Gents,

I have three extra motors and in the process of building another 225 SL6. What is the smallest lift cam and duration you can use and make 250HP, no nitrous, no turbo. Just 10 to 1 compression and the "Engine Builder" 1.7/1.4 valves and good porting. HP Peak at 5000 or lower if possible.

Thanks!

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Ted,
In my .02....I would think a minimum of 280 dur. and .500 lift, if your keeping it under 5000. That, plus a well-modified head.
I know others could be an authority on this....

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225 Cubic Inches of Iron-Head American Muscle

225 bored .040 /.100 off block, Schneider Cam 224@.050~ .480 lift - Stock valves, blended bowls, Offenhauser intake with 500 Edelbrock carb

Banjo's got it right on, it's going to take .5in lift with 280-300 duration. This is of course with a 1.5 rocker ratio, I would cut down on the duration with a 1.6 but keep the lift up. Make sure some good valve reliefs are cut into those pistons. Lots of headwork, including multi-angle grinds. The actual port and polish work I believe you could do personally for 250hp, and more than that you might want to consult a professional. Last is blending the intake with the head, which will be follwed off with a minimum of 400+ cfm carb.
There is a lot of things I wish I would've done better these being included. If you really want a screamer I would take my time and get my hands dirty like I am doing now (rod polishing). The head with some work can do it, but to get rpms I've learned it takes carb, intake, and cam. Good luck, shoot me a PM if you want to bounce more ideas.

Why do you want the "smallest lift cam."

What car/drivetrain will this go into?

Lou

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Home of Slant6-powered fun machines since 1988

Dart 270,

It will go into a 69 or if I can't find one a 70's two door.
904 automatic with a 8 3/4 rear.

Less wear and tear, more bullet proof for consistent runs and longevity.
This would be a street car with allot of strip time.

Is 200HP hitting the wall? and 250HP asking too much naturally aspirated?
Is 225HP more realistic?
Doctor Dodge came up with the HP.

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

I'd go with .450 lift for increased valvetrain stability and troublefree service. Also a RDP cam profile, say,

292in/280ex .440in/.465 ex lift at valves @ 1.5 rocker ratio, 242/230 @ 050, 112° LSA 108 ICA.

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

The main part of my question actually involved converter stall, although I didn't say it explicitly.

Anything over about 225 @ 0.050" duration will not be nice at low revs with a stock converter. Even 220 @ 0.050" could be bad if not set up properly.

I like Juan's profiles (maybe only 6-8 deg @ 0.050" split between int/exh), although I would feel fine with 0.480-0.500" lift in mixed driving. However, they will require bare minimum 2500 stall to work best. I wouldn't fool with anything under 2800, personally. With a modern converter, you'll hardly know the difference until you stand on it.

Lou

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Home of Slant6-powered fun machines since 1988

Dart270,

Who's converters do you recommend?
I know if you buy one for a V8 they do not react the same with a 6.
So numbers are always off unless the stall is listed specifically for a 6.
Are any available off the shelf that conform to your recommendation?
If you would please share a supplier and part number.

Thank you very much!

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Oh! I wasn't thinking about auto tranny... I was thinking A833 close ratio with a 3.23 minimum rear end ratio... 3.54 perhaps... or a 833OD with low 1st (like passonperformance builds) and a 3.81 rear end. Recurved dizzy, and PLENTY of head work. Maybe webbers ITB's

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

I would not buy an off-the-shelf converter, period.

I recently bought one from Midwest Convertors (search net) and it was dead on. Talked to them on the phone about my car and motor and stall spec. Around $400 shipped with custom small pilot (extra few $) and large input splines. 9.5" and 2800 stall on that motor. They can give you whatever stall you want. Slantzilla and others have also had great luck with them.

Other people have used Edge Racing and Continental in SoCal (actually, I had one successfully modded by Cont in 1999), and PTC in GA.

If you really are going to make 250 HP NA, and for a street/strip app, then I would recommend 3000-3400 stall. I got 20+ MPG with a 3600 converter and 250-270HP and it ran low/mid 14s.

Lou

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Home of Slant6-powered fun machines since 1988

Gentlemen,

This is excellent information.
Thank you for your time and sharing your experiences.
I will add this data to my engine build plan.

Thanks!

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG