This is sort of a side question about this post, but with the guys running stock cubes to slighlty over, why is it that you prefer staying close to stock /over going with something like a 427 or larger. i thought i would ask, b/c i plan on going to something like a 427 or 430ish range, and wanted to get your opinions on this, im looking for something in the 800rwhp range, and yes this is going to be a daily driver, basic setup in mind is 427, or 436 forged internals, and bottom end, redone suspension,TH400 with GV overdrive, ford 9 inch with 3.56-3.73, F.A.S.T system, and the elminator kit from LS1 speed, making around 10-13,15lbs of boost, with alcohol injection, thanks guys for your thoughts

 

What block would you use for a 427ci?

The issue for some is cost.

 

A iron block 408 is the biggest I would go unless you are going to use a C5R block. Thats going o be my next motor with some Mongoose AFR heads.

 

well that was one of the things i was thinking about, yeah as most money is an issue, highway patrolmen dont make that much, but this is going to take a couple of years to see finalized, no it wont be a c5r, more than likely its going to be a 427-436 built by ARE. im basically just trying to figure out why the larger cubes are a hinderence as opposed to a positive, being able to reach to power of stock to slightly over cubes, at a lower boost level, and with the intercooler, and injection help to deter the detonation issue, but any ideas or opinions would be appreciated

 

I seriously hope that you are kidding about having ARE build a motor for you.

 

say it ain't so, Joe!

 

well like i said opinions are app. so what reasons are you all not like an ARE motor. its either that or have * MORE*build mine being that i live like 2 and a half hours from them

 

Hey David,

If you want to keep your a/c the best Turbo route would be the PTK kit. Some guy running their old (not as good as the newer GEN II kit) LT1 kit just ran a 10.1 at 150 mph!!!!!! This was with a 355ci motor and 20 psi at 36xx lbs. The LS1 kit will be BADASS!!

This will also be the only kit out of the 3 (TTi race kit and Ls1speed) that will keep the a/c (LS1 speed uses the TTi hot parts). Again, not knocking those kits at all, becasue they are making mad power and will continue to put down some nasty times, but the PTK has a better true "street car" design.

Call Jose with FI at 256-658-5798 to get some more info on the PTK kit
or call Ls1speed about theirs. I know the F-1 is a damn good blower and is capable of a **** load of power(which is obvious, just look what Gordon is doing, 830rwhp and still working out the kinks), but IMHO the turbo systems are a better way to go.

As far as the tranys go, most venders make a bolt-in th400. I would talk to an few poeple that run one like KP. He would know more about that than me.


Dj--I thing the reason people are not going to the larger cubed motors for 800hp is because of cost and the fact that they don’t have too. I’m sure everyone would love a 427, but 347ci is enough to run low 8’s in some cars. IMHO if you need to go faster than that in a street car, just go BBC.

Later,
Dave

 

Regarding ARE I don't know that I would use them right now, might be a little rocky over there right now.

A 427ci could cost $15-20K by itself for what you want, up to $25K in some cases, might want to keep that in mind.

 

super dave z, thanks for chiming in, i appreciate the feedback, i wanted to go with bigger cubes less boost, just so that the motor wouldnt be under so much stress from the boost, i understand that a 347 forged block can take a lot of abuse, and my hats off to all the guys running those setups b/c the are phenominal, but like i said earlier in the post, this is going to take a couple of years to finalize, so a time frame im not really worried about, the suspension, trans, and all that i already know what im going to run, and on a side note, b/c like i said wanting to run more cubes, and less boost, that would allow me if i wanted to, to stretch the "potential" of the 427, so that if i wanted to, i could raise the boost, and go over the 800rwhp mark that is my goal

 

A 427 would be okay if you want to make 800 at the wheels on 10# of boost and pump gas
https://ls1tech.com/forums/showthrea...ht=performance

A Darton wet sleeve would be plenty strong for that power level. If anyone wants to tell you otherwise, talk to Steve at RED.

 

Biggest understatement ever.....

 

I can't believe they are still in play.

 

I had 2 motors done by them. Both had problems. They fixed it the first time but the second time they left me out to dry. Don't go to ARE. They still owe me a rev kit and a LS6 intake.

 

It's is impossible for me to believe that anyone at this site would still do business with ARE.

 

i must have missed that one...is there a thread on what happened...if so post link please

 

Sorry for stepping on this thread.

 

The reason a 427-436 isn't going to do you much over a 408 or even a 393 or 383 is because of a few reasons.

A) You need a very large piston dish to reach any kind of sane compression level for a blower. This is bad for 2 reasons. One is more dish volume means less mass in the piston crown, which makes for a weaker piston. Two you're going to need to spend some $$$ for some custom pistons to get that compression down.

B) For a 427 you're going to need to go with a C5R block or a sleeved aluminum block. Both of those cost a LOT of money over a standard iron block or your stock aluminum block, and for what? A few extra ft-lbs of torque over a 408?

C) Availability of replacement parts. Melt down a piston or bust up some ringlands in a stock bore/4" stroke iron block 402, what are you going to do? Go buy a set of off the shelf .030 over pistons, and rebuild your motor. Melt down a piston in your sleeved 4.125" bore aluminum block, what are you going to do? First, curse your *** off for going with such a large bore and expensive block in the first place, then decide if you're going to resleeve it or just sell it off and start off fresh.

Also, why are you planning on running alcohol injection? Instead of following the LS1tech way and building a 9:1 or 9.5:1 motor, let the blower do the work. Run 8.5:1 compression or even lower, and you'll make 800 RWHP on pump gas without much effort, and not have to deal with alcohol.

 

Or go less compression then that.

 

8.8:1 is working just fine for me and I should see over 20 psi once we get everything settled.