landau73

G'day,just joined the forum and would appreciate some good advice(preferably tried and tested!)Have got a 393 stroker engine being completed at the machine shop.I recently purchased some 71' 4v closed chamber heads from the u.s and am wanting the engine to produce around the 500 hp mark at the rear wheels, and still run on pump fuel, whilst still being able to sit and idle on its own!Should i be getting the 4v's modified with exhaust inserts and what manifold would suit such horsepower?I want to keep the budget under control so is porting and testing costs going to see a better investment in chi 3v's?

falcon coupe

Mate i have 4v's, but if i was starting from scratch i would go CHI 3v's for sure.

See here :

400ci with a set of 185cc CHI's

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falcon coupe

See here :

400ci with a set of 185cc CHI's

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xdclevo

My first thought is WHY. You want near on 700FWHP on pump fuel. Good luck, as it it possible, but not safe of practical. Maybe if you simulate the Engine masters (usa) CHI headed motor, but as the builders says, you would never run in any kind of street car. I recon you would detonate it in a full weight ford.
I know there is a link with 730hp engine, but there is no proof that engine even exists, and if it does, i would like to see it!(real proof)

brenx

That'd want to be able to do a substancial amount fo rev's to make 700hp+ @ the fly. It can be done without any dough. Alloy will control detonation better than 4V's ever will. This alone will allow you to run higher compression which will aid in getting you where you want to be. You'd need to either do a real good port job or cnc port the heads. Rough guestimate and your looking around $10,000 in parts. You'd have to use an SVO block which is $4000 or so.

I'm hoping to have a 393 built myself before the end of the year but we'll see how we go. My aim is over 600hp. I don't aim to rev it any higher than my 351 did.

[edit]xdclevo ring BK Race engines it ain't hard. I doubt think you'll be standing if you were told the $ engine wise that kind of power needs.

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XB Fairmont (street car) 11.07@123.02mph.

turbomania

he wanted 500 at the rear wheels, so tell me xd clevo where did you get the 700 at the flywheel . 500rwhp does not equal 700fwhp .

turbomania

and that would mean he would be losing 200 hp through the driveline , id say there would be something drastically wrong with his driveline if that is the case

351ClevoCorty

I think his words were 'want near on 700FWHP' I think the comment was made that you would need in the vicinity of early to late 600's to comfortably achieve 500rwhp.

xdclevo

Your the expert, so you tell us the correct figures??
All i did was a "rough" calc of 700 - 30% which gave close to 500hp?

tony xa

I would go for chi 3v or the afd 4v alloy heads if money isn't a concern .
500rwhp is a desent amount of hp so I would look into the afd heads a little more .
I say this because alot of drag cars use afds and chi are used by street strip .
Relisticaly both can and would do this for you so my advise is call both and ask some questions see which one suits your needs .
Please keep us posted sounds nasty