Camshaft opinions please: a bit long
#2407032
11/21/17 09:36 PM
11/21/17 09:36 PM
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Joined: Jan 2007
Posts: 2,212 Minnesota
peabodyracing
OP
top fuel
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OP
top fuel
Joined: Jan 2007
Posts: 2,212
Minnesota
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Roughly 20 yrs ago I spent some time with a local speed shop owner looking to purchase a then newer technology camshaft for my old gasser which I'd been running as a bracket car since the early 70's.
For all those years prior I'd been running a solid lifter Lunati with a ton of duration.
The speed shop owner steered me toward a Lazer cam, saying he'd had good luck with the company, which was apparently a newer start up at the time. I'd filled out a rather lengthy input sheet and a few weeks later had a new cam with solid lifters.
Anyway, the cam got installed and broken in, but then for a whole host of reasons I ended up storing the car without ever running it outside of the driveway.
Over the past year I've been working to get it going again. Time to relive my youth I guess.
Which brings me to this request for opinions:
Cam specs: Duration @ .050 261 (both intake and exhaust) Seat duration @ .020 295 (both intake and exhaust) Lobe separation 108 Gross valve lift 552 (both intake and exhaust) Valve lash hot .026/.028 intake/exhaust
Car weights 3400 pds. 426 wedge with stock 906 heads, 12.5 TRW's, 750 Holley on Torker intake, 727 with 3400 stall, 4:56 gears. Everything on the car is old school.
What do you think of the cam recommended to me? In retrospect I had always been under the impression it was beneficial to run a bit more duration on the exhaust side.
Not looking to run against SS/A cars, just hoping for a solid bracket car which will likely only hit the track 3-4 times a season.
Am I wasting my time? Headed for frustration? Thanks in advance for your thoughts and wisdom!
Lead, follow or get the hell out of the way
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Re: Camshaft opinions please: a bit long
[Re: peabodyracing]
#2407043
11/21/17 09:47 PM
11/21/17 09:47 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'm not a fan of dual pattern cams. Run it.
It's a little low on lift for me but nothing wrong with it.
Edit: you probably need more converter.
Last edited by madscientist; 11/21/17 09:48 PM.
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: Camshaft opinions please: a bit long
[Re: peabodyracing]
#2407052
11/21/17 10:03 PM
11/21/17 10:03 PM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Go run the car the car the way it is now and then, if you don't like it, change it later You could always tighten up the lash to see if the motor wants more duration and lift or not
Last edited by Cab_Burge; 11/22/17 01:34 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Camshaft opinions please: a bit long
[Re: peabodyracing]
#2407059
11/21/17 10:08 PM
11/21/17 10:08 PM
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Joined: Nov 2011
Posts: 284 PA
Harry's Taxi 2
enthusiast
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enthusiast
Joined: Nov 2011
Posts: 284
PA
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Just out of curiosity, what were the specs on your old Lunati cam?
'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.
NOS-used when losing since 1940.
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Re: Camshaft opinions please: a bit long
[Re: peabodyracing]
#2407124
11/22/17 12:13 AM
11/22/17 12:13 AM
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Joined: Jan 2003
Posts: 9,963 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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master
Joined: Jan 2003
Posts: 9,963
Frostbitefalls MN (Rocky&Bullw...
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I agree on trying less lash. I would start by tightening the exhaust by .010 to .012 to see if it likes it. The converter is a bit tight, but the cam isn't so radical it won't work ok. I wonder how this cam would respond to Beehive springs and higher ratio rockers, just a thought. If you have old super stock rockers, some were short on the stated 1.5 ratio I believe, might as well check them and see.
Last edited by gregsdart; 11/22/17 12:14 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Camshaft opinions please: a bit long
[Re: peabodyracing]
#2407352
11/22/17 01:52 PM
11/22/17 01:52 PM
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Joined: Jan 2003
Posts: 14,479 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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If it hasn't been run yet, or tested to see what the converter flashes to, then the "3400 stall" really means nothing.
That being said its probably going to want more like 4500-5000 flash stall.
The old Torker definitely leaves some power on the table.
There are a couple of Holley SD intakes for sale in the Moparts Engines section, I think an M1 single plane too. Either of those will be an improvement in power.
However, if you really only have something like 3400 flash stall now, and you don't plan on changing it, keep the original Torker..... They have better bottom end than either the SD or M1.
The cam seems okay to me. I'd start out at the recommended lash first, then you can try tightening it up a little at a time if it seems like the motor is responding favorably to it.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Camshaft opinions please: a bit long
[Re: Harry's Taxi 2]
#2407553
11/22/17 08:39 PM
11/22/17 08:39 PM
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Joined: Jan 2007
Posts: 2,212 Minnesota
peabodyracing
OP
top fuel
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OP
top fuel
Joined: Jan 2007
Posts: 2,212
Minnesota
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Just out of curiosity, what were the specs on your old Lunati cam? The Lunati was 520 lift and 320 duration on both sides. I always felt it was a little sluggish at launch, but it had a great top end charge. Thanks everyone for the great input. Having read through all the good suggestions I realize I've probably been over thinking this and need to get back to the basics. Gotta get new valve springs ordered as I've concluded I don't want to push my luck with springs that have been in the car for 30+ years. It's only November and I'm already thinking spring can't get here soon enough.
Lead, follow or get the hell out of the way
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Re: Camshaft opinions please: a bit long
[Re: peabodyracing]
#2407636
11/23/17 12:05 AM
11/23/17 12:05 AM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Little low on lift, but your heads should make that okay, as a stock port isn’t going to do much with any lift past .550 anyways. Run it and have fun. Great to hear you’re getting an old friend back out for some fun.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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