Replacing FAST EFI on HP 383, with what?
Bottom line is I have to figure out how to get more compression ratio and I need a new cam and TC to match up to the heads. If that is what you are saying, then what cam do you recommend and what TC would go with it. You might tell me what carbs you would put on it to replace the efi (assuming I replace it).
Thanks for the education on this topic. There is an awful lot more that goes into "matching up" components to achieve the best results. Everyone wants to see their classic perform the best it is capable of doing. The main difference is whether you are going to run the strip, run only to/from/in town, or both. I will not be going to strip. I will however race myself on the way to and from home from the town. It is there I want the maximum performance. After running in town the engine usually wants to load up and needs to have an "Italian Tune-up" on the way home. (I used to restore Alfas, sorry about that) So, If I take what everyone on the forum has said in reply to this forum thread, and taking into consideration the numerous articles I have read, let me see if I am getting closer to what the 383 needs.
1) If the existing FAST efi does not respond as it should, I already have a 850 dp Holley I can convert to. A bit much, but with headers and a proper cam and TC, it should work, I believe. In either case, I will keep the Edelbrock DP4B on the engine. I find it hard to pass up on going with a 6 pack or two quads down the road, if for nothing more than putting on what is popular to buyers. I lean toward the 3x2s because of being able to run on the center one when not showing off.
2) I did order a set of headers from Schumaker as recommended.
3) I am going to stay with the Mopar 484 lift cam, for now. Once I am satisfied with the performance of the other components, I can always put in a recommended cam based on results.
4) I will either have the 727 rebuilt in accordance with street/strip options, or, purchase a newly rebuilt one. The cost is not that much different. The key is to get the best builder in the area.
If the existing trans is a boat anchor, I will purchase one from the likes of Summit, Monstertrans, B&M, Hughes.......
5) You all have taught me that the TC is a very important component to making this set up perform. I never thought it was that big of deal unless you were at a the drag strip. I have never owned a classic with an automatic. My guess is that this set up will need a 2800-3000 range TC, however, I believe I will leave the decision up to the recommendations of the trans rebuilder and the race shop technician putting it all together for me, while I take the input I get here and apply it to the same.
6) There was a lot of talk and recommendations for going with a different gear in the rear. I will change the 3.55 and go to a 3.73. or 3.91. Probably after I get the items above corrected. Any strong recommendation?
7) I did order, and am installing, a new MSD Billet disy to go with the mopar 6AL unit.
I ask all of you to please tell me if I am on the right track......have I missed something? I have tried to find ways to increase the compression ratio. It was raised up to 9.7:1, but I believe I understand more would be better. With out changing the head or tearing the engine down, I don't know how that would be accomplished. This is something I will most likely live with. I want to keep the Edelbrock Aluminum heads and build around them. The question is, am I going in the right direction to accomplish this? Am I? Any fine tuning? Thanks for listening to me trying to get smarter about this 383 +.030 set up for the Duster. A Happy New Year to all.
