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Old 10-18-2009, 05:22 PM   #1
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need some expert opinions on 427 SBF build

So, it's been a while since I last visited, but I have a new project in mind and need some opinions.

First, I have been shopping around for a 427 small block for a new project car and have decided to purchase a CHP Pro Street short block. I would love to have a Dart or World block, because I'm kinda overkill, but I really dont need it for this project.

The pro street is a bored/stroked production 351W with a forged rotating assembly, good for 800hp... this is more than enough for me.

I am planning on installing a lunati voodoo cam, Part # 61012, Lift: 0.571 Int / 0.587 Exh, Duration: 231/239 at 050, LSA: 112, ICL: 107. Again, I'd like to use a little bit more agressive profile, but would like the car to be some what streetable (gentle enough for a weekend cruise, but great at the track).

My question right now is what heads to run... specifically what size intake runner? I've been batting around the idea of some RHS 210's or 225's, also TFS Twisted Wedge 205's, and of course AFR's.

This will be my first big c.i. small block, so I could definitely use some ideas, but my goal is 650 at the wheels.

Just to help... I'm planning on running a Trickflow R series manifold (not the box R) for 5.8L, a 90mm throttle body, and eventually adding a 150 shot of nitrous.

All opinions are welcome. Thanks in advance.
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Old 10-18-2009, 05:37 PM   #2
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If going CHP, why not talk to them and see about a whole long block to meet your needs? I run a custom CI cam currently which is more aggressive than you have posted and it drives OK at 1500, and really good above 2000, and idles at about 800.
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Old 10-18-2009, 05:44 PM   #3
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A stock 351 block punched out to a 427???? Doesn't sound safe.
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Old 10-18-2009, 06:00 PM   #4
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Quote:
Originally Posted by Stopsign32v View Post
A stock 351 block punched out to a 427???? Doesn't sound safe.
4.030"x4.170" is pretty common I believe. Mine is a Dart blocked 4.125"x4.0.
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Old 10-18-2009, 06:37 PM   #5
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Have u looked at the new Dart SHP block for $1800? or the new 351 Boss block? If still out of ur price range look at a 69-74 351W block.

IMO, don't use the standard CHP forged crank which is a RPM. Go Scat 4340 and Probe 4340 I beam rods w/ 7/16 rod bolt or Scat pro series 4340 I beams, Probe or ross pistons, Romac ultralite damper and aluminum flywheel, this will allow it to spin up real fast, neutral balanced, hellfire ring set, clevite H-series rod and main bearings, canton 7qt pan.

a 427 IMO, needs at least a 225cc head, and not RHS. TFS Hi-port 225 cnc'd, TFS-R 225 cnc'd or even a TFS-R 235 from TEA. I would also look at a super victor lower intake and a CHP elbow AND a custom cam, not the cam u have listed.

u could also compare the 427 crate race motors Bennett Racing and Keith Craft racing have on their websites to give u an idea of what a 427 looks like inside.
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Last edited by strker347; 10-18-2009 at 06:42 PM.
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Old 10-18-2009, 07:57 PM   #6
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my old 408 pulled about 500 or so rwhp, it was a pump gas 10.5:1 engine but we stuff a lunati small solid roller 51019 248/256 and we ran stock tw "R" heads. It was really to big to be called everyday streetable but its the only way I'd think your going to get the 500rwhp. 500hp is going to take an agressive setup, the 427 will help with more torq so will the extra hp's. The 408 was a stock 1970 block and was starting to walk the caps around a little the dart would just be insurance.
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Old 10-18-2009, 08:18 PM   #7
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just to clear up any confusion...

the pro-street 427 is a 4.170 stroke x 4.030 bore.

it comes built with the following:

Probe Industries SRS Forged Pistons
Probe Industries Forged 4340 Steel Crankshaft
Probe Industries H-Beam Connecting Rods
Clevite Perfect Circle Rings
Clevite 77 Main P-Bearings
Clevite 77 Rod P-Bearings
Fully Machined and Inspected Factory Block
Balanced
Blueprinted

Running a -4.0cc flat top piston with 64cc chambers the compression is 12.10:1
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Old 10-18-2009, 08:25 PM   #8
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If you are going to stay stock block go with a 4" crank.

I have a set of 215 cc TW done by Et perfromance for sale. These heads just went 10.08 133 on a dart block 9.8-1 428 Very mild hyd roller.

