carb sizing help
Thread Starter
Pro
Joined: Mar 2008
Posts: 702
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carb sizing help
I was given a holley 600 dp that needs a rebuild for my motor. I am wondering if it will be enough...
383
edelbrock torker 2 single plane
ported 113's with 2.00 valve
230/230 cam with .560 lift
383
edelbrock torker 2 single plane
ported 113's with 2.00 valve
230/230 cam with .560 lift
Pro
Joined: Feb 2002
Posts: 709
Likes: 10
From: Carlsbad CA
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Pro
Joined: Feb 2002
Posts: 709
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From: Carlsbad CA
I just put a 2-plane edelbrock and a holley 650cfm, with vacumn secondaries on my 71 350/auto with a mild cam, no headers. this carb works great but it doesn't have much left at wot. With your 383/auto, I don't think you would be very happy with the the 600. By the time you have it rebuilt the difference in cost would be well worth it. I would look at a 750 but nothing smaller than 650 cfm.
Good luck.
Good luck.
Last edited by hdpete98; Sep 30, 2009 at 08:26 PM.
Race Director
Joined: Oct 2000
Posts: 14,955
Likes: 79
From: central FL, near the beach.
size looks very good! with a single plane all 8 cyl use the entire carb.
Most guys use a dual plane, each half of the carb feeds 4 cyl, then it is iffy.
if u put a kit in it yourself, try it!
Most guys use a dual plane, each half of the carb feeds 4 cyl, then it is iffy.
if u put a kit in it yourself, try it!
Race Director
Joined: Oct 2000
Posts: 14,955
Likes: 79
From: central FL, near the beach.
take the bowls off, etc., is it clean or full of dried gas? 
if it looks ok, get a spray can of carb cleaner and blow thru every passage.
If for some reason u decide to sell it, it will fetch much more rebuilt, like 75-$100
I don't think it is the best carb, but it could run a lot better than many, so the price is right, try it!
if it looks ok, get a spray can of carb cleaner and blow thru every passage. If for some reason u decide to sell it, it will fetch much more rebuilt, like 75-$100
I don't think it is the best carb, but it could run a lot better than many, so the price is right, try it!
Race Director
Joined: Apr 1999
Posts: 11,520
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From: CORVETTE 77 385 C.I. TEXAS
AFR put a 600 DP on a dual plane 383. You can get a larger carb later.
Race Director
Joined: Apr 2000
Posts: 17,649
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Seriously not trying to start anything or make anyone feel bad but that formula comes up all the time ( whatever math class it came from ) and it just makes me feel I have to say something to clear thngs up. Putting anything smaller than 750cfm (Holley square bore type ) on healthy 383ci is nonsense.
The 650cfm is good for a slightly warmed over 355ci although I had a Holley 750DP mechanical secondaries on my warmed over 355ci which made ~300RWHP and 330RWT and had very nice street manners with a single plane Vr Jr intake manifold and solid fllat tappet cam
Le Mans Master
Joined: Nov 2008
Posts: 5,691
Likes: 12
From: columbus oh
Trying to put this in a nice way but every time I see that formula I cringe. Would you use a the same size carb on a 300HP 383ci that you would use on a 550HP 383ci. ?
Seriously not trying to start anything or make anyone feel bad but that formula comes up all the time ( whatever math class it came from ) and it just makes me feel I have to say something to clear thngs up. Putting anything smaller than 750cfm (Holley square bore type ) on healthy 383ci is nonsense.
The 650cfm is good for a slightly warmed over 355ci although I had a Holley 750DP mechanical secondaries on my warmed over 355ci which made ~300RWHP and 330RWT and had very nice street manners with a single plane Vr Jr intake manifold and solid fllat tappet cam
Seriously not trying to start anything or make anyone feel bad but that formula comes up all the time ( whatever math class it came from ) and it just makes me feel I have to say something to clear thngs up. Putting anything smaller than 750cfm (Holley square bore type ) on healthy 383ci is nonsense.
The 650cfm is good for a slightly warmed over 355ci although I had a Holley 750DP mechanical secondaries on my warmed over 355ci which made ~300RWHP and 330RWT and had very nice street manners with a single plane Vr Jr intake manifold and solid fllat tappet cam
especially about that dumb azz formula on any kind of performance engine jmo
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
no NA engine will give that. maybe close but not quite.
if it is a well tuned, efficient, large valve engine that say was giving 90% of what it was capable of the 600 would be perfect
660*.9=594cfm
if you already have the carb and it is a manual. go for it.
Race Director
Joined: Oct 2000
Posts: 14,955
Likes: 79
From: central FL, near the beach.
the 113's are ported to what? they are only 163 cc stock. about the worst head for a 383. flowing 600cfm at 1.5 is unlikely, more like 550.
a 600 DP will flow 780 cfm at 3" of vacuum.
i'd rather have the 600 DP any day on this combo
Last edited by Matt Gruber; Sep 28, 2009 at 07:18 AM.