Anyone use a thumper cam? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sport/Truck · 02-26-2007, 08:40 PM

This cam has me curious and sounds like it would be lots of fun!
It’s a roller cam that can be retrofitted for our blocks. The kit is kind of pricy at ~$1000
http://www.thumprcams.com/ (has sound clips too).
It says it’s hated by neighbors, and envied by friends.

s/t

Sport/Truck · 02-26-2007, 10:46 PM

What do you’ all think about cams in general? Somebody that built a stoker (a long time ago) said he used a Comp cams 270H. he said it ran real good too.
How about the cam that offers the 4 & 7 swap?
s/t

*rage'nrat638* · 02-26-2007, 10:52 PM

here you go

thats whats in the 350 and 400 thats about as hot as you can go with the stock converter.and power brakes
that 1000.00 cams very pricey.. the 496 in the 85 now sounds like that or worse..lol

Sport/Truck · 02-26-2007, 11:36 PM

FWIW, that price was a complete set timing chain, roller lifters, springs, retainers etc.

boraxman · 02-27-2007, 01:31 AM

Speaking of cams, I found this Summit branded cam and lifter kit for $70
http://store.summitracing.com/partde...7&autoview=sku

This has the exact specs as the Edelbrock RPM cam kit that goes for $165
http://store.summitracing.com/partde...2&autoview=sku

Anyone try a Summit cam? Are they made by Edelbrock?

*EDIT* they are not idenical but pretty dam close.

muddyole 69 · 02-27-2007, 01:45 AM

Used several of them with no issues what so ever. (good price for a cam and no problems) I will definitely use em again my 2 cents Mike

stllookn · 02-27-2007, 02:06 AM

Just installed one in my small block 400 and broke it in on the new test stand...no problems so far after 30+ minutes of running between 1500 and 2500 rpm. No load yet but the price is right and they seem to work. It is all about lift, duration and separation angle...match that Comp Cam with a Summit and save some bucks.

68C15 · 02-27-2007, 08:34 AM

this cam talk reminds me of a recent article done by Hot Rod Magazine in their special engine issue. lots of good info in there. especially on the flat tappet issue.

rollers are the way to go. IMO

cableguy0 · 02-27-2007, 08:44 AM

neither summit nor edelbrock make there own cams. they are made by an outside supplier that makes all the "generic" cams. if you look at what available each company has a few cams that every single other company has an exact match of. these are basically reboxed cams. the edelbrock cams are over priced especially considering they are outdated grinds. the best flat tappet cams available right now are the lunati voodoo series. very aggressive cams make lots of power compared to similar flat tappets in the same range.thats not a bad price for a complete kit. the 4-7 swap cams have almost no benefit over a standard cam except lightening your wallet tremendously. any hp gains are in the 7000rpm range and most street motors will never see that ever and the gains are minimal at that

92306HO5 · 02-27-2007, 09:42 AM

cableguyo what lunati cam are you running?

Sport/Truck · 02-27-2007, 10:54 AM

Quote:

Originally Posted by cableguy0

neither summit nor edelbrock make there own cams. they are made by an outside supplier that makes all the "generic" cams. if you look at what available each company has a few cams that every single other company has an exact match of. these are basically reboxed cams. the edelbrock cams are over priced especially considering they are outdated grinds. the best flat tappet cams available right now are the lunati voodoo series. very aggressive cams make lots of power compared to similar flat tappets in the same range.thats not a bad price for a complete kit. the 4-7 swap cams have almost no benefit over a standard cam except lightening your wallet tremendously. any hp gains are in the 7000rpm range and most street motors will never see that ever and the gains are minimal at that

cableguy0 What’s your impression of the thumper? Your commit on the price referring to the thumper kit?

