Check my combo,please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ont67shortbox · 02-19-2009, 10:34 AM

Could someone give me some TRQ/HP numbers and a estimated 1/4 mileET please,here is the combo.

427 .030 over
TRW forged pistons .250 dome
Chev *241* oval port/open chamber heads 113cc
approx 10.6 comp
bowl work,gasket match
2.25/1.88 stainless valves
Comp solid FT 282s cam 2400-6800 rpm
244/252@.050
.590/.598 lift
Edelbrock RPM Intake, gasket matched to heads with 1" spacer
Modified 750 dp Holley
2 inch Hooker super comps/3 inch exhaust
built 350 turbo trans
Neil Chance 9 1/2 3500 stall convertor
F*rd 9 inch 4.30 gear
31 x13x15 tire
67 short box pickup weight approx 3800lbs
lowered 4 1/2F 6 R trailing arms/coil springs
block is at machine shop being cleaned,now is the time for me to adjust my combo if you think its needed,Thanks for your help

bigjimzlll · 02-19-2009, 10:42 AM

12.80 in da 1/4..just a wild azz guess though. I'm not familiar with that head casting or how much "work" has been done to them.
I think the gear,tire and cam are just about matched for the engines RPM band.
I would guess a real world 420 or so HP

Look at the old L88 427's with 12-1 CR a solid cam and dual quads made 430 HP.
Sounds like a fun combo.

Wild83C10 · 02-19-2009, 11:15 AM

Need more head info and what kind of intake? If the heads flow enough I think you should run better then 420hp and 12.40s.

Check out this thread and post your info in there. More head and intake info would help though.

http://67-72chevytrucks.com/vboard/s...d.php?t=317628

**americanmusc1e** · 02-19-2009, 06:07 PM

My desktop Dyno Says about

562hp @5500 and 583ft-lb @ 4000

wasn't sure about the heads so i used Edelbrock performer heads for a baseline.

a much bigger set of heads like Victor CNC show about

605hp @ 6000 and 599 @ 4500

bigjimzlll · 02-19-2009, 09:07 PM

If you noticed I said real world HP numbers. I have nothing against desk top dyno programs if you use them to track trends. It has been my experience...having built and dyno'd a few engines.... making over 1 HP per cubic inch is not as easy as magazines make it look. If it was the big 3 auto makers would of been doing it all along.
If you think about GM's 454 in the late 70' early 80's made barely over 240 HP.
My full race 540 males 840 HP...thats 1.55 hp per cubic inch
The 427 at 605 HP is 1.4x per cubic inch. Out of a pump gas truck engine?

**americanmusc1e** · 02-22-2009, 09:11 AM

Quote:

Originally Posted by bigjimzlll

If you noticed I said real world HP numbers. I have nothing against desk top dyno programs if you use them to track trends. It has been my experience...having built and dyno'd a few engines.... making over 1 HP per cubic inch is not as easy as magazines make it look. If it was the big 3 auto makers would of been doing it all along.
If you think about GM's 454 in the late 70' early 80's made barely over 240 HP.
My full race 540 males 840 HP...thats 1.55 hp per cubic inch
The 427 at 605 HP is 1.4x per cubic inch. Out of a pump gas truck engine?

yeah i thought that was a little high myself but i just checked it for a baseline, somewhere i heard that Desktop dynos are about 20 percent off on HP and 10 percent off on tourque but i'm not sure

Wild83C10 · 02-19-2009, 09:26 PM

The desktop dynos are a bit on a high side usually. The best thing to use them for is to compare parts. Will changing the cam give you the results you want? That is what the desktop dynos are good for.
I have one of the better desktop dynos and I have every single bit of info for my motor and I know the motor doesn't put out what it says it should.

If the 427 listed above put down 500hp that would be a very good number.

bigjimzlll · 02-22-2009, 06:48 PM

a lot

1000 on guts alone

Wild83C10 · 02-22-2009, 09:41 PM

I would hope that you had a plan and an idea of what kind of power you were shooting for before you spent that kind of money on a serious motor like that.

