can someone desktop dyno please. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OLDCHEV4X4 · 07-29-2003, 05:45 PM

I built a motor a while back and was wondering how much HP i have.
350 .030 over
10 to 1 compression
TRW forged pistons
GM PM rods
GM steel crank
Balanced and Blueprinted
492x heads(with accessory holes..hehehe)
1.94/1.50 valves
roller timing chain on zero degree
1970 LT1 aluminum intake 3972116
Lunati bracket master hydraulic cam
224/224 @ .050 duration
.460/.460 lift
GM windage tray
Road demon 625cfm carb.
Headers
GM HEI ignition with 53,000 volt coil
I built this motor to do 100 yard dirt drag racing. The more aftermarket stuff you add on the higher the class your in. So i tryed to make a specd out 72 LT1. I couldent find all the exact specs for a 72 LT1 but I think i got real close.
Thanks for any help or spec info.
Randy

lukecp · 07-29-2003, 07:04 PM

Using a flow file for stock 462 double hump heads, you get:
337hp @ 5000rpm and
390 ft. lbs. @ 3500

OLDCHEV4X4 · 07-29-2003, 07:12 PM

Thanks Lucas.
Whats a flow file?
And does the x heads make a difference? I think they had 10cc more size on the intake runners.
Randy

lukecp · 07-29-2003, 08:51 PM

A flow file is a desktop dyno file for the amount of air a cylinder head will flow at various levels of valve lifts. For example, the 462 head will flow 167 cfm @ .300 inches of valve lift through the intake port. The 492x heads will proably flow a tad bit better because of the 10cc larger intake port, and more flow=more power

.

smokekiki · 07-30-2003, 07:56 AM

Hey,Randy,where are You dirt dragging?

OLDCHEV4X4 · 07-30-2003, 04:36 PM

Hey Mike,
I raced at Kempton fair this year.(north of Kutztown) And in Jersey Shore PA.(west of Williamsport). And at Line Mountain Race Track south of Sunbury.
Its set up just like asphault drag racing, except its on loose dirt and its 100 yards long. Its alot of fun.
You should bring your yellow blazer out and try it.
I had some weak valve springs so i changed them. So 600 miles lator my cam is wiped out. Thats OK, I have this motor that was going in my shortbed, now its going in the Blazer..
Randy

Let me know if you want to go.

07-29-2003, 05:45 PM	#1
OLDCHEV4X4 Registered User Join Date: Apr 2000 Location: Chester County PA, USA Posts: 1,228	can someone desktop dyno please. I built a motor a while back and was wondering how much HP i have. 350 .030 over 10 to 1 compression TRW forged pistons GM PM rods GM steel crank Balanced and Blueprinted 492x heads(with accessory holes..hehehe) 1.94/1.50 valves roller timing chain on zero degree 1970 LT1 aluminum intake 3972116 Lunati bracket master hydraulic cam 224/224 @ .050 duration .460/.460 lift GM windage tray Road demon 625cfm carb. Headers GM HEI ignition with 53,000 volt coil I built this motor to do 100 yard dirt drag racing. The more aftermarket stuff you add on the higher the class your in. So i tryed to make a specd out 72 LT1. I couldent find all the exact specs for a 72 LT1 but I think i got real close. Thanks for any help or spec info. Randy __________________ 72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania

07-29-2003, 07:04 PM	#2
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Using a flow file for stock 462 double hump heads, you get: 337hp @ 5000rpm and 390 ft. lbs. @ 3500 __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

07-29-2003, 07:12 PM	#3
OLDCHEV4X4 Registered User Join Date: Apr 2000 Location: Chester County PA, USA Posts: 1,228	Thanks Lucas. Whats a flow file? And does the x heads make a difference? I think they had 10cc more size on the intake runners. Randy __________________ 72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania

07-29-2003, 08:51 PM	#4
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	A flow file is a desktop dyno file for the amount of air a cylinder head will flow at various levels of valve lifts. For example, the 462 head will flow 167 cfm @ .300 inches of valve lift through the intake port. The 492x heads will proably flow a tad bit better because of the 10cc larger intake port, and more flow=more power . __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

07-30-2003, 07:56 AM	#5
smokekiki Mike Join Date: Jan 2003 Location: west chester pa Posts: 2,473	Hey,Randy,where are You dirt dragging? __________________ 70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires

07-30-2003, 04:36 PM	#6
OLDCHEV4X4 Registered User Join Date: Apr 2000 Location: Chester County PA, USA Posts: 1,228	Hey Mike, I raced at Kempton fair this year.(north of Kutztown) And in Jersey Shore PA.(west of Williamsport). And at Line Mountain Race Track south of Sunbury. Its set up just like asphault drag racing, except its on loose dirt and its 100 yards long. Its alot of fun. You should bring your yellow blazer out and try it. I had some weak valve springs so i changed them. So 600 miles lator my cam is wiped out. Thats OK, I have this motor that was going in my shortbed, now its going in the Blazer.. Randy Let me know if you want to go. __________________ 72 k/10 short wideside 72 k/5 Blazer 72 K/5 Blazer - obstacle course racer 72 custom/10 8' bed 70 K/5 Blazer 67 C-30 GMC Flat bed 86 GMC K2500 Plow Truck 85 GMC K3500 84 M1008 85 M1008 77 G30 Motor Home 72 Sears 12hp Tractor Glenmoore, Pennsylvania



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