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Old 07-29-2013, 10:33 PM
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Shifting points?

I was wondering what the average rpms people would shift a 1984 chevy c20 BBC 454, it is stock and compression on all 8 are about 170 even so it is healthy, so what should i shift at when just driving it around, and whats the max rpm range it should ever see so i know what to set my new tach at since it doesnt have one. Thanks

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Old 07-29-2013, 11:15 PM
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max shift point for the stock 454 230 HP is around 4400 RPM. when normal driving shift at 1800 to 2000 RPM
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Old 07-29-2013, 11:59 PM
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Ok so is there any way to raise the max shifting point, with a good intake like a edelbrock performer, or does the intake not make much of a difference with the motors rpm range.
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Old 07-30-2013, 12:12 AM
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Any improvements made to the breathing of an engine will allow higher shift points,including intake and exhaust.
The 454 is a big engine and the factory did not give the engine very good heads or cam.The heads and cam timing will make the biggest difference to the shift points,"but",all the parts need to match for the best power. Im sure you could raise the peak power to 5,000 RPM if you added better breathing and a slightly better cam(roller would be the best choice),just make sure not to drop DCR too low.
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Old 07-30-2013, 01:36 AM
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Well from the factory it had a RV cam, which idk if they all did or what but i know they are for towing and low rpm, so did all 454's in 80s trucks have an rv cam or ???

Also my carbs secondaires dont work or arent there i forget which but if i replace it with another one will it make a noticable difference in power then without the secondaires being there, thanks.
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Old 07-30-2013, 07:04 AM
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The term "rv" cam is slang.You need the valve timing and lobe centers and valve lift to determine what the cam is best suited to do well. The first time I saw the term "rv cam" used was in the 70s.The factory cams were put in late for emissions and lift was very low, the RV cams were slightly advanced and slightly more lift,not in any way a performance option,just made big slugs work a little better
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Old 08-06-2013, 11:36 PM
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Rev 'er till she blows.. where ever she lets go at.. stay below that..

JUST KIDDING

you just need to feel it out. 3rd gear works best for this... rev it until it feels like it just doesn't want to pull any more... and shift about 500 rpm below that point for all the gears.

I rarely make it above 3000 rpm with my 355 on street.. just no reason to take it past that unless I'm hoofin' it for some reason.

on the track, I take it right to the 6000 rpm rev limiter on every shift.
(I have an MSD 6AL with a 6000 rpm rev limiter pill in it)

after I had a problem with my ratchet shifter.. and missed the 1-2 upshfit @ 6000 rpm.. and by the time I went 'oh ****' and got out of the throttle, I was pushing past 7000 rpm. my stock valve train REALLLY didn't like 7200 rpm.. I'm amazed the stock bottom end held together :>
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