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Author Topic:   Cam Q's and power guesses for the C
Greenstang
Gearhead

Posts: 908
From: its all a fog..
Registered: May 2001

posted 07-16-2001 01:18 AM     Click Here to See the Profile for Greenstang   Click Here to Email Greenstang     Edit/Delete Message   Reply w/Quote
Hey Guys,
Anyone want to guess at power figures for my upcoming cleveland build?
As thrown down by SteveW, the goal is more than 328 HP at the rear wheels (Hi Mel! )
(I have a feeeling I am far short, so don't pls. don;t be afraid to come out and call me an idiot )
motor basics and goals:
70 351C
99.8% street driven, 300-400 miles a week 200 of which are freeway miles.
Stock block, either at std. bore or .030 over
70 351C 4 barrel closed chamber big valve heads.
Shooting for 10.5-8:1 CR (flat-tops and decking the heads/block
1&3/4 or 1&7/8 headers
c-4 with a shift kit, heavey duty bands and clutches and an 11 inch 2200 RPM stall
3.55:1 in the rear
Steet-ability (SP) is a concern
single plane intake and 750 holley SP are also laying around...
Valve train will be suitably built...
I would like to stay with a solid flat tappet cam, as they fit in my budget(not to mention the new solid lifters and springs I have...)
the cam I have now specs at 235/245 @.050 280/290 total, .555/.565 lift...
the cam grinder when I was planning on running a 200 shot (and building it much more thouroughly) through it reccomended (SP) a cam that spec`d at 251/[email protected] and .628/.640 lift...
So; how much cam do I need to meet my power goals (if they are attainable at all)?
how much is streetable (I can live with barely streetable, I have thick skin)?
Questions? comments? concerns?
I certainly don't know it all, so the more info I have in front of me that better!
(Aplogies in advance for typo's, I if I see them later I will fix them, I ran out of time... right this second)
Thanks

------------------
Marcus
Audi R8-
The new definition of "The Unfair Advantage."

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MrXerox
Gearhead

Posts: 290
From: Oklahoma City, Oklahoma
Registered: Nov 2000

posted 07-16-2001 10:35 AM     Click Here to See the Profile for MrXerox   Click Here to Email MrXerox     Edit/Delete Message   Reply w/Quote
I suggest more stall and gear with a tall rear tire for the Cleveland and the Comp Cams 294S (32-239-4) woule be a better choice. Just my .02

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steve'66
Gearhead

Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-16-2001 01:08 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Marcus,

A 10" 3000-3500 converter would be better at the track, but will run warm and slip on the freeway. The comp 294s sounds good to me too. Should make good power and be streetable. The 3.55 gear is about all you'll be able to handle on the freeway w/o an o.d. All these compromises suck don't they,

SteveW

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kid vishus
Gearhead

Posts: 3894
From: middle of NC
Registered: Oct 2000

posted 07-16-2001 04:03 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I ran a cam real similar to the first one you listed when I first started.(237 int, 247 exh @ .050 w/ .550, .559 lift flat tappet) It worked real well on the street. I also ran a 10" convertor, but I ran a 4.11 gear. At 50 mph it turned about 2800 rpm. When I switched to an 8" convertor that stalled 4500, it turned 3500 at 50 mph. That was when I ran into transmission cooling problems. With a big cooler, I think I could have gotten away with the looser convertor if I had used an electric fan on the cooler, and used a deep trans pan.(The 10" convertor combo ran 12.teen's and was far from being optimized. I was young and dumb and had lots of stuff "wrong")

I think you will be suprisingly close to your goal. The motor I ran last yr, with unported 2v heads, flat tappet cam (256 in, 266 exh @.050) 10.4-1 compression, 1 7/8" headers. Was showing around 410 hp based on the times and weight of the car.

Comment:
My 4v heads really showed a significant gain when I put the bigger headers on.

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Greenstang
Gearhead

Posts: 908
From: its all a fog..
Registered: May 2001

posted 07-16-2001 04:12 PM     Click Here to See the Profile for Greenstang   Click Here to Email Greenstang     Edit/Delete Message   Reply w/Quote
Steve, compromises do suck!
and I agree, I wouldn't go lower than a 3.55 gear and still feel comfortable driving it long distances. The poor junker 289 in it now has a hard time with the 3.55's as it is...
I considered more stall, but like Steve pointed out, I am worried about sliiping and heat build up...
Rear tires are 225/60/15 and will stay there till I can afford some 16 inch wheels...
I'll have to look at the 294S specs...
Thanks guys

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Marcus
Audi R8-
The new definition of "The Unfair Advantage."

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Hans olsson
Gearhead

Posts: 249
From: Sweden
Registered: Apr 2000

posted 07-16-2001 04:29 PM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
Marcus the specs on our motor is 4v closed chamber heads,manley steel valves,boss 351 alu intake(unported),holley780vac,trw 2379f pistons, stock rods and crank. Hyd comp cam 260/[email protected] .427/.450 lift.Msd 7al ignition and billet dist. Ram air intake .Hooker super comp 2".C4 trans with 8" conv(5300slip rpm). 3480lbs Our rear wheel hp is 360(i think). Hope this helps you

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  • 71 Mach1 351c
  • E/SA 11.92-110
  • F/SA 12.04-110

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