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Old 05-05-2012, 01:41:25 PM   #16
K5JMP
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a 75 jet is a good place to start... be careful of timing in case thats lean..
I would measure vacum at idle, then divide by 2 and subtract 1 for power valve

(measured vac/2)-1= ballpark
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Old 05-05-2012, 01:51:54 PM   #17
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Quote:
Originally Posted by K5JMP
a 75 jet is a good place to start... be careful of timing in case thats lean..
I would measure vacum at idle, then divide by 2 and subtract 1 for power valve

(measured vac/2)-1= ballpark

Thanks again, Off to Summit racing I go...lol It is nice having a summit here in town.
Bill
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Old 05-05-2012, 01:52:39 PM   #18
K5JMP
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check this thread.. some cars with a big cam will break that rule..
http://www.nastyz28.com/forum/showthread.php?t=240351
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Old 05-05-2012, 04:05:24 PM   #19
theflash
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Quote:
Originally Posted by Mr.Bill
OK, Update.. The jets are 80, The 0 is just hard to see, The power valves are 6.5, My son says with the big cam I have and low vac I should try 4.5 power valves and maybe a 75 jet.
The cam is a comp 598/598 heads are Merlin rec ports.
Input?
Thanks again.
Bill

A rule of thumb is to have the PV 2 lower than the vacuum your pulling at idle. Have you put a vacuum gauge on it? What is a comp 598/598 cam? What kind of motor is this? Maybe an 850 is just too big?
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Old 05-05-2012, 08:17:41 PM   #20
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Quote:
Originally Posted by theflash
A rule of thumb is to have the PV 2 lower than the vacuum your pulling at idle. Have you put a vacuum gauge on it? What is a comp 598/598 cam? What kind of motor is this? Maybe an 850 is just too big?
Update: Car is running great, I removed the 80 jets and installed 74p/76s and changed the pv from a 6.5 to a 4.5, I am also having a air filter issue, The filter I can fit under the hood is not letting enough air to the carb, Not sure what I am going to do about this...lol
The motor is a 468 BBC with Merlin rec port heads, Not sure on the compression yet. It has headers and a big cam.
Just got the car last week and I have a lot of cleaning up to do
Thanks for everything guys.
Bill



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Old 05-06-2012, 08:38:44 PM   #21
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I totally dig that green! Nice car, glad it's running better.
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