I've basically made the decision that this is the way I want to go. I've heard of real nice numbers from a full-boogie SR head with the max wedge opening.

Does anyone have flow numbers for a fully ported or preferably CNC ported Indy SR head?

Just got a quote from Scotty B a couple days ago for my 517, Non Max wedge window, don't know the CC's (Hope he won't mind)

From: ScottBrown

Got a set of standard window CNC'd SR's on the shelf for your low deck, they go 313 @ .500, 336 @ .600 and 344 @ .700

I have a set of CNC'd MW BD's that go similar #'s. The Indy Exhaust side is much better, but nothing that can't be worked around with some camshaft know how....


Scott

I'd want to see the .300-.400#'s too, I think the Dawgs might be a bit better in the middle.

was just in a mopar rag a month or two ago...tested at bartons shop(big article).....was either action or mopar muscle,as i recall..the max wedge size,with full port went i want to say like 370..(someone correct me if i am wrong)and indy offers this in cnc which is supposed to offer similar flow to what the barton number was(370)that should make some steam.........

Thanks.. I'll check my mag. Don. I guess Scottys CNC'd SR's have 84cc chambers. Trying to science it out for 11:1 with a .030 over 400 block.

I'd like to see 350+ at about .650 or so with maybe 270 at the .400 number.

Sounds like a good plan Un.......did you consider any other heads though?

Wes

hey wes...he is gonna have to come up with some sort of plan to hang with the smallblock crowd............so ole un is plottin and scheming..lol.....

Sounds like a good plan! I had the same thing in mind when I went with the 400, but it'll probably be a long time before it happens.

Gary - I thought they all came with 75cc chambers?? As for the flow numbers, I have heard 360 is a realistic number from a MW port job, but 370 may be possible in the right hands. I bought my heads used and already ported to MW opening. No flow numbers though.

Still going for the pump gas, huh.

I was thinking pump gas drags as I was reading the post I really thought there'd be faster cars there, like some 8 second ones. High 9s put ya right up there.

I was considering the bulldogs also, but went with eheads, little cheaper and good enough. Are indy sr's 84cc's? That'd be perfect as I want to keep mine at 11 to 1 and upgrade heads donw the road only. I think ya should just build it now... then I'll know what kind of potential I'll have down the road

Joe, the SR's chambers come out to 84cc AFTER the CNC work. 75 as delivered.

Those Pump Gas drags are still darned impressive considering the cars have to drive 30 miles one way, race and return 30 miles on the supplied gas.

Everone needs to consider intake port volume when comparing flow numbers (among other things). A 500 CID engine can tolerate some big volumes, but torque will suffer. It just depends on what the application needs.

The Indy heads and a low deck are a natural for headers and hood clearance. For some applications this is important, for others it isn't. I like the low deck block for strength when using a factory block over 600-650 hp range.

The max wedge port opening makes intake selection different. I think the Indy intakes are very good for drag race applications. But from my experience, part throttle will suffer noticably. What would be the best way to go for Unlawfl's application???

Gary, I would consider CR up to high 11's as pump gas for your application. You have enough cam, etc. IMO, a zero deck (within 0.002") and the right size combustion chamber, used with a flat top piston would be the most pump gas friendly.

Power to you!!! LOl

At 500CI, I think that's going to need a dished piston if you want to keep compression down.

Using the math for my 517 using 75cc chambers, I've come up with ~11.48:1 with 10 cc's for the gasket, 4 for eyebrows and 12 in the dish.

Gary, That's about the range I was looking for, 270 @.400, 345-350 by .650 is where I want to be. I'm actually looking at doing a -1 with some epoxy fill in the floor.

Spend the extra bucks up front and get the 440-1 kit. By the time you buy everything needed to install the SRs you'll be close to the cost of the 440-1 kit. The biggist difference between the SR and 440-1 head is the dog leg in the intake runner on the SR. The dog leg is elliminated on the 440-1 by using the off set rocker. Indy dosen't tell you this up front. How do I know this? A friend went with the SR heads last year and learned the hard way. He was a very unhappy camper.

With a flat top I'm coming up with 11.8:1 with 4.375x4.15, zero deck, 84ccs and .040 gasket. 80ccs makes it 12.3:1...

Is that the bore and stroke you had in mind Gary?

It would seem like kind of a shame to have low compression when 12:1 is so easy to get with a flat top, but wanting to stick with pump gas is sure understandable.

Here it is Rich..

You Entered:
Bore 4.375 (inches)
Stroke 4.150 (inches)
Rod Length 6.535 (inches)
Cyl. Head Vol. 84 (cc)
Deck Height 0.0 (inches)
Head Gasket Bore 4.41 (inches)
Head Gasket Thickness 0.039 (inches)
Piston to Cyl. Wall Clearance 0.004 (inches)
Top Ring Land Height 0.25 (inches)
Piston Dome Vol. -4 (cc)


Compression Ratio:
11.449 : 1