how do you like your stock chev 350 in power wise out on the trale (low RPMs)

I looked at some numbers and they seem to be a bit lacking in the tourqu department

350 does lack in the torque department... that's why most guys will throw a 400 crank in the sumbitch and call it a 383.:D

gear everything around it and add all th doo dads to make the 350 have more power and call it good! jimMy

I went from a heavy ass IH345 to a chev 355. I LOVE IT!!!!! With decent gears it is just fine, but I did add a few goodies to make it perform a bit better:D

With decent gears it is just fine

I have to agree with that. Even though I have a tall first gear (400 turbo) and a 2:1 case (205), the 6.72 gears are just about right. I don't have a problem slinging the mud out of the tires. It also depends on the weight of your truck too

Does this mean you've given up the 6.2 Diesel idea?

Originally posted by FYRMAN
350 does lack in the torque department... that's why most guys will throw a 400 crank in the sumbitch and call it a 383.:D

is it just that easy

drop the 350 cranck and install a 400 and youre done

but I guess you cant burn regular due to the hight compression

Originally posted by Grandpa Jeep
Does this mean you've given up the 6.2 Diesel idea?

well not quite

it seems most people put down the 6.2 for junk

Lacking torque huh? I dont think so. Mine has enough torque to rip the rear caliper brackets off the rear housing, at the same time. I wont put the brakes on again at 160:1, without some beefy brackets.

Originally posted by Chief Yelling Alot
how do you like your stock chev 350 in power wise out on the trale (low RPMs)

I looked at some numbers and they seem to be a bit lacking in the tourqu department

What years are you looking at? sbc 350 have been (oem)produced in power ratings of over 400hp and all the way down to 150hp. Just depends on year and application. I love my 330hp super dependable motor. It will pull any grade in 4th gear and idle over anything. (great hp and torque) Now my "temporary" 160hp 350 I have now sucks! (minimal hp and nearly no torque.) A few more tweaks and the good motor will be back in!

what ya do to get the 330 HP and have it idel over anything

like if ya go for HP dont ya lose low rpm tourqu

Originally posted by Chief Yelling Alot
what ya do to get the 330 HP and have it idel over anything

like if ya go for HP dont ya lose low rpm tourqu

I've been trying to figure that out myself. I'm running a 355 W dart heads,TPI,Comp Cams Extreme energy262H-10,etc....

My problem is getting the thing to idle below 900rpm without wanting to stall everytime I come up against something. If it doesnt stall the idle air motor bumps it to 1200 and off she goes. This may be the Computer for my TPI but it seems like there is just NO TORQUE. My next plan is yank the cam and start over. But what can you use to get it to idle at 300rpm and still make power at 5000?
Dave (I do like the upper power though)

Originally posted by 350Samurai


I have to agree with that. Even though I have a tall first gear (400 turbo) and a 2:1 case (205), the 6.72 gears are just about right. I don't have a problem slinging the mud out of the tires. It also depends on the weight of your truck too

hey 350sami....is your name Tim by chance?

Originally posted by Keith
Lacking torque huh? I dont think so. Mine has enough torque to rip the rear caliper brackets off the rear housing, at the same time. I wont put the brakes on again at 160:1, without some beefy brackets.

I've got to agree with Keith here, I have plenty of torque.

But then again, we have damn near twin 355 TBIs (same cam).

Originally posted by Chief Yelling Alot
what ya do to get the 330 HP and have it idel over anything

like if ya go for HP dont ya lose low rpm tourqu my 330-350 hp 350 will bog down to as low as 300rpms to crawl over stuff if it needs too. im only at 75-1 too. beats me why it does it but sure is nice, i knwo its got an rv cam and shaved corvet heads. jimMy

My Ramjet 350 makes 400 lbs/ft. of torque. I pulled a wheelie coming up a middling-steep approach onto the highway a few weeks ago by accident. :D

Hey TJTRUBL you should check into the 4X4 extreme cams, I was running a similar cam to what yours is now and lacked badly in the torque. When I put one of those cams in it mad a NIGHT and DAY difference.
I finally gave up on the SBC's and went to a TBI 454 with domed pistons/ 4x4 extreme cam/ balanced/ crap loads of head work. If you want torgue thats were it's at. This thing will completely smolder 44's with out even tying to hard.

