I HAVE A STOCK 390, 40 OVER WITH A NEWLY REGROUND CRANK, NEW RINGS, STOCK OLD HEADS, 1 3/4" HEADERS, PERFORMER INTAKE AND 600 THUNDER CARB. A 4 " K&N FILTER STOCK CAM. AND A 4 SPEED
I NEED MORE JUICE!!!! :cool:
iF i INSTALL ELDELBROCK RPM HEAD AND INSTALL A NEW TORKY CAM, WHAT DO YOU THINK IT WILL GET ME FOR MORE POWER??? WHAT KIND OF CAM SHOULD I SPEC OUT?????

 

PLEASE DONT CAPITALIZE EVERY LETTER IT IS VERY ANNOYING AND ON THE INTERNET IT MEANS YOU'RE SHOUTING!!!

Now that we've got that over with...

The Edelbrock heads will definately get you more power. For the cam, we need to know more about what you want to do with it. High rpm racing, stump puller, what? How much money do you have to spend? Could you afford, say, a roller cam and rollerized valve train, or are we looking at a hydraulic flat tappet?

Also the intake and carb seem small. For what you have now it should work ok, but with the new heads and a different cam you'll want the RPM intake and a 750 vacuum secondary.

 

Yes, and feel free to sell me your old performer intake

 

RPM manifold to go with the RPM heads and something like the Crane 901 or 941 cam should be good, but Rusty70 has the DD...

--Mike

 

I was trying to get more power to pull my 5th wheel. I was pulling a 8000 pound quad trailer and it was tough going up some hills, down into 3rd gear. I need more torque as when I hook on my 31 foot fifth it might be even worse. I have 4.10 gears and like I said a 4 speed. Roller cam is a bit pricey but I am open to any ideas. I don't know how much more power you will get between the two, rooler or hydralic? If I got the heads and a good cam, I was hoping that would give it some needed boost.
Is the crane 901 or 941 good for torque?

Sorry I didn't mean to yell! HAHAHAHAHAHHAA. Thanks!

 

Ok, heres what I think would be the best way to do it:

1. Edelbrock Performer RPM intake
2. Holley 600cfm vacuum secondary
3. Edelbrock Performer RPM heads, get the 76cc heads to lower compression a little.
4. TRW L2291 forged pistons. They have the right compression height to get the right compression ratio. The Silvolites have a 1.76" compression height, whereas these have 1.776". It does make a difference. Also, they'll hold up better under towing conditions with the higher performance components.
5. Adjustable valvetrain from DSC. If you can find the components at Napa for less do that. You need new rocker shafts, rockers, and pushrods. The rockers are adjustable, to allow you to accurately set the lifter preload with the different cam.
6. Crane 343941 cam.
7. Headers, dual exhaust. This is a must. Stock FE manifolds are the worst design ever IMO.

With the above components, you should get 9.6 to 1 compression. My DD2k program is saying you'll get 390hp @ 5500rpm, and peak torque of 433ft-lbs @ 4000rpm. The torque at 2000rpm is 402ft-lbs, which is still a great improvement over stock.

You mentioned going with a roller cam. I think this is a bad idea for towing. The crane 521 roller cam is a little too radical for towing IMO. You certainly would get more power up high though. The drawback, other than moving the power up too high, is that you'd have to spend more money beefing up the valvetrain.

 

Is that the same Crane roller cam that HOTROD used in their 390 build or is it a bigger one?

 

I really dont know. Its been a while since I read that Hot Rod article, and I dont think they said what it was.

 

the 521 is the same one HOTROD used. Their engine would have probably been pretty adequate for towing, but then again they had Edelbrock heads. If I remember right, the thing had 400 ft. lbs. at the lowest point.

 

Hrm. I ran another simulation in DD2k. From this it looks like the 521 would probably work for highway towing, with a little loss in low end. High end power is unquestionably better though.

Keep in mind though that the roller cam costs more, roller lifters cost more, custom pushrods cost money, cast iron stands cost more money, end stands, HD shafts, aftermarket stem seals, machining required for those (possibly not required with edelbrock heads, dunno)... I could see the roller cam easily adding $1000 to the cost of your build, to do it right.

 

Rusty, can you let me know how much torque the motor it is making with the 941 cam at 3000 and 3200 rpm? It is where the trucks likes to run most of the time on the highway. considering the combo you worked up for me. Thanks again for the help!

 

Sure. Its 419ft-lbs @ 3000rpm, and 430ft-lbs @ 3500rpm. My program only reads out every 500rpm so I cant get you numbers at 3200rpm. Somewhere in between I'm sure.

 

The new rooster ford will be good to go with this combo, thanks again for all the info! I will update my pic's once it get the new parts on. have a look before if you want and let me know what you think.