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512 Low Deck Street-Strip build

JackpotJim

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Location
Brainerd Minnesota
I'm in the beginning stages of building a 512 low deck stroker for my street-strip 66 Coronet. I'm hoping to get some input from the wealth of knowledge that I see every day here in the race forum on B Bodies. The car sees limited use on the street, never gets more then 40 miles from house. Race track (BIR) is 7 miles from my house and I drive there when I race. My goal is a 11 flat, high 10's ET car. My 3750 lb car is set up with Hughes competition manual shift 727 with trans-brake, 9.5 inch 4000 stall street-strip converter, 4.10 rear gear, SS leafs, Calvert adjustable rear shocks, 28.5 MT 10 inch drag radial. Subframes are tied together, 90-10 Calvert shocks up front. Fuel system for the track is a 8 gallon fuel cell plumbed with QF electric pump and 8an steel braided line up to the engine compartment running 105 octane gas. My plan for the low deck 512 is a 440 Source kit with 11.5 cr flat top pistons, ring gaps will be set for mild nitrous shot, 78 cc aluminum head that will flow 265 on intake side, solid lift cam with 288 advertised duration, 615 lift, 1.5 roller rockers. Trick Flow single plane intake. Fuel delivery will be a Holley 900 cfm Sniper XFlow fuel injection system rated for 800 plus naturally-aspirated horsepower. Spark is from a MSD 6 digital box & MSD distributor. Looking for input, too much cam? Not enough cam? Does anything stick out as a bad idea? Only other thing I will add is I have a narrowed Dana 60 which will be installed when I do a mini-tub and move the springs in but that will be at least a year out. Thank you.
56219818_2321242081221821_3919724696362287104_n.jpg
 
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My 66 Coronet was a 505' (Only .030 over, not .060 over to make it a 512"). I used an Ohio Crankshaft Assembly with their H Beam Rods and their SRP supplied forged pistons with 12.2-1 CR. (you could go 11.75-1 probably and not lose much and might be easier on pump gas), Motor had 440 Source Steel Billet Main Caps and 440 Source Girdle.I had Comp Flat Tappet cam with about .650 lift. 440 Source rockers with 1.6 ratio. INDY Max Wedge heads ported to 340CFM from the regular CFM of closer to 310CFM. Dougs 2" headers with 3.5" collector. MSD Dist, of course. Indy single Plane 4500 Intake with 1050 Dominator. MSD 6AL box. Dana 60 with 4.30 gears and Hoosier 29.5 tall,11.25 tread with Bias Slicks. Calvert springs, bars and 9 way shocks and front 90/10 shocks.
5000 flash converter to my A&A Torqueflite. PRETTY BASIC STUFF. Ran consistent 10.15 and 129+ but as low as 10.04 @131+ with some good air. Ran 110 race gas at the drags.
And....absolutely streetable, drove it to car shows and hot dog stand get togethers all the time (thru Flowmaster Mufflers).
With the ET's and MPH my car was running it had to be making about 750HP.
When I originally built the motor it made 602 HP but had standard port (not max wedge) heads that only flowed 290CFM. I also had 1 7/8 Hooker headers, INDY dual plane intake with an 850 Demon carb....it ran 11.00 flat.
With the head, intake manifold and carb upgrades it went 10.04.
YOU DO NO NEED NITROUS TO DO WHAT YOU WANT.
Go with Max Wedge Heads, bigger cam, big headers, Single Plane 4500 intake and 1050 Dominator to start...don't start smaller and then spend the money to upgrade later.
I guarantee your car should run below 10.25 with this build similar to what mine was. I did all the planning for you when building and testing my car...no reason for you to build the lesser motor you described in your post above.
PS: don't worry about running a 1050 Dominator on the street, it runs just fine...no need for the fuel injection system. The Holley 1050 Dominator SP carb is only $810 on Summit.

