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Discussion Starter #1
Thought I'd toss this out and see what others may have done. Planning a new build in the future and according to the calculators I need 450-475hp for my goal.
Limitations
10.8 11-1cr
Flat tappet cam
7000 rpm max
motor will have 5.7 rods & flat top pistons
Considering a set of 200cc Pro 1 heads
I have a 9"ATI converter that flashes 4500 with the current 9.5cr 406
 

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Discussion Starter #4
Maybe I should rephrase my goal. I'm going 11.30-11.50 now with the 9.5 motor, a Comp 292 flat hyd cam, out of the box Sportsman II heads, Victor Jr and a 750 DP. I'd like to get it solidly in the mid to upper 10s with the next build.
 

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Let the Clutch Out
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No Smaller than a AFR 235 or Something like it , Call one of the cam Guys on here for a Cam ie Cam King (Mike Jones) Straub Technologies (Chris Straub) ETC ETC ETC. Good Intake with a little Port work . should run Real Good
 

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Should be fairly easy. The 406 I just finished up made 643 hp at 6500/ 580 ft lbs at 5400 with a little 780 carb on 93 octane Friday. It is a small solid roller but only 11.2:1 & AFR 220 heads. They are the cheaper "race ready" version, box stock except for opening up the pinch about .030".
 

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Should be fairly easy. The 406 I just finished up made 643 hp at 6500/ 580 ft lbs at 5400 with a little 780 carb on 93 octane Friday. It is a small solid roller but only 11.2:1 & AFR 220 heads. They are the cheaper "race ready" version, box stock except for opening up the pinch about .030".

WOULD LOVE TO SEE MORE INFO ON THIS BUILD

AM IN THE PROCESS OF FRESHENING MY STOCK 509 BLOCK 406

HAVE CP FLAT TOP PISTONS AND 6"RODS 3.75 EAGLE CRANK, DART PRO1 PLATINUM 215 64CC HEADS ALONG WITH 2925 MANIFOLD, CLEANED UP 300-25 INTAKE, AND A HIGHLY MODDED BOWTIE INTAKE ALSO.

REALLY CAN T DECIDE ON A CAM

GONNA GO INTO MY 3600LB WET CAMARO

TH400, 4200 CONVERTOR AND 4.11 REAR

CAM CAN BE SOLID ROLLER

WANT IT TO BE EASY ON THE VALVE TRAIN

WANNA GET THIS POS RUNNING MID 10 SEC 1/4'S

CHEERS
 

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4 Bolt GM block - 0.030 over.
Factory 400 crank.
Eagle 5.7 rods.
10.7 comp.
TRW forged pistons. ( bottom end assembled in 1998 ).
AFR195's ( street version ) untouched. 1.5/1.5 rockers.
242/[email protected] Comp Cams hydraulic roller - 0.550 odd lift.
Super Victor - tidied plenum & matched to ports.
1" open spacer.
830DP Holley.
1.75" primary, 3" collector headers, 3" Hooker Aerochambers.
9" x 4000stall converter.
Turbo 400 with modified valve body.
3.73 12 bolt posi with 26" tall ET Drag Radials.

Never had it on an engine dyno but on a chassis dyno when it was jetted very lean it made 400RWHP.

I run it in my 68 Firebird - 3350lbs.
Best so far has been 11.08 @ 121.5mph.
 

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WOULD LOVE TO SEE MORE INFO ON THIS BUILD

AM IN THE PROCESS OF FRESHENING MY STOCK 509 BLOCK 406

HAVE CP FLAT TOP PISTONS AND 6"RODS 3.75 EAGLE CRANK, DART PRO1 PLATINUM 215 64CC HEADS ALONG WITH 2925 MANIFOLD, CLEANED UP 300-25 INTAKE, AND A HIGHLY MODDED BOWTIE INTAKE ALSO.

REALLY CAN T DECIDE ON A CAM

GONNA GO INTO MY 3600LB WET CAMARO

TH400, 4200 CONVERTOR AND 4.11 REAR

CAM CAN BE SOLID ROLLER

WANT IT TO BE EASY ON THE VALVE TRAIN

WANNA GET THIS POS RUNNING MID 10 SEC 1/4'S

CHEERS
It's nothing special, 11.2:1 comp, 6" rod, .045" piston to head. Heads are the "race ready" (cheaper) version AFR 220cc Eliminator that advertise about 10 cfm less than the "Competition" version that's $400 higher. Only thing I did to them was open up the pinch about .027". Didn't clean up the bowls, short turn or any CNC marks intake or exhaust (except of course at the pinch). Chambers are untouched (advertised 65cc measured 66). Honed with plates & a good smooth plateau finish. Intake is 300-25 port match & light plenum cleanup. Solid roller by Mark at Bullet.

Best peak numbers were with 1" hvh super sucker spacer, but best average was w/o spacer & torque was up 20 ft lbs at 4200 over numbers with spacer & was only down 6 hp at 6500. Run on the dyno on 93 octane at 34 total locked out. 3923 plugs showed a bit hot & some slight specs although it looked to be too lean to me, but going to drop to a 3922 & mix some race fuel in the buggy just to be safe. Average water temp of the pulls was about 170-175.

I think it could have peaked a little better with some jetting changes (only adjustments were timing & spacer) since it was a little lean, & also I think more carb may have helped a bit, but it's already making more than I'm comfortable with on this block. I didn't have the heads flowed, but judging by the way people criticize the AFR heads, I would think your heads would be at least as good if not better.

