Im old, and not currant with what out today re Mopar RB cyl heads...please help....

[Pysyko]

Hello & thank you,
What a great bunch!
I'll get right to it...
I have 11.00 11.50 second 1/4 mile dreams.
For my 1969 Super Bee.
Post car, and has subframe connectors & torque boxes.

Stock Bore E-440 HP2 Block.
I have the 440 Source 4.15 stroker kit.
Cam is Comp cams Street solid roller...
Magnum 288R
It's a 4 speed.

What I'm after is not necessarily comp ratio, but cylinder pressure.
And a piston cylinder head recommendation...
I know each set up is unique, while we come close to each other's setups if that's what's working!

Any hints or recommendations are truly welcome...
I am hoping you guys can bring me into the present in regards to cylinder heads and Pistons!

Best luck at everything y'all are doing!!

 

[Bigal75]

I would look at the new TrickFlow heads. They're the newest stuff out for the wedge. They'll easily support the power you're looking for. As for pistons, any of the big names. Get forged pistons.

 

[Cranky]

You can introduce cylinder pressure with a low compression engine but without decent quench/squish, you will most likely end up with a pinging engine in the lower rpm ranges. I've had my fare share of low compression engines (8-1) with cams that produced decent cylinder psi that pinged their butts off but have also dealt with several 10-1 (and higher) engines with tight piston to head clearances that run great and without ping issues.

 

[Garys1969RR]

One way to raise cyl pressure is of course higher C/Ratio. I run 13 to 1 C/R at 5400 feet, and I need to use 98 octane fuel, to keep from pinging. I also run a tight squish area of .037". Cam selection plays a big role too. Mine is a 509, which keeps cyl pressure down at lower RPMs. There are many variables involved, but as Cranky said, a tight squish area does wonders in keeping the engine from pinging when cyl pressures are high.

 

[Pysyko]

Hello & thank you,
What a great bunch!
I'll get right to it...
I have 11.00 11.50 second 1/4 mile dreams.
For my 1969 Super Bee.
Post car, and has subframe connectors & torque boxes.

Stock Bore E-440 HP2 Block.
I have the 440 Source 4.15 stroker kit.
Cam is Comp cams Street solid roller...
Magnum 288R
It's a 4 speed.

What I'm after is not necessarily comp ratio, but cylinder pressure.
And a piston cylinder head recommendation...
I know each set up is unique, while we come close to each other's setups if that's what's working!

Any hints or recommendations are truly welcome...
I am hoping you guys can bring me into the present in regards to cylinder heads and Pistons!

Best luck at everything y'all are doing!!

Thank you!
.030" over flat tops that came with the 440 source kit.
But since I am thinking of sticking with the stock bore, I will look for a
dome type piston "quench design".
Thanks especially for explaining how the quench will help with running higher
cylinder pressure. No, I sure don't want my nice car to sound like the engine has a set of keys jingling in it...

I had always thought I would use the 906 heads I have,,and if it wasn't fast enough I would swap to better heads. But maybe I should just go for new heads,,and not plan to take my just put together engine apart before I even drive it...

Things I forgot we're Super Stock springs.
And I keep changing my mind. I think a four barrel carb will be easier & probably faster than old six pack technolog.
But I have an edelbrock six pack intake,,with carbs... Well, it has 3 two barrel holleys, with a progressive Manual linkage, no vacuum pots, and an accelerator pump on each carb. They may total 1500 cfm, but I am forgetful...
I feel dumb, I didn't even notice when I bought them. The guy said they were a car that raced in Spokane, that they worked good. I didn't even notice the lack of vacuum pots, just got so excited to get a six pack I guess.
Then one day I'm thinking, why didn't they put accelerator pumps on the outer carbs. You can imagine my surprise when I went downstairs and saw what I had.
I hope I didn't waste m one wish on accelerator pumps!
Hopefully the are 30cc not 50cc... I won't have enough gas to drive the 20 miles to the track!
I read somewhere that Holley initially supplied these for the chev 427 tri power.
And then sold them to ChrYco who sold them in the direct connection catalog.
AnYway...the rest will be TTI headers & 3" exhaust. I don't know gears yet, I haven't decided on tire size or how far I will actually drive when done. I have a sure grip with 3:23's right now, and Cragar SS 15x8's with 275-60-15's.
I think I will stay with the same size drag radial...
Thanks again everyone...

