oem carb size
Thread Starter
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
oem carb size
hi,
I am real new to the world of chevy engines so please bear with me.
What is the CFM rating on the 72 454 engine.
I just picked up a 72 and apparently the oem Qjet needs to be rebuilt. So, I say to myself, "Self, why not an intake and carb upgrade."
I did some searching. I read this a few times. The oem intake on the 454 is kinda restrictive so an upgrade might not be a bad idea.
OK that sounds great now which one. I also read that only the edelbrock Torker II will allow for a square bore carb and still fit the oem hood. Isnt the powerband on the torker II starting at like 2000 rpms.
What will that do for low end off the line power?
I dont want to put too big of a carb on it and kill throttle response but I cant find the oem specs. I looked up online a bunch of carb calculators and they all say for that motor at 80% VE a 600cfm is perfect. That just seems a little small for that big of motor. THe holley page says anywhere from a 650 and up.
Please help and thanks.
Any help would be most greatly appreciated.
I am real new to the world of chevy engines so please bear with me.
What is the CFM rating on the 72 454 engine.
I just picked up a 72 and apparently the oem Qjet needs to be rebuilt. So, I say to myself, "Self, why not an intake and carb upgrade."
I did some searching. I read this a few times. The oem intake on the 454 is kinda restrictive so an upgrade might not be a bad idea.
OK that sounds great now which one. I also read that only the edelbrock Torker II will allow for a square bore carb and still fit the oem hood. Isnt the powerband on the torker II starting at like 2000 rpms.
What will that do for low end off the line power?
I dont want to put too big of a carb on it and kill throttle response but I cant find the oem specs. I looked up online a bunch of carb calculators and they all say for that motor at 80% VE a 600cfm is perfect. That just seems a little small for that big of motor. THe holley page says anywhere from a 650 and up.
Please help and thanks.
Any help would be most greatly appreciated.
Le Mans Master
Joined: Apr 2005
Posts: 6,350
Likes: 423
From: Seattle Area WA
It would be a mistake not to rebuild the 750 cfm q-jet and stick with a dual plane intake like an Edelbrock Performer. A single plane intake is better off for high RPM use, and has a Torker II ever been worth a crap for anyone? If you want a top line rebuild contact Lars or read up on his papers for some great tips.
V8fastcars@msn.com
V8fastcars@msn.com
Thread Starter
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
It would be a mistake not to rebuild the 750 cfm q-jet and stick with a dual plane intake like an Edelbrock Performer. A single plane intake is better off for high RPM use, and has a Torker II ever been worth a crap for anyone? If you want a top line rebuild contact Lars or read up on his papers for some great tips.
V8fastcars@msn.com
V8fastcars@msn.com
Melting Slicks
Joined: Mar 2006
Posts: 2,465
Likes: 0
From: Orange Park Fl
I know on the sbc, the performer is the same height as stock. I thought the BB was the same. Most Q-jets are 750 cfm, but the BB ones are 795. It is a variable cfm carb either way so economy and throttle response are good. I'd rebuild the Q-jet and double check on the Performer fitment. God bless, Sensei
Thread Starter
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
I know on the sbc, the performer is the same height as stock. I thought the BB was the same. Most Q-jets are 750 cfm, but the BB ones are 795. It is a variable cfm carb either way so economy and throttle response are good. I'd rebuild the Q-jet and double check on the Performer fitment. God bless, Sensei
I have been doing some searching around and found these,
http://forums.corvetteforum.com/show...ight=torker+II
http://forums.corvetteforum.com/show...ight=torker+II
http://forums.corvetteforum.com/show...ight=torker+II
http://forums.corvetteforum.com/show...ight=torker+II
http://forums.corvetteforum.com/show...ight=torker+II
all these threads say that the torker II is the only manifold that fits under the stock hood. Its either that or the intake off of a 69 390hp/427 but I cant find one of those anywhere. Looks like I may just be gettiing the leaky oem carb rebuilt and sticking with it. Most of the theads I read said that the torker is not that great but its all you got.
Drifting
Joined: Jul 2004
Posts: 1,695
Likes: 65
From: Kissimmee fl
Finalist 2021 C3 of the Year - Modified
2017 C3 of Year Finalist
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St. Jude Donor '07
Most of the time when the books say that an intake will not fit under a stock hood, they mean with all stock components. If you are not concerned with originality, you can run a slightly taller intake and a drop base air cleaner assembly and have no problem.
Thread Starter
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
cool,
not real concerned with keeping the stock air cleaner (it wasnt there when i got the car)
I guess I need to measure hood clearance now with the after market cleaner that is on it.
Then deck height, then just try to find one that will work.
not real concerned with keeping the stock air cleaner (it wasnt there when i got the car)
I guess I need to measure hood clearance now with the after market cleaner that is on it.
Then deck height, then just try to find one that will work.
Pro
Joined: Nov 2007
Posts: 721
Likes: 105
From: hernando fl
my 72 with a 502 & stock hood will not work with anything but a torker,i measured and checked all the air cleaner & carb combinations that i could think of. the only option i could come up with is an L88 hood.
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Thread Starter
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
there is always the L36 intake off of a 427.
i guess i can get one one of those off of ebay and mock it up before i start bolting anything down.