Which cam for mud truck?

[1982PrairiePounder]

Building a 327 which will be a 331 after its bored and Im stumped on which cam I wanna run. The motor is gonna run in the 450-500HP range so I need a big cam. I've sorta narrowed it down to two Comp cams one is the 292H Magnum with a .501 I&E lift and the other is the XE284H Xtreme Energy with a .507 Intake lift and .510 exhaust lift. What works best in a hardcore mud bog truck? Help me decide!!. Thanks.

[brewchief]

Originally Posted by 1982PrairiePounder

Building a 327 which will be a 331 after its bored and Im stumped on which cam I wanna run. The motor is gonna run in the 450-500HP range so I need a big cam. I've sorta narrowed it down to two Comp cams one is the 292H Magnum with a .501 I&E lift and the other is the XE284H Xtreme Energy with a .507 Intake lift and .510 exhaust lift. What works best in a hardcore mud bog truck? Help me decide!!. Thanks.

You're building a 450-500hp small block using an off the self hydraulic cam?
What heads, intake, carb , etc?
Whats the expected rpm range?

[mustange70]

i hope you're ready to get beatin up over this, cause you're way way out to lunch with your specs, and what your using it for, example:

450-500HP range so I need a big cam

this is true, espically out of stroker 302, and be prepared to spend some money if you want it live for any length of time.

292H Magnum with a .501 I&E lift and the other is the XE284H Xtreme Energy with a .507 Intake lift and .510 exhaust lift

those cam specs are barely gonna break 300-350hp with a really good set of heads. You need to be looking into the .600+ lift ranges minimum, and a good set of aftermarket heads to hit 450-500hp.

What works best in a hardcore mud bog truck

Not what you're wanting to build, mud takes tq, and lots of it. You should be starting with a at least a 351w aand stroke that out to 400+ cubes, or hell do like what i did and start with a 400 and go overboard with it , you are going to be disappointed with a 302 for a motor (in any shape or form) for a mud bogger.

[TEX]

Originally Posted by mustange70

this is true, espically out of stroker 302


You should be starting with a at least a 351w aand stroke that out to 400+ cubes, or hell do like what i did and start with a 400 and go overboard with it , you are going to be disappointed with a 302 for a motor (in any shape or form) for a mud bogger.

Umm, where did you get that he was building a stroked 302? Looks to me like he's going .030 over on a Chevy 327.

The rest I agree with

[montecarlo31]

skip that, LQ9 + Heads + Cam = 450 - 500 HP and a reliable setup. You could build a nice LQ9 w/ harness for 5 grand all day long in the 450-500+ HP range.

[mustange70]

Originally Posted by TEX

Umm, where did you get that he was building a stroked 302? Looks to me like he's going .030 over on a Chevy 327.

The rest I agree with

Meh i'm a ford guy and 331 is 302 stroker shit soooooooo

[HEAVY METAL]

if ur serious about a mud motor... forget the small block ...BBC

[hdblue]

okay if you figure 1.5hp per cubic inch thats 495, not as easy as to do as you think though. you do not need .600 lift. duraration and lsa is more important. pick a cam that will peak at about 7500 rpm. at least 300 degree duration cam. go with a 108 degree lsa and make it a solid. Also your gonna need about a 12 to 1 compresion ratio to work right with that cam. single plane intake and 750 cfm carb. 1 7/8 headers. If your tryin to race in a paticular class all of that changes, rules dictate your horspower.

[masonmachines]

That much power from that small an engine is going to cost a lot, and probably wont last long.

[Jrod-13]

Skip the 302 based motor.. not enough stroke..

A 408 works pretty, but really, if you go to any mud bog, you will see why everyone runs a 460, or 460 stroker.. it's all about cubes..

[1982PrairiePounder]

OK my motor is as follows so far. 1967 327 .030 over, forged steel crank, machined for splayed 4 bolt mains, forged aluminum pistons. The compression is 12.8:1 w/64cc head or 10.7 w/76cc. I was planning on running highly modifyed vortecs or save up for a set of cast iron 200cc world products heads. I'll have a 3000 stall converter and the diffs have 4.56 gears and I have 38s. Oh and i have 750 holley feeding it. Hope this answers some questions

[Jrod-13]

oh... a SBC... well in that case, all you need is a RV cam, and chrome kit.. 500HP garanteed!! Don't forget to tell everyone it's out of a corvette! because every hillbilly mud truck has a corvette 350(or 327 in this case) :lol:

But serriously, If you want to hit that kind of numbers, neither of the heads your looking for are realy going to do it without a ton of work, spend the $$ for good aluminum heads. As was mentioned earlier, your cam specs are way, way small. If your serious about making the number, your going to probably be spinning near or above 7k with it. I'd also look into a bit looser of a convertor, with only a 3.25" stroke, and especialy with a 205 in there..

[Hillbilly Rockstar]

I hope its a really light weight truck, like feather light. I ran a 351w for about 4 years in mud bogs before I stepped up to something bigger. I'll never go back to a small block again. Anything you can do to a sb, can be done to a bb for way more power.
As for cam, screw the hyd. cams, you'll never get enough rpm outta them. Go solid or solid roller, you have to check the lash on a regular basis (I check mine after every weekend) but for a mud racer, thats a very minor thing to do. I ran hyd. cams till they started bending valves on the pistons. Then it was time to step up and get the real deal. I'll never use a hyd. cam for a race motor ever again!!

