Hot Rod Forum : Hotrodders Bulletin Board

Hot Rod Forum : Hotrodders Bulletin Board (
-   Engine (
-   -   thumpr with stock heads? (

phanline6.6 12-30-2009 02:21 PM

thumpr with stock heads?
First time poster, long time reader. Like most people on here, I have somewhat of a small budget to work with. And like most people I love the sound of a nice choppy idle. And like probably more people than would like to admit, I have no intention of ever going to the dragstrip, hell the closest one is 100 miles away. So after much thought, I did the most logical thing in my mind to my 350 sbc powered 1980 Trans am to enhance my trips to town, and that was installing 4.10 gears. It will spin the tires as long as I want, and put a grin on my face when I accelerate to 50-60 m.p.h. as I'm hauling one of four of my kids to school, ball practice, dance class, etc. I don'.t care about horsepower, just want that cool idle. what has to be done to my stock 882 heads to run the small thumpr cam?

eloc431962 12-30-2009 02:33 PM

Welcome to the site :welcome: . What cams have you been looking at do you have any ideas yet? Myself i would'nt put any thumping cam in a basically stock engine with a few more upgrades. Like heads change the springs add a set of studs and guide plates have the heads check out a possible valve job. Are you running a automatic if so do you have a stall converter thats something you should consider also. Is you car carburetor ?JMO


phanline6.6 12-30-2009 02:41 PM

Its a 355, flat tops, performer intake, 670 Street Avenger, headers, th350, stock converter. I just want a nice choppy idle with not alot of additional work. I'm a dirt digger, not a drag racer :D

sam_bo3 12-30-2009 02:51 PM

Your not supposed to but I ran a comp 262xe with stock springs on a 73 stock smogger 350. With the steep ramp, the proper springs are a good idea especially with the constant high R's you turn with 4.10s. The stock heads should be good for 500 lift.

I looked up the 279thumpr and it calls for a 2000 stall. You might get by with a stock convertor because of your gears.

eloc431962 12-30-2009 03:18 PM


Originally Posted by phanline6.6
Its a 355, flat tops, performer intake, 670 Street Avenger, headers, th350, stock converter. I just want a nice choppy idle with not alot of additional work. I'm a dirt digger, not a drag racer :D

Well now your engine it's not stock :D . What i was getting at was when you go changing cams with stock heads if you go to radical you will eventually drop a valve / rocker arm keep jumping off just a few things that could happen. Thats why i would at least add some springs to the stock heads. It's just when you go changing things like this it throws everything off the geometry, I have been there to much spring not good either. I have seen people try to add big cams with nothing else to back it up and wind up spending more money then they even considered i am just trying to help a fellow rodder out. Maybe someone else will come on and explain it better then i can. But i hope you got my point. You got a good start with your 355 i would either do my heads up right or buy a good set of heads ready to go or leave alone till i had the funds to do it right so that i did'nt waste my engine. Sorry to ramble one it's just you have to have a good top end. I am sure though you can find a good sounding cam that will work for you . Just trying to help and maybe save you some trouble down the road. JMO.


phanline6.6 12-30-2009 03:29 PM

Thanks for the input, I really appreciate your time. I can change the springs, and the converter, just not interested in a lot of head work or different heads. Just want a nice choppy idle with minimal effort.

phanline6.6 12-30-2009 05:06 PM

any ideas? anybody?

eloc431962 12-30-2009 05:46 PM

Heres one that should work and give you a decent rumble, Should work fine with your stock 882s. crane 274H06 with 218-218 duration at .050 and .450 lift on a 106 lsa. Or you can look into the VooDoo 262 about the same cam as the crane about the same specs . Still gonna need at-least a 2500 stall IMO.


sam_bo3 12-30-2009 05:49 PM

the comp 268 is advertised as having a choppy idle. It is the high energy series so it doesn't have such steep ramps. Check out some vids on youtube and see if you find a cam you like the sound of that is stock head friendly (lower lift). Since you have the gears and convertor you might look into the "lift rule" circle track cams.

Summit also has some pretty good cams cheap.

duration will get you the lope but tight lsa gets you the pop corn sound 106-108. It can reduce the idle vacuum but build mid range. just for reference most stock cams have lsa of 112-114.

eloc431962 12-30-2009 06:11 PM

I had a friend that went with the comp 268 it's not very choppy not very noticeable at all IMO But you might like it dependes on how aggressive you want it to sound you can hear it but it just not to aggressive JMO. The crane and the voodoo cam i showed you are for a circle track engine which have certain limits they can go with lift and such. Either one should sound pretty aggressive. JMO


phanline6.6 12-30-2009 06:16 PM

How 'bout Summit K00172

eloc431962 12-30-2009 06:26 PM

Looks like it has pretty much the same specs as the other two cams i showed you. Don't see why it wouldn't work still gonna need a converter. Be nice if you could hear one i would do what Sam bo said search youtube listen to a few get a better idea anyway. I have never used a summit cam before.


phanline6.6 12-30-2009 06:42 PM

I know you guys dont wanna hear it, but on Youtube, I like the sound of a Thumpr.

eloc431962 12-30-2009 07:01 PM

Check this out the summit cam you showed me is the crane now. .


phanline6.6 12-30-2009 07:31 PM

thanks again Cole for your time, with only a .450 lift, I can just bolt on some vortecs when the time comes, right?

All times are GMT -6. The time now is 10:35 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.