[shaker455]

Sorry Just your bore size?

I see you gave me the rest...for now I'll guess you .030" over and use those numbers

and I have you flow info

[loren]

sorry about that it's .030 over Thanks Loren

[Formula8]

Desktop dyno is a great tool but needs to be used precisely for best results.

For example, induction flow is not neccessarily equal to carb CFM. It is a measurement of everything from the cylinder head's intake port to the air cleaner. This number becomes more important with larger displacement engines. Jim Hand's book contains some measurements of the percentage losses involved with particular intake manifolds.

Also, the compression calculator is pretty slick but you need to know many specifications to get it right other than to just plug in 10.5:1 or whatever.

My biggest issue is the lifter type menue which extrapolates the shape of the cam lobe based on assumptions made about the type of cam selected. With cams like comp's XE series and Ultradyne around, can the lift rate on those be assumed to be the same as those used on the O41 cam??

What I would like to see with these vendor's who make recommendations and sell all of these cams, step to the plate and put these cams under the dial indicator and give us cam specs every .050 and host them on this site in a data base. Everyone would be able to compare and make decisions based on complete information.

[shaker455]

Macho t/a,

Here's your results!...I like it!

Pk flywheel Hp and Tq using headers & open exhaust

Hp 532@6000
Tq 534@4500

Here' the the whole scale from every 500 rpm from 1500-6500

107 373
159 418
203 426
334 501
401 527
457 534
502 527
529 505

[455earlybird]

Shaker455
My cam is a comp cam that Jeff Kaufman is turning to 230/240 @.500 with a 112 degree lobe seperation it is a custom grind so I can't find other info but it should come with the cam. The cam seems to be right between a xr276hr and a wr288hr but as I said the lobe seperation is 112 unlike these other cams. I just don't have it right now I was hoping to have it any day. Also my engine is bored .030 over to make it a 462 approx. My flow at each .100 of lift are as follows intake 93@100 165@200 210@300 242@400 265@500 And 267@600 the exhaust side flows 59@100 130@200 158@300 180@400 195@500 and 200@600 Hope this is enough info

[shaker455]

Oops...clicked too early

532 466
504 408

[shaker455]

Formula8,
Yes I know what your saying, I have 2 dyno programs, Dyno sim and engine anaylzer, they serve as a goo reffreance not as an exact number.

Okay 455early your next

[loren]

thanks alot thats pretty kool the guy that I copied off of had his on a dyno and said it had 476 hp 529 tq but he had 1.5 rockers and just street ported heads. so sounds good to me know that 175 shot nos I got should be plenty for a street car. Again thanks alot good people are hard to come buy but seem to be alot on this forum.

[455earlybird]

Sorry about the long user name I had signed up earlier as earlybird but then later when I went to log on there were pasword problem so I had to change my name. Thanks for all your help. Have a great holiday. By the way how do you put a picture of your vehicle on the forum and the other info under a responce I'm somewhat computer iliterate or if I spelled the word wrong maybe im just (owell I can't spell the word).

[shaker455]

455earlybird,

The flow # are good but I need more info...sorry

whats the lift on the cam and the intake centerline?...comp is usally 106

And you first posted 230/236 then you posted 230/240?...is 230/240 right?

[shaker455]

455earlybird,

I used 230/[email protected] 106 ICL .520/.540 lift from the XR-288 as I didn't know yours yet but I wiil change it when I get that info so here what I have so far:

Pk flywheel Hp& Tq lg tube headers and open exhaust:

Hp 508@5500
Tq 544@4500

[shaker455]

what # heads do you have?

[455earlybird]

No the cam is a 230/236 as first stated but this is all the info I have and I don't know if you can asume it would be right between the two stock cams or not because I know the lobe seperation is different. I don't know a lot about cams but am trusting Jeff I think he does a good job and it seems he had enough info on the rest of my engine to make a educated dissision on the cam selection. If any of you have any input it would be appreciated. What im after is a car that will be quite streetable have a moderate stall run on pump gas and run in the 12's hopefully on street tires right now I have a 8.2 3.55 Eaton posi behind a turbo 400 So I don,t want to really hook up and break stuff. Any advise on a stall speed I think Jeff said about 2400 what about tires I wanted something retro like Radial T/A's or Qualifiers (thats what I have now only 255/60-14s)but they spin bade with 275hp I should have a bit more next summer with the 455. I just bought some rally 2's (15" *8's for the rear and 15" * 7's for the front) so I need a different size tire selection I was thinking of 275/50-15's in the rear and 225/60-15's in the front What about adjustable traction bars anyone know of good ones.

[455earlybird]

The heads are # 46's but have been changed to large valves 2.11 and 1.77 and are fully ported nothing like the stock head. I dont believe my cam is the same as a xr288 I guess we should assume it between a xr276 and a xr288 Sorry about the confussion it is a 230/236 with a 112 degree lobe seperation

[455earlybird]

Shaker
I just found the lift info it is .510/.520 with the 1.5 rockers

[shaker455]

I know Jeff K personally ...you can't get a much better pontiac guy.

A 2500 stall would be fine, I have 255/60/15" all around on rallyII's

What about your lift?

1.5 rockers?

Your now @
Hp 502@5500
Tq 541@4000

[shaker455]

Okay,
You at w/.510/.520 lift 230/236
Hp 497@5500
Tq 539@4000

[455earlybird]

Thanks for the info what type of rubber are your 255/60-15's what kind of car and what kind of times do you run with it. Have a great T-Day and again thanks for taking time from your holiday to run my numbers. I hope I can get answers to some of my other issues. Sorry I don't have much input to offer I'm just learning about this stuff myself.

[shaker455]

Your welcome and Happy T day to you!

I have a white with blue stripe 71 T/A 455HO

#197 HO Heads ported & flowed 260/[email protected] ferra RAIV length stainless valves crossover filled, Crane hyd roller 242/[email protected] w.558 lift, RPM intake polished and exhaust crossover removed & Modified Qjet all by me. also Demon 850, Hooker super comps 2" tubes 3-1/2" collectors, 3" exhaust, turbo 400, 3.31 grears, stock stall converter to be replced by 2500 stall over the winter.
Times at drags reflect stock converter in 60ft times.

60ft 2.200
13.0 @ 110mph

[455earlybird]

Mine is a 67 f-bird 400 clone had a small block Chevy but I am attempting to repair this major malfunction with this 455 setup The car was originally Mariner blue and now is a green that appears blue at times Like I said it nas a 3.55 posi and will have a turbo 400 I am building to go behind the 455 I would also like to make the hood work as a passive type ram air (no solonoids just open at all times) will need to figure a way to get home when I get stuck out in the rain though as this is a street driven car will not attempt to drive in bad weather but around here you never know. I also will have height problems with the 400 hood and a RPM manifold in getting room for the ram air setup don't know if there's a way might look into an aftermarket tall 400 hood. I know the rpm will fit I have seen it done but not with ram air.