TwoFast4Lv

iTrader: (8)

Hey guys. I know some of the faster guys have had this done. We used to have a Sponsor that did them but I have not seen him in a while

The Question is where to get my Brodix -18 Spread port head converted to LT1 at

Just about done with running the 23 Degree handicap

jimbob

iTrader: (4)

Bastard..........

What, next thing you'll be saying is your going BIGG TURBO on thier too....

TwoFast4Lv

iTrader: (8)

Naw. After pounding the numbers not sure I could get the -18 chambers big enough for boost

So just do solid roller new heads, intake and headers and roll the dice

Tony Shepherd

iTrader: (4)

I am sure PortPros can do it.

Speed Density

iTrader: (38)

Ive heard Total Engine Airflow does it also.

Tony.

Ls1Bait

Could someone tell me what the 23* handicap means? I know we have 23* heads but dont gen 1 small blocks have 23* heads? And what is the big benefit to running the gen 1 heads? Sorry just want to learn...........

daniel6718

iTrader: (36)

the less angel, such as 18, will normally be ported and flow better then 23, i think this is why ls1 make more power ported

SmokedOutZ28

iTrader: (35)

What has to be changed for 18 degree heads to work, I know theres some work involved in having the heads converted because im thinking of going that route but what has to be changed in the valvetrain area for them (18 degree) to work?

TwoFast4Lv

iTrader: (8)

Smoke. Take the valve train you have now and set it a side. start over from scratch with

Offset Solid roller lifters
Nice big Solid roller cam
Offset Shaft mount Jesel or T/D rockers
Add THIS Custom Hogans Intake and a set of custom headers and you have my goal of trying to make over 500RWHP Before i pushed the button on a 200 shot fogger

jimbob

iTrader: (4)

Pistons...Valve train/shaft mount, off set and offset mechanical lifters...They due make off set roller rockers that may work on certain 18 degree heads...You would still have to watch the lifters though...Usually guys going this route would install a mechanical cam anyways, and use off set 150-180 thousands lifters..

engineermike

ALOT of stuff.

- The 18 deg heads need a different intake manifold. Last time I checked, there are no production intake manifolds for the 18 deg heads that accept fuel injectors. So, you need to have an SP intake converted to fuel injection. A SP conversion on an LTx is alot of work to begin with. Count in alot of fittings, hoses, regulator, TB elbow, MAP mount, cowl induction hood, etc. . .

- The intake ports are wider so they move the pushrod over to clear the port. This means you have to have, at a minimum, shaft rockers with offset intake pushrods.

- Since the pushrods are moved over, you may need offset solid roller lifters on the intake side.

- Center bolt valve covers won't fit, nor would they clear the shaft rockers anyway, so new valve-covers are needed.

- Most 18 deg heads have raised and spread exhaust ports, so new headers are needed.

18 deg heads are the way to go for big power. They can even benefit small-cammed engines too. They are definitely the way to get rid of the 50 hp handicap that we have under the LSx engines since they already basically have this technology.

engineermike

500 rwhp on an 18 deg motor should be cake. I believe, if built right 550 - 600 rwhp is possible.

Just for comparison.

A local engine shop builds alot of dirt track engines. They build an engine for a popular internet guy that everyone knows. The engine used 23 deg heads and made 690 hp on an engine dyno. When installed in a car, it made 540 rwhp.

The same engine shop built an 18 deg motor that made 800 hp on the same engine dyno. Put that in a car and, by the same ratio, it should make 625 rwhp.

Mike

engineermike

Well, let's think about this for a sec. . .

The exhaust side needs special headers, so no work needs to be done there.

Clearly, you can't install an LT1 intake on there. Not even LT4 will work

Valvetrain is totally different.

The only thing I can think of that needs converting is:
a) Drill the water crossover holes in the back of the heads. You can do this with a hand-drill if you want, then run -AN hose instead of the PITA hard pipe.
b) Drill the deck surface for water return. Again, you can use a head gasket as a template, then drill them yourself.
c) Delete the water passage holes on the intake manifold surface. Or not. The new SP intake should cover the rear holes and the front will connect to a water neck that you could simply blank off with a piece of plate cut to the right shape.

What do you think?

SmokedOutZ28

iTrader: (35)

Thanks guys for the tips, This sounds promising as i would love to hit the 500+ RWHP mark with my lil ole lt1.

Twofast: How can i get in contact with the company that built that intake for you?

Who's going to perform the work on the heads? as im curious to see a price tag for everything.

TwoFast4Lv

iTrader: (8)

Hey Mike take a look at link

I already have the heads and Intake

BizZzatch350

iTrader: (33)

LME could possibly do it

RVR

Dennis at AFD (AirFlow Development). No doubt.

IllusionalTA

iTrader: (9)

yep...fairly easy conversion.. Just dennis is swamped right now... Btw.. not all 23 Deg. heads are handicapped.

z_speedfreak

iTrader: (3)

im curious too, ballpark how much does it cost to convert to 18deg sbc heads? lol im thinking wayyyy down the line for me now..

TwoFast4Lv

iTrader: (8)

I agree...but if I am going to spend the money ....Why spend twice as much for the Good 23* heads. I have had this set of heads going on five years. When I got them a good set of 23* heads started at $4,300 then add all the same things you need for 18* heads. It seemed like a no brainer. Our cars are so heavy it is easy to take the Penalty in most class's