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Old 03-03-2013, 09:28 AM
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stock 400 cam upgrade

hey guy's this is my first 400 small block .I bought this 77 chevy 4x4 short box and i came with a stock 400 and the guy gave me a extreme energy cam with it the cam is a 268/268 part number cl 12-210-2 would this work well with this stock 400? Any help would be awesome . thanks

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Old 03-03-2013, 09:56 AM
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by itself you will lose usable power in a big truck.
Cam by itself is not a good item to change,usually
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Old 03-03-2013, 01:18 PM
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thank you i just took the motor apart and it has 882 heads. headers/750 holly carb ,and flat top pistons are these heads worth port and polishing them? or should i get a set of vortec heads i guess the motor must not be stock after all.
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Old 03-03-2013, 03:31 PM
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The 268H cam is a great upgtrade for your truck 400.
add new hyd lifters. Add comp cams 981-16 or Isky 205D valve springs for max perf.

The heads are the worst of the worst and a waste of time on a high perf engine.
And they are not really worth porting, especially if you have to pay for that.
start with a better head.


Get some hi perf heads with a high perf combustion chamber and high flow ports.

With the cam+ heads + headers you will really wake up that 400.

Any head with a 64ish chamber is a big step up from the 882's
including vortecs. There are tons to choose from.
BRODIX Cylinder Heads Over 40 Years of Innovative Cylinder Head Technology
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Old 03-03-2013, 04:19 PM
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whoops of your 400 does actually have a flat top piston then look for a 70+cc chamber head.

match a 64cc head up with a dished piston for pump gas on a 400.

a 64cc head and a 400 flat top piston will get the compression ratio a bit too high for practical pump gas use
on your 400.
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