440 build working with what I’ve got

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RustyRatRod said:
With that camshaft, you could run pump gas with close to 12:1.
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That makes things a lot easier! Would 90-93 premium be sufficient? I assume this has to do with the lift duration bleeding off some of the pressure and affecting the dynamic compression ratio vs the static?
 
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HotrodColt said:
That makes things a lot easier! Would 90-93 premium be sufficient? I assume this has to do with the lift duration bleeding off some of the pressure and affecting the dynamic compression ratio vs the static?
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I think it would run on 90 non ethanol. That .590- is a BIG cam.
 
I’ve got a 440 with 12.5 cr. and 915 heads that I have set up for e-85 , it made good power on the dyno, very drivable but not very fuel efficient. I believe the cam is mostly responsible for the mileage. I use a flat tappet similar to the 590 mopar cam.
 
RustyRatRod said:
I think it would run on 90 non ethanol. That .590- is a BIG cam.
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The cam is a large cam for the street but remember the iron heads, pump gas might allow for lumping around town, but when the RPMs go up with a pull detonation happens as early as the torque comes in and it hits the converter.
 
RustyRatRod said:
I don't think there's a ghost of a chance in hell you'll need E85 with that .590 cam. I think pump premium or even 90 ethanol free will be fine. Just my opinion.
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You do realize that you also get a boost in torque and hp from e 85 plus overall lower engine temperatures.
 
HotrodColt said:
UPDATE!!!!
I finally found a matching piston for my domed set by chance when I traded some truck grills for a box of big block parts. So now I have a full set of pistons. Also traded a few things and now have a tunnel ram with dual 750 dp holleys, my 906 heads cleaned up really nice and are ported with larger valves installed. Acquired a 4000 stall converter, still planning on running the .590 cam and converting the carbs to e85.
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When you write update like that, it makes me think I'm watching unsolved mysteries lol
 
Another update for those that are following along or have a similar build they are working on! I have FINALLY started to assemble this engine. I have changed which block I’m using, instead of a 0.060 over I’m using a 0.030 over, I was able to trade my way to a set of good trw dome pistons for it, special thanks to KillerSlant. Still working on cleaning up the heads I have, which are 906’s that have been ported and 2.14” stainless intakes installed and matching springs for the .590 cam. M1 tunnel ram with dual Holley 750DP mechanical secondaries. My current issues are the cam timing and finding the correct valve stem seals to use. The old seals I took off look like just o-rings and the umbrella style seals are too big for the springs. Any help figuring out where or what type of seals to look for would be appreciated! When it comes to cam timing I have been told that the .590 purple cam likes to be installed at 4* advanced, my timing set has 3 notches for my crank which are straight up, 4 degrees advanced and 4 degrees retarded, but I know that the crank gear only changes the cam timing by half of that. So should I just stick with the 4 degrees advance at the crank or does the cam have the advance needed already ground into it??
 
HotrodColt said:
Another update for those that are following along or have a similar build they are working on! I have FINALLY started to assemble this engine. I have changed which block I’m using, instead of a 0.060 over I’m using a 0.030 over, I was able to trade my way to a set of good trw dome pistons for it, special thanks to KillerSlant. Still working on cleaning up the heads I have, which are 906’s that have been ported and 2.14” stainless intakes installed and matching springs for the .590 cam. M1 tunnel ram with dual Holley 750DP mechanical secondaries. My current issues are the cam timing and finding the correct valve stem seals to use. The old seals I took off look like just o-rings and the umbrella style seals are too big for the springs. Any help figuring out where or what type of seals to look for would be appreciated! When it comes to cam timing I have been told that the .590 purple cam likes to be installed at 4* advanced, my timing set has 3 notches for my crank which are straight up, 4 degrees advanced and 4 degrees retarded, but I know that the crank gear only changes the cam timing by half of that. So should I just stick with the 4 degrees advance at the crank or does the cam have the advance needed already ground into it??
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Degree the cam.

Dont trust the marks
 
Def degree the cam.

Stock heads that have unmolested valve guide bosses will need to have them cut for smaller diameter seals, along with having them shortened for adequate retainer to seal clearance.
A correct spring for the 590 cam will be a dual spring of some kind, which means the spring seat area on the heads will need to be machined for them(if it hasn’t been done already).
 
PRH said:
Def degree the cam.

Stock heads that have unmolested valve guide bosses will need to have them cut for smaller diameter seals, along with having them shortened for adequate retainer to seal clearance.
A correct spring for the 590 cam will be a dual spring of some kind, which means the spring seat area on the heads will need to be machined for them(if it hasn’t been done already).
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I was able to get a set of heads that have already been run with this cam, proper springs, cut spring seats already to go but I want to install new seals before bolting them on
 
If the guides haven’t been cut for smaller seals, thats probably why there were o-rings on the heads.

The two common sizes the guides get machined to for good seals are .500” and .530”.
 
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PRH said:
If the guides haven’t been cut for smaller seals, thats probably why there were o-rings on the heads.

The two common sizes the guides get machined to for good seals are .500” and .530”.
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I’m sticking with Viton o-rings for now, with the springs I’m using there is 0 room for any other style of valve seal.
 
Interesting ……….. but the OD of a stock guide boss on a stock BBM head is a nominal .625”.

With the guides remachined for upgraded seals, there are seals with an OD of less than .625”, so they’d actually have more room than a stock guide boss and no seal.

You’d rather not mess with it…….. that’s fine too.
 
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