Harold,

Among the million other requests, I'd like to get your thoughts on a solid roller cam for the below SBC:

Dart Iron Eagle block - 9.325" deck
4.155" Bore
4.125" Stroke Callies Crank
6.125" Oliver Billet rods
13.5:1 JE Pistons
Brodix 18SPX Heads
Brodix/HVH 1809 intake - plenum blended/port matched
2" Lemons Headers, 3-1/2" exhaust with Straightline mufflers.
TH350
8" ATI MRT Treemaster converter ~5500 RPM stall (will be adjusted as need for combo)
4.10 gears
28x10.5 M/T ET Drags
3500-3600 lbs with driver.

Heads go 260/216@.400, 303/233@.500, 327/240@.600, 332/245@.700, 330/248@.800. Exhaust flow numbers were WITHOUT a pipe. Should be 20-25 cfm higher with a pipe. Flow numbers were measured on Reher-Morrisons - SF600.

Looking to go 9's on motor. Expecting to peak power to be in the 7000-7200 RPM Range.

Ill be looking foreward to this one.. :D

Hmmmm,
A hard one.....

Greg Godon, 'Rocket Science' on www.RealOldsPower.com, (http://www.RealOldsPower.com,) has a 3550 lb 384 cid Olds, and he runs 9.90s, N/A.
Here's his cam:
312/321 at .020, 280/288 at .050, 201/206 at .200, .4567/.4544 lobe lift, 108 LSA. I'd use 1.6s straight across for .731/.727 valve lift, and as usual, put the cam in about 102 ICL....
In my 406 S/G cars running this cam, they generally report 225 or more 9-sec passes per set of valve springs.
You will of course need a small base circle cam.

UDHarold

Thanks Harold!

Fortunately, I should be able to get by on a std. base circle cam(I hope) as I have a raised cam (.391") block.

I've still got a little ways to go, but I'll be sure to let everyone know where this thing "tips the scales" on the dyno and then the track.

Harold..
Those ramps look similar to the "REED" PS-R series but the PS-R series have higher final lobe lifts at .481 and .483 .
REED PR-R Lobes (http://www.reedcams.com/Cat/Solid_roller_profiles.htm#Anchor-PS-R-58521)
What do you think of those lobes? Too violent on the springs? Do you think that Jason could achieve his goals with a less agressive ramp like those on the Reed SRA lobes?

Tony,

How is your project coming along? Making any winter changes?

Hoffbug,

Why, thank YOU!

I designed the Reed PR-R lobes in 1976, finishing up a long-term agreement I had with John. Cams such as their famous R296-02ULX family, the TRs, the SRs(Not the SRAs--John did those with a program I sold him), a lot of solids, Reed was my 1st major customer for cam design, starting in Dec 1972......
I'm happy to see some of them being sold for Pro-Stock/Pro-Mod engines. The only problem with Jason using ANY cam of .480 lobe lift is that he is going to need about a .850 BCD with his stroke. There are no cores made that will put a .480 core on a .850 BCD. He needs a Rocket Block or a 50mm with raised cam location, so he can get away from the small base circle, IF he wants to run very high lobe lifts. That is why I mentioned the 1.6 rockers.
The 312 shares the identical positive acceleration curve of the 302, which on another thread I mentioned going 8 hours, 15 minutes, turning up to 8500, behind a 5-speed. The 321 turns 9400 with ease, and is much easier on the valve train than the 312.
One set of springs should last all year or so, unless he is prone to 11,000-RPM mistakes.....

UDHarold

Thanks Harold..

Jason... I never had a chance to run the car last year. I went through a divorce and moved to a new home... Im garageless till spring :(
Hopefully this summer I can pick up where I left off last year.

Hey Jason, you might want to also call Scott Brown at Straightline. He's doing cams now and seems to know what will et. I'm also gonna call him before making any final decisions. His cam picked my buddy's Challenger up .2 and 2mph over his previous grind. He does mainly mopar stuff but I'm pretty sure he has an idea about sbc's given the similarities between small mopar and chevy. Just a thought.

As usual, glad to see it coming along Jason graemlins/thumbsup.gif

Any reason for sticking to 13.5:1 and not going any higher?

Adam,

A couple of reasons on the compression. One is to use an off the shelf piston with a small 1cc dome.

Also, I don't feel there is a significant amount of power to be gained to have a combo that is VERY finiky in regard to timing and jetting. After all, I am going to drive this thing in the street :D

I also will eventually be throwing a bit of N2O into the mix. That's WAY down the road though.

Still a ways off on this deal, but it is slowly progressing. I plan on getting the cam here pretty quick and headers after that. As soon as I get the headers, I will drop the block, heads, intake, carb, and headers in for a fit check and to measure for an oil pan. Things are going to be tight up top even with a 4" cowl hood. The new intake is over 8" tall not including the carb.

I'll post some pictures as it progresses.

Harold,

You may have missed it the first go round, but I do have a raised cam block. The Dart Iron Eagle is basically the same as a Rocket block. It is 9.325" deck, spread pan rails, and raised cam.

Would you change your recommendation any given that?

Thanks,

??