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Discussion Starter · #1 ·
So my 638 Block is finally ready. I got the Rotating Assembly from our buddy Skip White.


Block has been decked, bored, honed, new cam bearings, and all the clearances measured and ready for me to assemble. I am thinking of these Heads.


One reason is because they are available, the other reason is I want more Ooomph than my current 406 is producing... My thinking is these heads flow very well, have good reviews, and are available today.

Hot Street/ Strip use. Of course all the goodies like full length headers,Tight 3200 Stall Converter, steep gears, etc... It should have right around 11.1 to 1 with a 64 cc Head.

I am ok with a Peak of around 6500 or maybe even more. Straub is making me up a Tight Lash Mechanical Roller for my 427, and I am thinking of going the same route with this one. He has lots of Irons in the fire right now, and I want to get this engine together sooner, than later...

Is this something I should call for Camking or Bullet for, or do you guys think we can get it close here?

Also let me know if we need more info...
 

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Discussion Starter · #3 ·
do you have flow numbers on your head choice?
A solid roller is the best choice imo

Yes Solid Roller with some 6591 Morels maybe?

These heads flow 253 179 @.400
274 193 @.500
287 199 @.600
293 201 @.700

Its looking like we will be twisting this one to about 7000 rpm!
 

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Discussion Starter · #6 ·
Now that I am putting more thought into this post, and am more able to do research.

How about this? 254/258 @ .050 .424 .424 This is what Jones recommended to someone else on a similar build, and pretty close to what Moose recommended also.

I am also really leaning towards the 215s listed above from ProMaxx. I put in some emails today to Jones, and Bullet too. So just waiting on response from them.
 

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Discussion Starter · #7 ·
Ok. Typical for me, there's a change. Just got wind of a set of Profilers that Chad Speier has for sale.
They are 205 runner castings that he did for a hot 383 street motor. I will get the numbers from him tomorrow and i can start all over again!
 

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Chads heads are fantastic. I said 8º split because the flow numbers you gave us were low 70s%. And with split rockers you can use the smaller cam with very good results. the 254/258 you did not say ratios or centerlines?
Either way the engine will make above 500 hp especially with Spieir heads
 

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Discussion Starter · #9 ·
I got the flow numbers from Chad yesterday.
These are Profiler 205s hand ported by him specifically for a street driven 383.
I sent in info to Mike Jones, and Im waiting on his recommendation so Speier can put the right springs in and ship them out to me.
Flow numbers are as follows.
.200 147/115
.300 208/149
.400 256/183
.500 289/202
.550 300/209
.600 303/216
.650 305/220
.700 306/224
They should be real "Meat Eaters" as Bogie says.
 

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Discussion Starter · #15 ·
You are missing the point
you are
usually much better
I think Chad uses Bullet cams for the most part. But has worked with Jones before in the past.

I am choosing to go with Jones for a couple of reasons. Number one, being a fine reputation for quality, and power. Number two, he is right in the other side of the Uwharrie Forest from me. (About an hour away)

And E. is a good man. I have never seen him get snarky, or snippy, or act out of line. Even in the face of being provoked. He is better than that, and I value his opinion because he tells it like it is, without carrying around a large ego.

Thanks again guys, this forum has never let me down in over 5 years. If it wasn't for you guys, I would still be riding around in a 78 pickup with over 250k miles on the 190 horse engine. That old blue engine still runs, and i keep it as a backup. But the 406 in it hunts, and i can't wait to see what this next engine will do. (Will probably put it in the 87 SS)

I am pretty sure it will be together before my 427 that i have been waiting on parts for over a year, and have heard "next week" more times since before Thanksgiving than you can imagine...
 

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Discussion Starter · #17 · (Edited)
I can't wait to see this come together. You did a great job! As a Native son of NC; you and Mike will do us proud I'm sure. And you're right on all fronts.
Thanks, I wish I still had that 67 Chevelle that we talked about putting one of your really nice transmissions in. This motor would work perfect for that!
Actually I'm really glad I gave that car back to its owner. It needed floors, paint, interior was shot, and of course suspension and rear end. The Monte Carlo that I have now has a good enough paint job, all original interior that is still in really nice condition. Of course all the work I'm doing to it can't be seen unless you put it on the lift, or pop the hood. But I'm okay with that. It will be way quicker build, and a whole lot easier on my pocketbook!
 

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ust make sure you nail down the rear gear ratio and that mike's cam is suited for it. And that 4 speed will be a game changer. Dont forget the HotPass on Speed-Talk.com

I believe it will get you a discount from mike, and other places. We give a 5% discount.

Thanks, I wish I still had that 67 Chevelle that we talked about putting one of your really nice transmissions in. This motor would work perfect for that!
 

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Discussion Starter · #19 · (Edited)
I got a few numbers in today, and I am interested in hearing you guys' thoughts on this combo.
I am really leaning on putting this motor in the Monte Carlo, and putting the 427 in my truck.
But I am wanting to get an idea of how much power this little 383 is going to produce.

Mike Jones said this will make Peak Power @ 6600 and pull through to 7000. When this goes in the Monte Carlo it will be fed by an Edelbrock Pro Flo 4 with 42 pound Injectors.
2004R with Freakshow 3200 Converter
3.42 Posi GN 10 bolt rear.
1 3/4 Full Length into 3 inch X pipe with Dynomax straight through welded case mufflers.
Car weighs about 3500 pounds.

Again, this is a 4.030 with 3.75 Scat Crank with 6 inch rods, and Wiseco Flat Tops. It will be very close to 11.1 to 1. Mike Jones is fixing me up with a Mechanical Roller.
Cam# SBC, R76424-77424-110
254/258 @.050
.424/.424 Lobe Lift
.660/.659 Net
110 LSA

Heads are worked over by Speier. They are Profiler Castings with a 205cc runner.
Flow numbers are as follows.
.200 147/115
.300 208/149
.400 256/183
.500 289/202
.550 300/209
.600 303/216
.650 305/220
.700 306/224

Lets hear your thoughts.
And Go!!!
 

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I'd expect it to have no problem making 550HP, and probably more likely edging up near 575hp.
Those are really good numbers from the cylinder head.

You are definitely going to test the proficiency of your 200-4R builder :D

Sounds like it is going to be a really nice ride.
 
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