That sounds like a really nice setup and good luck to you on getting it running, who knows I might run into you one day at Englishtown. Not sure if Wednesday is still street night there still. As for TA the guys like to argue and when he stated that single duration cams are not ideal for ported head I dug up an article from Isky on the topic that is on page four in this thread. That wasn't good enough for him nor did he add anything more to the conversation other then "no one runs single duration" in the LT1. If that is the level of expertise I will take his words with a grain of salt.

 

Interesting that you cite Smokey Yunick. Do you know what Smokey said about rod length?

Source: Performance Connecting Rods: Engine Builder

 

I did say that in this thread or another, but thanks for pointing out again that it only moves the torque curve up.
Yeah all 5-7 hp of it for $600-$800 worth of rods, I rather dump that into the valve train.

 

Crazy news, the car has made 412 rwhp. It also has an incredible flat torque curve through the rpm band. This was achieved with 1.94 valves and a $750 port job!
Guess what, it has room to grow if I add full roller rockers, 1 3/4" headers and a larger TB! This thing can easily hit 450 rwhp!
Great job Tony at headbytes.com!
The guys at the dyno shop were very surprised and said they would of never thought the cam choice would work this good, but guess what, it did! I will post a picture of the dyno sheet tomorrow.
Come forth you "nay" sayers!

 

Here it is =)

 

I was just gona ask for an update. Nice numbers! now get her to te track!

 

Something(???) is wrong with this dyno chart.

Any "ole" engineer/engine builder can tell you that the conversion factor between HP and TQ is 5,252. What this means to anyone looking at a dyno chart/graph is that the HP and TQ curves ......... must cross (i.e. be equal) at 5,252 RPM.

The above graph has HP equaling TQ at what looks to be approx. 5,800(?) RPM and that is just ...... wrong.

 

They won't cross @ 5252 rpm when the scales for HP [left] are different than the TQ [right]

That car won't just easily hit 450rwhp, it'll never hit 450rwhp.

I give it 2 out of 5 stars on my 'meh' rating. Marginally better than a CC306 with LE1 heads or GM847 with 185cc AI heads.

At least the TQ is flat, but I'd rather see some track times. Dyno sheets in racing matter like calf size in the UFC.

 

lol calf size. Yep a dyno is just a tool and can be helpful in comparing things but given everyone isnt using the same dyno its really tough to compare results. Given your going back to the same dyno you started on they can be awesome for showing an increase or decrease with other combinations. That is a good hp # but what I would like to see is either track times or a comparison on say a mustang dyno or a similar car with track times on that dyno. Any way you cut it I am sure your pretty stoked to have her running. How was the afr and tune? Was you tuning or just making #?


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As correctly stated by Bersaglieri.... any "ole" engineer knows that they must cross at 5,252RPM if both torque and HP use the same vertical scale. In this case they do not.

 

Good catch! The problem with being an "ole" engineer is that the eyesight is one of the first things to go.

 

Injuneer, and you do type faster than this "ole" engineer.

 

Let me see some dyno results with your claims. I looked at a lot of combinations and I know that LE1 heads will not come close to these numbers and AI and all the others I can only laugh at with their cookie cuter heads all running 56cc exhaust ports on a lt1. Guess that explains why everyone is going with split duration cams when using their $2k+ heads.
I am tempted however to take it to 450 now that you said that, all in good time. First I have to address the rear. I can assure you it will hit 450 but for now I am very happy with it.

I also found this on one of the forums;
LE1 cam pulls from 2000 to 6300 RPM and should make 370-390 RWHP with matching heads, 30 lb injectors, 52 TB, 1 3/4 LTs, No cats, good tuning, etc. The heads are ported using stock valves, performance valve job, back cut valves, CM 612 springs, retainers and locks, milling, cleaning and assembly. These heads flow about 255/180 with a 195 cc intake port and stock LT1's flow about 215/150 with a 170 cc intake port.

Heads and cam are $1100 (plus shipping) and will pass emissions with good tuning. This has the RPM range of the Hot Cam or CC 305 cam but makes more HP and TQ through out the entire RPM range. This will work
with any gear and converter but the track times will be better with a stall and some gear.

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LE2 cam pulls from 2200 to 6500 RPM and should make 400-420 RWHP with matching heads, 30-36 lb injectors, 52-58 mm TB, 1 3/4 LT's, no cats, GOOD tuning, etc. The heads are ported and machined for larger Ferrea 2.00/1.56 valves, Comp 987 dbl springs, TITANIUM 10 degree retainers, locks, locators, milling, cleaning and assembly. These will flow about 270/190 with a 205 cc intake port.

Heads and cam are $1600 (plus shipping) and will need GOOD tuning. This has the RPM range of the CC 306 cam but will make more HP and TQ at peak and across the board. The REAL difference will be the LE2 cam will make TQ in the 2500 RPM range and the cc 306 doesn't start until way past this. It will make more HP than the cc 306 at ALL RPM's.

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LE3 cam pulls from 2600 to 6800 RPM in a 350 (2300 to 6500 RPM in a 383) and should make 410 to 430 RWHP with matching heads, 36-42 lb injectors, 58 TB or mono blade, GOOD tuning, etc, etc, etc. These are the same heads from above but with Comp 977 springs instead of the 987's. These are stronger and will also need Comp R lifters to handle the spring pressure.

Heads and cam are $1700 (plus shipping) and will need GOOD tuning. This cam is similar to the GM 847 cam but makes about 10 more HP at peak and starts making HP sooner. Makes more HP and TQ across the board. Needs gear and converter to work well in a 350. Pretty much a racing cam for the 350 or a good street cam that will act like the LE2 in a 383.

Here is AI;
Stock 350 cid - 383 cid short blocks with piston relief/dish volumes of 5-16 cc. With supporting modifications, manual stock short block F and Y bodies will typically produce 395 - 435 rwhp SAE corrected or 415 - 455 rwhp STD corrected depending on cam and valve train selection. Purpose built 355-396's typically manage anywhere from 440 - 500rwhp SAE when utilizing our manifold work & valve train.
PRICE;
Cost: $1775 for labor, CNC work, and components listed above applied to your GM LT castings

Labor and Component Options:
Install K-Line Bronze Guide Liners & hone to ideal clearances - Cost: +$125
PSI .700"+ solid roller dual springs w/ Xceldyne Ti-17 Retainers & locks - Cost: +$695

So you see my heads is in the ballpark of LE3 and he is getting this with a TB which I don't even have yet or a full roller rocker set or 1 3/4" headers.

 

What cam are you running with the LE2 heads and what kind of numbers are you getting?
I like the numbers to and after much doubt installed in my mind here it was a very nice surprise =). Thanks!

 

Howard Cams uses 1.5 rockers for their cam specs, I am running 1.6's.