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383 build - opinions wanted #443375 08/19/09 08:14 PM 08/19/09 08:14 PM
Joined: Mar 2004 Posts: 531 SE Michigan F farmington OP mopar addict
farmington OP mopar addict F Joined: Mar 2004 Posts: 531 SE Michigan	New 383 going into my duster. Using a pair of iron heads done by Muscle Motors (stage 1, big valve and pocket ported). Shortblock has a set of old TRW 12:1 forged pistons. Compression will be 10.2 with .040 gaskets or 10.7 with steel shims. Cam is a Comp solid Extreme energy 244 intake and 252 exhaust (at .050) and .520 intake lift and .540 exhaust. TTi 1 3/4 headers, 4.10 gear and a 3600rpm convertor. What compression do you think I should use and should I use a RPM intake or a M-1 single plane (have both). Have a holley 750hp carb and its sealed to 6 pack hood. Well.........? BTW car is primarily street driven.

Re: 383 build - opinions wanted [Re: farmington] #443376 08/19/09 08:41 PM 08/19/09 08:41 PM
Joined: Aug 2003 Posts: 3,245 Between a rock & a hard place C cudadoug master
cudadoug master C Joined: Aug 2003 Posts: 3,245 Between a rock & a hard place	I'd use the Performer RPM if it's a street deal. The best part though, it's only 8 bolts and about 20 minutes to swap and see what you like better. For CR, 10.7 might be a little high for pump gas, depending on what's available in your area. 10.2 might bt too much...it all depends on the gas, but that's where I'd start. I LOVE these 383 builds...poor little moder didn't get much respect.

Re: 383 build - opinions wanted [Re: cudadoug] #443377 08/19/09 10:11 PM 08/19/09 10:11 PM
Joined: Aug 2003 Posts: 43,173 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,173 Bend,OR USA	Quote: I'd use the Performer RPM if it's a street deal. For CR, 10.7 might be a little high for pump gas, depending on what's available in your area. 10.2 might bt too much...it all depends on the gas, but that's where I'd start. On the choice on the intake and the compression ratio, I would shoot for no more than a actual 9:75 to 1 compression ratio with todays pump swill I have a iron headed 446 RB motor that will ping on the local premium gas if I lean it down so it is at 14,2 AFR or leaner at part throttle with 34 degrees timing and medium heat range spark plug It is a true 9.46 to 1 mechanical compression ratio with a Eddy Performer RPM intake and a Holley #4781-7 850 DP carb This motor is not a true quench motor due to the 906 combustion chamber size and the late head casting Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: 383 build - opinions wanted [Re: Cab_Burge] #443378 08/19/09 11:01 PM 08/19/09 11:01 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I agree on using the Performer RPM on it for a mostly street car. My sons .030 over 400 is close to your build. He uses Eddy RPM heads with 10.6 comp but with the aluminum heads and the MP .557 cam it runs fine on 92 pump. His 400 is in a 72 Dart with 3.91's and he uses the Performer RPM with a 750 DP. His is a street car and it has the Dynamic 9.5 converter. It has run 11.40's in good air at almost 3600 lbs with him in the car. Sounds like you have a nice combo but I agree that without quench you are pushing it with that cam and 10.7 comp using iron heads. Good luck , Ron Last edited by 383man; 08/19/09 11:02 PM.

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