427 FE R.P.M. Range

[coinop101]

Looking to set a RPM rev. limiter . I was told 6000 RPM was max ? What do you think .

Peter

[1985 CCX]

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..

[Ronbo]

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.

[lovehamr]

Originally Posted by 1985 CCX

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..

That sounds bass ackwards. The 427 with it's shorter stroke and resultant lower piston speeds should stand much more RPM than the 428 with it's longer stroke.

Steve

[neighbourdave]

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

[Silverback51]

There is no one answer to that question.

The list of contributing factors could fill a page. Ask your engine builder to be sure.

[patrickt]

Originally Posted by Silverback51

There is no one answer to that question.

The list of contributing factors could fill a page. Ask your engine builder to be sure.

Yep, your lifters for starters. Try dynoing your engine and see where your power starts dropping off. It might be earlier than you think.

[Silverback51]

Originally Posted by patrickt

Yep, your lifters for starters. Try dynoing your engine and see where your power starts dropping off. It might be earlier than you think.

Yep, you can start with lifters and then there are the springs, retainers, the intake and exhaust system, the cam. And when it comes to the cam, how it was dialed in can make a difference.

The dyno is a good idea to see what you have. No sense in reving it to 6500 if power drops off at 5200.

[Fordzilla]

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.

[marcocsx3121]

Not that it was recommended practice, but I saw 7000 rpm several times with the 427 top oiler in 3121.

[BFBurk]

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!

[Michael C Henry]

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.

[Ron61]

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