Re: IML: 440 compression??

[sosmi@xxxxxxxxxxx]

It sounds like you have a healthy engine, but as far as raising compression, I think you can get the performance improvements, without messing with the engine too much.I'm not sure if you have a"LEAN-BURN" motor, but if you do, that goes first. Next a dual exhaust system, I had a78 NYB, I used 69 440 RoadRunner mufflers with 21/4 inch tail pipes.Then a little carb mods.We went 1 step further, and changed the rear axle ratio to 3.55 .It wasn't a rocket-ship,but it sure ran good, and could still get 13-15 mpg.Raising the compression on your engine won't help much, unless you change the cam, carb, and do the above. Don't forget what your driving.Ya'll have a nice day, Dave.

-------------- Original message --------------
From: "Andrew A." <canafornia@xxxxxxxxxxxx>

great thanks!..I figured it was about normal as all cylinders are within 5PSI of each other and the motor runs smooth as silk but I just figured I would check with those "in the know".....What needs to be done to raise the compresion to the level of the high perf. 440's?..is it just the heads that are different or are the pistons also different from my 1975  as compared to the late 60's 440's?....Also how much more power should that give me?...

----- Original Message -----

From: DR CHALLENGER

To: mailing-list@xxxxxxxxxxxxxxxx

Sent: Tuesday, November 28, 2006 12:14 AM

Subject: Re: IML: 440 compression??

compession ratio was rated a 8.2 to 1, but its more like 7.7 or so. 125 PSI
sounds normal.
.


>From: "Andrew A." <canafornia@xxxxxxxxxxxx>
>>Just wondering if anyone knows off hand what the normal good cylinder
>>compression PSI is for a 1975 440?...Usually I'm used to V8's being in the
>>145-160 range, but all my cylinders in my 1975 440 are between 122-128..I
>>understand that these are low compression engines but have no idea what is
>>considered "low compression"...Is that normal for these engines?
>




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