24* vs 12* vs dr17*

[Mitch H]

Using Wallace calculator w/correction says my car is making about 1000hp running 5.15 @135. It shows 1200 would run 4.85 @ 145. I don't know how accurate that is.

I would expect your car to run right about there in my back yard, a little better at Cecil or MDIR, and a whole lot slower in goneracin's back yard.

[Inferno camaro]

Using Wallace calculator w/correction says my car is making about 1000hp running 5.15 @135. It shows 1200 would run 4.85 @ 145. I don't know how accurate that is.

[Mitch H]

I would say that in the real world, 1250hp should easily do the trick, maybe even 1200. Should be attainable with methanol through a good conventional head.

[Inferno camaro]

Yes 4.80's-4.90's is my goal. Faster would be great but being a bracket car I have to make it consistently down the track on local track prep. I thought about 12* but not only is it more $ for heads intake but would need new headers (just my luck my headers broke last season so spent $2800 on headers and would be useless if switching)
With that being said I've never said man I wish this thing was slower or had less power

[Mitch H]

IC, we have discussed a little bit about where you would like to go ET wise, but to be sure......you will be satisfied running high 4.90's in shit weather, right?

Also, how more more is it really to go with 9-12 degree heads over these 17-20 degree conventional heads? Obviously, if you will be happy running high 4's, you will get there with a good conventional head.

Another thing, and I have a serious problem in this regard......are you the kind of guy that will not be happy unless you squeeze everything out of a combo that there is to get? The answer to that should dictate whether you try a combo and see how it turns out, or pay a top builder to take your engine, and make a combo that does just that.

Drag racing sucks!

[Inferno camaro]

These are the flow numbers and they say these should work better on methanol than their 20's.

[Inferno camaro]

Called about the 17* heads and they say they are nearly impossible to get castings but recommends an AFR 3708 18* head. Say it takes the same pistons and intake as sr20 so assume my intake would work with spacers. 2.45 int and 1.88 exh valve. Have never ran AFR heads but seem to have good reviews.

[goneracin]

we have our own program that someone runs for us. yes, on gas. pistons are like 15.5 ish for the 17 degree. diamonds.

[Inferno camaro]

Do you have a program for the 20* heads or you have a guy you get them from? Assume that was on gas? What are the pistons that you have for the 17's ?

[goneracin]

As was mentioned, we tried some 17 degree heads, actually maybe the first ones in the country...lol. They were not good for us. I ran them on the same platform as our 20* stuff, same cam, same compression, same rocker manufacturer and ratio etc. They were heavy, and were down a significant amount to my 20*. Not from Frankenstein, but from a guy who ive had success with in the past with some 24*. If you do go down the 17* road, i have some pistons and valvetrain id sell you, as im done with the project. If they truly flow 565 from FED, they will make power. BTW, my last 20* 615 made 1250 with an APD 1250 carb FWIW. Same bracket combination as the rest of our stuff. I think my 20* stuff flows like 530-540 ish

[1Azgerman]

There is a thread over at DRR in regards to 20* heads albeit Brodix- Dart vs spread port design head interesting comments. One of our members Al Alguire is also in on the conversation maybe he will see this thread and comment!

Steve

[Jimmy Lauri]

One thing for sure with the Eddy 17 head is you wont have to use big time off set rockers.

[Inferno camaro]

That's what I was planning to do but couldn't find a builder that has much out there running on alky in the 20* stuff. Some say it should work but haven't found the builder that says oh I have that combo out there running good no problem. TRE is the only one that says they have several running alky and really works well. I've gotten really mixed reviews on TRE so not sure I want to go down that road. Really don't know what the heck I'm going to do.

[1Azgerman]

Inferno are you still thinking about the 20* heads and combo? Seems like the 20* combo is what a lot of sportsman engine builders are turning out with success. Even running on alcohol.

Steve

[Inferno camaro]

Well I messaged him and he said he has a set that are not good and didn't flow well. They were from different a porter so not apples to apples I guess. What I've read the dr17 has to be ported so I suppose the porter has a lot to do with it but I really have no clue.