I'm building a 429 69' high comp dove head motor. If i want 500-600hp naturally aspirated what should i do since i'm under a budget. So far i made custom headers with 1 7/8 primarys and am running propane and a crossflow griffin corvette rad.

IMO making "600 hp n/a" and "on a budget" are two mutually exclusive terms.

It'd be easier if we knew a guesstimate of what youre budget was. First, 1 7/8 primaries won't really flow enough for a BB, especially a 500-600hp one. I'd recomend a min. of 2 1/8" equal length primaries. Also, what compression ratio is this? I'd put some ARP rod bolts in it, have the rotating assembly balanced, stuff some forged pistons into it, and gasket match all of your ports. The powerband you want will determine the cam and intake you choose.









Oh, and be prepared to break the rest of your running gear:smokin:

4000 is all i'de like to spend and my drive train is a t-19, 205, 1410 dshafts, Rockwells, and 42's and a 4link f&r so no drivetrain problems. 11:1 comp and a good thing i barley taped my headers together i'll get bigger primaries.

You ain't gonna have a reliable motor for that price for the amount of power you want, rule of thumb is that its 10bucks a hp to build a decently solid motor.

and about 5 bucks a horse power towards drivetrain. if you expect an axle to take 500 horses, you usually have to pay about 2500 bucks or more. i think your over your limit :D

and yet another good point, but the rocks should be able to hold, depends on the type of tire though, swampers are a hell of a lot easier on driveline parts than boggers are in the mud.

and yet another good point, but the rocks should be able to hold, depends on the type of tire though, swampers are a hell of a lot easier on driveline parts than boggers are in the mud.

amen. thats how my 150 HP 6 cylinder shattered my 9"...:D Yeah, the rocks should hold up. just check them all over before you run them... bearings, etc.

The rocks may hold to a built big block and 42s but I can tell ya that a stock 205 t-case will not. As proven by the grenaded one sitting in the corner of the shop. DOH!



But like I said, forged pistons, ARP bolts, balanced rotating assembly, roller rockers, 2 1/8 equal length headers, a cam and intake, and a hot ignition will get you respectable numbers. Do a little bit of reading and you'll find that you can easily gasket match your intake and exhaust ports at home with some patience and attention to detail. You might want to give thinner head gaskets a shot too. It'll bump your compression a little more and give you a better quench area. Just my .02

It is possible on that budget, it just depends on how much of the work you can do your self. I know my cousins motor is right around the 4K mark, and makes the power your talking about. 70' linclon 460, D0VE heads, extensivly ported, with cobra jet exhuast valves, and shaved some. flat top hyperutectic pistons, 12.8:1 compression. Forged H-beam rods. Custom grind clay smith cam with solid ilifters. Wieand stealth intake, 850 biggs carb, and duraspark II igntiion, set at 39.5* of timing. it will idle somewhat smooth, make 15" of vaccum at 1000rpm, and runs very, very strong. But Im not sure if I would concider it a wheeling friendly motor, with fuel milage, and the need for 114 octane fuel..
And FWIW, it's sister motor dynoed at 640/632.

So its possible to make that power, and its possible to make it at the budget, but you need to REALY choose you spending, and need to be able to everything yourself.. I'f you call up summit, and tell them "yes" you are probably going to end up with a blinged out, 300hp motor, for your 4 grand..

hmmm i may shoot for like 400 then bump it up later.

I don't think that 500 horse for 4K is to bad at all, if you already have the big block.

Add some aftermarket heads, the right cam, probably need dual propane mixers, bigger headers, steel crank, decent rods and fasteners, and if you put it together yourself I bet it can be done.

Shit, here are some dyno examples off the AFR website for a 302... but AFR doesn't do bigblock Ford heads.

http://www.airflowresearch.com/ford_dyno.php

If they make 455hp out of a 302 that is naturally aspirated, then I think it is absolutly doable to hit 500 out of a big block. Shit, most of them in the late 60's / early 70's were in the 385-400hp stock!

its not the 4k for the motor. its the 4k for the whole drivetrain.:shaking:

I thought he was saying he already had the rest of the drivetrain...


Shit, my bad. If your trying to do the entire drivetrain for 4K, yer fuked :flipoff2:

i already have a 750cfm propane carb and 3 models E's and some regulator's off of an 80's propane hauling truck, and that price was for motor only. I took the flanges back to the exhaust shop in exchange for 2 1/4 primary ones. Got and i got the block and heads out of an ltd and its stock bore:D for $300.

dang you lucky sob.

Be careful with you're valvetrain geometry with the motor depending on what you go with for valvetrain, as i know several people that have run into issues with improper length pushrods and what not.

I guess the biggest thing here is what type of wheeling is this motor going to be used for? As a motor built for muddin is a lot different then one for trail riding (ie high rpm hp and lots of midrange tq for a mud motor or stump pulling tq just off idle and mid range hp for trail riding) as the mud motor will need to be built to live at high rpms at extended periods of time.

i had a 347 stroker in this truck before and it was more high rpm like 4500-5500 since this truck is a rockcrawler i guess and i need to get my tires hot but i need some bottom end that why i went bb over a super or turbo charger.

A 429 is also a high RPM motor... they only have a 3.59" stroke...

If you want cheap power, you want a 460. Find a 460 crank...

go 514. 600hp is easy from there

if you are talking cubes, why not just go 532?:D

if you are talking cubes, why not just go 532?:D

Pft. Me? I would If I could get it to run right.

on summits website it doesn't show and 69' 429 cranks so could i use one for a 70's 460? What about other part interchanging?

on summits website it doesn't show and 69' 429 cranks so could i use one for a 70's 460? What about other part interchanging?

AFAIK the crank, rods, pistons etc will swap from a 460 to a 429 and visa versa

First off it is going to be hard to put up those numbers with propane. Don't get me wrong propane is good. We deal with it all day long on forklifts and equipment. The number one thing is HARD SEATS in the heads. Propane will kill these wimpy flame hardened seats. I run a 15 to 1 472 in a pulling truck. I recommend spending the extra couple bucks for forged pistons espically with propane. Hyper pistons just don't like hard use and heat cycling. Balance everything, go ARP bolts, match port a good intake to the heads, roller rockers, don't go overboard on the cam, good ignition system, and keep it reliable. As far as aftermarket cranks and rods , save your money. The stock truck crank and rods will handle 8k no problem. Mine rides the chip at 7800 most of the run, which 350ft takes us almost 3minutes.

question solved, sell your pos and buy mine:smokin:
oh ya 600+ hp

First of all you should be looking for a certain amount of torque, not hp. In a wheeling motor hp is sort of irrelevant(for most types of wheeling at least.) You want a nice flat torque curve from idle up to about 4-5,000 rpms, horsepower will take care of itself. Building a 600hp big block might take some coin, but throw a 4.140" to 4.300" stroke rotating assembly in it and 600+lb-ft won't be too hard with a little research. And trust me, it may only turn 5,000rpms, but a 450hp/600lb-ft big block would put a big smile on your face, and save some coin.

Plus, it's stupid easy to make that kind of power on pump gas.

www.460ford.com

It will answer any and all questions about 370-429-460 based motors. I was a chevy guy till I found that site. hehehe

www.460ford.com

It will answer any and all questions about 370-429-460 based motors. I was a chevy guy till I found that site. hehehe

A little late huh?:shaking:

Better late than never

I built a '69 429 once...wouldn't do it again. Go for the stroke over the revs...she'll appreciate it more.