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Going to rework my distributor and start over. I rechecked my timing and things aren't right. Think it has a broken spring or something. Very inconsistent. I'll let you kno×what I find.

91 pump gas. Pump says contains no ethanol. Thanks

Good info. Thankss.

Idle screws are at 7/8 out now. Turning them out makes cruise richen up. Jetted down 4 sizes in front and still super rich at cruise and wot.

Already blocked the middle e hole. The others are .028 but I have 26s I'll put in. I think my timing is ok. 22 at idle. 34 WOT and 50 cruise. I can make the t slot restrictors I have blanks to drill. Thanks for the info. I'm learning.

Sorry. I meantt an additional 1/4 turn. They are at about 7/8 out. Initial timing is 22 and 34 total with 50 at cruise. When I richen the idle the cruise goes richer also.

Ifr are .032. yes the idle screws will richen the idle. I will work on the primary jets and pvcr. Idle will be easy. Thanks everone.

How do I lean out the cruise and richen the idle. Bought an afr gauge and the results surprised me. Reading 10.8 at WOT, 11.8 cruise and 15.0 at idle. Box stock proform 750 dp. 3 emulsion blocks all open. 74 an#80 jets. IABs .070 and hsab .028. So plugged the center emulsion other two are .028...

Your engine is very close to my old 340. Stock 340 long block with rpm intake, headers, 750 dp and mopar 280 474 cam. With 3.55s, 2400 stall and drag radials it ran 13.15 at 102 at 3550 lbs. Can't get that cam now, but a comp 280 magnum or 280 purple plus would work fine.

Had that cam in a 9 to 1 318 with stock 360 heads. It was a little soft on the bottom end with the stock converter but still ran 14.0 at 101 with 3.55 open rear at 3500 lbs. It should work great in a 10 to 1 340.

I went from home ported 2.02 j heads to cleaned up eddy's and gained nothing. If you go aluminum get the trick flow's or have the eddy ported..

I loved the one I had. Great street cam and ran strong.

That should be a sweet little engine with more pep than stock.

I see alot of reground roller cams on ebay. Several different grinds to choose from at a good price. I don't have any suggestions though.

I have a UTP thread master that is similar. Make sure you are centered well. If you are the guide alignment tool will come out easily. Make damn sure the coring bit is sharp and uniform or it will wonder. If you check these things it's not hard to use and does a good job. It is time consuming...

I think hughes calls for .080 to .095 preload on their lifters. Your at about .042. If 3/8 fine thread.

Even with a 700 lift cam I'd still go with the liberty. Cam will spend a hell of a lot more time at .600 and less than above .600.

What about a taller port with a raised roof and bowl and longer valves. Kind of like an ls port. You would need a special intake and longer pushrods.

I was wrong. Sbm after market rockers have no offset.

That sucks. I would sleeve it.

Are those big block rockers on a smallblock. I thought small block rockers the cups were all centered. I could be wrong.

Sorry but they could make 10 dollars off of every chevy intake and still surpass total money made of mopar intakes. I don't like it but it's a fact we have to live with.

Thanks everyone. Got some good ideas. I will start with the timing and move to the carb if needed.

Just pulled my 340 and set in the new 408. Engine runs well and is stout but I have a random miss at cruise rpm. About 3000. Same carb and distributor as the 340 which didn't do this. Initial is at 24 and 32 total and 50 with vacuum advance hooked up to timed port on carb. If I unhook the VA it...

I actually lowered my installed height to 1.625 for the springs I used coil bind was .950 so I had p)entry of room for my .550 lift solid cam. I will try to find the spring no.

I run a small solid from hughes. 237 242 at .050 lift is .537 .542 on a 107. In my 3500# dart with 915 heads, air gap, 750 holley, 3.55s and 2400 stall it ran 12.9 at 106. I was impressed. 340 9.5 comp. Wazoo

Don't worry about the weight thing for that mild build. My 340 has stock rods with arp bolts, steel factory crank, and the speed pro 2316s. Seen 7000 rpm for years.

Speed pro 2316f will give you about 9.7 with a .028 gasket. That piston is a stock replacement for 68 to 71 340.

Shouldn't be that hard. I've seen a ton of 10 sec. 340 cars. Just 22 less cubes.

Juse use the performer intake and holley carb. My teen ran better with th performer than the d4b. Rering and all new bearing if bores are good. Otherwise bore with new Pistons. Summit sells a 340 repo cam that's cheap and will work fine. That with headers and gasket matched and bowl blend 302s...