As per request in this previous topic:
https://www.thirdgen.org/techbb2/sho...hreadid=108399
I have posted an updated list of the parts making up my future project which I have already started on. Now all of this was recommended some time ago by members on this site so I amp osting this to make sure everything jives. This all will be going into a 1991 GTA, not my 92 GTA. NOTE: These are just some of the mods, not all. It is a work in progress so please make sugestions.

Virgin 4-bolt 400 SBC with 4" crank for 426.7ci w/12.5:1 Compression and Forged Steel Crank/Rods/Pistons (4340 forging)
Brodix 8 Pro Aluminum heads with 220-230cc intake ports and 109.26cc combustion chambers
Intake Valves 2.080 and Exhaust Valves 1.600 in size
CompCams 240H-8-16 w/240/248 duration @.050 & 1:6 rockers
Siamiesed TPI intake manifold with worked SLP intake runners, all port matched.
1K cfm 58 mm Edlebrock Throttle Body
96 lb/hr Fuel Injectors
400 Damper and Flexplate
SLP Dual Inlet Firehawk Cold Air Kit
SLP Tri-Y headers
3 inch high flow cat
3 inch SLP cat-back

Possible SLP T-RAM if one can be found.

Custom chip
MSD ignition system
GM Performance 8.5mm plus wires
GM Performance Platinum spark plugs
160 amp alternator
Fuel Pressure Regulator
GM Peformance geared starter
Custom built 4L60 tranny
Custom stall converter
External tranny fluid cooler
3.42 gears with posi

 

110 cc chambers ? That's astronomical for a SBC! What are you thinking ? 91 lbs injectors... I doubt you'll need more then 30 lbs injectors !!!

 

virgin as in production? isn't going to happen. Not many factory blocks will take that kinda stroke because the modifications that need to be done to it......if you really plan to do this start off right with either a Dart Little M block or find a 2 bolt production block and convert to splayed mains

w/12.5:1 Compression and Forged Steel Crank/Rods/Pistons (4340 forging)

i hope you dont plan to run pump gas.......with that compression it isn't going to work unless you have a gigantic cam to bleed off pressure and then it wont be very streetable at all

Brodix 8 Pro Aluminum heads with 220-230cc intake ports and 109.26cc combustion chambers

i dont believe the -8 heads have an intake port that big......those heads wont work well with all those inches either. A good out of box head for a big motor like this would be a Track 1X head with the 40/60 vavle spacing. Also, there is no small block chevy head on earth that has that big of a combustion chamber....not sure where you got those numbers. If this is an all motor combination, try to keep the chamber small to about a 60cc so that more of the flame travel occurs from the piston design
Intake Valves 2.080 and Exhaust Valves 1.600 in size

fine.....no problems here

[/b]CompCams 240H-8-16 w/240/248 duration @.050 & 1:6 rockers[/b

way too small.......a big motor like that can have a easy 250/250 .630/.630 cam and idle fine because of all those inches

Siamiesed TPI intake manifold with worked SLP intake runners, all port matched.

waste of money and it wouldn't fit the big intake port on the heads......you are going to need a good intake to feed that motor. Use either a heavily ported Victor Jr and convert it to use for fuel injection or just use an out of box Super Victor and convert to fuel injection

1K cfm 58 mm Edlebrock Throttle Body

use about a 1400cfm 4 barrel type throttle body

96 lb/hr Fuel Injectors

too big.......you dont need that big of an injector unless you plan to spray a lot of nitrous DRY or this is a boosted motor and if so.....you have a whole different combo that you are going to need to address

400 Damper and Flexplate

obviously......get a ATI dampner you are going to have to sping the motor to 7000 to get the most out of it, and you'll need a good dampner

SLP Dual Inlet Firehawk Cold Air Kit

just use a high flowing carb style air filter

SLP Tri-Y headers
3 inch high flow cat
3 inch SLP cat-back

cough...choke...that is what the motor is going to do if you put that tight of an exhaust on it, at the very least get some cheapo hedman long tubes or get some hooker longtubes which are still small for a motor like this but much easier and cheaper to work with then the hedman hustler big tube headers

 

I mean a virgin block as in one that has not been bored over, I would however take a 30 over if I found one in a 4 bolt but nothing more.

If you read in the other post, I plan on running 100+ octane pump gas from a local station here in my town.

What heads do you suggest then?

I know that cam is small but remember, I'm in CA. I need to keep it smog legal so it can't be too crazy on the idle. What cam would you suggest?

I am for sure going modded TPI or T-Ram so lets build around that. I figure I can port it to flow about 1300 cfm or more starting with the factory plenum, SLP runners, and an after market intake to work.

What injectors do you suggest?

So what overall engine package would you recommend for the most power with a seriously worked TPI system, a 427 SBC, and high compression and still be smog legal????

 

Originally posted by 92GTA
I mean a virgin block as in one that has not been bored over, I would however take a 30 over if I found one in a 4 bolt but nothing more.

first off i doubt you'd find one that is standard bore and even if you do.....there are not many factory blocks that are going to have the the ability to build this motor...talk to a machine shop and they'll explain it for you

If you read in the other post, I plan on running 100+ octane pump gas from a local station here in my town.

ok

What heads do you suggest then?

at bare minimum a brodix track 1 head or a AFR 210 head....but the Track 1X head would be ideal due to the larger ports and 60/40 valve spacing but are more expensive to use because i believe you need to use offset lifters/shaft rockers

I know that cam is small but remember, I'm in CA. I need to keep it smog legal so it can't be too crazy on the idle. What cam would you suggest?

lol......i doubt a motor like this would pass any emissions. You'd really have to undercam the motor for emissions and then it would make the extra cubes unuseable in my opinion, you'd be better off with a 406 and suitable cam to pass emissions

I am for sure going modded TPI or T-Ram so lets build around that. I figure I can port it to flow about 1300 cfm or more starting with the factory plenum, SLP runners, and an after market intake to work.

no kinda tpi setup is going to be able to feed a 400" motor WELL. It WILL work but as the inches go up and you keep the TPI you are meeting a huge situation of dimishing returns. Go talk to some of the people on the swap board who use TPI and 400". If you really want to keep the TPI stuff, build either a 383 or 406

What injectors do you suggest?

depends on horsepower goals and application......i know of all motor setups going 9.70s on motor making more hp than you will with this setup running on stock computers and 30lb SVOs

So what overall engine package would you recommend for the most power with a seriously worked TPI system, a 427 SBC, and high compression and still be smog legal????

to be honest i wouldn't. If you want to make this a serious mean motor someday then i'd suggest a 406" for now with nothing more than a 200cc intake port on the head because there is no kind of TPI intake that will fit a 1206 intake gasket without some welding done to the top of the intake port on the base. So then you are kinda choking it

i think you'd be really happy and it would be much easier on the wallet to build a 383 with a set of decent heads and a ported/siamesed TPI setup......it wouldn't make huge hp but it would make for a great street motor and you could cam it to agree with emissions too