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Double hump heads with a THUMPR cam ?

  
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Double hump heads with a THUMPR cam ?

 
tyler659 tyler659
Guru | Posts: 1710 | Joined: 05/09
Posted: 06/09/09
06:16 PM

i am looking to freshen up my 350 thats in my 74 el camino with th350(stock convertor) a set of re-built double hump heads (2.02 valves on craigslist for $350) and has an edelbrock intake and carb 600 cfm with headers and an x-pipe exhaust system and flowmasters ... i was wondering if i were to go with the THUMPR cam from comp would that be to BIG for my nearly stock setup up or should i go with a milder cam XE268 possibly let me know what you think or if you've got an input thanks  
tyler659

SMOKESHOW SMOKESHOW
Guru | Posts: 1001 | Joined: 09/08
Posted: 06/09/09
06:33 PM

Either should work fine, what type of psiton? Dish flat top? How do you plan on mounting your accessories?  Those heads you want now probably don't have any accessory holes drilled in them, so you will have to go bracket hunting.  Let's get back to your gears and converter...Ever make a decision about any of that stuff.  What Edelbrock intake?  What casting number on the doublehumps?  Did they put in hardened seats or just clean up old heads?  No hardened seats = leaded fuel only  Frown Either way you should use the springs recommended by comp for those cams, because the ramps are really fast on the XE cams.

What are your reasons behind either selection?  
Are you done with the XE262?  
If you want to sound bitchin the Thumpr will do a good job.  Either cam will do alright as long as you have 9:1 or better.  Either cam will like a looser converter, but we already knew that.  

tyler659 tyler659
Guru | Posts: 1710 | Joined: 05/09
Posted: 06/09/09
07:03 PM

so on the accessorie holes that means there is no bolt hole for the Alt. because that the olny one i need i guess ??? it has the stock pistons and on the intake its the performer and the carb is a 600 cfm i had the casting # somewhere but when i looked it up they were off a 65-66 corvette but other than that i dont know  
tyler659

SMOKESHOW SMOKESHOW
Guru | Posts: 1001 | Joined: 09/08
Posted: 06/10/09
12:30 PM

the heads have no holes in them for any bolts that you see screwed into your heads currently.  Do the heads have hardened seats?  The casting numbers are pretty important.

Do your due diligence and choose what ever makes the most sense.  You can over think and analyze over and over for free, but you can't put a price on practical knowledge.  

Take a serious look at what you want, and do it! Post your results, and if you have any snags along the way you know where to go.

Pick some heads and a cam and soup up your ride!!!  

SMOKESHOW SMOKESHOW
Guru | Posts: 1001 | Joined: 09/08
Posted: 06/10/09
12:34 PM

Look back at your E-teks and xe 268 a step above stock converter and some good exhaust...You will like it.  

tyler659 tyler659
Guru | Posts: 1710 | Joined: 05/09
Posted: 06/10/09
06:02 PM

i found a set of used sportsman II on ebay and for 400 that im gonna bid on they end on saturday and there is only 2 bids on them ...so you think with these sportsman heads u think XE268 over the thumper because i have a stock torque convertor  
tyler659

SMOKESHOW SMOKESHOW
Guru | Posts: 1001 | Joined: 09/08
Posted: 06/10/09
07:46 PM

you make the call, you have all the info...  Wink  

tyler659 tyler659
Guru | Posts: 1710 | Joined: 05/09
Posted: 06/10/09
09:11 PM

with my stock convertor and the thumper rpm range being 2000-5800 and my car being a daily driver is this a wise choice ? or is the XE268 more up my alley with the 1600-5800 but i do want  the "rough/tough" sounding idle  
tyler659

SMOKESHOW SMOKESHOW
Guru | Posts: 1001 | Joined: 09/08
Posted: 06/11/09
06:55 AM

Seriously, either of them will work. Both of them would like a little looser converter.  Judging on Idle sound alone I would put in the Thumpr.... But that's just me.  

zman123 zman123
Enthusiast | Posts: 531 | Joined: 06/08
Posted: 06/11/09
03:52 PM

I bought a set of Sportsman II heads a few years ago and put them on my 400 in my truck with a Comp 12-235-2 (Extreme Energy 4x4 cam) and a Performer intake with a Holley 670 along with 1.5/1 roller rockers and an MSD ignition it runs great and now all I do is put gas in it, no worries!  

tyler659 tyler659
Guru | Posts: 1710 | Joined: 05/09
Posted: 06/11/09
05:15 PM

ok the thumper it is : ) what do you thinks rocker arm wise stock stamped vs. AL roller tip  
tyler659

SMOKESHOW SMOKESHOW
Guru | Posts: 1001 | Joined: 09/08
Posted: 06/11/09
09:04 PM

ust use your stamped pieces and if you decide after your done to install roller rockers you can do it then  

tyler659 tyler659
Guru | Posts: 1710 | Joined: 05/09
Posted: 06/11/09
09:44 PM

yea i am dffinitly gonna go with the thumpr i want the MEAN sounding idle ,and if you are correct in saying that they will perform almost the same then its a no-brainer  
tyler659

zman123 zman123
Enthusiast | Posts: 531 | Joined: 06/08
Posted: 06/12/09
09:28 AM

Roller, all the way. The less friction in a motor the more torque and HP it can make at ANY RPM  

tyler659 tyler659
Guru | Posts: 1710 | Joined: 05/09
Posted: 06/12/09
01:09 PM

i am on a pretty limited budget as it is , with me buying a used set of sportsman II heads on ebay and i still gotta get gaskets and the cam and lifters ... its just not in my budget right now  
tyler659

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