First question is how much is your budget? You can do a big hp build fairly cheap but it might not last very long.

 

Was researching E85 meth injection, It being streetable is necessary.
Infinite.

 

If you want a 4.125 bore, you should either have your block sleeved, or ditch it for an LSX or LSNext block. I don't know of a production block that's happy going to a 4.125 bore. I would budget about 3,000 for that

I prefer the bigger valve heads, LS3 or LS7, but your 427 will breathe better with at least a CNC port job on those 799 heads.

Looking at your crank...4.125 bore and 4.125 stroke is 440ci, not 427...for the 427 you want a 4.125 bore and 4.000 stroke.

BTR spring kits are fine, I would get a custom spec cam from them, they will match a spring kit to your cam for your goals. It only costs like an extra $20 or something over an off-the-shelf cam, just takes a while longer to get it.

With an infinite budget, you're better off just dropping it off at a shop and telling them what goals you want.

 

This is an LSX block kinda hard to miss the big "LSX" plastered around the bright orange block. Thought about going with aftermarket heads or just getting the stock heads worked on, wasn't sure which was a better option. And the stroke was a mistype, had been typing 4.125 all day and just slipped my mind. Thanks for the cam info.

 

The 799 heads are not 6-bolt heads, which you will want with big boost. You might want to look into aftermarket 6-bolt heads, to go with your 6-bolt block.

 

Have any recommendations?

 

I say go with the Brodix BR7's or the Mast Black Label 285cc's

 

Thanks for the suggestions

 

You would be remiss if you didn't check out what AFR has to offer.

 

Thanks for the tip

 

Do AFR make a 6 bolt LS head?

 

Well, if money is no object.....

Noonan water cooled LS Edge block, standard deck height
...4.125 bore, 4" stroke
Noonan billet water deck heads - aim compression for 9.5:1 to 10:1
Noonan turbo intake manifold - 2 injectors per port
Procharger F-2. If you prefer turbo, Garret GTX4781R
Holley Dominator controller
Jolt custom harness
Magnafuel Prostar 625 fuel pump
Jesel lifters and 1.8 ratio rockers
Manton 7/16 pushrods

I haven't been keeping track, but this is probably in the neighborhood of $40K, with another few thousand to go in ancillary crap (such as throttle body and headers). Should produce about 1600 HP with no fear of damaging anything. Honestly, you could probably take this to 3000 HP before you had to worry about the block or heads.

If you want something a bit more practical and not so far into the realm of insanity, substitute as follows:

LSNext block
Brodix BR7 BS 300 heads -- send to one of the big names (Mamo, Darrin Morgan, Greg Good to name a few) for some extra lovin'
FAST LSXHR manifold
Probably knocked $10K off the price tag right there, but you're going to have less headroom if you start getting greedy vs the noonan foundation.

For the cam, I'd be thinking in the neighborhood of 244/262 - 115+5. Should be very streetable with a 7.0L.

Another very interesting option would be to consider running a shorter stroke with more boost. 3.622 crank with 4.125 bore for a 388. This would de-torque it a bit down low and make it easier to drive, while revving quite well to compensate for the reduction in displacement. You'd make the same power as a 427, but with less torque.

 

I am sticking with my block and boring it to 427, that’s not changing along with my Hp goal of 800-900 no more no less

 

I doubt anyone is trying to dissuade you from your plan, just presenting options in case you may be on the fence about anything.

 

i understand

 

OK, that's pretty easy honestly. My LS7-based 440 is knocking on the door of 700 to the tires NA right now.

I would still go with the Brodix BR7 BS 300 heads. Canted valve train, 6 bolts, etc, and very good top end flow numbers. If you want to stick with GM heads, the LSX DR is a great option.
I would also put the cam about where I said in the other post. 244/262 range with 0.700" lift. If you want REALLY good street manners, you could shrink the cam up and just run a tad more boost. 236/254-117+3 will drive easily and be easy to tune.
Jesel rockers.
With the LSX block, you'll have more lifter options. A great blend of price and performance is the Johnson 2110 hydraulic lifter.
LSXHR intake
garret 42-1200 turbo. A bit smaller, since you're not interested in headroom up top. Should spool up nicely too. Set your blow off valve to 15 psi for starters and work up or down accordingly.
Walbro 450 LPH fuel pump
Other odds and ends accordingly.

 

good info thank you

 

yessir.

LS3 Mongoose 260CC Part # 1840, recommended up to 454ci.

 

A 73mm turbo with a baby turbine on a 427 isn't a great idea! That turbo is almost too small for a 5.3L, neutering an LSX stroker by it would not be a wise choice. He wants to spend money on big cubes and high flowing heads, get a real turbo with a larger turbine to support that efficiency.

 

427 with top of the line heads is almost a waste for 800-900.

With that block and infinite budget would you consider trying it NA?

A 427 with any heads and an F1a-94 or proper turbo could make 900 on accident with no timing in it.