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This is a plug I just installed and removed after a test run. Test drive was about 16 miles at highway speed (60) and 4 wot runs through all three gears. Engine is a 408 10 to 1 comp. Solid cam 254 260 at .050 .565. .570 lift. Home ported speedmaster heads. 4500 stall 3.91 gears. Looks lean to...

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...

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've heard sbc +.050 and sbc +.100. What is actual length in inches. Thanks.

Why is it so easy to make a sbc head with a 200cc intake port. But seams impossible for a sbm. I know they are of different design but it doesn't seem that different.

Why am I blowing bypass hoses. Blown up two in a week. Only thing changed is new belt. Anyone else have this problem. I think belt was slipping before, but this still shouldn't be a problem. Thanks.

I just received my speed pro full groove main bearings for my 340. Why are 2 shells groove less. The picture in summit shows this also. The are listed as full groove.

Can I use a stock hydraulic rocker shaft with 273 mech. rockers if I ad the hole for pushrod oiling. I've seen some with 2 holes.

OK. How many cc's will i lose milling my 915 heads .050.

I have a 340 in my dart. It has home ported speedmaster heads with 2316 pistons with 9.86 comp. and .035 quinch. Cam is hughes solid 237 and 242 at .050 and .537-.543 lift on a 107. Induction is eddy street tunnel ram and 2 69 340 avs carbs. Anyway, I always run 91 octane but cant buy it in my...

I have a 68 dart with a 340 in it. Is it typical for the engine mount studs to bottom out in the k-frame slots. Mine does and it preloads the mounts and they eventually sheer. I believe everything is right as far as the mounts go. Car was a 318 car form the factory. Thanks.

I want to freshen my 340 soon. It has the 10.5 to 1 forged replacement pistons at 4.070. I cant find a file fit ring for this in a 5/64 thickness. I can find a 4.078 ring. Can I file fit the 4.078 or is this to much difference. Thanks.

Changed my combo up. New combo is .030 over 340,2316 pistons, 2.02 ported j heads,9.86 comp., howards 254in.,260 ex., .550 .555 lift on 108 in at 102. 1 5/8 headers,3500 stall and 3.91 gears in a #3600 race weight 68 dart. Shift point will be around 6800 to 7000. Tunnel ram now that runs great...

Is a standard oil pump good to 7000 rpm in a unmodified block and factory clearences. Its a 340

Can I use 318 main bearings in a 340. I want 3/4 groove mains and can only find them for a 318. Summit lists 318 and 340 mains separately. Its been awhile but I think my 340 currently has 318 full groove mains I got off ebay. I remember grinding to change the upper main locating slot on something.

Have a problem with my friends 360. It has a bad vibration all the time. Its a stock rebuild with stock rods, pistons and crank all from this motors. Has new rings and bearings. Rebuilt stock heads, comp xe262 cam lifter and springs and new timing chain. It runs beautiful, doesn't miss a beat...

Hello all. Need some help with my friends car and its a ford but you guys are the best so I came here first. Buddy inherited 65 mustang with a 289 from his dad. Wanted more power so we rebuilt it. Bore was good so went with forged flat tops for 9.8 comp. Factory ported heads with 1.84 and 1.5...

Anyone here use the barbell type solid lifters with the huge oil band in a 340? I can get a set really cheap.

Has anyone ran a comp cams solid 306 magnum in a 10 to 1 340 and what was the rest of your combo and how did it run. Specs are 260 at .050 and .555 lift on a 110 lsa.

I installed my tunnel ram this winter on my 340. Engine is 9.8 to 1 comp. Ported 2.02 heads, hughes solid 237 242 at .050 and .537 .542 lift. Intake is eddy street tunnel ram with to stock 69 340 avs. Got to take it out today. Its a little cold blooded but once warm runs and idles really well...

Have a question about a preform 750 I bought awhile back. I opened it up to jet down a bit and noticed that it had screw in afr there are 6 other tapped holes in each metering block with nothing in them. 3 on each side. Is this normal and is this for further tuning. Or did they forget them at...

Changing my combo on my 68 dart. Now has a 340. 9.85 comp. ported 2.02 j heads. rpm intake. 750 preform dp. Cam is hughes solid 237 and 242 at .050. lift is .534 and .542. 2400 stall and 3.55 rear. New combo will be same motor except mopar 557 cam and eddy street tunnel ram with two small avs...

Anyone have experience with this cam in a 340. Engine is 9.85 to1 comp. ported j heads 2.02 intake valves. eddy street tunnel ram to small avs carbs. Car is 68 dart about 3300 lbs. 3.91 gears and 26 in. tall drag radials. I will order a custom converter once I decide on the cam. Probably ptc...

Just got my 360 in my dart. Runs strong and doesn't miss. Has the correct balancer and b&m flex plate. Doesn't vibrate in neutral when I rev the engine. Going down the road about the first couple miles when I floor it, it vibrates like hell feels like the trans is going come through the floor...

Just built a new 360. 9.25 to 1 comp. ported j heads 2.02 1.60 Performer intake deep gasket match. Lunati cam 234-242 at .050 .513-.533 lift on a 110. Heads are home ported maybe 230cfm in. 170 ex. just a gasket match, bowl port and stream line valve guide. Took a lot of the roof on the ex. I...

Have a problem with a holley 650 I just put on my 340. Car runs fine at idle, 1/4 throttle, and full throttle. It misses at 1/2 to 3/4 throttle. Hole shot is awesome. You cant hit the throttle fast enough to make it bog from an idle. Full out seems to be just as good as the 750 it replaced but...