Turnin'LT4

iTrader: (1)

Just wondering what the highest LT1/4 rear wheel numbers are. Doesn't matter cubes, just has to be LT1 block and intake.

Vendetta

What's up George


Joe Overton is running 9.3s N/A stock block LT1 but he's not on an LTX intake

METALBEAST

iTrader: (1)

I think he is talking about power not times Jon. The highest I have seen is 506 RWHP from a 383 solid roller setup. He went by Godspeed on LT1tech. Joe O is putting down somewhere in the 52X range (I think) with his 388 motor.

Vendetta

My bad, I didn't read it all the way through

Jordan57

I think 'mindgame' with his 38x stroker with the gm615 heads converted. Don't know if its an LTX intake though. He is well above 500rwhp though.

TwoFast4Lv

iTrader: (8)

I want to say it was 565 with a LT4 intake

METALBEAST

iTrader: (1)

Good lord! That is amazing! What displacement is that beast?

Vendetta

TwoFast4Lv

iTrader: (8)

It was a custom built 383 18° head LT4 motor. MindGame builds those little projects to amuse him self and prove a point now and then from what I can tell

FASTFATBOY

iTrader: (23)

Only a handfull have made 500 at the wheels with a 23* head and stock style intake, all motor, all were six speed cars if I remember, Mindgames car is impressive..but to me does not count....18* heads and a LT4 intake that uses spacers BUT 570 to the wheels is impressive no doubt, car runs 9.70's in street trim(also a six speed).

My Dad and I are gonna try to make the number with an automatic and 23* heads, but not with a stock intake..tall order I know....but this is not the typical LT1 build either.


David

Jordan57

Why do the 18 degree heads not count? Because they were converted to reverse cooling? Or because the intake has to be modded to fit? This is only scratching the surface of LT1 development. Ideally someone should build a 38X with 15 degree heads...(ala yates, roush, nascar style) with a wilson manifold, solid roller cam, and about 12.5:1 compression or so and make over 600rwhp. That would be sweet.

Basically what im saying is that the 23 degree heads just dont have the potential as a 18 degree, or 15 degree head for that matter. Valvetrain angle is far from optimal as are a bunch of other head/ flow characteristics of the 23 degree head. I think you will be hard pressed to make that sort of power out of a 23 degree head.

FASTFATBOY

iTrader: (23)

Well to me 15*/18* heads are exotic, Mindgame is a cool dude and I like what he has done, but a LT1 did not ever come with a 18* or 15* head and is out of reach for the most of us. Mindgame's car may very well be at the 600 rwhp level, the last time I talked to him he said those numbers were from long ago and he has made numerous changes since then but has not re-dynoed.

Overton's car, Ed Wright's car, ou812z/28 on this board's car are much more impressive, to me anyway. Overton's car runs in the 9's and the other two run low 10's at 3350lbs all motor. A friend of mine went 10.50's@3350lbs with stock casting LT1 heads and a stealth ram, the car had low 10's in it but he parted it out.

Ed Wrights car has LT4 heads and intake, that's Probably the quickest near factory car I know of and he is on the factory PCM.


My Dad and I have a set of 23* heads that flow like a set of 18* heads, they flow what Mingames did(according to him) and we have a better intake than he does, we make not make the number at the wheels he does because of the automatic, but will make the same at the flywheel that he does.

David

Jordan57

are you going to run a th400 or 4l60e? def would go faster with the th400 in my experience and not blow it to smitherines (sp?).

on another note...who makes 15 degree heads for sbc? that would be raw for an all out n/a motor.

METALBEAST

iTrader: (1)

Well, I am looking for between 450-470 RWHP with my stroker motor. Still am not certain whether I want to got with a 383 or 396. I plan on using fully ported AFR 210s or at minimum GM LT4s fully ported port matched to an LT4 intake. We will see what happens. I will be disappointed with less than 450 RWHP.

GhostZ

An LT1 never came with a solid roller or a PG either but that doesn't take away from what some folks are doing with them.

I guess you could consider 18 or 15* heads exotic but I wouldn't consider them any more out of reach than a complete FI setup.

N20Dave

iTrader: (7)

I'm trying to see your logic about the exotic parts. Please tell me how that stealth ram is even close to an LTx intake. Because if you are going to consider 15 / 18* stuff exotic then you have to consider a tunnel ram exotic as well. That is in efect what a stealth ram is. Also, do you have offset lifters, shaft rockers or anything like that on your 23* heads? Or do you use all factory off the shelf valvetrain components? What's the port size on those?

If I'm sounding like a dick I don't mean to be but I hear this argument all the time about my SB2 stuff. Now that I can see as being exotic but anything less is not imho.

FASTFATBOY

iTrader: (23)

I do not have offset rockers, standard port configuration. We do have shaft rockers. Port cc is 240. Tunnel ram exotic? A stealthram is closer to a stock style intake to me than a Victor Jr modded to fit an LT1, at least it has a forward facing throttlebody. Tunnel rams have been around since the 60's all Holley did was put a box plenum on top, pop some holes in the end to mount a throttlebody, not exotic.

GM 18*, and canted valve SB2.2...to me are exotic....you have to buy all the supporting members to make the stuff work, intake, rocker arms, pushrods along with having headers made.

Our heads are standard 23* small block chevy heads that are converted to fit an LT1. All standard small block chevy stuff will work with them including Hedman 1 7/8 headers, shaft rockers etc.

Now our intake may be considered exotic as it is the only one on the planet like it, but hey you gotta do some stuff different to go faster.

Seeing as Mingames 18* 383 LT1 is the only one I know of, there may be more, who knows....that in itself makes it exotic.


David

raymond mckinney

iTrader: (4)

joe o' is around 580-600 wheel! with lt4 intake I'd say 520-560 wheel!

RamAir95TA

iTrader: (2)

Jim LaBreck built a solid roller 396 LT1 using a Hogans sheet metal intake that put down 647 flywheel horsepower.

Rpm2800

I have a magazine of a C4 corvette and it has I think lt4 heads with a modified ( cut and welded) lt4 intake . It is a 421 I think , and they state 575 at the wheels on motor.