Pontiac Cat64

im building a 421 and want to have 700rwhp while being able to drive it to the track(road course) and day today to work and long road trips. ill have a dart block and the large pistons 4.2 with 3.8'' crank and some racing heads still not sure which ones yet but will be 450cfm + and a aggressive cam less then .700 lift and the ablity to idle so a street strip cam with a lot of lift and a 2500-7000rpm rang. it will have a down draft fuel injection intake etc

im just curious of what other people have built and the hp they have made

id appreciate a lot of detail if you post about your build! Not just my ls7 makes 700rwhp with minor mods. because that doesn't help anyone haha

Millenium Z06

What?

DietCoke

iTrader: (18)

Solid or hydraulic? It's going to cost you a lot of money hydraulic. You're on the right track with big bore small stroke, but you aren't going to make that power with 7000 rpm.

Always2Slow

iTrader: (8)

Won't happen with a hydraulic. Your looking at a solid roller with a killer intake manifold setup on a really nice head think Mast 305 or better.

lil john

John B 427 solid roller set-up is the closest thing 700+rwhp.. N/A but heads- solid roller and intake are what going to live up the 700rwhp thing. The only thing about the LS7 head is the cost of the 4500 style intake $1600 or better by MAST.. The LS3 head has the Super Vic 4500 for less than $500. RPM and engine size help...The bigger the better. Cam wise you will be up there in lift or REVing it 2 the Moon.. so now you looking @ Shaft-mount rocker. It is do-able but you will need @ Least 770 fwhp or better so if you could get 800hp out the engine you are there 4 sure. You are now talkin a 421 800 hp set-up.
LS7 heads will work but you listed a 450 cfm head.
the LSX DR / MAST / or the raw port eledbrock all good heads but Costly
The LSX CT heads have smaller port and both LSX heads have there own intake both cheaper than the Mast intake.

Pontiac Cat64

thanks for the replys I know my 700rwhp goal is nuts and ill be lucking to get over 650rwhp which is still nuts. and yes a 7500 red line with soild rollers is a must. now my goal is to see how much I can get from engine with extreme flowing heads and intake with pump gas and what heads I should get.

im a normal human thus can not afford to buy mast heads and spending 8k just on complete heads (jesel rockers included on allpros lsw's) makes my head hurt :/ maybe someday i will. id like to build the engine for around 8k total and 5 is in the lower half haha and its getting dry sumped

how much flow can ported LS7 heads flow with 2.2 valves? if I can get 420 cfm out of a set it would make my life a lot easier

gnx7

iTrader: (28)

It can't be done for $8K. Certainly not with a real dry sump setup on it.

The factory LS7 dry sump is a band aid and not a true dry sump I'm sure you know. Oil pump cavitation problems at higher RPMs. Been there.... done that.

Morel hydraulic link bar lifters can get you to you your RPM goals safely.

blackonblacksls

iTrader: (1)

If you are only spending 5k I think you should be happy with 500rwhp

SHovV

iTrader: (1)

Sounds like you just need to supercharge it. You'll get the power, and all the drivability you're talking about.

Orange Juice

iTrader: (3)

Have you been in a car with 700 hp rear wheel. My little 550 rear wheel is pretty much unusable on a street tire in first and second gear. Third gear rolls will wiggle the back end. As far as the budget goes you have only talked motor. To support 700 hp requires a pretty stout fuel system, a rear end and a transmission that will also take the power. And you better throw in a big brake package because as quickly you accelerate you are going to need to brake. It would help also if you have an oil well in the back yard.

Millenium Z06

I agree with gnx7, if your budget is 8K you're not coming anywhere close to either number (700 or 650rwhp)NA.
You'd need 42x+ ci and some good heads plus a bottom end. I've got 12-14K in my new motor alone (ERL 434 and PRC 285's touched up by Frankenstein racing) and I'll be doing good to see 700 fly wheel hp.

I would think drivability with a 700rwhp NA car would be pretty rough too.

Pontiac Cat64

I was up late lol so im sorry my prospection was off lol. The car this engine is going into is a 1964 Pontiac catalina station wagon. kind of a weird but still cool car and you can put a 4x8 sheet of dry wall in the back and shut the tailgate or another engine or a bed so its practical haha

First im building the car: brakes 14''wildwood on all 4 corners. a chevelle front frame section so I can get hotchkis suspension and coilovers as well as the brake kit. the rear is an old 60s 9.3" Pontiac rear and ill rebuild it with aftermarket 31 spline axles and rebuilt posi etc eventually the car will get a built t56+drive shaft with the custom engine. Im putting at least 14k in it this year 8k is just wheels tires brakes suspension, the 5 k will get me an lq4 a Muncie drive train, custom drive shaft and blow prof bell and all the little pieces to make everything work im also planning on a cage so its not a death trap.

I plot out every nut and bolt with excel so im not just pulling this out of my *** haha

this year it will get an lq4 with then. a Muncie 4 speed because it will hold behind a cheap lq4. also with a 4 speed I can get an adapter plate and mate a t56 to the same bell housing and get the blow proof bell for a BBC 11''

So with a driving car built build ls3 heads and downdraft intake from speed master and it will hold me over so I can save up to build the 421 dart block with a dry sump, the solid roller lifters listed above, and a custom but streetable cam then put it in the car with the ls3 heads with nicer springs and supporting valve train to handle high rpm and lift etc and a built t56

then save up for aftermarket racingheads if needed



it will be build in stages probably more than 3years and ill probably spend 15k + on the racing 421 engine so yes it will cost a **** ton and ill have 40k into this car all part and all of my own work,

In addition im making custom dash and a fold away hidden 24" touch screen etc so its not just a dragcar/racecar its more of a representation of my passion for building hot rods and allow me to show high-end custom/hotrod shops what I can do so I can apprentice under them

I do appreciate the input guys and the 650-700fwhp 421 is a lot more feasible and practical. especially with street ability in mind I was just curious what people have gotten out of NA engines on pump gas because these engines are amazing but there are limits haha

Pontiac Cat64

this would make sence to a normal person but im nuts and it needs to have stacks because the look on this car is as much a factor as its functionality

John B

iTrader: (10)

Between the price of bare LS7 castings, Ti/Stainless valves, springs, seals, retainers, keepers, porting and Jesel rockers I have ~$9K in just my heads!

rindoze

iTrader: (1)

This idea you have is not going to happen. Long road trips and daily driver from 700HP NA.. no, not going to work unless you mind getting like 8MPG

STAR

iTrader: (1)

Spotted this over on the vette forum
http://forums.corvetteforum.com/c5-f...-690-rwhp.html

DietCoke

iTrader: (18)

502 inches and mozez heads... so... a 25k motor.

blackonblacksls

iTrader: (1)

I would guess even more than that

sugey

Robz on CF has one for sale right now for $15k. Destroked 427
Bad azz motor for sure running 9000 rpm's

STAR

iTrader: (1)

Big NA power costs money...I prefer forced induction.