[C1] Who among you has installed a big block Chevy engine in a 57 Corvette ?
#41
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#42
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I recently picked up a '66 427 Vette motor attached to a 5-speed in a 26 Ford Coupe frame. I was thinking I might try and put it into y '59. After a lot of thinking....I realized I don't have the time. Probably end up reselling the lot
#43
Le Mans Master
LS6 Intake
I know everyone says you have to cut the hood. However I have never found anyone who can say they tried the LS6 low rise intake. If you've ever seen one the runners actually go down from the ports. I think it was originally designed for the C3 corvette but found greater usage in the 1970 Chevelle. I will post a picture and actually measure the carb pad height this week. I would really like to do this but I will not cut my hood on my C1
Carb pad height as measured in the first drawing is 2 3/8 front and 3 3/4 rear. I don't know what the carb pad numbers for the L72 intake are but I am sure they are much more than this. I believe this is the lowest BBC intake ever made by anyone. It was widely used on the 1970 Chevelle LS6. I believe it was designed for the C3 but have no way to prove that except it is lower than need be in the Chevelle. This one when viewed in side profile, you can see how low it really is. 4 of the intake runners actually go downhill from the port to the plenum. I gotta believe this is detrimental to intake flow. I find it really hard to believe this would not work on a C1 without cutting the hood but of course that is just speculation. The only way to know is to try it and by then you would be so far down the road it would be hard to turn back and as I said, I really do not want a hole in the hood.
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#44
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Carb pad height as measured in the first drawing is 2 3/8 front and 3 3/4 rear. I don't know what the carb pad numbers for the L72 intake are but I am sure they are much more than this. I believe this is the lowest BBC intake ever made by anyone. It was widely used on the 1970 Chevelle LS6. I believe it was designed for the C3 but have no way to prove that except it is lower than need be in the Chevelle. This one when viewed in side profile, you can see how low it really is. 4 of the intake runners actually go downhill from the port to the plenum. I gotta believe this is detrimental to intake flow. I find it really hard to believe this would not work on a C1 without cutting the hood but of course that is just speculation. The only way to know is to try it and by then you would be so far down the road it would be hard to turn back and as I said, I really do not want a hole in the hood.
I just measured my L88 intake (#3886093) and it measures 5 5/8 rear and 4 1/8 front, so that is nearly 2 inches taller than your LS6 intake. I am inclined to think that just may be enough to avoid cutting the hood. Of course a dropped base air cleaner would be required and there is the possibility that an air cleaner could not be used.
Thanks,
Rex
#46
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I WILL NOT argue for 2sec about the awesome power/torque that a big cube BB will produce. There is no question about it.
I just really like the simplicity and ease of working on a small block. And to that end, it is difficult to ignore a big cube, roller cam, good breathing SB400. Just a .030-.040 bore and a .100 stroke and suddenly you have 420 cubes, and can easily go on up to 427 cubes. With a .500+ roller cam and good flowing alum heads-------------------all on a factory GM cast block and the results are staggering for a small block------------------------------AND EVERYTHING FITS WITHOUT MODIFICATIONS!!!!!!!!!!!! EVEN HEADERS!!!!
For the 56, I chose to kind of stay docile. It has a .030 bore (406), .510in lift hyd cam, 2 1/2in ex manifolds and full ex system with a single air meter Bill Thomas hogged out FI unit. My drag racing days are over, so it make for a great stop light, city cruiser, Interstate car with no issues (well, it's a little warm in the Okla summers).
I just really like the simplicity and ease of working on a small block. And to that end, it is difficult to ignore a big cube, roller cam, good breathing SB400. Just a .030-.040 bore and a .100 stroke and suddenly you have 420 cubes, and can easily go on up to 427 cubes. With a .500+ roller cam and good flowing alum heads-------------------all on a factory GM cast block and the results are staggering for a small block------------------------------AND EVERYTHING FITS WITHOUT MODIFICATIONS!!!!!!!!!!!! EVEN HEADERS!!!!
For the 56, I chose to kind of stay docile. It has a .030 bore (406), .510in lift hyd cam, 2 1/2in ex manifolds and full ex system with a single air meter Bill Thomas hogged out FI unit. My drag racing days are over, so it make for a great stop light, city cruiser, Interstate car with no issues (well, it's a little warm in the Okla summers).
Last edited by DZAUTO; 09-25-2018 at 11:53 AM.
#47
Le Mans Master
Awesome car
I WILL NOT argue for 2sec about the awesome power/torque that a big cube BB will produce. There is no question about it.
I just really like the simplicity and ease of working on a small block. And to that end, it is difficult to ignore a big cube, roller cam, good breathing SB400. Just a .030-.040 bore and a .100 stroke and suddenly you have 420 cubes, and can easily go on up to 427 cubes. With a .500+ roller cam and good flowing alum heads-------------------all on a factory GM cast block and the results are staggering for a small block------------------------------AND EVERYTHING FITS WITHOUT MODIFICATIONS!!!!!!!!!!!! EVEN HEADERS!!!!
