Racer Brown

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Top Banana Dart

Top Banana Dart

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Does anyone remember running the old racer brown cam STX 21,.560 lift 306 duration, any ideas how it would compare to a .557 solid purple shaft. I got one with some other parts and since it is in very good shape might try ii in my sons 360 Duster thanks
 
They are almost the same cam, except the purple shaft has the lobe separation spread two degrees, (110 instead of 108)so it will like a tad more compression. I have the DC4120655 for the 360 I'm putting in my duster. Probably not the cam I would use if I was buying one today, but I've had it forever, may as well use it.
I have also used the DC .528 in a friends 340, although it wasnt the cam I had recommended. I had pushed him to use the old crane 250/260 .560/580/08, but some knob told him it was too big and he lost his nerve. It (the DC 528) was a decent street cam, but a little small, but it was very close to the old Racer Brown ST 21. As far as that goes, IIRC(might have the wrong Racer Brown grind #) the ever popular DC 509, is just a re-pop of the old Racer Brown SSH10
 
Thats cool!

If you figure out how you did it let me know!
 
Thanks for the info, I was wondering about the centerline, probably wont be that much difference in perf. Car runs 11.85s to 11.90s now with the .557 and a 750 carb. Had the .509 in the purple dart in my avatar, ran 12.00 to 12.10 that thing seemed to rev like a chainsaw Thanks again.
 
Yea, I realized that when I looked at my post, only the ones with a bracket beside them were changed. Kind of a paint in the *** if you are inserting cam specs in a post.
 
Top Banana Dart said:
Thanks for the info, I was wondering about the centerline, probably wont be that much difference in perf. Car runs 11.85s to 11.90s now with the .557 and a 750 carb. Had the .509 in the purple dart in my avatar, ran 12.00 to 12.10 that thing seemed to rev like a chainsaw Thanks again.
Click to expand...
The nice thing about the .509 is all the BBs I have tried will take it without any machine work. Its a good bolt-in gain. Of course, nowadays these motors are so old, you are always doing a ground-up engine, but back in the eighties, you could buy a BB car and plug a 509 & a set of hemi springs in, you were good to go. What are you running in the rest of the combo? compression ratio, heads, converter, gears, ect.?
 
Just realized I read your original post wrong. My answer implies that the SXT21 has the wider lobe centers & so would want more compression. Its the other way round, the DC 557 has the wider lobe centers, so the DC cam would want a little more compression. I never ran one myself, but I know other guys that ran the STX21 (And the bigger STX22 as well) it ran real good. I knew a local guy that ran a '66 Valiant with a near stock 340, reversed flat-tops, stock X heads, an LD340 with the divider milled and a 2" spacer, 750dp,9" converter and 4.88s ran solid mid elevens. By the way, on the same car I screwed an untouched 850dp on it, immediately picked up a solid, repeatable tenth.
 
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