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KyleG KyleG
New User | Posts: 12 | Joined: 12/12
Posted: 12/05/12
11:43 PM

Alright, I was recently told my carb is holding me back a lot of power. Its a Holley 600. My motor is a 350 .30 over, 9:5 flat tops, 508 lift 313 duration Hydraulic cam and lifters, arp rockers, 327 64cc double hump heads, guide plates and studs and it has a edelbrock intake and black jack headers. Thats pretty much the some up. Also turbo 400 and 4.11 rear gear

What power do you think it could be making and how much would it with a bigger carb?

^If anything sounds funny, let me know. Its 2 in the morning here lol  

redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 12/06/12
02:33 AM

that sounds like an aweful lot of cam for a truck.   were talking about your truck, correct?    since that cam is made more for top-end power, id say its possible the carb could be a little bigger.    what RPM do you shift it at?   what stall converter do you have?  

   im bad at guessing HP, maybe 350-375HP/TQ, with a proper tune?   any port work done to the heads?  

76Skylark 76Skylark
Guru | Posts: 854 | Joined: 12/11
Posted: 12/06/12
06:20 AM

If anything the Small carb is helping more than hurting and may be the reason it has any power down low. you can make a little more power in an area that is Not where the engine spends Most of its time (high RPM),but you will lose low power and buy more gas. SPEED COST'S MONEY HOW FAST DO YOU WANT TO GO !  

76Skylark 76Skylark
Guru | Posts: 854 | Joined: 12/11
Posted: 12/06/12
06:21 AM

My Answer to that Question is,   Very Fast!  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 12/06/12
07:42 AM

Icon Quote76Skylark:
If anything the Small carb is helping more than hurting and may be the reason it has any power down low. you can make a little more power in an area that is Not where the engine spends Most of its time (high RPM),but you will lose low power and buy more gas. SPEED COST'S MONEY HOW FAST DO YOU WANT TO GO !

+1  
68scott385 68scott385 68scott385

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 12/06/12
07:49 AM

Icon Quoteredneckjoe69:
that sounds like an aweful lot of cam for a truck.   were talking about your truck, correct?    since that cam is made more for top-end power, id say its possible the carb could be a little bigger.    what RPM do you shift it at?   what stall converter do you have?  

   im bad at guessing HP, maybe 350-375HP/TQ, with a proper tune?   any port work done to the heads?


You can overlook the packaging with gears like that and looks to have a 26" or 27" tire on it.  Those trucks weren't as heavy as you'd think. Half-ton short-step side, probably weighs between 3500 and 3750 empty.  
68scott385 68scott385 68scott385

fliplopoo fliplopoo
New User | Posts: 1 | Joined: 12/12
Posted: 12/06/12
12:00 PM

Degree on the cam,matching fuel octane to actual compression, lbs, distributor advance curve kit if its locked undo this. hotter coil. 1.6 rockers or not. ck valve springs, turn 7500 ok. NEED MORE INFO! But not bigger carb. Fuel read a spark plug. Should look like you just bought them.  

KyleG KyleG
New User | Posts: 12 | Joined: 12/12
Posted: 12/06/12
04:33 PM

the intake is a torker II, 2200 stall, Holley 600 4160, daily driver, motor revs to 6500-7000 but I haven't had it over 4500 when driving, and black Jack headers. Not to sure the specs. No porting on heads

The man at the Machine shop said the cam is good for the motor, he ordered it when we got the block done. He said its what He would run in his personal builds

Motor is still pretty new, cam degree is neutral (Straight up), all I know about the rockers are they are arp, we have the timing pretty close I'd say. The plugs seem to be doing there job like they should.

If I missed anything, let me know. I'll try to find it out for ya  

KyleG KyleG
New User | Posts: 12 | Joined: 12/12
Posted: 12/06/12
04:33 PM

Oh, and yes in the truck lol  

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 12/06/12
07:45 PM

You should check the spark plugs. If they are almost white I'm guessing they will be.
  Either jet that 600 up or put a 650 to 750 Carb. Don't go any bigger then the 750. If you know anyone that you can borrow a bigger carb from try it before you buy one. The headers alone will lean that 600 out.
  If you are running a i.e. J-8 Champion spark plug go colder to a J-6. Let me know what who's plug your running I'll give you a heat range.

Bob  

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 12/06/12
08:03 PM

KyleG

Don't be too concerned about the lift .508 is not really big. What's the duration @.050. Thats what will give you a lopey idle, and make horse power up high RPM. If you had .313 duration @.050 you wouldn't have enough  torque convertor to make it idle.
  Back in the day a 350/327 if you had it tuned, and the valves/or lifters set correctly you could spin a small block to 6500RPM. They had Nothing near the Cam you have. Just be careful about the rods and crank. Stock Rods and Stock Crank really don't like constant high RPM.
  The 600 Carb. is making it seem like a rocket ship because the engine is running Lean. Watch your water temp also. If you live where its cold it, you  probably won't have high water temps. I'm surprised its not pinging or detonating its arrzz off.

Bob  

KyleG KyleG
New User | Posts: 12 | Joined: 12/12
Posted: 12/06/12
09:04 PM

The temp stays at like 160-170, the plugs are autolight 26s. The crank has been turned .20 .20 , and stock rods. It idles at 500-550 in gear and will sometimes try to die on me. I just tap the gas and it goes back fine. I really don't hot rod it though, the trucks been in my family for about 29 years now. Not saying I haven't played some, but for the most I just ease around. The oil pressure goes from 40 to 100. At 50 mph on a back road in 3rd the oil pressure is at 60-65. I'm running i think 92 octane gas (whatever the middle grade gas is)  

002 1
^How it sits  

skyeking skyeking
Addict | Posts: 2738 | Joined: 08/09
Posted: 12/07/12
04:19 PM

Hi there,
 I had a Holley 600 on a 355 with 10/1 comp and 222
cam. .496 lift. Fuel pressure was 7to8 lbs @ 2000.
 performer was keeping power to 4860rpm. not enough.
 yours is too much... inlet manifold off ZZ4 355hp
 with 180*s would suit you fine if you tried it.  
skyeking