phoronZ

I am very seriously planning on building a 427 with a 400 block from world products. I already have a HSR that I plan to use. I would like to walk the thin line between raw horsepower and streetable power here. I am looking for suggestion on heads/cam and any problems anyone thinks I could run into. ALso anyone who could point me in the right direction as far as prom burning for such a setup would be extremely helpful. Thanks

P.S. I am hoping for 400hp from this.

unknown_host

iTrader: (1)

lol 400 horsepower isn't walking the line but that's cool . Vortec heads and a small cam on a 350 can get you 400 horsepower. Big cubes and compression will eat up the lope of a decent sized cam, I say go for 500 horsepower with a hydraulic roller camshaft. You will make enough torque for it to be streetable.

ljnowell

With those kinds of cubes, getting 400 is simple. Some decent heads, a good hydro roller a dual plane intake and a decent carb. Some exact recommendations will take some more info like how much do you want to spend, what do you already have, etc.

PS. I would go for around 500hp if the budget is there, because the engine will do it easily.

phoronZ

I already have the "hsr" that is all. Everything else is open to suggestion. So the carb idea is out. Keeping in mind that i will drive around with this car more often than taking it down the strip.

ljnowell

It seems like you are set on a 427, but there are way lots cheaper methods of getting the hp you are talking about. you could make a 383 combo for about half as much on the bottom end, if not less. Still make that much hp and save money for other mods, such as suspension, for the rest of the car. The best engine in the world is worthless if you cant hook up.

AlkyIROC

Using an aftermarket block, it's easier and more common to make a 434 than a 427.

Any good engine can make 1hp per CID so 400hp will be easy. Since you're taking about a big engine, you need to feed it enough air to make hp. Get some good flowing aftermarket heads. Any factory head without a lot of work done to them will be a restriction. For the price of the work, you can buy better aftermarket heads.

Any camshaft with a minimum of .550 lift. The exact cam grind will be up to you. There are hundreds of different grinds in flat tappets and rollers. Hydraulics and solids. You don't need an aggressive race grind in a daily driver etc.

daverr

iTrader: (1)

434 are harder to make than say 426,406. I have a sbc dart block ,and we had to grind away to make a 3.875 crank work.

If your building a 427 with a aftermarket block dont go cheap with the heads, unless u plan to use force induction. Aftermarket blocks can handle alot of power.

tilstad

It seems world products blocks have more clearance built into them, since they stated on the phone to me that a 4 inch stroke crank with H beam rods would clear out of the box. At least if you use the same rods as they do, I think they use scat or eagle rods.

unknown_host

iTrader: (1)

To get back on topic, I really don't see why he wants/needs an aftermarket block. An aftermarket block would sky rocket his build costs if he is on any kind of budget.

Realistically, you could get a good 400 block and easily meet your power goals.

heavy_chevy29

i have a world block that scott shafiroff used to make my 434. as everyone else said, 400hp is no sweat with that much cubes. my motor makes 576hp and 582ft-lbs without breaking a sweat. and yes it is streetable. i wouldnt reccommend it for a daily driver but it make a real nice toy. use good heads and a roller cam. my motor has brodix 227cc heads and a hydraulic roller cam.

phoronZ

Thanks for all the responses. I had intended to get the motown 400 block. However on the weekend a friend of mine came up with a brand new motown 350 with splayed mains. From all the info I managed to get, seems you can get a 350 block for around $100-200 for a two bolt main. Four bolts are harder to come by at least where I am. Most guys want around $400 for a four bolt block. After all the machining is done, your in the 1500 dollar region for a factory used block. My thinking was if I was to invest 5k or more into a new engine why not start off spending the extra 500 for an aftermarket far superior block that is ready to go as is. I really want to make sure and get this right the first time and not hope for the best with an old block.

That being said I have now gone with a 350 block, so its now going to be a 383. Other than that I have the HSR ready for an engine. I have been reading on here steadily trying to decide on heads/ cam and the rest. Any advice here would be great. I admit to not being a super expert on engines which is one of the reasons I am having this engine built by a professional. Still I am looking for feedback and advice on how to make a high power, reliable street engine for my ride. Thanks in advance to all.