For the 56, I chose to kind of stay docile. It has a .030 bore (406), .510in lift hyd cam, 2 1/2in ex manifolds and full ex system with a single air meter Bill Thomas hogged out FI unit. My drag racing days are over, so it make for a great stop light, city cruiser, Interstate car with no issues (well, it's a little warm in the Okla summers).
https://www.youtube.com/watch?v=V1I9q3QAMac
I just really like the simplicity and ease of working on a small block. And to that end, it is difficult to ignore a big cube, roller cam, good breathing SB400. Just a .030-.040 bore and a .100 stroke and suddenly you have 420 cubes, and can easily go on up to 427 cubes. With a .500+ roller cam and good flowing alum heads-------------------all on a factory GM cast block and the results are staggering for a small block------------------------------AND EVERYTHING FITS WITHOUT MODIFICATIONS!!!!!!!!!!!! EVEN HEADERS!!!!
For the 56, I chose to kind of stay docile. It has a .030 bore (406), .510in lift hyd cam, 2 1/2in ex manifolds and full ex system with a single air meter Bill Thomas hogged out FI unit. My drag racing days are over, so it make for a great stop light, city cruiser, Interstate car with no issues (well, it's a little warm in the Okla summers).
https://www.youtube.com/watch?v=V1I9q3QAMac
#48
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I saw this one at the Tri Five Nationals this year. Sorry I didn't get better pictures of the frame. One bad *** car.
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Loren Smith (09-30-2018)
#49
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The column tach was part of the Airbox pkg, RPO579D. The regular tach (center of dash under the radio) was omitted and the hole covered with a front/rear emblem. I kept mine when I added the column tach, which is a plain (NO red line) 8000rpm tach made by AC.
#50
Le Mans Master
https://www.ebay.com/itm/1956-1957-C...E/263493679868
................................and that is why I don't want a hole cut in my hood!
................................and that is why I don't want a hole cut in my hood!
#51
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No Rex, I don't. The engine was installed prior to my purchasing it. It has been over 27 yrs since I owned it. I wish I could provide more info but I don't have much in the way of records on this car.
Last edited by Dan Hampton; 09-29-2018 at 03:53 PM.
#52
Le Mans Master
Let me just throw this out there and see what you all think Correct me if I am wrong, but I believe the distance from motor mount bosses on the block and the bellhousing edge where the trans meets the block, are the the same for big block and small block. In other words all the difference in length occurs in the front of the engine ahead of the mounts. Assuming this is correct, I am contemplating putting side mounts on my C1 so it could mount either a big block or a small block. This would allow me to try a big block, bare block with heads and intake to check hood clearance without going to something that is irreversible. Since I don't really like the stock mount sandwiched between the block and the water pump anyway this would allow me to go with the sbc if the hood clearance is a problem. What say ye?
#53
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Let me just throw this out there and see what you all think Correct me if I am wrong, but I believe the distance from motor mount bosses on the block and the bellhousing edge where the trans meets the block, are the the same for big block and small block. In other words all the difference in length occurs in the front of the engine ahead of the mounts. Assuming this is correct, I am contemplating putting side mounts on my C1 so it could mount either a big block or a small block. This would allow me to try a big block, bare block with heads and intake to check hood clearance without going to something that is irreversible. Since I don't really like the stock mount sandwiched between the block and the water pump anyway this would allow me to go with the sbc if the hood clearance is a problem. What say ye?
JIM
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Vette5311 (09-30-2018)
#54
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Let me just throw this out there and see what you all think Correct me if I am wrong, but I believe the distance from motor mount bosses on the block and the bellhousing edge where the trans meets the block, are the the same for big block and small block. In other words all the difference in length occurs in the front of the engine ahead of the mounts. Assuming this is correct, I am contemplating putting side mounts on my C1 so it could mount either a big block or a small block. This would allow me to try a big block, bare block with heads and intake to check hood clearance without going to something that is irreversible. Since I don't really like the stock mount sandwiched between the block and the water pump anyway this would allow me to go with the sbc if the hood clearance is a problem. What say ye?
Side mounts will reduce the "available" space for headers. Just another part of the equation.
#55
Le Mans Master
Yep.............
#56
Le Mans Master
Jim Meyer
This is the front end I used. Front steer. The steering u joint goes to frame mount point of old steering box. If you can picture that. 3 u joints with a heim bearing mounted to frame.
#57
Le Mans Master
Intake height
ok I've decided to attack this from a different angle. I need to establish a baseline to calculate from. So.........does anyone know the tallest intake that will fit under the stock hood of a 57? I called Edlebrock and they said they did not know but they do know an air gap intake is to high. Has anyone here ever tried the 327 GM high perf intake from a 365 hp or is it to tall also? OR does anyone have a stock 2x4 intake and can measure it as described in the drawing posted above?
thanks for any help.
thanks for any help.
#58
Melting Slicks
My Arctic Blue 57 that Dan Hampton has now, had a 283 with 66-67 350Hp intake with Holley carb and drop base air cleaner. Fit fine under stock hood. I thought Rex started this post about BBC,and now we are talking SBC?
#59
Le Mans Master
No still bbc..........
thanks. I'm just looking for a known reference point to get measurements from so I have a baseline that fits and can then compare it to bbc measurements. Did you have the stock mount between the block and water pump? Thanks again for the information.
#60
Melting Slicks
Yes, it was a stock 283-270HP with single holley. Not sure how much clearance there was between air cleaner lid and hood. Dan should be able to give you an idea.