LAUNCH 2.png 20151231_133148.jpg
 
Good looking Coronet!
Most of the components in the build you have outlined would seem to be well suited to outperform your 11.00 goal, except for perhaps the most important. The heads. Tell us more about the heads and the cam.

ps: I hope you have plans to also install a bar into that bad boy!
 
Good looking Coronet!
Most of the components in the build you have outlined would seem to be well suited to outperform your 11.00 goal, except for perhaps the most important. The heads. Tell us more about the heads and the cam.

ps: I hope you have plans to also install a bar into that bad boy!

Thanks for the reply, I'm still up in the air as to which heads to go with and I have time to decide. I own a set of Edelbrock RPM's which I could have ported to make them flow better but also looking at a CNC Speedmaster heads with 265cc runners out of the box. I guess I'm not sure where you cross the line at which point the head is too big for the street. Two cam profiles I'm looking at are a Howards solid lifter with duration of 288/288, Lift .616/.616 or a Lunati with duration of 286/296, lift 604/615. Would like to look at other cam profiles with lift in the mid 600's but have not seen anything that I thought would work with my 4000 stall converter.
 
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My 66 Coronet was a 505' (Only .030 over, not .060 over to make it a 512"). I used an Ohio Crankshaft Assembly with their H Beam Rods and their SRP supplied forged pistons with 12.2-1 CR. (you could go 11.75-1 probably and not lose much and might be easier on pump gas), Motor had 440 Source Steel Billet Main Caps and 440 Source Girdle.I had Comp Flat Tappet cam with about .650 lift. 440 Source rockers with 1.6 ratio. INDY Max Wedge heads ported to 340CFM from the regular CFM of closer to 310CFM. Dougs 2" headers with 3.5" collector. MSD Dist, of course. Indy single Plane 4500 Intake with 1050 Dominator. MSD 6AL box. Dana 60 with 4.30 gears and Hoosier 29.5 tall,11.25 tread with Bias Slicks. Calvert springs, bars and 9 way shocks and front 90/10 shocks.
5000 flash converter to my A&A Torqueflite. PRETTY BASIC STUFF. Ran consistent 10.15 and 129+ but as low as 10.04 @131+ with some good air. Ran 110 race gas at the drags.
And....absolutely streetable, drove it to car shows and hot dog stand get togethers all the time (thru Flowmaster Mufflers).
With the ET's and MPH my car was running it had to be making about 750HP.
When I originally built the motor it made 602 HP but had standard port (not max wedge) heads that only flowed 290CFM. I also had 1 7/8 Hooker headers, INDY dual plane intake with an 850 Demon carb....it ran 11.00 flat.
With the head, intake manifold and carb upgrades it went 10.04.
YOU DO NO NEED NITROUS TO DO WHAT YOU WANT.
Go with Max Wedge Heads, bigger cam, big headers, Single Plane 4500 intake and 1050 Dominator to start...don't start smaller and then spend the money to upgrade later.
I guarantee your car should run below 10.25 with this build similar to what mine was. I did all the planning for you when building and testing my car...no reason for you to build the lesser motor you described in your post above.
PS: don't worry about running a 1050 Dominator on the street, it runs just fine...no need for the fuel injection system. The Holley 1050 Dominator SP carb is only $810 on Summit.

View attachment 901999 View attachment 902000

Thanks Mike, I've learned a lot from your posts over the last year, Will have to look at Max Wedge 325 intake runner size head option. My car has a plate nitrous system on it now with my current 440 set up. Glad to hear your set up was driveable on the street. My grandkids love getting rides in my old Dodge, my 4 year old granddaughter was at the house on Sunday and asked if we can take the red car out for a ride. I told her we had to wait for the 2 feet of snow to melt first.:):):)
 
