Moparts

Indy Horsepower !

Posted By: Wedgeman

Indy Horsepower ! - 02/18/11 06:52 AM

HI guys !
Putting my combo together and get a lt of comments from it, but never from people who know what they are talking about, so I'm turning to you.
Here is what I have:
408 cid
360-1 heads 210cc int runner version
race port
10.9:1 cr 190lbs cranking pressure
HUghes engines cam 252/256* dur @ 50
626 lift
Indy Intake 800 cfm Holey
904 trans, 3800 stall, low gearset
3.91 rear gear on 35 spline spool
28x9 ET drag slicks
In a 67 Barracuda 3300 lbs
elec water pump, manual steering

what would me my Et's ? HP ?

Trying to clear up all the [Edited by Moparts - Family Friendly Site - Keep it clean] coming to me and get reliable comments...

Dan
Posted By: cbarracuda

Re: Indy Horsepower ! - 02/18/11 07:33 AM

10.50
Posted By: Quicktree

Re: Indy Horsepower ! - 02/18/11 11:20 AM

kind of mis-matched combo, but it should make some power. needs more converter/gear and with a 9" slick you better have a well sorted out suspension.or be able to control the power down low. ET guess somewhere in the 10s if it hooks
Posted By: MR_P_BODY

Re: Indy Horsepower ! - 02/18/11 12:49 PM

10.7 - 10.8... if all goes good... I'm assuming this
is a track car... I'm curious why that duration...
seems short for a 408(strokers like duration) and
they like carb
Posted By: 408strokerdart

Re: Indy Horsepower ! - 02/18/11 02:05 PM

Quote:

10.7 - 10.8... if all goes good... I'm assuming this
is a track car... I'm curious why that duration...
seems short for a 408(strokers like duration) and
they like carb




Was thinking the same thing about both the cam and carb. Duration looks at least 10 degrees to short and it would love a 950 carb.
Posted By: mopar dave

Re: Indy Horsepower ! - 02/18/11 04:16 PM

my combo was very simular to yours at one time,accept i had a 4.10 with 727 and ran 11.30@122.
Posted By: theman440

Re: Indy Horsepower ! - 02/18/11 04:45 PM

11.20's tell us how it comes out.
Posted By: mopar dave

Re: Indy Horsepower ! - 02/18/11 05:12 PM

my 60's were 1.6 at the time.
Posted By: TheOtherDodge

Re: Indy Horsepower ! - 02/18/11 05:30 PM

Guys, notice he is running only a 28" tire so he isn't too far off on gearing and converter.

When I had a home ported stock headed 408, .540 flat solid, 950hp carb, 4.56 gear, 30" tire, 4000 stall, 3500 lbs, I went 11.20 at 119.

He should be all over 10.7's.

But, with a little more gear and converter, easy mid 10's.
Posted By: Wedgeman

Re: Indy Horsepower ! - 02/19/11 01:05 AM

Thanks for all your input guys.
First, I wanted to choose that cam because I did not want to let too much pressure out, and stay around 185 cranking pressure

Second, remember that I run a 904 with a low gearset, wich make a 3.91:1 act like a 4.30!
You think it would be wrong to keep my 28'' slicks ?


What would you change?

Dan
Posted By: Wedgeman

Re: Indy Horsepower ! - 02/19/11 01:11 AM

I agree, I will look very closely at a bigger carb

Dan
Posted By: PUNK

Re: Indy Horsepower ! - 02/19/11 01:15 AM

I think with the right converter, trans and gear that the combo should be good for low 10s. My brothers car sounds quite similar to what you are explaning and it goes 10.50s @ 125 with a 28X9 Hoosier slick. You heads are bigger, cam seems more aggressive and the cubes are more than ours...I think you will go faster than 10.50s.

Attached picture 6483108-2011Feb06016.jpg
Posted By: S/ST 3040

Re: Indy Horsepower ! - 02/19/11 01:43 AM

Quote:

I think with the right converter, trans and gear that the combo should be good for low 10s. My brothers car sounds quite similar to what you are explaning and it goes 10.50s @ 125 with a 28X9 Hoosier slick. You heads are bigger, cam seems more aggressive and the cubes are more than ours...I think you will go faster than 10.50s.



I figured between 535 and 550 HP. Should go 129 MPH+ @ 3300 lbs.

Posted By: fishy340

Re: Indy Horsepower ! - 02/19/11 02:09 AM

Quote:

10.50

maybe a 30 or 40 car is heavy
Posted By: bigtimeauto

Re: Indy Horsepower ! - 02/19/11 04:15 AM

Quote:

Second, remember that I run a 904 with a low gearset, wich make a 3.91:1 act like a 4.30!




You would have been better off changing the rear gear instead of the low gearset. A drag race engine doesn't like the big rpm drop on the gear change. Make sure you get a good converter.
Posted By: Wedgeman

Re: Indy Horsepower ! - 02/19/11 05:50 PM

I will looks closely at that too,
Dan
Posted By: Cab_Burge

Re: Indy Horsepower ! - 02/19/11 06:21 PM

Quote:

Quote:

Second, remember that I run a 904 with a low gearset, wich make a 3.91:1 act like a 4.30!




