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gentleman whats usually the cause of engine run on when shutting the car off? its happened a couple times recently when hot. i suspect a timing issue and if so is it indicitive of to much advance or to retarded? thanks.

Hey dan.. If you do decide to go with a comp xe268 cam i have one over on the classifieds.

well after much research with you folks and phone calls to summitt tech etc i have decided to go with the thumper cam cl20-601-4 with 287/304 duration and 497/483 lift for my particular application and shy away from the eddy. it may be an alright cam but i like comps reputation a little better...

thanks and keep the input coming pleeeez. still undecided but im zeroing in on what i should be looking for with each post and piece of information.....

412 stroker.. that thumpr cam was my other thought "cl20-601-4 with 287/304 duration" thats the middle selection. is that the one you have? the only thing i was concerned about with that cam is to much annoying shake at idle. i was looking at the eddy because it would compliment the rest of...

fellas could ya give me an oppinion on a cam swap? looking to go from a comp xe268/280 duration cam to edelbrock performer rpm cam with 308/318 duration in a 416 stroker. do you feel that amount of duration difference would bleed off to much compression? i currently have great compression...

yes ou812. after c.c.ing the chambers the builder felt we better be safe and stay with 9.1 compression. the pistons are diamond. well as i thought lots of different ideas and experiences. so you think the smaller thumper would work for me huh?? ill look further into that. wish i got the right...

thanks for the replys. some mention some pretty big lifts!! should i be concerned about piston to valve clearance issues with that much lift? i have dished 9.1 pistons and the heads never been shaved. whata ya think??

thanks for the feedback. brian mentioned and suggested the "mutha thumper". any thoughts on that knowing there specs? im leaning towards something like that but not against a custom grind. im really cam clueless here lol....

gentleman which size cam would you recomend for a 416 stroker motor? i currently have a comp cam xe268 477/480 lift and think its a little undersized? im looking at the "thumper series"? any thoughts on size or experience here for guidance. stock x heads, performer rpm intake, 750 cfm vac...

ok solution to the hot start issue for me was a 1/2 inch phenolic carb spacer "just barely clears stock hood" and summits pro-tourque starter. turns over instantly now and fires right off no matter what temp. chrysler starters are very lazy compared to modern i found. thanks for all the input...

340 fastback. looks real nice. i wish i was good with entering pics id send you some of mine. i went with the street hemi orange. in any case do your pistons have a little rattle to them when cold (are they forged?) just curious.

hellride just did this exact buildup and im in the fine tuning stage at this point. here is what combo i have and my opinion. started with a matching numbers 72 340 engine basicly all stock with 91000 miles. tired but ran good. -had block fully tested. prepped and line honed 30 over...

thanks for all the info. im going to try the insulator spacer plate from summitt and pray for no hood clearence issues. then replace the starter with a more powerfull new style. hopefully that will stop this nonsense.

340, if the gas is perculating out (evaporating) how is it flooding the engine? how would it get into the cylinders to flood it? its an evaporation thing right? im confused on exactly whats taking place with the fuel besides perculating. on the ignition post it does have electronic ignition...

thats pretty crafty smokn!!!! i like.

thanks 340. ive already decided to at least go the faster spin starter route. ill look into the gasket although it looks the same as what i have. on the heat crossover im not sure the rpm has one?? hmmm.

Gents. Got A Duster 340 That Has A Very Annoying And Embarrasing Hot Start Issue. I Have A Fresh Motor With An Edelbrock Rpm Intake And New Summitt 750 Cfm Carb On Top. The Car Runs Great And Is Tuned Properly But After Sitting For More Than 5 Minutes It Wont Refire Until Several Spins On The...

that sounds about right. read it somewhere. thanks.

gentleman anyone know the camshaft specs on a stock 72 340 lift/dur etc.? also was the 72 spec different than the early 70 models? cant seem to find it. thanks.

oldvart yes there is an X cast into the head at the plug hole-- thankfully.

fishy68 good eye but i have checked the numbers and they are correct. therefore im not sure what to think on that. perhaps they were changed at some point or ma mopar slid in a few x heads on these and we aren't the wiser for it. i appreciate all the feedback and knowlege. it has been...

rumblefish the thermoquad was recently replaced due to it being a little tired (floats sticking etc) but retained. it was replaced with a holley 650 w/vacum secondaries. i was under the impresssion that the regular performer manifold would give me a little more bottom end over the rpm and...

thanks demon i was reading your posts earlier. you seem to have a same car and similar set up to me. i will consider that other cam later. we'll see how it runs. i thought of this after the post!! think there would be any valve to piston clearance issues on the 268??

thanks for the above. heres a little more info:::: the rear gears are 3;55. the tranny is a 727 with a mild shift kit. it has the stock x heads and manifold. unsure on the convertor. this motors very virgin. on the manifold however i would like to swap it for an edelbrock performer. with this...

gentleman got a cam question here?? got a 72 340 duster with an all stock motor. anyone know what the cam specs ma mopar gave this motor when built (lift,duration) without removal?? im looking to upgrade but not sure on what to get for a good street performer with a little lope to it. (no...

i get the picture fellas and understand both sides. a "fine mist" would seem perfectly safe and no different then the well known water injection used in racing etc. i never would of guessed it would make a good cleaner however. that kind of surprises me. the poring method "will not be used" so...

what seems to be the most effective way to remove excess carbon from the valve seats without removing the heads. specificly what cleaner and what tecnique to apply it. i know a good highway run but something beyond that. i have been using techron 3 in the fuel tank which has helped (upped...

anyone know what a healthy compression reading should be for a 72 340 stock?? or what the range is?? this is the 8.5.1 motor.

rumblefish/terry thanks for the replys. this will be down the road but at least i can get a jump on what i want to do with all the input. seeing the heads and intake are pretty respectable from ma mopar already i may just have them freshened up (especially the heads) and re-install. what do...