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Old 07-27-2004, 08:31 PM
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Question Wondering about accelerating RPM's with High stall torque converter

Hi all,

I recently installed a 2400-2600 B&M Holeshot in my Camaro. I believe the stock 700R4 stalled at 1800 RPM. Is this change enough to notice? When slowly accelerating from a stop the motor revs pretty high and then engages the tranny. Is this normal?

I just replaced a tranny that was slipping with this one so I am a little weary.

Also does any one know the normal idle vacuum for a 76 400SBC?

Many thanks!!

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Old 07-28-2004, 01:01 PM
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Stock '76 sbc should get a good 18" of vacuum at idle.

2400-2600 stall requires at least a meidum duration cam (265 duration or more) and 3.23 or better rear gears, or it might rev up before catching. If your engine/rearend does not meet these requirements, you should get a lower stall, or up your cam and rear. This is still not for sure to be your problem, but if the trans is adjusted properly, it would be the next thing on my list.
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Old 07-28-2004, 02:49 PM
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Thanks!

I have a 272 duration cam and 3.23 gears. My engine vacuum at idle is 10-12, it fluctuates at 500RPM idle.

I was not sure how vacuum effects acceleration. It shifts very firm enough to scratch second.
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Old 07-28-2004, 03:02 PM
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You need to up the idle to 750 and vacuum will increase, providing better atomization from the carburator.
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