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427 FE R.P.M. Range
Looking to set a RPM rev. limiter . I was told 6000 RPM was max ? What do you think .:confused:
Peter |
I am not affiliated with these guys but they seem to keep it south of 5000rpm for the 427SO and 6000rpm for the 428.
http://www.proformanceunlimited.com/video.html Scroll down for the FE's.. |
Depends on how your engine is built, but 6000 is a good ball park range.
Normally you want the limiter to kick in around 200~300 RPM or so past the peak power point. |
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Steve |
427 questions
Hello all, newbie here. I just read this current post and had some questions about the 427's.
I have 2 427 blocks I need some help to identify. One is a none side oiler with screw in core plugs, 66 427 cast into the bell housing area, a casting # on the pass. side of C6AE-B (the B is questionable), a casting date of ?K21 and main caps with C3AE. The lifter galleries are not drilled. The second is a side oiler with screw in core plugs, 66 427 in the bell housing area, no casting # on the pass. side (ribs in the casting, 5 to the front, 6 to the back), casting date of ?M11 and the lifter galleries are drilled. I have 2 sets of heads that are C8AE-H castings. 2 C4AE 2 C7AE I collected this stuff in order to build a BB Cobra. I have now decided to go the FI SB route so I want to sell this stuff off. If I am in the wrong area, please direct me to the correct forum. I also have a set of DOVE-A 429 heads if anyone is interested. I am in Southern Ontario. While I am here, I wanted to go Factory Five with my kit, pros and cons anyone? Any help is greatly appreciated. Thanks in advance. Dave |
There is no one answer to that question.
The list of contributing factors could fill a page. Ask your engine builder to be sure. |
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The dyno is a good idea to see what you have. No sense in reving it to 6500 if power drops off at 5200. |
Yes, All good info & I would add, no sense in spinning the motor more then you need to. Yes, Dyno it & know your power & torque ranges & then gear appropriately to your application & use those gears.
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Not that it was recommended practice, but I saw 7000 rpm several times with the 427 top oiler in 3121.
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:) I have a 427 sideoiler that was blueprinted and balanced and the rev limiter was set for 7000 RPM's. Several years ago I missed a shift and bent 2 pushrods and broke a rocker arm. I did not know where to go for the rockerarm or pushrods so I called Dove Engineering and they were able to get an exact replacement rockerarm and a spare. Also; new pushrods. The person I spoke to said I should set the REV limiter for 6000 RPM's. 7000 is too high.
I use 6000 RPM's now. Why take a chance! |
First of all a stock stroke on a 428 is 3.98" and in a 427 it is 3.78". All things being equal a 427 should rev a little higher than a 428. The biggest problem with original 427 was the factory rod bolts, ARP has fixed that. The lifter problem is the next to overcome. I once twisted a 406 up to 8400 RPM. That turned out to be an oiling problem. A sideoiler should not have the same problem. I was and am currently using shell solid lifters ,tubular pushrods. I'm using the Dove rocker system. The weight of the valves were once a big chalenge. I remember the use of hollow sodium filled valves to get the weight down and get dissapate heat. I remember a movie "REDLINE 7,000" I don't realy race my car and have the adjustable rev limitter set to 6,000 rpm. It gets to that rev limit in no time at all, usually surprising me. If I leave the rev limiter set at 6,000 rpm and the oil is warmed up I should be OK.
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My bored and balanced 428 SCJ on the dyno peaked in power at 6300 RPM. I set the rev limiter at 6K as I am not going to be racing a 40 year old motor and the car is all original except the engine work. Very seldom wind it above 5500 when I have it out to blow it out as it sets in the garage 99% of the time.
Ron |
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