SB Chevy 427 Stroker 759 HP Race Engine AFR 235 Heads

[josh22784lori30]

what was the comp ratio and fuel used for this pull thank you.

[cncmotorsports]

@josh22784lori30

Compression was about 14.0:1, we used VP C12

[sukajoe79]

I bought a Motown block to build my SB 427, are these blocks worth building?

[MrNBowden]

@cncmotorsports hi, I was wondering how much something like this would cost and where are you guys located?

[cncmotorsports]

@MrNBowden

Price starts at $13399.95, we are located in Brookings, South Dakota

[eagle275]

what block did you use? Looking @ using a Dart SHP 400 block.

[cncmotorsports]

@eagle275

This Engine build we used the Dart Little M blocks

[cncmotorsports]

@eagle275

This Engine build we used the Dart Little M block

[eagle275]

Gotta get one of these!



[robbedoes1985]

how much does the engine weigh like its on the dyno without the headers ?

[cncmotorsports]

@robbedoes1985

I'm guessing around 550 pounds

[pontiacpower455]

Which is the specs of the cam to use?? thanks

[cncmotorsports]

@pontiacpower455

Cams specs are confidential.

[chad1068]

@pontiacpower455 I'll give you cam specs for a 433 that made 35 more HP and 27 up on TQ. 795/640. The main gain will be in the cylinder head. We used the all pro 23 degree spread port head fully ported by Clements Porting Service. Lift: 760 Int. / 715 exh Duration: 282 Int @ .50 / 292 Exh @ .50 110 / 107 CL. We left some gains in our cam selection in order to create a reliable lap motor. We did use the good stuff callies, JE, all pro, SPD etc. so this 427 is definatley respectable.

[looker195772camaro]

@chad1068 " so this 427 is definatley respectable" Yes it is. Cnc Motorsports ROCKS and I am the very proud owner of this respectable 427

[chad1068]

@looker195772camaro So is this motor going in a street strip application or ? I would be curious to know what your compression is and what the power band looks like from 3000 to 8000. Ours built 702HP @ 3200 and peak (790 HP) @ 7200. Torque was flat above 625 from 3000 to 7000 with peak torque (640) @ or around 6000. We dyno'd the same motor with a sheet metal dual carb setup and gained approx. 55-60HP (843). I understand your enthusiasm CNC built you a nice, respectable 23 degree power plant!

[chad1068]

@looker195772camaro Scratch that last post, I seen the power band and compression ratio on the video. Nice motor!

[looker195772camaro]

I really love my engine you guys really do rock over there

[cncmotorsports]

@looker195772camaro

Have you had it to the track yet ?

[looker195772camaro]

@cncmotorsports I wish I could say yes.....but due to my mother being so ill this year i've not been able to get out. Sad to say, big disappointment to my other half and me. We so want to see what she'll do. But we will get her out next year and when we do you'll see the video of her going down the track.

[cncmotorsports]

@looker195772camaro

Sounds good. Hope your mother is doing well.

[looker195772camaro]

@cncmotorsports April 9th is a good date track opens and lol it is my birthday

[GOON1991]

Would this 427 small block fit into my 87 buick grand national? if so you just found yourself a customer let me know please!!!

[cncmotorsports]

@GOON1991

Yes, this engine will fit into your 87 Buick. You will have to make a few small changes, but for the most part it's all good. You will need to upgrade your transmission for a Turbo 400 or power Glide.

[MrMurphy1025]

what would this short block cost me?

[cncmotorsports]

@MrMurphy1025

Give us a call, 800-341-1528 ask for Chris or Jason

[MrMurphy1025]

also, i have a ported weiand tunnel ram and a pair of holley 660 center squirt carbs that were custom built by keith dillard of lonestar motorsports. i was planning on building a 383, but im thinkin these heads of mine would work better with a little more cu. inches. keith even told me the 383 should make around 700hp with no problems. id like your opinion. thanks, clint murphy

[cncmotorsports]

@MrMurphy1025

Your heads would work much better with a 415 or 427. As for power, this is anybodys guess. To many factors involved. With the head CFM you should be able to make 700 HP with a 415 or 427 with the right camshaft.

[MrMurphy1025]

@cncmotorsports can you point me in the right direction with cam shaft choice? i know its anyones guess, but where should i start as far as lift and duration at .050" ? just a guesstimate to start with ya know? thanks for your info man.

[cncmotorsports]

@MrMurphy1025

I would do a camshaft in the 260 duration range at 50, try to get upper .680 to .700 lift, you may want to to a 1.6 intake and 1.5 exhaust, or even 1.7 intake and 1.6 exhaust. Lobe separation 106 or 108 would be fine. Depending on your low lift flow you may want a tight lash cam. All this depends on how much compression you are going to go with, but this is a good start.

[MrMurphy1025]

@cncmotorsports can i build a 421 with flat tops in in and still make around 13:1 , 13:5 compression with 64cc cumbustion chambers? im worried about the piston to valve clearance.

[cncmotorsports]

@MrMurphy1025

You have less piston to valve clearance if you use flat top and try to get 13.0:1 compression. Put a dome piston in it to make compression.

[MrMurphy1025]

@cncmotorsports well its gonna be a few more months, but im gonna get you guys to build my short block.

[cncmotorsports]

@MrMurphy1025

Great, just let us know when your ready.

[MrMurphy1025]

@cncmotorsports how do you feel about running a belt drive over a timing chain on the street?

[cncmotorsports]

@MrMurphy1025

We use them both. Timing belt is much more expensive, but they look cool.

[MrMurphy1025]

@cncmotorsports i was just concerned about the issue of durability with street use ya know what i mean?

