Works for me , just need good tires . Daily driver , idles 900 not a problem in traffic never overheats , as of yet , knock wood . Was @ 424 hp before I shaved the heads to make them closed chamber , went from 9.8 to 11.4 compression . Small cam with the 273 1.6 rockers , ede heads and Mahle forged pistons . 3:55 gears 26" tire and a gear vendors overdrive , fun on the street , highway and track . Around $10.00 in gas gets me to the city 48 miles @ 1.42 a litre , sometimes less depending on traffic and weight of foot .how did you end up at 425 hp?
Stock 340 in an A body with a gear and a converter would run low 13's and that's only 275 hp.
a 450 hp 340 may not be the best street combination.
http://www.forabodiesonly.com/mopar/showthread.php?t=241854
I just converted this engine to EFI. It's a good street engine but has some slightly more exotic parts in it. I have a 4-speed car with 3.23's, have driven it to work, the woodward dream cruise, city, highway, whatever. Idles at about 950 no sweat.
how about 284 duration with 490 liftJMHO..... Look at head flows for the Edelbrock Performer RPM heads on their website; that is where you need to be in flow levels to have that HP level with a decently broad torque curve too. Get that flow in any head and get near to .525-550" lift and you will be there with standard stroke, with a pretty typical SBM cam profile, a good intake and exhaust, and modest sized carb. (I just reread El5Demon340's post.... looks very similar.)
The CR as suggested is good for general drivability. No need to go up to 11:1 at all IMO, and may be an issue for detonation unless you put in a longer duration cam...which in turn makes street driving suckier. I would stick with the 10.5 max for any street use, and look at some AL heads. But you have not said what you want to do with the car to see if that is needed...Is this purely for drag racing or street driving too? Any long cruising miles? That can make a big difference in the best plan of action.
425 hp in that340 with 388 gears in the back should do it!
3.91 with 3 teeth missingNever heard of 388 gears. What'd those come in?
3.91 with 3 teeth missing
magnum heads or 308 casting
Throw the 340 under the work bench and save it. Buy a crap 360 and build a stroker. That 340 is worth saving. Not like they're makin anymore of them.
Throw the 340 under the work bench and save it. Buy a crap 360 and build a stroker. That 340 is worth saving. Not like they're makin anymore of them.
Stroke it