster, but you can use the medium-height valve covers. Mine aren't pretty, but you get the idea for clearance by the stock factory brake booster.


also, I have a 700R4 in my car, if you use the trans mounting boss that's part of the trans case, instead of the trans mount on the tailshaft housing, you can adapt the C3 TH350 adapter that goes in front of the trans cross member, I think you just have to elongate the slot, something like that. for my TCC engage, i only use the 4th-gear pressure switch. I found that the vacuum disconnect switch, and the brake light switch disconnect were not conducive to around-town driving and highway cruising, actually, they were annoying. The trans has been fine for quite a few years now, it's got a few extra clutches, other fixes that were recommended in the ATSG tech manual. I used it as my daily driver off-and-on for about 10 yrs. it looks it.

Once I had the engine in, and the trans mounted, I took some measurements and ordered up a driveshaft from Denny's. They were pretty quick, fit perfect (of course, dependent on my measurements). I used Moroso solid steel motor mounts, and a polyurethane trans mount. Do not ever use a steel trans mount, for sure you'll crack the trans case, regardless, whether it's a Powerglide or a 4L80E.

I used the LS7 (BBC) oil pan, not compatible with the PS hydraulic ram. drove it with no PS for a long time, just recently installed the Borgeson box. Obviously, the 1970-vintage LS7 Mark IV BBC oil pan is not compatible with a Gen V BBC (1-piece rear main seal).

I had Hedman headers, but recently installed cast iron exhaust manifolds. I generously ported the insides of the exh manifolds, gasket matched the ports, and hogged out the outlet to 2-3/4". and used 2-3/4" SS exhaust pipes to the crossmember, 2-1/2" to the back.
 
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