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Sorry, StrokerScamp, I didn't see your post. Thanks for the info.

I ran my motor specs thru a few engine compression calculators too and with the steel shims at .020", 75-76 cc chambers with milled heads 0.60", flat tops .090 in the hole, stock bore and stroke I get 8.7-8.8-1. Will .2 of compression be a deal breaker with the 275 XE HL cam?

Here is what I know about this motor. Previous owner states 9.0-1. I know factory 452 heads were approx. 88 cc chamber volume. These heads were milled 0.060" which from what I have read puts chamber volume now at around 74-75cc. Pistons are stock and have no valve reliefs. Steel shim head...

Sure, lets here it!

Thanks! I'll have to give them a call.

Sounds great!! I am not in a big hurry. Will probably pick up the cam and lifters this week. I suppose I will also need the springs, retainers, and locks as well? Probably a new timing chain too right?? Hopefully Comp makes a kit with all of this. I have an engine shop in my area that I am...

You're pretty funny StrokerScamp. Sometimes I just need things spelled out for me to see the light! Remember I am an ex-Chevy guy right?! So I guess you have sold me on this XE275 HL cam. 1st questio: Do you think I can keep the springs that are already in the heads? (previous owner states...

Yea, I had two "over-cammed" Chevys (one was a 327, the other was a 496) that ran pretty well. They were both 10-1 motors. But since this is my first venture into Mopar, I'm learning all over again.

Sorry, I meant fit as in P to V clearance. However I just found out from original owner that he had valve reliefs ground .040" into the intake side of the pistons and that the piston is .090" in the hole at TDC. He was running a 300 duration cam several years ago, but couldn't remember the lift.

So then you think the 275 high lift you mentioned should fit without much of a problem?

I see that is one step up from what I have now. I was thinking something in the 280s/ around 240 at .050 no? I read some good and bad about the Mopar 484 cam which is one I am considering. I also was looking at the Comp 285 but that lift might be too much for my milled heads? I guess if I...

Well, a few days ago I finally swapped out the Demon 650 Vac Sec and the Holley Street Dom with an AED 750 DP and Performer RPM and it has made quite a difference in my 9.0-1 383!!!! Throttle response is sick! And the whistling issue has gone away too!!! My combo is: 1971 383 Magnum 9.0-1...

Moper: engine specs in previous post, but here they are again: 1971 383 Magnum Stock pistons as far as I know 452 Heads "fully" ported as told by previous owner. Milled 0.060 Compression: I was told by prev. owner 9:1 Comp XE 268 hydraulic cam Distributor is a Mopar Performance one...

Ok, so I got a chance to check the timing on my 383 yesterday. I found the intial to be at 4 degrees advanced and all in by around 18-20!! So I advanced it to total of 38 which leaves my intial at about 22 (it kind of bounces around a little so hard to see exactly where it is). Car runs much...

What all do you think I would need to change to get to 450 hp? I have the money for whatever upgrades I need so that won't be an issue. Also I wasn't able to check timing last night because I got home late from work and was too tired to go out to the garage (plus my new 4 mos old son needed...

It is a lot of info, I know. Thanks for all the input so far. Thats a good thought on the belts that I never thought of. They do feel a bit "shiny" when I checked them out "It is doubtful you would get any different feeling in the seat of your pants if you changed to a RPM Performer...

No thoughts? Anyone?

Thanks. I have a 6-pack hood with that big scoop so I think I should be ok. Demon Seed, can you review my other post on "whistling" and give me some of your advice/knowledge? As well as anyone else please??

Ok, thanks!!!!

Ok, so I finally got the Dart/383 on the road today. Seems to run ok. I did run into a few issues though. 1) Under full throttle, at about 3500RPM I frequently here a whistling noise that lasts a few seconds. Almost sounds like a loose belt. I checked all the belts and they are nice and...

I have no idea if they did that or not. I guess I'll remove the manifold and look. If it looks like it was machined, how will I know If I need to remove anymore? I assume if the new intake and head bolt holes line up, then it was milled?

Ok, so that is .074" off the actual intake manifold, correct?

I have a 727 rebuilt with a Dana 60 rear and 4.10 gears. 2400 converter. But regarding the RPM, how much do I need to mill off of it to match the heads that have already been milled down 0.060? Thanks.

First off, thank you for all of the responses to my initial questions about my new Dart/383 I recently bought. My question is this. Currently there is a Holley Strip Dominator and Demon 650 Vac secondary carb on motor. I really think I want to change that to a Holley 750 DP and...

Thanks for the info. The converter has a 2400 stall speed. Where can I get the roller rockers you were talking about Demon Seed? And would 1.5 or 1.6 be better? And the pushrods, how can I figure out the length I need and where to get them. Chevy stuff is everywhere. Don't see a lot of...

Thanks for all the info! I was thinking Holley 750 DP too. I never really liked vacuum secondary carbs anyway. The guy I bought it from said compression is 9 to 1, but since I didn't build it I don't know for sure. I read somewhere that the 452 heads are 88 cc chambers and that being milled...

Hi all!! First off, let me just say hello to everyone as I am new to this site. I've been a Chevy man all of my life, but as of last Sunday I now have a 1974 Dodge Dart with a 383 Magnum sitting in my garage!!!! My question is with the motor, since I really don't know much about...