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Old 03-09-2010, 09:12 PM
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RPM to Low in gear

i have a chevy lg4 305 with 270 magnum cam performer intake headers and 600 edelbrock carb stock stall in turbo 350 if i idle around 1000rpm and put it in gear it will drop to around 500rpm and act like its about to die the only way the rpm will be around 650 in gear is if i bring the rpm in park to about 1300rpm

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Old 03-09-2010, 09:49 PM
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with a 305 and the magnum 270 cam you are going to need a higher stall converter. comp says you can run it with a stock convertor but they are rating it for a 350 chevy. i would step up to at least a 2500 rpm stall.
the car will be a little quicker off the line too.
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Old 03-09-2010, 09:54 PM
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270 Magnum is a pretty big cam in a little 305, you need a higher stall 2500 stall converter.

I bet it could use more initial advance too, in the 18-22 initial area, but you will have to mess with the mechanical advance in the distributor and limit the amount of advance added by the mechanism so that the total advance doesn't get above 36-38. It will idle a lot better with this mod.

Get rhe timing figured out first, then see it it still would need a looser converter.
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Old 03-10-2010, 05:53 AM
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Ditto to what Eric is saying, it WILL need more initial timing, and limited total timing. It will probably still need a looser converter, but it will definitely run better.
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Old 03-10-2010, 05:23 PM
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thanks alot i set the initial at 20 and drives good
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Old 03-11-2010, 01:50 AM
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Just make sure you don't have the total timing above 36-38 now, it will lead to bad things(detonation) at higher rpm if it is. Virtually all distributors will need to be hand modifiied to meet this, only a few are adjustable enough as delivered.
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Old 03-11-2010, 02:21 PM
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the total timing is like 32
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