You would have been better off changing the rear gear instead of the low gearset. A drag race engine doesn't like the big rpm drop on the gear change. Make sure you get a good converter.

Mabe a all out high RPM special drag motor doesn't like big RPM drops in the higher gears changes like the 3 to 4 gear and 4 to 5th gear changes but most of the low HP(under 600 HP)automatic cars I know love the low gear sets on small tires
Posted By: sshemi

Re: Indy Horsepower ! - 02/19/11 09:33 PM

I dont see this combo being too far off.
Its deffenitly not perfect but....
I would say 10.5 when sorted out.
Posted By: bigtimeauto

Re: Indy Horsepower ! - 02/20/11 12:29 AM

Quote:

Quote:

Quote:

Second, remember that I run a 904 with a low gearset, wich make a 3.91:1 act like a 4.30!




You would have been better off changing the rear gear instead of the low gearset. A drag race engine doesn't like the big rpm drop on the gear change. Make sure you get a good converter.

Mabe a all out high RPM special drag motor doesn't like big RPM drops in the higher gears changes like the 3 to 4 gear and 4 to 5th gear changes but most of the low HP(under 600 HP)automatic cars I know love the low gear sets on small tires




A lower horsepower engine will love the lower first gear but hate the gear change drop and the long high gear pull where the more rear gear will make the engine happier all across the board.
Posted By: Sport440

Re: Indy Horsepower ! - 02/20/11 12:38 AM

I think the combos pretty good except for the stall. It could be higher IMO, more like 4500 to 4800. The gearing is fine, those 9 x 28 MT ,ET tires are actually 27.3" With the 3.91, thats actually the same gearing as a 4.56 gear and 32" tire.

With that 3800 stall and 3300# Im guessing 11.0s to 11.20,s
Posted By: S/ST 3040

Re: Indy Horsepower ! - 02/20/11 02:12 AM

I must expect too much out of everything.
Posted By: Sport440

Re: Indy Horsepower ! - 02/20/11 03:02 AM

Quote:

I must expect too much out of everything.



I think you are correct on its potential and its HP. I also think that you are used to well sorted out combos.

I just think tapping into that power band at a 3800 stall with a 3300# ride with that combo its not going to perform as well as it could. Its just my thoughts. I hope Im wrong
Posted By: Quicktree

Re: Indy Horsepower ! - 02/20/11 12:49 PM

Quote:

Quote:

I must expect too much out of everything.



I think you are correct on its potential and its HP. I also think that you are used to well sorted out combos.

I just think tapping into that power band at a 3800 stall with a 3300# ride with that combo its not going to perform as well as it could. Its just my thoughts. I hope Im wrong

I think the power will be there, wether it can be used is the question. it's going to take a good suspension to hook that 9" slick.
Posted By: Kiddart

Re: Indy Horsepower ! - 02/20/11 07:02 PM

If you guys are saying a low to mid 10 I must be missing something. I purchased a complete Indy motor 415 ci it has all the good stuff except for a full port on the heads it has a stage 1 port/matched gasketed intake and heads. Its a 3200 lb car from what I can figure, I run a cope 904 5000 stahl on a 28 x 10 slick, 456 rear gear best is 10.82.

Now I think i have been going wrong with the front of the car I have now a really good front end alignment and have taken about 30 lbs out of the car this winter. I want another 30 or 40 out buy spring.

So where am I going wrong and my sixtys are real good and consistant?? Not to hijack but not sure where I am going wrong.

but his motor is like my brothers setup and his is a 11.30 all day any day car very cosistant.

let me know what you think and your results
Posted By: Quicktree

Re: Indy Horsepower ! - 02/20/11 07:11 PM

Quote:

If you guys are saying a low to mid 10 I must be missing something. I purchased a complete Indy motor 415 ci it has all the good stuff except for a full port on the heads it has a stage 1 port/matched gasketed intake and heads. Its a 3200 lb car from what I can figure, I run a cope 904 5000 stahl on a 28 x 10 slick, 456 rear gear best is 10.82.

Now I think i have been going wrong with the front of the car I have now a really good front end alignment and have taken about 30 lbs out of the car this winter. I want another 30 or 40 out buy spring.

So where am I going wrong and my sixtys are real good and consistant?? Not to hijack but not sure where I am going wrong.

but his motor is like my brothers setup and his is a 11.30 all day any day car very cosistant.

let me know what you think and your results

it's all in the combination, I had my stock stroke 360 with indy heads in my sons 3250lb challenger bone stock suspension running 11.0s on a 2bbl carb. same motor runs 10.40s in my challenget at 3000lbs.
Posted By: sshemi

Re: Indy Horsepower ! - 02/20/11 07:42 PM

Quote:

If you guys are saying a low to mid 10 I must be missing something. I purchased a complete Indy motor 415 ci it has all the good stuff except for a full port on the heads it has a stage 1 port/matched gasketed intake and heads. Its a 3200 lb car from what I can figure, I run a cope 904 5000 stahl on a 28 x 10 slick, 456 rear gear best is 10.82.

