Sorry if this is posted but could not find

[L31MaxExpress]

It's pretty tough to get primitive EFI systems to work well with a choppy idle. If you want that sound, carb conversion s probably the path of least resistance.

Not hard at all if it is tuned hands on. I have made a 232/240 @ 0.050 on a 108 LSA roller behave like a stock truck with TBI. Cam was very similar to the Lunati Bootlegger that came out later that is 232/244 @ 0.050 on a 108 LSA. Would not have been able to tell the difference. 2,800 rpm converter got it moving right along with a 3.42 rear gear. It obviously was not a stock swirl port head engine, but that is why they make the smallest versions of the Bootlegger and Thumper, etc to use with stock like heads and compression ratios.

 

[RoyBob]

Thumper cams are the worst of all worlds, they are literally just for sound.

If you want a lopy idle and are already doing roller lifters and rockers, at least get a high-RPM cam to get something out of that terrible low RPM performance.

Or, If your just going for sound, unplug 1 spark plug wire when you want that performance idle, lol.

I will Need to dissagree That bthe thumper cams are not good I have done Several 350s with this Cam 12-600-4 with intake 670 Holley Street avenger carb a set of world heads 2600 Stall 700R4 trans And spanked several BBC Trucks

 

[RoyBob]

Correct I have installed many thumper cams and they will absolutely Make Power

 

[RoyBob]

What I would like to find out is what Long tube headers will fit the 350 Clearance no issues 1989 swb 2 wd
Not real concerned about price want good fit and Quality ..

 

[Scooterwrench]

I've never had any issues with Hedman's other than you have to break out the die grinder and smooth the welds at the ports and collectors. They used to do it at the factory but they've gotten lazy. There are a lot of fancier headers with space age coatings but I've not seen where they're any better on the street save the tri-y's,those work really good but you better look hard and dig deep to get those.

 

[GoToGuy]

Won't a radical lopey idle , play hell with idle vacuum and power brake function?

 

[Schurkey]

Won't a radical lopey idle , play hell with idle vacuum and power brake function?

Yes. The questions are
1. Sure a Thumpr can make power. How much MORE power AND DRIVEABILITY would you have if the cam was not sabotaged to create an artificially-horrible idle?
2. How bad can the idle get and not cause functional problems due to low idle vacuum?
3. How are the emissions police going to react to a vehicle that intentionally misfires at low rpm?
4. How much engine life/cylinder wall/ring wear/catalyst life are you willing to sacrifice in order to make the engine misfire at idle?

High-performance engines tend to idle poorly. This is not a desired trait, it's merely a by-product of a camshaft and cylinder-head porting/sizing optimized for higher-rpm use. Then guys decide that they don't need the high-rpm power band, but they still want their engine to "sound mean".

They'd be better-off to ground one plug wire (or disconnect one sequential port fuel injector) when they drive to the Dairy Queen to impress people they don't know and who do not care. Ground a different plug wire each time, to spread the excess cylinder-wall and ring wear evenly among the cylinders. But the catalyst is going to live a really hard life no matter which cylinder is deactivated.

Optimize the camshaft for the power band that the vehicle will be driven in; and for a pickup truck or SUV, that better be set up for lower-rpm power especially if the cylinder heads, intake system, and exhaust won't support high-rpm power.

 

[movietvet]

Agree with @GoToGuy and @Schurkey about.....WHY! If you have to go there, do it quietly and build a sleeper. Let it breathe quietly and wake up when needed. A few other ways to go and still have a capable performing truck. Plus, then you have the longevity of that very reliable engine.

 

[Scooterwrench]

Agree with @GoToGuy and @Schurkey about.....WHY! If you have to go there, do it quietly and build a sleeper. Let it breathe quietly and wake up when needed. A few other ways to go and still have a capable performing truck. Plus, then you have the longevity of that very reliable engine.

If you're gonna Rock-N-Roll you have to play the music loud.

Cams don't beat motors up,high compression and high revs do. Limit the compression to 10:1 and set the fuel shut off when the cam ends and that engine will last a long-long time.