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Old 11-25-2009, 04:12 PM
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How about a thumpr

Hi everyone well my 1980 Z28 is finally complete .350 .60 over 010 block 041 heads ported with 1.6 rollers from cat industries xe 268 forged bottom end 10:75-1 comp 4 speed with 3:42 rear end and a 800 cfm edelbrock carb sitting on a rpm manifold, had her dynoed 417hp@5600 rpm and 436ft lbs@3600,she runs like a charm I never expected her to have such good manners and boogie as well.she ran a 13.17@103mph which is more than I had hoped for.I have her set up for road racing more than the 1/4,polyurethane mounts front to back including the bodymounts 1 3/8 front swaybar and a 1 inch rear, edelbrock shocks all around.She's nice and tight.
So of course now that winter is coming I'm going to build my 17 year old daughter her dream car a 1981 Trans Am,go figure I must have done something right.I'm going to roughly go the same route as my Z but set it up a little more for highway cruising as she stands she has a stock L82 350 from a 81 corvette ,headers gm aluminum manifold quadrajet carb turbo 350from TCI with a 2500 stall and 3:08 posi with 4 wheel discs, my Question is would a thumpr cam do a good job or should I stick with a XE series for a cam I'm only looking for 250 -275 horse motor but she loves the lumpy idle,any suggestions
PS Thanks to all of you who helped me with my baby its great to be a part of a group who love the same passtime.

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Old 11-25-2009, 05:49 PM
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I think you have too much carb on your Z, but tisn`t my ride.
I wouldn`t run a thumper cam if you give it to me, there about sound and that`s it. The common comp cams 268H will give a 350 a lopey idle and it`s only got .218 duration. Go to the cam company`s site that you desire to purchase from and go over the list of there small block cams. They will tell you how it idles and if it matches your combo.
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Old 11-25-2009, 06:25 PM
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I've used the 270 magnum with good results.I've also used a Crane #113941.Both were in mild 350s and sounded lopey in gear and ran strong.
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Old 11-25-2009, 08:58 PM
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Thumpr cams are a joke they are made because of all the HS kids that want to sound cool and sound like they do a 1/4 mile in 10sec.

A thumpr cam is like a roll cage made out of exhaust tubing its just for looks!

Buy a real cam not a noisey stick lol.

Look at lunati cams around the 270-280 dur. I think youll like them.

They have a close LSA 108 that gives the chop in the idle the dur. helps but its mostly the LSA.
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Old 11-25-2009, 09:03 PM
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prove it

can you back up why you think these cams are a joke
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Old 11-25-2009, 09:17 PM
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Quote:
Originally Posted by sapsz28
can you back up why you think these cams are a joke
Simple, there is no reason for these cams to have the excessively long duration that the have on the exhaust lobe, it doesn't help power. The 10-16 more duration on the exhaust compared to the intake is just for SOUND and no other reason. Comp even admits to this.

If your only criteria is that the engine sound tougher than it really is, then by all means use one.
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Old 11-26-2009, 12:27 AM
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Quote:
Originally Posted by ericnova72
Simple, there is no reason for these cams to have the excessively long duration that the have on the exhaust lobe, it doesn't help power. The 10-16 more duration on the exhaust compared to the intake is just for SOUND and no other reason. Comp even admits to this.

exactly my point they are to much exhaust. Buy a smaller cam that performs far better and you will be happy with the sound. The 275 Bracketmaster II cam with 1.6 rockers is a nice pick. or a 292 if you have the converter and gears for it.
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Old 11-26-2009, 01:46 AM
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thumpr

Now I understand better. Thanks alot for the education boys
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