Robbinsnathan32566
Poster
Posts: 1
Reg: 08-06-18
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 08-06-18 08:00 PM - Post#2742167
Thanks for the add to the group I'm a first time owner I have a 63 Nova all original has straight 6 in car now no trans I'm wanting to do a carb 4.3l and 700r4 swap but not Shure on what mounts would work with bolting it in the 6cyl place. I believe the v8 tbi Mounts are the same but not positive any help greatly appreciated. 
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 raycow
DECEASED
Posts: 27999
Loc: San Francisco, CA
Reg: 11-26-02
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08-07-18 11:25 PM - Post#2742302
In response to Robbinsnathan32566
I don't know how much this will help, if at all, but V-8 engines in 1st gen Novas used unique castings. One difference was in the oil filter area, and there may have been others. Those engines, or at least the blocks, command high prices when you can find one. Also all 1st gen engines, 6 and V-8, used a unique oil pan configuration.
Now with that said, I have seen a lot of V-8 swaps in shows that have been done with "normal" engines, but I don't know what mods needed to be done in order for them to fit.
Ray
| Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive. |
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Rick_L
Member #409
Posts: 28051
Loc: Katy, Tx, USA
Reg: 07-06-00
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08-12-18 09:13 AM - Post#2742822
In response to raycow
A V8 Chevy II does not need the unique Chevy II block with an automatic. The filter relocation on the unique block is for clutch linkage clearance.
A factory Chevy II V8 installation uses a unique Chevy II only oil pan, and you must use a matching oil pump and pickup. You can use a rear sump pan on a V8 as long as you don't have factory power steering and have a notch in the pan for the steering link. You can buy notched pans.
Now to the V6. As long as the 4.3 is one of those that is based on a traditional SBC V8 (essentially a 350 V8 with the front two cylinders lopped off), it will bolt into the chassis using the Chevy II V8 mounts. I don't know if the oil pan will clear but a notch for the steering linkage probably fixes that if there's interference.
The 700-R4 will require you to move the transmission crossmember rearward. Probably the easiest way is to cut the center out of the stock crossmember, move that part rearward, and then weld some additional metal to gusset it fore/aft. This will allow you to bolt the crossmember to the unibody in the original mounting location.
The other thing you'll have to deal with is the Chevy II has a very long engine compartment built for the straight six. You'll either need an extended fan shroud or an electric fan. V8 factory cars had a long shroud - yours will need to be even longer by 4+ inches.
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1983G20Van
Super Senior Member
Posts: 3989
Loc: Hurst, Texas, USA
Reg: 11-13-02
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08-29-18 10:38 AM - Post#2744774
In response to Rick_L
A V8 Chevy II does not need the unique Chevy II block with an automatic. The filter relocation on the unique block is for clutch linkage clearance.
A factory Chevy II V8 installation uses a unique Chevy II only oil pan, and you must use a matching oil pump and pickup. You can use a rear sump pan on a V8 as long as you don't have factory power steering and have a notch in the pan for the steering link. You can buy notched pans.
Now to the V6. As long as the 4.3 is one of those that is based on a traditional SBC V8 (essentially a 350 V8 with the front two cylinders lopped off), it will bolt into the chassis using the Chevy II V8 mounts. I don't know if the oil pan will clear but a notch for the steering linkage probably fixes that if there's interference.
The 700-R4 will require you to move the transmission crossmember rearward. Probably the easiest way is to cut the center out of the stock crossmember, move that part rearward, and then weld some additional metal to gusset it fore/aft. This will allow you to bolt the crossmember to the unibody in the original mounting location.
The other thing you'll have to deal with is the Chevy II has a very long engine compartment built for the straight six. You'll either need an extended fan shroud or an electric fan. V8 factory cars had a long shroud - yours will need to be even longer by 4+ inches.
The 4x4 4.3s in the S10s and M-vans have a very narrow pan that may work if it is not too deep of a sump. The mid 90s square body 4x4 S10s also had a factory oil filter relocation setup that mounted the oil filter on the driverside fender. The TBI 4.3s are not the best engines out there. They tend to run very rough being a 90*V6 without a balance shaft. The 92+ CPI and Vortec 4.3s run much smoother, get better fuel economy and have a lot more power.
| 1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals |
Edited by 1983G20Van on 08-29-18 10:40 AM. Reason for edit: No reason given.
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