Now I think i have been going wrong with the front of the car I have now a really good front end alignment and have taken about 30 lbs out of the car this winter. I want another 30 or 40 out buy spring.

So where am I going wrong and my sixtys are real good and consistant?? Not to hijack but not sure where I am going wrong.

but his motor is like my brothers setup and his is a 11.30 all day any day car very cosistant.

let me know what you think and your results



I would say you should pick up alot if you have the heads pro ported.
No presonal experience but the indy heads dont flow much out of the box.
Posted By: Just-a-dart

Re: Indy Horsepower ! - 02/20/11 08:23 PM

I ran a combo close to this for a few years (just changed) ran 4:10 gears. 4500/9.5 converter larger dot tires(13.5/29) 950 hp carb, 6.60s most nights at Irwindale 1/8th
Posted By: Wedgeman

Re: Indy Horsepower ! - 02/20/11 08:54 PM

Quote:

Quote:

If you guys are saying a low to mid 10 I must be missing something. I purchased a complete Indy motor 415 ci it has all the good stuff except for a full port on the heads it has a stage 1 port/matched gasketed intake and heads. Its a 3200 lb car from what I can figure, I run a cope 904 5000 stahl on a 28 x 10 slick, 456 rear gear best is 10.82.

Now I think i have been going wrong with the front of the car I have now a really good front end alignment and have taken about 30 lbs out of the car this winter. I want another 30 or 40 out buy spring.

So where am I going wrong and my sixtys are real good and consistant?? Not to hijack but not sure where I am going wrong.

but his motor is like my brothers setup and his is a 11.30 all day any day car very cosistant.

let me know what you think and your results



I would say you should pick up alot if you have the heads pro ported.
No presonal experience but the indy heads dont flow much out of the box.



I agree !! I had the heads on a flowbench to see how they would do in stock form, here are the numbers:

.100 ---
.200 77 cfm
.300 155 cfm
.400 222 cfm
.500 266 cfm
.600 279 cfm
.700 267 cfm

Flow a low lift really sucks, a race job will do big difference, the intake valve is way too close to the chamber wall to allow flow, like only half of the valve is working, it really needs to be open to get decent torque and flow at low lift,
Anyway, that is what I observed........

Ok ok !! I will get a higher stall converter loll

If I buy Caltrac, can I keep my brand new OEM leafs ?

Dan
Posted By: Quicktree

Re: Indy Horsepower ! - 02/20/11 09:16 PM

Quote:

Quote:

Quote:

If you guys are saying a low to mid 10 I must be missing something. I purchased a complete Indy motor 415 ci it has all the good stuff except for a full port on the heads it has a stage 1 port/matched gasketed intake and heads. Its a 3200 lb car from what I can figure, I run a cope 904 5000 stahl on a 28 x 10 slick, 456 rear gear best is 10.82.

Now I think i have been going wrong with the front of the car I have now a really good front end alignment and have taken about 30 lbs out of the car this winter. I want another 30 or 40 out buy spring.

So where am I going wrong and my sixtys are real good and consistant?? Not to hijack but not sure where I am going wrong.

but his motor is like my brothers setup and his is a 11.30 all day any day car very cosistant.

let me know what you think and your results



I would say you should pick up alot if you have the heads pro ported.
No presonal experience but the indy heads dont flow much out of the box.



I agree !! I had the heads on a flowbench to see how they would do in stock form, here are the numbers:

.100 ---
.200 77 cfm
.300 155 cfm
.400 222 cfm
.500 266 cfm
.600 279 cfm
.700 267 cfm

Flow a low lift really sucks, a race job will do big difference, the intake valve is way too close to the chamber wall to allow flow, like only half of the valve is working, it really needs to be open to get decent torque and flow at low lift,
Anyway, that is what I observed........

Ok ok !! I will get a higher stall converter loll

If I buy Caltrac, can I keep my brand new OEM leafs ?

Dan

here's the deal, if you are going to keep the small slick going with a higher stall converter will make it harder to hook the small tire I believe. I thought I read the heads had a race port job? no you need to go with caltrac spring. sell the oem springs, I would. and a good set of shocks will help.
Posted By: Just-a-dart

Re: Indy Horsepower ! - 02/20/11 09:48 PM

the Caltracs and good adjustable shocks will help a lot, the cal track monoleafs weight is less and they will work better.Also monoleafs will give you a ride height option (-1" works for me).Are you going to street drive at all, or track only?
Posted By: Wedgeman

Re: Indy Horsepower ! - 02/21/11 03:46 AM

I like to drive it in the week too when the weather is nice

My tought was on a bigger carb too....

Dan
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