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Box stock Eddy RPMs without nitrous will put you in the range you want. Spraying it will put way down in the 10s or high 9s. Last 2 combos at similar weight to yours. #1 69 GTX ; 452", 12.0-1, 590 purple shaft, torker, 850 Holley #2 65 Belvedere; 446", 10.0-1, 557 purple shaft, low rise Weiand 2x4 , 2 600 Eddy carbs. Both cars had good matched converters, 4.10 gears, 10" slicks open exhaust, untouched Eddy RPM heads. The 65 runs 11.30-11.40. The GTX ran
10.90-11.0.
Doug
 
Box stock Eddy RPMs without nitrous will put you in the range you want. Spraying it will put way down in the 10s or high 9s. Last 2 combos at similar weight to yours. #1 69 GTX ; 452", 12.0-1, 590 purple shaft, torker, 850 Holley #2 65 Belvedere; 446", 10.0-1, 557 purple shaft, low rise Weiand 2x4 , 2 600 Eddy carbs. Both cars had good matched converters, 4.10 gears, 10" slicks open exhaust, untouched Eddy RPM heads. The 65 runs 11.30-11.40. The GTX ran
10.90-11.0.
Doug

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.
 
JackpotJim, I ran my 65 for a while with a B 451,3500 stall, 4.10,full street trim 3800 lbs with me in it.Edelbrock RPM heads,no port work and a mild .490 lift hydraulic cam.11.90's @ 110 mph. Also put 30,000 miles on the street.I agree with Mike that NOS is not needed.Your goal with the program you have stated should be easy to attain.
 
JackpotJim, I ran my 65 for a while with a B 451,3500 stall, 4.10,full street trim 3800 lbs with me in it.Edelbrock RPM heads,no port work and a mild .490 lift hydraulic cam.11.90's @ 110 mph. Also put 30,000 miles on the street.I agree with Mike that NOS is not needed.Your goal with the program you have stated should be easy to attain.

Thanks Darter, I appreciate you sharing your set up in your 65. I will be happy finding the set up that gets me high 10's. I don't need to go anywhere beyond that point. Only reason I included the nitrous info is it is on the car now and throwing a plate between the FI and intake manifold regardless of what motor is in the car is simple since its already plumbed.
 
Two cam profiles I'm looking at are a Howards solid lifter with duration of 288/288, Lift .616/.616 or a Lunati with duration of 286/296, lift 604/615. Would like to look at other cam profiles with lift in the mid 600's but have not seen anything that I thought would work with my 4000 stall converter.
j

I would contact a cam dealer and discuss with them your plans and see what they say fast68 is on this forum and can help you with your goals
 
IMHFO
the glaring item is
need more cfm flow more than 270 @ 0.600" gross valve lift
easily & it won't hurt it, for any street driving either
not with gearing & converter or your rocker combo
there's several aftermarket heads you can use
stock-ish style valve-train/non offset rockers on
a few box stock alum. heads even
(like Eddy RPM out of the box 290cfm @ 0.600" gross valve lift,
even a little cleaning up here & there or pocket porting & different valve cuts/angles
get 300+cfm etc., easily 320cfm is relatively easy even, they are a good /great
bang for the budget buck, there are better heads too, but they will cost more,
many are like 2 times more, but they are out there)

usually come with more cfm @0.600" gross valve lift
un-ported Stealth's std port are like 265cm


a wise ol' professional head porter/professional engine builder
once told me, three most important things when building a race engine

cylinder heads, cylinder heads, cylinder heads

a decent ballpark rule of thumb is appr. 2.14hp per/cfm of flow
2.14 x 250 = 535
2.14 x 270 = 577.8
2.14 x 300 = 642
2.14 x 320 = 684.8

as you can see if all the same add 70cfm of flow
& you get another 150hp

more than one way to skin a cat

have fun, do your diligence ask a pro
don't build by committee

a TRUE Professional builder will tell you

the biggest chock point on a MoPar BB wedge especially is the cylinder heads
flow makes HP, cfm flow is your friend
the engine, short-block/long-block is just a big air pump,
what goes in, it must come out
more air, more power !!
even for an occasionally street driven combo
don't be afraid of cfm flow, especially not at the levels we are talking here
 
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My Satellite is pretty much the same. My 512 has a little more CR & Max Wedge Indy heads. Some cam suggestions to give to the vendors.
 
