carb jets - Team Camaro Tech
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post #1 of 6 (permalink) Old Nov 9th, 02, 03:46 PM Thread Starter
 
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i have a recond 327 in my 1968 RS. im running a 300 hp cam, with a 600 holley sitting on top i need to know what size jets to run in it. thanks for any help
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post #2 of 6 (permalink) Old Nov 10th, 02, 01:29 AM
 
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grahm, there are alot of things to consider when jetting a carb for maximum hp. The air quality will determine how much jet the combination will allow before the MPH starts to fall off. A wild quess would be 2 or 3 sizes above (richer) factory.
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post #3 of 6 (permalink) Old Nov 10th, 02, 09:11 AM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by graham pilkinton:
i have a recond 327 in my 1968 RS. im running a 300 hp cam, with a 600 holley sitting on top i need to know what size jets to run in it. thanks for any help<HR></BLOCKQUOTE>
i see what you are saying but i realy need to know where to start and with what jetting

***Edited to fix broken quote***

[This message has been edited by DjD (edited 11-10-2002).]
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post #4 of 6 (permalink) Old Nov 10th, 02, 09:33 AM
DjD
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Graham - Get a good Holley carb book, do some research, and set your carb back to factory spec's. These links will help too...
http://www.holley.com/HiOctn/ProdLin...FMSC/FMSC.html
http://www.holley.com/HiOctn/TechSer...o/Trblsht.html
http://www.holley.com/HiOctn/TechSer...o/FMCTech.html
http://www.holley.com/HiOctn/ProdLine/CarbList.pdf

With the carb at factory spec's, you have a good base to start from. Learn about each circuit that the carb is comprised of and know if your carb is over or under sized for your engine. From there make some baseline test runs, read your plugs and decide if you are too rich or too lean and adjust accordingly... Don't go more than 2 jet sizes up or down at a time and test and verify the change before going further...

There just isn't a way anyone can say run 68 primary and 76 secondary jetting and you'll be good to go!! Even someone with years of tuning experience would need to know everything from plug heat range, compression, cam spec's intake type, exhaust header size, mufflers, pipe size and alot more detailed info to make an educated guess for you...

------------------
...Dennis
"The '69, the '96 our local club"
and the "daily driver"
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post #5 of 6 (permalink) Old Nov 10th, 02, 12:25 PM
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MY guess, since no one really gave you an approximation, would be 67-68 primary and 74-76 secondary. This should get you in the ballpark, you should go and buy a few sets of cheap plugs (autolites) and test and tune from there. You also might want to pick up a heat range or two different after your initial set with its adjustment.
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post #6 of 6 (permalink) Old Nov 10th, 02, 11:33 PM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by graham pilkinton:
i have a recond 327 in my 1968 RS. im running a 300 hp cam, with a 600 holley sitting on top i need to know what size jets to run in it. thanks for any help<HR></BLOCKQUOTE>

thanks for help,started with 73`s too much juice, went to 64`s seem to be just right so far but i will keep a close eye on them. thanks to everyone graham
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