Re: Mushroom tappet cam
[Re: SethJof]
#2231635
01/10/17 03:01 PM
01/10/17 03:01 PM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Call Jim at Racer Brown.
Damn near did one myself, but Jim had a lobe we could agree on with the mushroom lifter.
At this point, I wish I would have done it.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Mushroom tappet cam
[Re: SethJof]
#2231834
01/10/17 08:41 PM
01/10/17 08:41 PM
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Joined: Oct 2011
Posts: 559
Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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I have a used (very little used) Racer Brown STX-60 Mushroom camshaft 310 degrees @ .018" lift, 105 LSA. Net lift .620" I think it is 271/271 @ .050"
Timing at .018" lift......Intake opens at 52 BTDC, closes at 78 ABDC.......Exhaust opens at 82 BBDC and closes at 48 ATDC
This was probably ground in the 1970's and is a single bolt cam.
Oh yeah, the cam card says to avoid valve float and limit the cam to 8,000 rpm.
Last edited by LaRoy Engines; 01/10/17 11:26 PM.
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Re: Mushroom tappet cam
[Re: SethJof]
#2231910
01/10/17 10:39 PM
01/10/17 10:39 PM
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Joined: Apr 2006
Posts: 4,220
West Plains, MO
DrCharles
master
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master
Joined: Apr 2006
Posts: 4,220
West Plains, MO
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I have just fired up my 451 with the .654 mushroom (P3690588 Mini-Express). The car isn't street driveable yet (no windshield, head or taillights among other things) but it idles choppily at 1100-1200 with 6-7" of vacuum. The few people that have run them have nothing but positive reviews. Once you get above 3200, hang on and it'll pull as high as your heads and valvetrain will allow. Don't be scared off by the mushroom lifters, it's not hard to get them in and out using a half-pipe PVC or heavy cardboard through the cam tunnel. Also, you do not have to back-spotface the lifter bores as the old Direct Connection "bible" claims. Some say it may save you a broken lifter if you ever float the valves... but as the Racer Brown cam instructions say, don't do that.  I'm running Comp 953 dual springs with 140 seat, 430 open and once on the road/track will find out if that's enough spring. 
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Re: Mushroom tappet cam
[Re: DrCharles]
#2231969
01/10/17 11:51 PM
01/10/17 11:51 PM
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Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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I have just fired up my 451 with the .654 mushroom (P3690588 Mini-Express). The car isn't street driveable yet (no windshield, head or taillights among other things) but it idles choppily at 1100-1200 with 6-7" of vacuum. The few people that have run them have nothing but positive reviews. Once you get above 3200, hang on and it'll pull as high as your heads and valvetrain will allow. Don't be scared off by the mushroom lifters, it's not hard to get them in and out using a half-pipe PVC or heavy cardboard through the cam tunnel. Also, you do not have to back-spotface the lifter bores as the old Direct Connection "bible" claims. Some say it may save you a broken lifter if you ever float the valves... but as the Racer Brown cam instructions say, don't do that. I'm running Comp 953 dual springs with 140 seat, 430 open and once on the road/track will find out if that's enough spring. Glad you got it running. I think the mushroom lifter is often overlooked.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Mushroom tappet cam
[Re: Monte_Smith]
#2232321
01/11/17 03:58 PM
01/11/17 03:58 PM
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Joined: Dec 2013
Posts: 403
Romulus, MI
GTS340
mopar
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mopar
Joined: Dec 2013
Posts: 403
Romulus, MI
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Waiting for the "That's David Reher, he is a Chevy guy, whats he know about Mopars" comments from the gallery. LMFAO, brilliant statement....and unfortunately I've heard it before
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