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Originally posted by Moneymaker:
I kinda like this one. 32-644-5 Comp. .589/.615 256/266 106 L/S.

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Yep

I have run that cam and it is a nice grind. I had it in a "street" motor (10.4-1 compression, 2v heads) that once transplanted in my race car ran consistent 10.70's.

As for shifting at 6200 with your 4v heads, they wont like it. Especailly in a more race oriented application. 6500 at least, 6800 would be even better, especailly with the above mentioned cam.
Those big ports dont offer any low rpm velocity and therefore dont make much power until they are over 6000. My current 4v headed race motor gets shifted at 7500 out of low, and 7200 out of second and it really likes it. If it had something other than stock rods I would shift it higher.

quote:

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Originally posted by kid vishus:
Yep

I have run that cam and it is a nice grind. I had it in a "street" motor (10.4-1 compression, 2v heads) that once transplanted in my race car ran consistent 10.70's.

As for shifting at 6200 with your 4v heads, they wont like it. Especailly in a more race oriented application. 6500 at least, 6800 would be even better, especailly with the above mentioned cam.
Those big ports dont offer any low rpm velocity and therefore dont make much power until they are over 6000. My current 4v headed race motor gets shifted at 7500 out of low, and 7200 out of second and it really likes it. If it had something other than stock rods I would shift it higher.

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tell me more about your 10.70 motor! and the setup all the way back... real interested to hear a positive number like that before I hit the track!

But here's the info.
It was a 351 clevleand punched .030, TRW domed pistons for the closed chamber heads on stock rods that had the normal prep work done(polished, shotpeened, ARP bolts, full floated wrist pins), used Moly rings from a race motor that didnt live very long, the solid cam from Comp mentioned above, an old Offey single plane intake, a 926 cfm BG alchy carb on top of a 2" spacer, Crower stainless rockers, 3/8" diameter .060 wall pushrods, Jomar stud girdle, 2v heads that were gasket matched with no pocket port work done to them(got them that way), stock sized cheap valves, full msd ignition and my Hooker super comp headers(1 7/8" primaries, 3 1/2" collectors) designed for the 4v heads running thru Borla 3 1/2" sportsman mufflers.
What made it run so hard was a combination of the good alchy carb, my 8" 6000 rpm convertor, and my 5.00 gear. I run a c4 with a pro-tree transbrake, I now have a 4.86 gear in the car (broke the 5.00 last season) 32x13.5W Hoosier slicks, ladder bar suspension with coilovers. I was 2 stepping it at 4500 rpm, shifting it at 7000 and going thru the lights about 7200. Best pass it made was a 10.52 @125 mph , floating the valves at the finish line in mine shaft quality air (my weather station was showing a corrected altitude of 1400 ft BELOW sea-level [40 degrees, no humidity, 15 mph tailwind], normal "good" air is around 2000 ft above).
Over the winter I ported the heads, installed good valves, 2.10 intakes and 1.65 exhuast, added a small roller cam I had laying around, changed intakes,(put an Aussie made Active intake on it), and it ran 10.40's with a cracked cylinder wall.

I still have that Comp cam, and it will eventually go back into a motor designated for the street in my '70 again. My definition of "street" is pretty loose (that cam, an 8" race convertor, 4.71 gear with a locker etc)

Whew ! That got long winded!!

MSD and mallory ignition, holley strip dominator (which I might swap out for that new TFC), 830 annual discharge holley fed by a cell runnin a holley blue to twin married regulators, trans is a C6 with 3500 converter and a stage 2 kit for the valve body.
Rear is a work of art! 9" HRW nod case big bearing, 4.86 gears, 35 spline detroit locker, mosier axles, housing reinforced.
well thats it! except for the other thousand dollars you spend in unmentionables.
That converter you're using, the compression and the transbrake are the hugest differences in our setups.

The motor I have now runs 10 oh's with the same convertor,trans and gear. It is a 4v headed motor with 11.5-1 compression, a Holley strip dominator intake, and a Crower flat tappet cam. The heads are open chamber units that have been shaved .050 to lower the chamber volumes to 67 cc's, I ported them and they flow pretty good, especailly on the exhuast side. Same rods and pistons as out of the 2v headed motor. One difference is that behind this motor the convertor flashes to 6400 rpm. I shift it out of low at 7500, and out of 2nd at 7200. That Holley intake is tuff to beat for the 4v heads.
A c4 will get you about another .3 in the qrtr and a looser convertor will help it move.

A good C4 trans, along with a 8" converter will be needed to optimize it off the bottle.

Nitrous is a good way to make a STREETABLE fast car. Tighter converters and reasonable compression ratios work just fine with the bottle. When race day comes, replace the 93 in the tank with race fuel, turn the valve, and it's time to rock.

Good Luck!