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Carb choice advise? Summit 500 or 600 cfm

Posted By ianmatt 3 Years Ago
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ianmatt
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Guys I am ready to push the purchase button. I have chosen a summit racing carb for my 292 .060 over, pertronix, header, mummert intake, and original heavy t-98 trans. what are your thoughts on 500 vrs 600 cfm? why? I'm ready let me know and THANK YOU
charliemccraney
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Which cam?


Lawrenceville, GA
ianmatt
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Isky mild
charliemccraney
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specs?


Lawrenceville, GA
ianmatt
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here are the cam specs

ISKY - Grind No./Type E-4 SOLID Low/Mid-Range performance cam. 9.5-1 compr. 3.08-3.70 axle ratio. Passenger cars and trucks. Up to 625 CFM Carb.RPM-Range 2000-5000 Valve Lift - INT .425 EXT .425PART NUMBER: 301444 GRIND NUMBER: e-4 
ENGINE INFO: FORD-MECURY-T-BIRD (Y-BLOCK) V8 272-292-312 C.I. ENGINES APPLICATION: 
SPECIAL REMARKS: SOLID PRODUCT USE: STREET 
RPM RANGE: 2000-5000 
Valve lift is calculated with zero lash and rocker ratio of 1.5 
INTAKE TIMING DURATION: 260 deg. 
OPEN: 22 BEFORE TDC 
CLOSE: 58 AFTER BDC 
CAM LIFT: .283" 
VALVE LIFT: .425" 
VALVE LASH: .015 HOT 
.017 COLD 
EXHAUST TIMING DURATION: 260 deg. 
OPEN: 58 BEFORE BDC 
CLOSE: 22 AFTER TDC 
CAM LIFT: .283" 
VALVE LIFT: .425" 
VALVE LASH: .015 HOT 
.017 COLD 
LOBE CENTER: 108 deg. OVERLAP: 44 deg. CAM ADVANCE: 0 deg. 
THE ABOVE TIMING IS CHECKED AT .020 (OPEN) LIFTER RISE 
.020 (CLOSE) 
The following timing is taken at .050" lifter rise and gives a more accurate determination of camshaft position. 
INTAKE DURATION: 216 deg. 
OPEN: 0 BEFORE TDC 
CLOSE: 36 AFTER BDC 
EXHAUST DURATION: 216 deg. 
OPEN: 36 BEFORE BDC 
CLOSE: 0 AFTER TDC 
RECOMMENDED ISKY CAM KIT PARTS AND SETUP INFORMATION 
LIFTERS: 302-H LIFTER TYPE: SOLID 
SPRING: 6005 TYPE: dual w/damper DIA.: 1.430" RATE: 275 lbs per inch 
INSTALLED HEIGHT: 1.750" SEAT PRESSURE: 135 lbs OPEN PRESSURE: 285 lbs 
COIL BIND: 1.120" 
SPRING SHIMS: # 2 
STEEL RETAINERS: 507-ST 
TITANIUM RETAINERS: 60-TI 
PUSHRODS: 303 TYPE: non adjustable LENGTH: 8.187" DIA.: 3/8" 
ROCKER ARMS: TYPE: RATIO: 
VALVE LOCKS: VL-32 
VALVE LOCKS: VL-32
charliemccraney
Posted 3 Years Ago
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You get a lot for your money with the Summit carbs so I think either one will work for you.  The 500 should be adequate but it is best to err on the larger side with a vacuum secondary carb, so I think the 600 will be the best choice.  That gives you a little more room for future upgrades.

The most important thing, no matter which one you go with, is that you learn to tune it.  Despite their claims, there is no such thing as a ready-to-run carburetor right out of the box.  They all require tuning.



Lawrenceville, GA
ianmatt
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Awesome I was thinking the same thing. Now I need to dial in what jets will work best for 5000 feet above sea level for my set up. From what I have heard this engine likes a bit more gas. Any experience or thoughts on jets for the elevation? The 600cfm comes with bigger jets than the 500 as well.
charliemccraney
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No idea.  Start with the out of the box tune and adjust from there.  There is nothing special about a Y as far as a/f ratio.  It doesn't like gas any more or less than any other engine.



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miker
Posted 3 Years Ago
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As to altitude-Ted posted something about that not long ago. If the tuning manual for the carb doesn't address that, pull up the Edelbrock manual for a 600 or so carb. They've got a chart or reference about that. It's a pretty standard chart, should get you started.

miker
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Kent, WA
Tucson, AZ
ianmatt
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Just got my summit carb. next day shipping is amazing. One thing I know I had to do with my set up when I was messing with an older holley carb last summer was change the power valve. I ended up seeming to have the best success with a 5.5 power valve. While I am in there I want to pick the right jets. Any suggestions? I know the stock jets for sea level are not going to be right for colorado. The stock jets are Primary Jet Size:67 and Secondary Jet Size:73. I might go down just a tad to start. Thoughts?


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