Aceshigh

I found the Desktop Dyno files I've been searching relentlessly for.
So I'm re-editing this thread to keep it for future reference and for others to discover.

Here's the link to all the Oldsmobile head profiles.
http://kdmiller.oldsgmail.com/dd2000/

The head flow numbers are not quite accurate, as they list bigger valves etc.
They're showing the best performance flow #'s for each head style.

Warhead

Thanks for the info, the BBO (A,B,C) stock casting flow numbers seem pretty close for a big valve head. Almost all of the exhaust ports seemed good.

The SBO casting intake info is flowing around 40cfm over a stock 1.88 valve. It is flowing 15 cfm over a stock BBO 2.00 intake port.
A stock Edelbrock flows around 240-245 on the intake, not 279.

ALL of these must have had work.

I did not receive anything that showed modifications with my download.

This is why the Chevy LS series engines run so damn good, the heads move massive amounts of air, and there is no fudging of the numbers like others have done.

It would be nice to know what was done to these heads to make them flow these numbers, for an honest apples to apples comparison.

My thoughts/opinions
Jim

Aceshigh

EXACTLY.

That's why I've been trying to find flow data on STOCK SBO Olds heads.
It's hard to use Desktop Dyno 2003 when you don't have correct head
profiles. You're inserting cam profiles and it's telling you you're going to
make 25-50hp more then reality because of the false head data.

It's very deceiving for guys looking to upgrade their motors and getting disappointing real world results.

Anyone have LEGIT factory OEM SBO head flow data ??
Especially for #6 heads that are NON-W31 heads ??

380 Racer

.....

Warhead

I no longer have any of my old flow numbers, but Mondello showed 185 on the #6 head at 25" vacuum. Still generous in my book.
I would use a figure of 175/180 cfm at .500/.550 lift, at 28 inches vacuum.

Jim

geckonz08

Is this what you are after?


https://classicoldsmobile.com/forums...w-numbers.html

Aceshigh

No, Alphabetical heads are big block heads. A, B, C, etc.
I saw that thread and I've seen where he pulled the data from too.

Nothing on Small Block OEM flow #'s out there.
I can't believe there's not 1 single verifiable source for Oldsmobile small blocks.

Makes me really believe these small blocks aren't too popular for performance......

J-(Chicago)

You're right in the ballpark, Warhead. The exhaust is worse than you thought though.



Small block iron 7a heads

Intake Flow #s (stock)

.100- (50)
.200- (105)
.300- (148)
.400- (170)
.500- (180)

Exhaust Valve Flow #s (stock)
.100- (40)
.200- (75)
.300- (105)
.400- (135)
.500- (145)

Warhead

You're right, these are not too popular for performance. Which is sad because you can double those flow numbers by bolting on a set of heads.

Check out 380racers build.

Check out J&S machine, give Jim a CALL!!! He's in Ill.
I sent him a PM, and he said he got 190 cfm on a set. Great guy, top notch machinist.
http://www.jsmachineoldsmobile.com/

If it is not posted on the internet, that does not mean it does not exist!

Here is a list of some more performance vendors, that will be more than happy to discuss what these castings will flow.
http://72.22.90.30/phpBB2/viewtopic.php?t=2021
Hope this helps.
BTW, thanks Jeremy.

Jim