[TEX]

Originally Posted by 1982PrairiePounder

OK my motor is as follows so far. 1967 327 .030 over, forged steel crank, machined for splayed 4 bolt mains, forged aluminum pistons. The compression is 12.8:1 w/64cc head or 10.7 w/76cc. I was planning on running highly modifyed vortecs or save up for a set of cast iron 200cc world products heads. I'll have a 3000 stall converter and the diffs have 4.56 gears and I have 38s. Oh and i have 750 holley feeding it. Hope this answers some questions

I think you're gonna struggle with those 4.56's if you're running deep stuff. It's kind of an in-betweener gear for your setup IMO. You'll be geared WAY too low to run 1st, and too high to run 2nd.

[rock jeep]

Come on guys.... The guys that run the horseshoe races down here will tell you different YouTube - Double R mud track Sheridan arkansas 7-25-09 The first half of that vid is stock class till like 2min or something. Stock class rules state Hyd. cams ONLY, no strokers, no dome pistons, stock heads no porting, a ci limit of like 370 Which leaves you with a 350 or smaller in a Chevy. And they will jump my ass when I tell them they are not running by the rules. Watch the first few races in that class and tell me what you think

[TEX]

Originally Posted by rock jeep

no strokers

That's the gayest rule ever. They've already got a limit on the cubes, just leave it alone. As is, a guy could stick a 350 crank in a 327 block, which incidentally creates a ...........wait for it.........350. But, he'd be illegal since he "stroked" it

And I wonder how much of that other stuff they actually check.

[rock jeep]

Originally Posted by TEX

And I wonder how much of that other stuff they actually check.

Vacuum! Thats it! They dont even really look to see if the block has 3 freeze plug bosses. You have to pay to contest another driver But no one will do it because They know it will be them getting checked at the next race

[Brent Foster]

3000 stall wil not be enough look tward 5000 if this thing it going to see any racing, 4500 with any "good Solid lift cam. I ran a Comp in a 355

12-612-5 PN - Comp
Grind # 300b-6

I'd recomend
12-609-5
Grind # 285b-6

These are not roller, but it is what I used on a budget a few years back when I started pit racing a big chevy. I had a 4500 stall and it worked well. be sure to run a manual valve body in the tranny so you can take advatage of the revs off the line

[1982PrairiePounder]

I do have a solid roller Crower cam for this motor with about a .540 lift but I dont know if I wanna run it just yet. I gotta send it to crower to get I.D. As far as gearing go I can always stick with stock 4.10s I just wanted to run the stronger V6 3rds. I'm gonna check out that 285b-6.

[TEX]

Originally Posted by 1982PrairiePounder

I do have a solid roller Crower cam for this motor with about a .540 lift but I dont know if I wanna run it just yet. I gotta send it to crower to get I.D. As far as gearing go I can always stick with stock 4.10s I just wanted to run the stronger V6 3rds. I'm gonna check out that 285b-6.

This going in a Toyota? Use the Toy transfer case. It has a 2.28:1 low range. Combine that with 4.56's & you'll be gold. I've got 4.37's with the Toy case, a TH350, & a 408" SBC in my Toy. Originally had 38X12.50's, but I'm currently running Q78's up front & 35X10.50 Boggers in back. And it really likes 2nd low.

[1982PrairiePounder]

Originally Posted by TEX

This going in a Toyota? Use the Toy transfer case. It has a 2.28:1 low range. Combine that with 4.56's & you'll be gold. I've got 4.37's with the Toy case, a TH350, & a 408" SBC in my Toy. Originally had 38X12.50's, but I'm currently running Q78's up front & 35X10.50 Boggers in back. And it really likes 2nd low.

My truck has the 205 in it. The toyota t-case is long gone now. after the motor and trans are built i'll be working on the doublers.

[Buckshot33]

Originally Posted by rock jeep

a ci limit of like 370 Which leaves you with a 350 or smaller in a Chevy.

go build a 366 tall deck BBC out of a school bus with some good 702 closed chamber 427 heads and see where it takes you

[rock jeep]

Why would you do that when you go to a big block you have to step up to a LWB 3/4 or 1 ton and then the limit is 477ci??? That was not my point. My point is the guys in the vid swear they are running 355s with hyd. cams. Thanks for nit pickin though

[OKMudn]

You'll be fine with the 38's and 4.56's with a 205...exactly what i run in my truck. I would strongly encourage you to go with a lot looser stall.....something in the 4500-5000 range. Get that motor running on top from the start. Dont be afraid to go into the .600 range on cams and I wouldnt hesitate to try an 850 or 950 double pumper on it if you are savy with a holley. And with the 12.8:1 static compression you will be over the limits of a MSD 6AL. Make sure that you use an ignition that will sustain a spark under those conditions.

Hope this helps.

[Train Horn]

Originally Posted by HEAVY METAL

if ur serious about a mud motor... forget the small block ...BBC

Disagree !!!

Was at a race last night 2 SBC spanked all the Big blocks.( 1 being our SBC )
small block's are very snappy motors, if there built right !!

Good day