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Re: Build me a 9.80 512 low deck
[Re: fast68plymouth]
#2262296
03/02/17 07:52 PM
03/02/17 07:52 PM
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Joined: May 2005
Posts: 1,030
ohio
67mprfan
super stock
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super stock
Joined: May 2005
Posts: 1,030
ohio
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How I'd do it....
-Indy SR CNC 295's, PRH prep(355cfm)
-Indy 400-3 intake
-4500/1050 carb
-2" headers
-.650-.700 lift easy on parts roller cam
-1.5 HS rockers
-flat top pistons(12:1 with 78cc heads)
-import crank and 6.535 rods of your choice
Should be an easy 750hp depending on exactly what you did with the cam.
You could use 440-1 CNC 325's for about $700 more, most of which is the added cost of the offset rockers(which is the main reason I suggested the SR's in the first place).
Dwayne won't the EZ work for your suggested build also
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
67 Belvedere that worked it's way in the 10's
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Re: Build me a 9.80 512 low deck
[Re: AndyF]
#2262302
03/02/17 08:00 PM
03/02/17 08:00 PM
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Joined: May 2004
Posts: 12,397
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,397
Taxes & Virus's R-US, NY
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I'm considering building a 512 low deck, I have a 230 71 date 400 block.
It will be for a 71 valiant, the car currently has a 383 that runs 11.70's and it weighs 3050 with out me in it.
I'd like opinions on heads, cam and rotating assembly.
Thanks If you want to be half way scientific about it you can go to Wallace and try a few calculations. 9.80 @3300 lbs will require roughly 700 hp. It is fairly easy to make 700 hp on dyno with a 512 engine. A pump gas 512 with a decent EZ head and a 270 duration roller cam will make 750+. You'll lose some power in the car depending on headers, coolant temp and converter but 750 on the dyno should get you down the track at 9.80 if you can hook it up the whole way. So basically what you are asking for is as easy as ordering some parts and bolting them together. I'd still use the 383 and increment my way to 9.80 rather than building a new engine and starting over but either way works. That's my basic combo currently in an RB block on pump gas.....Switching over to the same combo in a 400 low deck this year....
Last edited by Dragula; 03/02/17 08:00 PM.
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Re: Build me a 9.80 512 low deck
[Re: 67mprfan]
#2262354
03/02/17 10:37 PM
03/02/17 10:37 PM
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Joined: Jan 2003
Posts: 31,050
Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,050
Oregon
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How I'd do it....
-Indy SR CNC 295's, PRH prep(355cfm)
-Indy 400-3 intake
-4500/1050 carb
-2" headers
-.650-.700 lift easy on parts roller cam
-1.5 HS rockers
-flat top pistons(12:1 with 78cc heads)
-import crank and 6.535 rods of your choice
Should be an easy 750hp depending on exactly what you did with the cam.
You could use 440-1 CNC 325's for about $700 more, most of which is the added cost of the offset rockers(which is the main reason I suggested the SR's in the first place).
Dwayne won't the EZ work for your suggested build also The EZ head probably gives up some power to the SR due to the exhaust port design. Not sure how much, Dwayne and I have talked about this a few times over the years since I'm making more than 900 hp with my EZ heads. We've thought about prepping a set of SR heads and doing the test on my 514 but I don't really want to give Indy $2K of my money just to figure out if the SR port makes more power or not.
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Re: Build me a 9.80 512 low deck
[Re: AndyF]
#2262389
03/02/17 11:46 PM
03/02/17 11:46 PM
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Joined: May 2005
Posts: 1,030
ohio
67mprfan
super stock
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super stock
Joined: May 2005
Posts: 1,030
ohio
|
How I'd do it....
-Indy SR CNC 295's, PRH prep(355cfm)
-Indy 400-3 intake
-4500/1050 carb
-2" headers
-.650-.700 lift easy on parts roller cam
-1.5 HS rockers
-flat top pistons(12:1 with 78cc heads)
-import crank and 6.535 rods of your choice
Should be an easy 750hp depending on exactly what you did with the cam.
You could use 440-1 CNC 325's for about $700 more, most of which is the added cost of the offset rockers(which is the main reason I suggested the SR's in the first place).
Dwayne won't the EZ work for your suggested build also The EZ head probably gives up some power to the SR due to the exhaust port design. Not sure how much, Dwayne and I have talked about this a few times over the years since I'm making more than 900 hp with my EZ heads. We've thought about prepping a set of SR heads and doing the test on my 514 but I don't really want to give Indy $2K of my money just to figure out if the SR port makes more power or not. Thanks Andy I didn't know how much better the SR was compared to the EZ's
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
67 Belvedere that worked it's way in the 10's
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Re: Build me a 9.80 512 low deck
[Re: RV2]
#2262694
03/03/17 03:26 PM
03/03/17 03:26 PM
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Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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The SR 295 ex port is 35-40cfm better than the EZ 295 ex port, plus on a low deck the SR ex port is at the "normal" RB block height, which allows for a few more header options.
For the little difference in cost between the two heads, I'll take the extra ex flow.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Build me a 9.80 512 low deck
[Re: RV2]
#2263622
03/05/17 12:53 PM
03/05/17 12:53 PM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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No brainer for me, SR all the way. I have always liked the SR heads.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Build me a 9.80 512 low deck
[Re: fast68plymouth]
#2263638
03/05/17 01:15 PM
03/05/17 01:15 PM
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Joined: Jul 2010
Posts: 2,422
Pittsburgh PA
Eric
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,422
Pittsburgh PA
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How I'd do it....
-Indy SR CNC 295's, PRH prep(355cfm)
-Indy 400-3 intake
-4500/1050 carb
-2" headers
-.650-.700 lift easy on parts roller cam
-1.5 HS rockers
-flat top pistons(12:1 with 78cc heads)
-import crank and 6.535 rods of your choice
Should be an easy 750hp depending on exactly what you did with the cam.
You could use 440-1 CNC 325's for about $700 more, most of which is the added cost of the offset rockers(which is the main reason I suggested the SR's in the first place).
. Other than the cam....pretty much my motor 👍
5.53 @ 125 1/8th on the launch control..more left in her!
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