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Originally Posted by shortymac83
...I want to keep the 250 in there, but I'd like to see 200 RWHP and over 300 lb-ft. is this unreasonable for a street motor? I'd like to see the torque as low as possible....let's put a ceiling of $5,000 on this. Stock block and crank would be preferable, but the sky's the limit when it comes to camshafts and compression. Granted, it'll have a 4bbl carb and long tube headers, but I don't know what kind of cam or what kind of compression it should use....I'd like to use a quadrajet for the carb, with a 1" tall adapter on a squarebore offy intake. The reason for the qjet is its efficient fuel metering coupled to the HUGE secondaries and balls out 750 cfm performance.
...Exhaust will be straight pipes with no mufflers. If it DOES have muffs, it'll be getting either bassani or flowmaster mufflers....
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Yeah, you did make a boo boo saying "stump puller" when you aren't starting with enough CIs. No biggie.
Going for low-rpm peak torque is still a good idea.
One of America's 6-cylinder experts is
Clifford Performance in Temecula, CA (SoCal). Clifford specializes in wringing power out of 6-cylinders. Clifford has reworked countless sixes into far stronger engines than stock. They do it mostly with porting, bigger valves, higher compression, better intakes, and headers all matched well and packaged with balancing and blueprinting to protect high rpm use. Clifford can fuel inject some sixes. Click on "engine parts," then "Chevy," then "250." You definately need their catalog.
For muffs, I recommend
SpinTech Mufflers. They are all-welded 3/16" plate with internal "spin traps" that create a vortex with a venturi effect that scavanges the gases out the other end. They have solved the age-old problem of needing low back-pressure with quiet sound. They have quiet street muffs, performance muffs, and also sub-90db full-on race muffs that perform better than straight pipes. Can't say enough about them until you see the price tag. Available in SS and aluminized.