[MrMurphy1025]

hi, im itchin to build a 421,427sbc motor. i have a set of 1st gen dart iron eagles that were ported by kenneth abbott of abbott racing heads in crane tx. they are 230cc with 64cc chambers, 2.08, 1.60 valves. kenneth told me the heads flow 315-320cfm at .700" of lift. i would like to run 13:1 to 14:1 compression. what kind of power do you think i can make? how much lift can i get away with before a valve hits a piston?

[MrMonteCarloRacing]

I appreciate all your comments and suggestions. We all realize, "bigger is not better" but Money makes power. Im broke , so I have to make every part count in my combo.

[cncmotorsports]

@MrMonteCarloRacing

I understand your situation, good luck with your build..

[MrMonteCarloRacing]

I knew the cam was too big . I have a set of brodix Track 1 heads on my 406.....without even knowing the flow numbers I'd be willing to bet that the Brodix heads make more power than the Pro Topline heads. Im also thinking of going to a 110 lobe center instead of the 107.

There is a guy up here with a 454 small block, Brodix 18 degree heads, Solid cam , not a roller making RIDICULOUS power

[cncmotorsports]

@MrMonteCarloRacing

Yes, your track 1 heads might not be bad if you already have them. 110 lobe center is not a good idea..

[MrMonteCarloRacing]

Ive been looking at fifferent carbs as well as other heads. I looked at Brodix 18 degree heads.......they make power but cost a LOT. Afr 235's are also good. The gas i run is 110 octane..timing is at 38 degrees.

[cncmotorsports]

@MrMonteCarloRacing

AFR 235s are 2 big and 38 degrees of timing is to much.

Bigger is not better. We make 600+ HP with 255 degrees of duration camshafts on world products sportsman II 200cc heads in 355s all day long. There is a balance between these parts that you must follow in order to make good power. The biggest mistake people make is buy the biggest cams heads and bolt them on. I would put a smaller 255-263 duration cam in there, with AFR 220 CNC ported heads and port match the intake.

[MrMonteCarloRacing]

on the 8th pull it made 586 h.p @ 6500 and 549 torque @ 5000. The hearders are SMALL on the dyno we stepped up to 1 7/8 but Until I can buy some custom made, they are only 1 5/8 to fit the body.. I just blew a head gasket and its time to make some changes for sure.

[cncmotorsports]

@MrMonteCarloRacing

Yah, it sounds like the camshaft is really lazy and the heads are lazy as well..

The 1 5/8 headers will restrict the performance. With a cam of that size you can easily make 720 on good gas if not more. Also the Race demon, not a big fan of them. First thing is blue print everything, cc the heads, check the dome volume, deck clearance, get the exact compression ratio. Then i would have the heads flowed o na flow bench to see where they are at. All it takes is one bad piece

[MrMonteCarloRacing]

its actually Weisco 13.5:1 compression.The heads are 23 degree, purchased 3 years ago. I think they have 220 intake runners. I had an 830 Holley on it..Yalked to Barry Grant....he recommended a Demon Race 750..that made a big difference. Cam Specs 278 Int 290 Ex. 107 lobe. List is .682 int. 640 Ex. Lunati Roller. We had it on the dyno...went from the 750 to a 1050 Dominatpr and only picked up 9 h.p. I think the cam is WRONG . Intake is Brodix Hp 1000

[MrMonteCarloRacing]

Ive got a 14:1 421 small block. Roller cam Pro Topline heads. The thing only made 609 h.p. on the dyno..I need to go to AFR heads or Brodix..and the cam is definately wrong. I was hoping to see close to 700 h.p. Its in my 70 Monet that weighs 3850 lbs. my best run on the motor was only 11.57 so something is wrong with the combo. Any suggestions ?

[cncmotorsports]

@MrMonteCarloRacing

Wow, something is way wrong, are you sure it's a blue printed 14:1 compression ?

The pro top line heads, are they old versions ? do you have any flow numbers ? what are your cam specs, and what intake and carb are you using.

[magnum9987]

Thats weird. never seen a small block stroker make that much power. Or is that running on Race Fuel?

[cncmotorsports]

@magnum9987

Yes, this is a 14.0:1 race engine running on race fuel.

[MrGstock]

A fuckin +

lol

[cncmotorsports]

VP113 Fuel

[710southLongBeach]

what kind of gas are u running with this engine?

[cncmotorsports]

We used Sunoco Supreme, then the final tune was done on VP oxygenated fuel.

[curtish1966]

wat is the rpm range... and do u think that 227cc afr heads will be too big for a 400cid small block chevy... i'm gonna run as much compression as possible without changing pistons the pistons are flat tops with 64 cc combustion chambers and the block has been decked and i'm thinking bout shaving the heads to give a little more compression for the custom cam i'm going to have ground... solid lift roller cam vic. jr. intake just your thoughts

[cncmotorsports]

Use the AFR 220 heads, this will make much better over all power than the 227 heads will. The 227 heads will take a custom piston for the valve spacing.

[redlineoryourmine]

Nice work Ryan on running her hard. i have been waiting to see that motor since i was there for my 327

[cncmotorsports]

We want 800 on the next one...

[cncmotorsports]

Give us a call 800-341-1528

[r3dn3cksn1p3r]

omfg sick.....

[rickavery34]

how much

[cncmotorsports]

$14,500 for the same exact one

[joefacc]

How big is the cam? These heads flow really good past .700 lift. How many days did you spend grinding for pushrod clearance? :o) I think it took me about 3 days of grinding to get the Jesel Pro System to fit. Motor sounds great!!

[cncmotorsports]

We have a carbide cutter for a head machine, takes about 15 minutes to open up the push rod holes. Can't give the exact cam specs, but was in the upper .670 lift range this motor has 30-40 more HP left in it.

[v8nutta427]

Nice work guys.

[cncmotorsports]

Thank you, we were very happy with the way this engine turned out.