The cam I'm running on the 355 TBI is Comp's 12-388-4.

Specs are 206/212, 425/440

Part Number 12-388-4
Engine 1955-present Chevrolet
262ci-400ci
8cyl.
Grind Number CS 252AH-12 (V-8 T.P.I.)
Description

--------------------------------------------------------------------------------

Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.425 0.44
Duration At 0.006
Tappet Lift 252 260

--------------------------------------------------------------------------------

Valve Timing At 0.006
Open Close
Intake 18 54
Exhaust 66 14

--------------------------------------------------------------------------------

These Specs Are For The Cam Installed At 108 Intake CL
Intake Exhaust
Duration At 0.05 206 212
Lobe Lift 0.2835 0.2933
Lobe Separation 112

--------------------------------------------------------------------------------

Recommended Valve Springs 981-16

Originally posted by Chief Yelling Alot
what ya do to get the 330 HP and have it idel over anything

like if ya go for HP dont ya lose low rpm tourqu

I don't know, I didn't build it. I was just there for for the dyno run and to pick it up. Like stated above it will idle down to just about 300rpm- it's got grunt.

Originally posted by Charly


I've got to agree with Keith here, I have plenty of torque.

But then again, we have damn near twin 355 TBIs (same cam).

Hey Charly, got the motor up and running! Are you happy with the results?

Originally posted by Chief Yelling Alot
what ya do to get the 330 HP and have it idel over anything

like if ya go for HP dont ya lose low rpm tourqu

Trying to get high end HP and brute low end torque from a small block is not the easiest thing to set up. To build HP at the 5000, it will need to have good flow, which will rob the lower end torque. Compression and stroke length help a bunch with the torque, but putting in a larger cam with a huge overlap will depreciate the dynamic compression. You end up loosing the bottom end torque. If you want good low end torque, then a stock cam delivers the best, small valves and runners, a decent compression ratio, or a cam with a good amount of lift without all the overlap. Overlap is a combination of the duration and the lobe centers. Smaller durations with wide lobe separations make smaller overlaps. Without getting to technical, your motor has a static, and dynamic CR (compression ratio). Static is a measurement of the volume in the cylinder that is compressed, just by viture of the size of the avail space. That CR never changes. Then you add a cam. All cams have some over, or they would not make hardly any power at all. The overlap of the valves occurs at the end of the exhaust stroke, and the beggining of the intake stroke, so both the intake and exhaust valves are open at the same time. This is needed to scavange the exhaust gases from the cylinder, and also causes the intake gases to flow into the cylinder better. High rmp cams have big durations and overlaps to get fuel in better while the motor is whizzing away. Unburnt gas will be sucked out the exhaust port, just a by product of wanted to make power at big rpm's. So long gas mileage! But, because the intake valve hangs open longer due to the longer duration, the cylinder can not build as much compression, robbing the torque. The valve actually stays open for part of the compression stroke, so the sooner it closes, the more time the piston has to squeeze the mixture. Hope I explained all that correctly, sometimes I confuse myself.
I think you guys are trying to hard to make a 1/4 mile machine, and still have it be a rock crawler. With the right gearing and a fresh, basically stock 350, you will have all the power you need and then some.......:smokin:

As for TJTURBL, TPI motors with stock proms, dont like cams with less than 112* of lobe separation and big overlaps. Drives the MAP sensor crazy.

Keith,

The engine is in and works wonderfully. I have no torque complaints.

The ECM I have came from a 4.3 (idiots, I asked for one from a 5.7 manual tranny), my friend had a 5.7 auto chip at his place so I've been running that with the 4500. What I'm not sure about is if the memcal is any different betwen sixes and eights..

