Ok, I have decided on everything I am doing to my 383 that will go in my '70 Coronet.

KB 400's
440source heads (80cc closed chamber)
XE 274 cam/lifter kit
Performer RPM intake
MP ignition kit
1 3/4" headers
750 carb

How does this combo sound to you guys? Just want a nice streetable engine. Any idea if I will have DECENT compression and quench (stock deck height).

Thanks

Sounds like a well matched setup.A quality 11" converter and some 3.55's will make it happy.Run 1 3/4 long tube headers and 2.5 mandrel exhaust for best results.For more cruising/less racing one step smaller on the cam and 3.23's will be a smooth but still quick ride.

750 carb my 383 ran a whole lot better with a 650. Same general build. You might have to jet it down.The rest sounds great

Thats close the the 383 we ran in my sons Dart. It had stock pistons with 906 heads I milled and bowl blended and got 9.5 comp. I used the RPM intake with a 750 DP. But I used the MP .484 cam and ran 3.91's with a Turbo Action 10" tight 3000 converter. I had the cam on a 104 centerline and it ran great. The Dart weighed 3550 with my sons 190 in the car. On G/60-15 McCreary's it ran a best of 12.31 @ 110. It really was a nice running combo. Yours sounds like it will run good. This is my sons Dart and it has the 400 in it in this pic but we used the 383 in it first for years. Ron

Sounds good to me! How far down in the bore are the pistons going to be? You may want to go through those heads before you slap them on your engine. I've read some scaring things about those heads on this web site! Also go with the valve springs that your cam calls for. Have you fired it up yet? If not make sure you use oil with plenty of zinc/phosphates and break-in oil. I too have a 69 383 that I had rebuilt a couple years ago with those same pistons. Also make sure you gap the top rings the way Keith Black recommends them.

sounds pretty good but I'd maybe go a tad smaller on the cam/carb & you could find what 383 deck heights come in at which'll b diff I'm sure from the listed height & with the piston CH/rod C to C & 1/2 the stroke & the head gasket figure your CR as close as you can on the KB calculator. Are the KB 400's a quench pad piston and b aware that the quench pad height is not included in the CH dimention & iirc the ones for my 451 (dont remem the # right off hand) the pad is an addt'l ~.060". You'll want the SCR up higher & I'd consider having someone good, port em as you've went this far otherwise (reportedly) you may b dissapointed (if no porting) & will b leaving ALOT on the table. Sure I cant persuade you to build a 451 (400 B block/440 crank) . There'd b less down time as you'd b driving the 383 till the 451 is ready to drop in & the outside dimentions would b the same so all the externals would fit right up & the torque diff would b night and day

Almost identical build as mine. Slightly smaller cam, Comps 275DEH (235/482). Was able to use the stock head gear. No real quench at .063 with Felpro's 8519. Stock deck height. Runs really well, I'm happy. I'm at 9.9:1 compression.

what gear and converter? what 750 carb? I don't know why a 750 would be to big. As mentioned that cam will like a little stall and gear.

I wouldn't use the KB400 if you are going to have a pair of 80cc heads, your compression ratio is going to 10.5 and since this is a street cruiser you don't need that , building to use 89 octane is a better idea than 93 or more.

A flat top piston would be a much better choice , the Speed Pro 2315 will not require as much decking of the block to get it close to zero.

I just checked the KB site , they say 10.5 with an 80cc head , but they don't tell you that's is after you cut .024 off the block to bring it to zero. If you just skim the block to square it then your compression will be 9.8ish, which is better.

I'd pick a better cam also.

Fuel economy = small carburetor 600 to 670

Performance = 3310 Holley 750

Quote:

---

I'd pick a better cam also.

---

Suggestions???

Quote:

---

A flat top piston would be a much better choice , the Speed Pro 2315 will not require as much decking of the block to get it close to zero.

---

Any chance that valve to piston clearance would be an issue for that cam considering the lack of valve pockets in the Speed Pro 2315?

Thanks for all the input.

I found a compression calculator and I'm coming up with just a tad over 10:1 using the positive 6cc from the KB 400s, a .039" head gasket, 80cc heads, the piston .020" in the bore, a 4.28 bore and a 3.38 stroke.

Might want to mock it up & see what the deck height actually ends up being as you can then mill the piston deck/valve reliefs for VP clearance/less CR if need b then dissassemble & have it balanced and depending on your octane you may want to adj the CR but w alum heads you can get by w (& prefer) higher & I like to b able to max the adv curve WO having to compromise it cause the DCR is too high for the octane. Good Luck & holler what CR it ends up being and how it ends up running for you

Looks good to me.

You may want to look into the Retroteck / Professional Products Powerjection III TBI system.
750 cfm says it supports 550HP? It looks like an easy to install FI system, and comes with the fuel system for $1650.00
http://www.retrotekspeed.com/products/powerjection-iii/powerjection-iii-system.html

http://www.summitracing.com/parts/PFS-70026/

With alum heads ...I would do more CR and then use pump-premium.