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I wonder if that carb is “Legal” for the OP? How many cfm’s George?

Good call! That intake accels in the upper rpm range.

@George Jets

Now I know what my parents meant when they said they wish they could the. The clocks back to when I was just a baby/kid. My oldest is about to turn 30. My youngest recent joined the USAF. He’s no longer just a big boy! When they were small, they were a tough job but the best job to ever have.

A 9 month old! GOD bless!!!!! Thanks!

Compression ratio and cam specs please!!!! TIA

The one place I’d argue is that, where do you find a stock as delivered 340 from ‘71 & down with the high compression pistons till running around today in good shape? I think it’s a load of bologna because (IMO!) they all need to be rebuilt.

LOL, well, the cylinder heads being as they were for the day did t flow very well and the intake was OK and just fine for the daily driver duties it was designed to do but, WOW! Imagine what a LD-340 on top would have done with a better head. Alas….. the factory has to do things on the cheap...

100% correct! Mo-Power is better…. LOL Ye that’s a little bit of a spirited driver. Would this and… And this also be a tire size dependent issue? How do you calculate 40mph & 67mph w/3.73 gear? At what RPM & tire size. The OP didn’t give the tire size and you didn’t give the RPM @ which...

For certain! Find another engine builder. It’s NOT hard. Not at all, not one bit. He’s full of sh#%!!! Edelbrock has there “Power Package” using there parts. The 330 used in there testing using all of there parts made 417hp. I went to the Edelbrock web site and copied this below. All you need...

Reminds me of a guy I met a long while back that had the Arrow and a small block running low 9’s through exhaust manifolds. Car was crazy quick.

LMAO!!! :rofl: 501.54

Cam duration @050? This is a huge help to have that number

That’s possible. Here’s why…. Probably not likely, but cams can be ground with a smaller or larger base circle than what cam as stock. Even if it is ground on the proper diameter base circle, the new lifters can have a seat height difference. There was over .100 between my MP solid lifters and...

Yes No

I ran that same basic spec Thumper in my son’s 10-1, 360 in his ‘91 4spd pick up truck. It was good. I liked it. He loved it.

@RustyRatRod - Say it, SAY IT!!!!!

Say it Rob! SAY IT!!! .750 roller!!!!!

This cam? COMP Cams 21-600-5 COMP Cams Thumpr Hydraulic Flat Tappet Camshafts | Summit Racing

Yes but I’d run the RPM & ether bowl port the head or look at a set of new cylinder heads. The cylinder head can benefit from a little work. Valve job/bowl work. After that, an aluminum head may prove to be better and cheaper. You didn’t mention what size Thumper. Just the small one. The...

Unfortunately, that leaves only places like Hughesengines, AR engineering, FBO @ 4secondsflat.com, TTI & a few others places. When it comes to camshafts (and other major parts,) Chrysler isn’t the first one to be thought about. The hottest sellers are.

Comp can give you .904 specific lobes if you request them. This is not a problem. Seldom do I see a need to make an attempt and actually take max advantage of the larger diameter.

No, don’t be worried. Here’s why and what your going to do. After installing the cam, rotate the cam and check for a smooth rotation. If it is t smooth, fix the problem. Install each lifter one at a time heavily lubed in the oil you’re going to run. Check for the lifters ease in two motions...

I don’t know what I was thinking….

If the crank is using a neutral balance at the rear, the front can be ether zero or external balance. It’s up to the flex plate to keep the external balance or be set for a zero balance converter. My 5.9 is external balance. Stock balancer up front with a B&M flex plate for a neutral converter.

If you’re going to leave it an external balance engine, the stock one is fine for general performance. It’ll handle street strip duties just fine. If you’re internal balancing the engine, a Fluid damper is about the best there is. Also. TCI Rattler is excellent. You can get cheaper SFI...

IMO, once he takes a few steps in the general HP tune department, I’d suggest a track run and see what it does. Just for fun of course…

He don’t know anything about the cam but I as well suspected this. The previous owner could have slid something in. His cylinder psi report (something 99% here don’t know or do) is pretty low but also pretty equal across the board. I’m thinking this is a dead stock engine with bolt on parts...

Go here for the limited plate; FBO Ignition - Home of the HRR688

OK cool. Once you grab your dial back timing light, see where that initial is set at. You’ll probably find more power when you can advance the initial a good bit. For a small cost, A - FBO distributor timing limiting plate can be purchased and installed. This will allow maximum initial timing...