512 Low Deck Street-Strip build

[dvw]

I'd build the ring gap big. Wont hurt anything N/A. But it may save you if you decide to spray. Eddy rpms can be opened to Max Wedge. The casting reamains the same. The rockers remain the same in this application. I've seen cars run 10.0 index with these heads. I believe Bob at Modern did them.
Doug

 

[JackpotJim]

I'd build the ring gap big. Wont hurt anything N/A. But it may save you if you decide to spray. Eddy rpms can be opened to Max Wedge. The casting reamains the same. The rockers remain the same in this application. I've seen cars run 10.0 index with these heads. I believe Bob at Modern did them.
Doug

Thanks Doug, I got a wealth of knowledge the past couple day on what is possible with these aluminum Mopar heads for the kind of engine I'm building. I found a local CNC porting service in the north Metro of the Twin Cities I'm going to talk to in the next couple weeks. Thank you

 

[Mike Gaines]

I like that set up in the GTX, Thanks for the info. One reason I like the idea of staying with a head that flows 240 to 270 is I can use my roller rockers, I think the big Max Wedge style heads require offset rockers. I still need to confirm that though.

INDY max wedge heads do NOT require offset rockers...just the INDY440-1's

 

[Mike Gaines]

I'm running a 512 in a 66 Coronet. 12.4 compression, hughes 268/272 solid cam, hughes 1.6 rockers, trick flow 270 heads, Super victor intake and a small 850 carb. 2in TTI headers, 3in exhaust. View attachment 902351 Ran a 10.46 at 129 first day out. Use pump gas for street and mix 110 50/50 at track. Very steetable and fast motor. Can't wait to put the 1050 dominator on it. Chassis is pretty much same as yours, Calvert everything in rear 90/10 in front. 3.90 gears, 4200 stall, 30in tall tires. What a blast!

Use an HVH 4150 to 4500 carb adapter and mount up a Holley 1050 Dominator SP (from summit at $811 brand new) and you will pick up a couple 10ths.

 

[BSB67]

Eddy rpms can be opened to Max Wedge. The casting reamains the same. The rockers remain the same in this application.

Oh ya, that too.

Throw in 2.19 valves too. Arguably you're getting to the point of diminishing returns on those (Eddy, Stealth, Sidewinder....) heads. The max wedge port adds like 10 cfm on the higher lift numbers, and the 2.19 valve adds adds about the same at the 0.300 lift numbers comparing MCH to MCH work.

 

[dvw]

INDY max wedge heads do NOT require offset rockers...just the INDY440-1's

Indy SR don't require offset intake rockers. Max Wedge port can be in either SR or -1 Indy head.
Doug

 

[JackpotJim]

Indy SR don't require offset intake rockers. Max Wedge port can be in either SR or -1 Indy head.
Doug

So I'm thinking if I can build or find a head that flows 340-350 cfm at .650 lift that should be a good spot to be for a 650 HP low deck stroker street strip motor.

 

[biomedtechguy]

find a head that flows 340-350 cfm at .650 lift

 

[bfunk]

I'm definently impressed by the trickflows. I run the 270s, they're a max wedge type head. Flow great right out of the box and are pretty reasonably priced.

 

[biomedtechguy]

I'm definently impressed by the trickflows. I run the 270s, they're a max wedge type head. Flow great right out of the box and are pretty reasonably priced.

My only decision to make when the time finally comes is TF 240s or 270s. I am going to use an aftermarket aluminum block, so my displacement is going to be larger than I had originally planned.
At 541, it's going to be hard not to go with the 270s.

 

[dvw]

Plenty of heads that will get the job done. Plenty of used ones as well. ET all depends on what cam, compression, and converter you want to throw at it. Most of that you have lined up well. When you select a head call on a cam recommendation. My suggestion is ask someone who's built many of these combo's and dynoed them. The majority of us speak from personal experience. This means we have seen far less results. Dwayne Porter, Brian at IMM,,etc have done way more.
Doug

 

[Mike Gaines]

Indy SR don't require offset intake rockers. Max Wedge port can be in either SR or -1 Indy head.
Doug

Or....INDY EZ heads, which I think kinda superseded the SR head. EZ Heads can be ordered in standard port or max port and take regular rocker arms, not offset.

 

[68 HEMI GTS]

The flow sheet on my MCH ported SR’s. They’re still “standard port” but you’d be lucky to ever find a standard port intake you can enlarge that big. In hind site I probably should have went MW port but I wanted the six pack to fit. I’ve considered opening them up the rest of the way but then I’m kinda stuck on intake selection.

 

[IQ52]

Perhaps this will give you some idea what your build will do with some slightly worked RPM heads (flow figures below). This is a street engine, never to see the dragstrip. Built Feb. 2011.

.040" over 440 + 4.15 Stroke crank to = 496ci

10.3 compression, 91 octane pump gas

Lunati Voodoo solid roller, 40230733, 361-440, 279/285, 249/255 @ .050, .585"/.600" using 1.5:1 rocker arms.

