[darkhorse50]

This winter im putting together a poor mans H/C/I swap. I have a tubular gt-40 intake and gt-40 heads that are getting ported. I have been doing some research on speed density builds, and I think I have just made myself more confused. I was almost content with just buying a steeda #19 cam, but know im second guessing that choice. I have read some good things about Crowers 15511 cam, but its pretty exspensive like $270ish, or I could be real cheap and just throw 1.7 rolers at it, but I hate to pull the motor out and not put a cam in while im there. I would like to hear anyones input on these choices or other alternative ideas?

[trueblue01]

How's throwing 1.7 "rollers" at it cheaper than a $270 cam (unless of course they are those cheap Chinese knock offs that self destruct and take your engine along for the ride)? I would have to think that a properly profiled cam that will play nice with the SD's vacumn wants and needs would be a better avenue overall.

[93mustank]

If you dont want the worry of sd why not do the mass air swap....then you can run any cam you want......

Doesnt take that much money to do....and only takes 30 min

[darkhorse50]

I meant just buying 1.7 rockers instead of buying a cam and rockers, thats what I mean by being cheaper. How do you convert to mass air in 30minutes. Are your talking about that jump harness, that ties into your speed density harness.? No one has any imput on either of those cams huh?

[88gtrag]

i am also interesred in sd improvements or is mass air the way to go?

[dr.gonzo!]

sd is actually faster stock to stock. untill you get to the whole cam issue

I found this on a diffrent web site

Here are 6 cams that should work with Speed Density N/A use.
Look at there application discriptions and match to your desired use.
The cams with the longer durations of course will exibit some small amount of lower end torque loss until the engine gets into the cam's rpm range as specified by the mfger.
This can be offset with higher stall convertor and/or lower rear gear ratios that allows the engine to get to the cam's range quicker.

SD compatable CAMS.
Crower 15510.
Crower 15511.
Comp. Cams #35-308-8 (266HR).
Comp. Cams #35-310-8 (270HR).
Crane #444211 (Power Max 2020).
Crane #444221 (Power Max 2030).

Notes; The Crower 15511 is about the longest duration that can be used and will degrade drivability somewhat but often can be tuned around if your willing to go to those lengths for performance.

Looking at cam cards; the intake opening and exhaust closing points are the indicators of overlap.
When you see an intake closeing spec ATDC and an exhaust closing BTDC, you are seeing negitive overlap such that no pump back should occurr. That should make the cam SD friendly.
Pay attention to the mfger's discription per your application and above all 'believe what they say' about the RPM range of the cam and the reccomended valve springs and rocker ratios to use.

Need a good Speed Density friendly cam - Corral Forums

[93mustank]

Well do you have upgraded springs? .....cheaper is not always better.

I would put springs on if I used 1.7's....

Used the 15511 before on SD and still had problems

Mass air is simple.....

Computer , air box, meter, pigtail and some wire...... very easy

[darkhorse50]

Oh I forgot to mention, I'm putting the trickflow spring upgrade package on the heads, I believe the springs claim to be good till 540lift.

93mustank, what do you mean by you had problems with the crower. did the car run without stalling

[darkhorse50]

Dr.Gonzo thanks for that info one the speed density friendly cams, I havent heard of some of those cam options before

[93mustank]

Alot of surging...wanted to die.... I have done three mass air swaps.... its easy and worth it.

[dr.gonzo!]

do you have any articals on how to do this? the ones I have read make it sound like a "30 pack" job

[93mustank]

Here you go
MAF - Mustang Mass Air Conversion - StangNet - The Mustang Network

[fogged306]

That does have some incorrect info in it. It says that to use a Cobra computer, you have to use a MAF calibrated for 24# injectors, which isn't true. All you need for the Cobra computer is the 24# injectors and any MAF calibrated to 19# injectors. The Cobra computer makes the correction internally.... that info isn't for you 93mustank, its for people who read that article and don't know that.

[1slo5.0]

Originally Posted by darkhorse50 This winter im putting together a poor mans H/C/I swap. I have a tubular gt-40 intake and gt-40 heads that are getting ported. I have been doing some research on speed density builds, and I think I have just made myself more confused. I was almost content with just buying a steeda #19 cam, but know im second guessing that choice. I have read some good things about Crowers 15511 cam, but its pretty exspensive like $270ish, or I could be real cheap and just throw 1.7 rolers at it, but I hate to pull the motor out and not put a cam in while im there. I would like to hear anyones input on these choices or other alternative ideas?

Why would you hate to pull the engine out and not put a cam in? A stock cam with 1.7 rockers will probably be faster and for sure have better driveability than the cams you mentioned. There are people making 300hp at the wheels with stock speed density cams.

[93mustank]

Originally Posted by fogged306 That does have some incorrect info in it. It says that to use a Cobra computer, you have to use a MAF calibrated for 24# injectors, which isn't true. All you need for the Cobra computer is the 24# injectors and any MAF calibrated to 19# injectors. The Cobra computer makes the correction internally.... that info isn't for you 93mustank, its for people who read that article and don't know that.

True...dont need to worry...not gettin close to a cobra computer....thats where I have followed the directions and completed 3 mass air swaps

[darkhorse50]

Darrell, I just figured that an after market cam would take better advantage of the ported gt40 heads compared to just using a stock cam with 1.7's. I just want to get the most power I can out of this setup.

[93mustank]

Originally Posted by darkhorse50 I just want to get the most power I can out of this setup.

uh oh....cant take it back....said the magical words

Custom cam time for you.....

Dont say your not going to......

[95StangMX]

thats what I was gonna say call jay allen and have him grind you a cam

[1slo5.0]

Originally Posted by darkhorse50 Darrell, I just figured that an after market cam would take better advantage of the ported gt40 heads compared to just using a stock cam with 1.7's. I just want to get the most power I can out of this setup.

The porting might be sending you in the wrong direction. Who is porting them. GT40 heads are easy to mess up if you don't have experience porting them. You can make heads flow worse with porting easier than you can make them flow better. The biggest gains in those heads come from the valve bowl area, not the ports themselves. Gasket matching or hogging the ports out is not going to help flow at all. The most economical thing you can do with those heads is have a good valve job done and spend that porting money on something else. Otherwise you are going to have $600+ in a set of factory cast iron heads that still aren't going to flow anywhere near an aftermarket aluminum head. You can find used Twisted Wedge heads in the $600-$900 range.

Do not under estimate the stock cam or the speed density system. Stock for stock the speed density cars run faster than the mass air cars. Factory Stock has run in the 11s with the stock cam and factory heads and intake. Others are making 300hp at the wheels with the stock cam. There is one guy on the Corral that is making 300hp at the wheels with GT40P heads and a stock cam. The link has been posted on here a couple times.

A good combination will make good power.

[darkhorse50]

A friend of the family is porting them. He puts together cigiratte boat motors for a living. I'm confident he knows what he is doing. I was going to have him grind the EGR bumps out and have them matched to the intake, and get them decked .0030 All im after is putting together a 285-300rwhp motor as economically as I can. I just figure that a cam like the steeda 19 would get me to those numbers much easier than just using a stock cam with 1.7's.