*Shane* · 02-27-2007, 11:49 AM

Can't say this is the case now, but at one time Comp Cams out of Memphis made the Summit cam's for them.

cableguy0 · 02-27-2007, 04:41 PM

the price comment was for the edelbrocks.i am actually running the generic .480 lift and 230@.050 duration cam and its a pbm cam. i ran the same cam that came from a lunati box but when i needed a replacement the pbm saved me a ton of money and havent had any issues. i have used the pbm stuff in a lot of engines with never an issue

02-26-2007, 08:40 PM	#1
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Anyone use a thumper cam? This cam has me curious and sounds like it would be lots of fun! It’s a roller cam that can be retrofitted for our blocks. The kit is kind of pricy at ~$1000 http://www.thumprcams.com/ (has sound clips too). It says it’s hated by neighbors, and envied by friends. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-26-2007, 10:46 PM	#2
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Anyone use a thumper cam? What do you’ all think about cams in general? Somebody that built a stoker (a long time ago) said he used a Comp cams 270H. he said it ran real good too. How about the cam that offers the 4 & 7 swap? s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-26-2007, 10:52 PM	#3
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Anyone use a thumper cam? here you go thats whats in the 350 and 400 thats about as hot as you can go with the stock converter.and power brakes that 1000.00 cams very pricey.. the 496 in the 85 now sounds like that or worse..lol Last edited by rage'nrat638; 07-12-2007 at 06:56 AM.

02-26-2007, 11:36 PM	#4
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Anyone use a thumper cam? FWIW, that price was a complete set timing chain, roller lifters, springs, retainers etc. __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-27-2007, 01:31 AM	#5
boraxman Keepin an eye out Join Date: Feb 2003 Location: So.Cal Posts: 3,921	Re: Anyone use a thumper cam? Speaking of cams, I found this Summit branded cam and lifter kit for $70 http://store.summitracing.com/partde...7&autoview=sku This has the exact specs as the Edelbrock RPM cam kit that goes for $165 http://store.summitracing.com/partde...2&autoview=sku Anyone try a Summit cam? Are they made by Edelbrock? EDIT they are not idenical but pretty dam close. __________________ 1970 Chevy C10 SWB 5.3 1996 Toyota Tacoma SR5 4x4 2007 Vespa GTS 250 Scooter ZIP 91351 Last edited by boraxman; 02-27-2007 at 01:35 AM.

02-27-2007, 01:45 AM	#6
muddyole 69 Senior Member Join Date: Jan 2004 Location: SE Ohio Posts: 1,121	Re: Anyone use a thumper cam? Used several of them with no issues what so ever. (good price for a cam and no problems) I will definitely use em again my 2 cents Mike __________________ hav'n fun be'n me

02-27-2007, 02:06 AM	#7
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Re: Anyone use a thumper cam? Just installed one in my small block 400 and broke it in on the new test stand...no problems so far after 30+ minutes of running between 1500 and 2500 rpm. No load yet but the price is right and they seem to work. It is all about lift, duration and separation angle...match that Comp Cam with a Summit and save some bucks. __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

02-27-2007, 08:34 AM	#8
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: Anyone use a thumper cam? this cam talk reminds me of a recent article done by Hot Rod Magazine in their special engine issue. lots of good info in there. especially on the flat tappet issue. rollers are the way to go. IMO

02-27-2007, 08:44 AM	#9
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Anyone use a thumper cam? neither summit nor edelbrock make there own cams. they are made by an outside supplier that makes all the "generic" cams. if you look at what available each company has a few cams that every single other company has an exact match of. these are basically reboxed cams. the edelbrock cams are over priced especially considering they are outdated grinds. the best flat tappet cams available right now are the lunati voodoo series. very aggressive cams make lots of power compared to similar flat tappets in the same range.thats not a bad price for a complete kit. the 4-7 swap cams have almost no benefit over a standard cam except lightening your wallet tremendously. any hp gains are in the 7000rpm range and most street motors will never see that ever and the gains are minimal at that __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

02-27-2007, 09:42 AM	#10
92306HO5 Registered User Join Date: Jan 2006 Location: ARIZONA Posts: 85	Re: Anyone use a thumper cam? cableguyo what lunati cam are you running?

02-27-2007, 11:49 AM	#12
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: Anyone use a thumper cam? Can't say this is the case now, but at one time Comp Cams out of Memphis made the Summit cam's for them.

02-27-2007, 04:41 PM	#13
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Anyone use a thumper cam? the price comment was for the edelbrocks.i am actually running the generic .480 lift and 230@.050 duration cam and its a pbm cam. i ran the same cam that came from a lunati box but when i needed a replacement the pbm saved me a ton of money and havent had any issues. i have used the pbm stuff in a lot of engines with never an issue __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.