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Old 10-18-2009, 08:39 PM   #9
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Yamaha - How does your 428" run? You have the Pro-Comp heads right? Can't remember if you "loved" or "hated" those hotly debated heads.

Brandon
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Old 10-18-2009, 08:46 PM   #10
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OP - Stick with a short runner intake. Don't mess with the long runner intakes on a big windsor stroker. Buy Gray86hatch's heads and he will cut you a deal on an intake elbow to fit.....

Don't mess with a 427 either. The 4" stroke is ideal. The "427" Windsor is mainly used buy nostalgia guys and people who want the cubes "on the cheap".

A properly setup 408 w/ good heads and matched parts will be "on the edge" with 150 shot of nitrous on a factory production block. I don't care what anyone says. I've seen what happens to the main bearings and caps once things start moving around at 600 HP....

My last tidbit of advice - Do it right the first time.
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Old 10-19-2009, 07:11 AM   #11
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As mentioned, to get 500 rwhp n/a is going to take a well matched combo.

I run a 4.17 stroke 4.030 setup and have used both Canfield 192s and current AFR 225 heads. Granted I did not have a cam matched to the compression and cubes, but it wasn't too far off. Went 6.47@106 in the 1/8 at 3050 lbs weekend before last. That would be about a 10.12 around 130 or so.

Compression was 11.3:1 with -22 dish and 54cc chamber.

I pulled the motor the next day and we inspected the bearings, everything looked perfect. I have a Probe main girdle on it to help prevent cap walk. Motor was shifted at 6700-6800 with the 225 heads.
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Old 10-19-2009, 07:41 AM   #12
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White90GT, take some weight off and that car will be moving out! 6.20s are in ur grasp.
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Old 10-19-2009, 07:55 AM   #13
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Quote:
Originally Posted by cerecke View Post
Yamaha - How does your 428" run? You have the Pro-Comp heads right? Can't remember if you "loved" or "hated" those hotly debated heads.

Brandon
I have not had any problems since all the original problems were addressed with the Procomps. The car runs good and would be better with a good driver

The 123.35mph, with a vehicle with driver weight of approximately 3200, works out to 469 rwhp which is right at what Jay Allen predicted and what it dyno'd at during initial tuning.

I have a set of TEA 240 Highports, port matched EFI Super Vic, and a custom solid roller waiting to go in though.
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Last edited by YamahaGuy; 10-19-2009 at 08:02 AM.
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Old 10-19-2009, 08:43 AM   #14
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Quote:
Originally Posted by YamahaGuy View Post
I have not had any problems since all the original problems were addressed with the Procomps. The car runs good and would be better with a good driver

The 123.35mph, with a vehicle with driver weight of approximately 3200, works out to 469 rwhp which is right at what Jay Allen predicted and what it dyno'd at during initial tuning.

I have a set of TEA 240 Highports, port matched EFI Super Vic, and a custom solid roller waiting to go in though.
You went big bore - 4" stroke - cleveland mains right? How much RPM are you running? We're running my 428" up to 7K.
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Old 10-19-2009, 02:03 PM   #15
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Quote:
Originally Posted by cerecke View Post
You went big bore - 4" stroke - cleveland mains right? How much RPM are you running? We're running my 428" up to 7K.

This thread has been officially hijacked. Yes. 4.125" with cleveland mains. Only turning 6100ish with current setup, but with the new will be running in the 7k range.
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Old 10-19-2009, 06:13 PM   #16
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Quote:
Originally Posted by Nutzz View Post
White90GT, take some weight off and that car will be moving out! 6.20s are in ur grasp.
Actually on that pass I had 150 lbs of weights in the trunk trying to slow it down to 6.60 for an index class. I didn't run that night without the weight although I should have. That was the last outing for that motor in my car. It was pulled the next day and is being freshened up for the buyer. I am building a dart based 434ci setup with new FTI cam.
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Old 03-28-2010, 10:06 AM   #17
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back to the point

Go for a better block with a 4.125 bore. If you want big displacement and reliability you can't go wrong. I also think you can run under 11:1, a cam smaller than .600 lift, a vic jr intake, and the RHS heads and still get 500hp at the crank. If you want to get the best numbers at the track go nuts. If you want to get the most out of TFS 235cc heads you need a .700+ cam, and you are going to get nervous if you get stuck in some traffic.
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