I really was only expecting 580-600 on this deal, & about 550 torque due to the wide LSA, which was necessitated by the ez-efi we are going to run on the buggy. We were told by FAST that the MAP sensor requires a minimum of 9" of idle vacuum. It pulled 13.5" on the dyno at 1150rpm with the timing locked out at 34*, & even pulled about 11.5" using mechanical advance with 13* initial, so we probably could have gotten away with at least a 110* LSA if not 109*. The torque is a little low under 4500 rpm to suit me, but above that is very stout, nice & flat over a broad rpm range. Hoping the EFI will help the torque below 4500 & I'm going to loosen up the lash a bit also if needed.
 

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I realize you said 406 but this 383 ran well and you should do better with the 4-1/8 bore.Scat rotating assy . No trick parts . Flattop piston . 4.030 383 w 6in rods . 3.75 stroke. AFR 227 heads Supervic with portmatch. 250s @.050 .600" lift solid roller . 4.30 gears . In a 3000pd car in 8000 ft of D/A in Denver it ran best of 10.54 at 126 on pump fuel. Later ran 9.35 on a 65 nos jet still on pump fuel . A similar 406 even with a hyd roller should easily meet your goals in near sea level air
 

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Maybe I should rephrase my goal. I'm going 11.30-11.50 now with the 9.5 motor, a Comp 292 flat hyd cam, out of the box Sportsman II heads, Victor Jr and a 750 DP. I'd like to get it solidly in the mid to upper 10s with the next build.
So is the next build a new motor or is it a rework of this motor?
What's your budget?
How heavy is the car incl. driver?
 

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It's nothing special, 11.2:1 comp, 6" rod, .045" piston to head. Heads are the "race ready" (cheaper) version AFR 220cc Eliminator that advertise about 10 cfm less than the "Competition" version that's $400 higher. Only thing I did to them was open up the pinch about .027". Didn't clean up the bowls, short turn or any CNC marks intake or exhaust (except of course at the pinch). Chambers are untouched (advertised 65cc measured 66). Honed with plates & a good smooth plateau finish. Intake is 300-25 port match & light plenum cleanup. Solid roller by Mark at Bullet.

Best peak numbers were with 1" hvh super sucker spacer, but best average was w/o spacer & torque was up 20 ft lbs at 4200 over numbers with spacer & was only down 6 hp at 6500. Run on the dyno on 93 octane at 34 total locked out. 3923 plugs showed a bit hot & some slight specs although it looked to be too lean to me, but going to drop to a 3922 & mix some race fuel in the buggy just to be safe. Average water temp of the pulls was about 170-175.

I think it could have peaked a little better with some jetting changes (only adjustments were timing & spacer) since it was a little lean, & also I think more carb may have helped a bit, but it's already making more than I'm comfortable with on this block. I didn't have the heads flowed, but judging by the way people criticize the AFR heads, I would think your heads would be at least as good if not better.

I really was only expecting 580-600 on this deal, & about 550 torque due to the wide LSA, which was necessitated by the ez-efi we are going to run on the buggy. We were told by FAST that the MAP sensor requires a minimum of 9" of idle vacuum. It pulled 13.5" on the dyno at 1150rpm with the timing locked out at 34*, & even pulled about 11.5" using mechanical advance with 13* initial, so we probably could have gotten away with at least a 110* LSA if not 109*. The torque is a little low under 4500 rpm to suit me, but above that is very stout, nice & flat over a broad rpm range. Hoping the EFI will help the torque below 4500 & I'm going to loosen up the lash a bit also if needed.

have you got or are willing to divulge the cam specs

i was thinking of running the comp cam xr292r extreme roller in this combo

anyone's thought on this stick??
 

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.060 511 block, studded, line bored.
Stock GM 400 Crank
Stock GM 400 rods, resized with arp bolts
TRW heavy forged domed pistons milled down to a .125 dome
Box Stock Dart 215's
Professional Products Hurricane match ported to heads, nothing done to plenum area
Crower 00502 Roller Camshaft
Quick Fuel 750 dp

This was my old street engine, ran on pump gas with no problems. It also had a plate system on it. Ran 110 race fuel when I would spray it though.

In a 3200 lb first gen Camaro, on a 200 shot on 275's 5.80 @ 121.

Ran this motor for over 10 years on the street, freshened it, and sold it to a bracket guy about 6 years ago, who as far as I know is still running it n/a to this day. Never ran it N/A myself, but I figured it was pushing close to 600 or a little more, on motor.
 

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Discussion Starter #16
OP

Why flat tappet? Cost
Yes. Plus I can't personally justify it for the RPM and goal.

Yes this will be a fresh build if it happens. The current motor is well built, balanced and very consistant. I prefer to leave it whole as a spare. I will most likely leave it in next year and work on my driving. I have several good GM blocks to chose from for another engine.

I haven't weighed the truck. It should be about 3000-3100 with me in it.

This is something I'll spread out over time so the budget isn't a fixed thing. Having said that I'm always looking for ways to save money mostly by doing the work myself and saving on parts where I can.

Thanks for the combos. Keep em coming.
 

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have you got or are willing to divulge the cam specs

i was thinking of running the comp cam xr292r extreme roller in this combo

anyone's thought on this stick??
.4265"/.4265" lobe lift (we are running 1.6 rocker) 285/293 253/258 @ .050" 174/176 @ .200" 111 LSA in at 106.5 we have only .634"/.638" net lift at .020" lash, lost .024"-.028" to deflection
 
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