Ported RPM heads, stock port window, 2.14/1.81 valves
75 cfm @ .100"
156 cfm @ .200"
221 cfm @ .300"
259 cfm @ .400"
295 cfm @ .500"
309 cfm @ .600" Still got over 650 HP, see below.
321 cfm @ .700"

Dyno runs below used same long block and just changed intakes. Carburetor was the same 950 cfm Quick Fuel on all dyno runs.

Edelbrock Victor intake, 2" HVH spacer, 621 lb-ft @ 4,100 rpm, 629 lb-ft @ 5,000 rpm, & 656 HP @ 5,900 rpm, plus 650 HP still at 6,200 rpm

Ported Edelbrock RPM Performer dual plane, 630 lb-ft @ 4,000 rpm & 632 HP @ 5,700 rpm, plus 631 HP still at 6,200 rpm

Edelbrock Torker II, 2" HVH spacer, 627 lb-ft @ 4,000 rpm, 642 lb-ft @ 4,600 rpm & 642 HP @ 5,800 rpm, w/637 HP @ 6,000 rpm.

You can get your RPM heads ported but I'd use the 240 Trick Flow heads if it was in the budget.

 

[JackpotJim]

Perhaps this will give you some idea what your build will do with some slightly worked RPM heads (flow figures below). This is a street engine, never to see the dragstrip. Built Feb. 2011.

.040" over 440 + 4.15 Stroke crank to = 496ci

10.3 compression, 91 octane pump gas

Lunati Voodoo solid roller, 40230733, 361-440, 279/285, 249/255 @ .050, .585"/.600" using 1.5:1 rocker arms.

Ported RPM heads, stock port window, 2.14/1.81 valves
75 cfm @ .100"
156 cfm @ .200"
221 cfm @ .300"
259 cfm @ .400"
295 cfm @ .500"
309 cfm @ .600" Still got over 650 HP, see below.
321 cfm @ .700"

Dyno runs below used same long block and just changed intakes. Carburetor was the same 950 cfm Quick Fuel on all dyno runs.

Edelbrock Victor intake, 2" HVH spacer, 621 lb-ft @ 4,100 rpm, 629 lb-ft @ 5,000 rpm, & 656 HP @ 5,900 rpm, plus 650 HP still at 6,200 rpm

Ported Edelbrock RPM Performer dual plane, 630 lb-ft @ 4,000 rpm & 632 HP @ 5,700 rpm, plus 631 HP still at 6,200 rpm

Edelbrock Torker II, 2" HVH spacer, 627 lb-ft @ 4,000 rpm, 642 lb-ft @ 4,600 rpm & 642 HP @ 5,800 rpm, w/637 HP @ 6,000 rpm.

You can get your RPM heads ported but I'd use the 240 Trick Flow heads if it was in the budget.

Thanks IQ, That's great info. I learned a lot the last couple days on these heads.

 

[66Satellite47]

The top builders generally know WTF. Sure worth paying attention. But sure are lots of results out there. The Pro guys do know the most, IMHO.

 

[JackpotJim]

For the guys running Trick Flow 270 heads with the Max wedge size runners on a low deck motor what intake options are out there. I have a Trick Flow Track Heat intake, wonder if I can open it up to use on the bigger heads? Or is the bolt pattern completely different?

 

[dvw]

Or....INDY EZ heads, which I think kinda superseded the SR head. EZ Heads can be ordered in standard port or max port and take regular rocker arms, not offset.

EZ is an exhaust port designation. EZ exhaust port is in the stock location not raised like SR and -1. Some EZ use offset intakes, some don't. There is more than one style.
Doug

 

[66Satellite47]

For the guys running Trick Flow 270 heads with the Max wedge size runners on a low deck motor what intake options are out there. I have a Trick Flow Track Heat intake, wonder if I can open it up to use on the bigger heads? Or is the bolt pattern completely different?

Bolt pattern is the same. Call TFS & ask how much the opening can be enlarged. Otherwise go with the 240 heads.

 

[cudatom]

I'm running a 512 in a 66 Coronet. 12.4 compression, hughes 268/272 solid cam, hughes 1.6 rockers, trick flow 270 heads, Super victor intake and a small 850 carb. 2in TTI headers, 3in exhaust. View attachment 902351 Ran a 10.46 at 129 first day out. Use pump gas for street and mix 110 50/50 at track. Very steetable and fast motor. Can't wait to put the 1050 dominator on it. Chassis is pretty much same as yours, Calvert everything in rear 90/10 in front. 3.90 gears, 4200 stall, 30in tall tires. What a blast!

Ran that cam in my Cuda with Indy Sr'cnc ported to max medge by MCH. Shifted at 6300 and ran a best of low 10 teens with a holley 950. Needed a Dominator.
I will say if you are running Hughes springs to keep an eye on them. Mine were dead at 150 runs and was running into valve float at only 6300.