One reason I like the idea of staying with a head that flows 240 to 270 is I can use my roller rockers,

This I don't understand. If in your budget, you can have most aluminum aftermarket std port heads ported the to 320+ CFM and retain the standard port. I would call it standard port plus.
 
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.
15804310775454732198195191844888.jpg
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!
 
IMHFO
the glaring item is
need more cfm flow more than 270 @ 0.600" gross valve lift
easily & it won't hurt it, for any street driving either
not with gearing & converter or your rocker combo
there's several aftermarket heads you can use
stock-ish style valve-train/non offset rockers on
a few box stock alum. heads even
(like Eddy RPM out of the box 290cfm @ 0.600" gross valve lift,
even a little cleaning up here & there or pocket porting & different valve cuts/angles
get 300+cfm etc., easily 320cfm is relatively easy even, they are a good /great
bang for the budget buck, there are better heads too, but they will cost more,
many are like 2 times more, but they are out there)

usually come with more cfm @0.600" gross valve lift
un-ported Stealth's std port are like 265cm


a wise ol' professional head porter/professional engine builder
once told me, three most important things when building a race engine

cylinder heads, cylinder heads, cylinder heads

a decent ballpark rule of thumb is appr. 2.14hp per/cfm of flow
2.14 x 250 = 535
2.14 x 270 = 577.8
2.14 x 300 = 642
2.14 x 320 = 684.8

as you can see if all the same add 70cfm of flow
& you get another 150hp

more than one way to skin a cat

have fun, do your diligence ask a pro
don't build by committee

a TRUE Professional builder will tell you

the biggest chock point on a MoPar BB wedge especially is the cylinder heads
flow makes HP, cfm flow is your friend
the engine, short-block/long-block is just a big air pump,
what goes in, it must come out
more air, more power !!
even for an occasionally street driven combo
don't be afraid of cfm flow, especially not at the levels we are talking here
Thanks for the help, Had no idea you can get a Edelbrock RPM to flow those type of numbers. As I said above I'm not sure where you cross the line on cam size and runner size that just doesn't work on the street. I have a set of 75cc RPM's that are on the motor in my car now. Thanks again for the info.
 
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!
Sounds like a great set up, I see you're in ND, If you ever come to Brainerd to race let me know.
 
This I don't understand. If in your budget, you can have most aluminum aftermarket std port heads ported the to 320+ CFM and retain the standard port. I would call it standard port plus.
Thanks BSB, I'm getting a lesson on porting possibilities of these heads, had no idea you could get to a 320 CFM flow rate. Obviously I will have to look at porting option here in the Midwest. Thanks for the help. I really appreciate everyone's input.
 
Jim, for reference: I run Stealth heads that I had CNC’d & prepped by MCH. They flow 320+ on their bench. They can do the same thing with Eddy’s. That extra flow will put you beyond where you want to be with the rest of the combo you have outlined.
My Satellite weighs in at 3825 with me in it. 452 cubes at 10.6:1. cam is only 252* @ .050. My car goes 11.20’s with belt driven accessories. You can get to your goal pretty easily.
 
Jim, for reference: I run Stealth heads that I had CNC’d & prepped by MCH. They flow 320+ on their bench. They can do the same thing with Eddy’s. That extra flow will put you beyond where you want to be with the rest of the combo you have outlined.
My Satellite weighs in at 3825 with me in it. 452 cubes at 10.6:1. cam is only 252* @ .050. My car goes 11.20’s with belt driven accessories. You can get to your goal pretty easily.

Thanks Lemon for sharing your info, I've never had aftermarket Mopar heads ported before, I got a lot of good info on possible flow numbers with the aftermarket aluminum heads after some porting. I was a little confused on stated cc intake runner size, cfm flow and the flow numbers of different aluminum heads.
 
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