 

[Garys1969RR]

If you want good quench with flat tops, you will need to use a closed chamber head. I use the 915 with larger valves 2.14/1.81, porting, and a steel shim gasket. ,020" thickness. This 451 runs low 12s at 5600 feet. Sea level equivalent would be low to mid 11s. Using stock rocker gear with the 509 hyd cam.

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Funny you mention the six pack, pysyko, because I just ordered a complete set up for my orange 69 Roadrunner. Its a 440 auto, and has the 906 heads, prob around 10 to 1 C/Ratio. Solid lifter cam, .510 lift. That car runs 13.30s at 100 MPH in the 1/4 mile. Perf RPM intake with a 780 Holley carb. So I will see what the six pack does for it. Some 440s have ran slower ETs with a six pack. Must be some other problem that I'm not aware of. I would expect a six pack equipped car to run faster.

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In my 13 to 1 motor I use Ross dome pistons with a flat area that matches up to the flat, or squish portion of the 915 head. Thats where I get the .037" clearance. Pistons are .017" below deck, and I use a .020 thick steel shim gasket. You wont be able to get this with the 906 heads unless you use a special piston made with what they call a "Quench Dome"

 

[Pysyko]

I would like to use 915 heads, but they are made of unobtainium around here...
Also,,looking how 383man gets his red car up to light speed,,I may /will check out those trick flow heads.
I am sure I will be changing piston style to match the heads.
I'm excited guys... Good thing I don't have a job thing, I'll be crash course cylinder head learning!
Gary, keep in mind my experience with six packs is 30 years old.
I had a 1970 LS 5 4 speed Chevelle...4.10 gears.
My best friend had a 1970 Super Bee, 440 4speed six pack,,3:54 gears.
And we were close, until my excuse for a Rat, could not keep up to the Bee...
Bumper to bumper to 110 mph or so,,and then he was gone...
After too many tries on a not great racing street, he is the winner.

But I think the problem is the one 30 cc accelerator pump on a set of carbs that adds up to 1350 cfm. I've heard that the vacuum secondaries are nice with autos, but a low end bog was common. It sure was on my friends car...
It was the reason I wondered wh not 3 act pump, until I saw mine.
The former guy using my six pack said the mechanical progressive linkage worked on his 4 speed car...
I would like to run it because it's kind of nostalgic... I have a lift off hood in addition to a ramcharger hood... I guess we'll see.
Good luck with your six pack Gary! One thought I had is maybe you can change the centre accelerator pump to the 50cc version?
Again,,thanks everyone.
So great to chat cool cars with great people!!
I'll figure out pictures some day so you can see where the car is at, and of my crazy six pack!
Best of luck,,everyone!
Talk to you soon!!

 

[69 GTX]

Pysyko, check out IQ52's thread Trick flows on 440 in this section. It's my engine and my goal is 11.50

 

[Garys1969RR]

You may want to check out my 69 RR 440 six pack clone under A 12 discussion. Good info on there too.

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I have some pics on there at the beginning. Would also like to see some pics of your six pack car.

 

[Pysyko]

Pysyko, check out IQ52's thread Trick flows on 440 in this section. It's my engine and my goal is 11.50

Thanks!
You must be chomping at your own bit to see what it'll make!!

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You may want to check out my 69 RR 440 six pack clone under A 12 discussion. Good info on there too.

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I have some pics on there at the beginning. Would also like to see some pics of your six pack car.

Going to search that this aft...
Thanks!

 

[Garys1969RR]

You can also get good squish/quench and decent C/R with 906 heads and a quench dome piston. But your C/R would be lower, like 11 to 1. Thats with 88 cc heads, .012 off the deck, and a .020 thick head gasket.

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If you want alot of cyl pressure, you could go with an aluminum head, like 84 cc, 12 cc dome pistons, a .040 gasket, zero deck, then you will be around 12 to 1. You will have to run a high octane fuel. And you would have .040" of squish.

 

[383man]

Thanks for the kind words. On my 493 I use the basic Indy EZ heads which are closed chamber and use the stock geometry rockers and have the exh ports in stock location. I built it at 10.6 comp and good quench. I run and race on 92 pump with no ping or problems at all. You can click the link in my signature and go down past halfway and see some of the 493 build I posted in the link. I also use a custom grind solid flat tappet cam from Dwayne Porter. Ron

 

[Cranky]

You might check out the stickys in the Racers Hangout and take a look at the combinations. There are many! I have one in there for a 10.60 car I used to have that ran 906 heads in the early 80's. Back then, there wasn't much choice in heads so you used what you could get. I wouldn't build that combo today but back then, it was a decent ride for the times and technology available.