Unfortunately I had the pistons in when I realized the endplay on the crank was excessive (I had miked all the journals and they were perfect, didn't check the endplay until too late) so out came the crank, and pistons.....had to get a reground one.

Let's see, everything else went smoothly, except the freakin' freeze plugs, broke the motor/cam in, and noticed 4 out of the six plugs were leaking (yes, the two on the backside were).....so out came the engine, put new plugs in, with some aircraft sealant, and ran it again........same thing. DAMN!

Figured it out........I used the Howe recommended 22 lb. cap, and it was blowing the plugs and the water pump rear gasket. Switched to a regular 16 lb cap and put some sealant in the system, and it cols perfectly, no leaks. The Howe radiator is nice. Very well built. I am still taking suggestions on how to torture that cap though.

Use the Painless harness and VSS, works fine.

Overall, definitely worth the effort. I am very happy with the engine.

Thanks for the help.

Charly

Ya know Charly, you can and drill and tap for a small screw at each plug. Just at an angle at two spots along the edge of each plug, so the head of the screws catch the edge of the plug to keep it from popping out. Racers do it so they wont have fluld spills and wipe out.:eek:

Did you get oversized bearings with the reground crank? And what did you end up doing with the oil pump spring?

Figured it out........I used the Howe recommended 22 lb. cap, and it was blowing the plugs and the water pump rear gasket. Switched to a regular 16 lb cap and put some sealant in the system, and it cols perfectly, no leaks. The Howe radiator is nice. Very well built. I am still taking suggestions on how to torture that cap though.

If I remember right they recommend a 22 psi cap for the circle track application.

Originally posted by Aggro


If I remember right they recommend a 22 psi cap for the circle track application.

you mean the track from the bottom of the sluice, to the out, up the slab, back around to toyota out, then back in again?

Originally posted by Keith


As for TJTURBL, TPI motors with stock proms, dont like cams with less than 112* of lobe separation and big overlaps. Drives the MAP sensor crazy.

Yea, I heard that so I went with Mass air system. I also see what your saying about overlap,compression,small valves etc.... Really the only reason I'm running the Dart heads (W/$500 worth of porting etc...) is because the motor is out of a drag car project I never finished. One of them deals where you have too many toys, not enough time or $. So hears what I'm running currently:

355, 10.2 to 1 compression, Darts's with 210cc runners (I know-stupid for this), 1.5 roler rockers, TPI w/ported runners and mass air with stock computer, Very ported Ram horn Manifolds, 262H Extreme energy W/110 Lobe seperation and 218/224 lift at .050!

This is in front of a SM465/205 and D60's front and rear in my TJ. I really like the way this setup works everywhere except when I want to crawl. I almost have to load up the motor with the brakes and then it will crawl all day at about 800 + rpm. The plan at this time is a cam change but I hope with a smaller cam I dont get into too much cyl. pressure because of the compression ratio. Any other tips are greatly appreciated.
Thanks,
Dave (Most guys around here dont know what torque is)

Originally posted by Aggro


If I remember right they recommend a 22 psi cap for the circle track application.

Yeah, nothing that specified any particular use, only said to use that cap.

Oh, and I ended up running the 'stock' spring in the oil pump, like you had mentioned. And yesm, the reground crank came with some King bearings for it. Wish I had known about the crank before I bought the other shiit, would have tried to get one fo the packages. Oh well.

Originally posted by Keith


I think you guys are trying to hard to make a 1/4 mile machine, and still have it be a rock crawler. With the right gearing and a fresh, basically stock 350, you will have all the power you need and then some.......:smokin:



that what I was talking about

ive seen so many people put in huge cams and then complane about no low end tourqu when there on the trale :rolleyes: :shaking: :shaking: like if ya knew what you were doing and knew anything about engins.

so I guess a stock 350 is the best for tourqu


I still wand to go diesel but there way to much $$$


thanks for the input