Sick combo though. I hope you have a cage. Good Luck

1970chevy · 02-23-2009, 09:28 PM

grind num 324-362-19r

**americanmusc1e** · 02-24-2009, 09:42 AM

thanks, i'll try to get to it sometime today

Ont67shortbox · 02-24-2009, 04:50 PM

Maybe you should start a new thread to carry on with this combo, THANKS

**americanmusc1e** · 02-24-2009, 11:28 PM

Quote:

Originally Posted by americanmusc1e

thanks, i'll try to get to it sometime today

having a hard time finding flow numbers on those heads, without that i can only guess

1970chevy · 02-24-2009, 07:29 PM

sorry

1970chevy · 02-24-2009, 11:41 PM

whats your best guess i can call the enigne builder
thanks

02-19-2009, 10:34 AM	#1
Ont67shortbox Registered User Join Date: May 2003 Location: Ontario Posts: 279	Check my combo,please Could someone give me some TRQ/HP numbers and a estimated 1/4 mileET please,here is the combo. 427 .030 over TRW forged pistons .250 dome Chev 241 oval port/open chamber heads 113cc approx 10.6 comp bowl work,gasket match 2.25/1.88 stainless valves Comp solid FT 282s cam 2400-6800 rpm 244/252@.050 .590/.598 lift Edelbrock RPM Intake, gasket matched to heads with 1" spacer Modified 750 dp Holley 2 inch Hooker super comps/3 inch exhaust built 350 turbo trans Neil Chance 9 1/2 3500 stall convertor Frd 9 inch 4.30 gear 31 x13x15 tire 67 short box pickup weight approx 3800lbs lowered 4 1/2F 6 R trailing arms/coil springs block is at machine shop being cleaned,now is the time for me to adjust my combo if you think its needed,Thanks for your help Last edited by Ont67shortbox; 02-19-2009 at 02:19 PM.*

02-19-2009, 10:42 AM	#2
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	Re: Check my combo,please 12.80 in da 1/4..just a wild azz guess though. I'm not familiar with that head casting or how much "work" has been done to them. I think the gear,tire and cam are just about matched for the engines RPM band. I would guess a real world 420 or so HP Look at the old L88 427's with 12-1 CR a solid cam and dual quads made 430 HP. Sounds like a fun combo. __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

02-19-2009, 11:15 AM	#3
Wild83C10 Registered User Join Date: May 2002 Location: NJ Posts: 910	Re: Check my combo,please Need more head info and what kind of intake? If the heads flow enough I think you should run better then 420hp and 12.40s. Check out this thread and post your info in there. More head and intake info would help though. http://67-72chevytrucks.com/vboard/s...d.php?t=317628 __________________ 83 C10 Stepside (SOLD, it was a blast!) 383 MASS-FLO EFI/TKO II 600/3.90 Posi 10 bolt S475 and C4 DM running, fine tuning turbo= Douchebag Racing: Runs Fine all the Time

02-19-2009, 06:07 PM	#4
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	Re: Check my combo,please My desktop Dyno Says about 562hp @5500 and 583ft-lb @ 4000 wasn't sure about the heads so i used Edelbrock performer heads for a baseline. a much bigger set of heads like Victor CNC show about 605hp @ 6000 and 599 @ 4500

02-19-2009, 09:07 PM	#5
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	Re: Check my combo,please If you noticed I said real world HP numbers. I have nothing against desk top dyno programs if you use them to track trends. It has been my experience...having built and dyno'd a few engines.... making over 1 HP per cubic inch is not as easy as magazines make it look. If it was the big 3 auto makers would of been doing it all along. If you think about GM's 454 in the late 70' early 80's made barely over 240 HP. My full race 540 males 840 HP...thats 1.55 hp per cubic inch The 427 at 605 HP is 1.4x per cubic inch. Out of a pump gas truck engine? __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

02-19-2009, 09:26 PM	#7
Wild83C10 Registered User Join Date: May 2002 Location: NJ Posts: 910	Re: Check my combo,please The desktop dynos are a bit on a high side usually. The best thing to use them for is to compare parts. Will changing the cam give you the results you want? That is what the desktop dynos are good for. I have one of the better desktop dynos and I have every single bit of info for my motor and I know the motor doesn't put out what it says it should. If the 427 listed above put down 500hp that would be a very good number. __________________ 83 C10 Stepside (SOLD, it was a blast!) 383 MASS-FLO EFI/TKO II 600/3.90 Posi 10 bolt S475 and C4 DM running, fine tuning turbo= Douchebag Racing: Runs Fine all the Time

02-22-2009, 06:48 PM	#8
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	Re: Check my combo,please a lot 1000 on guts alone __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

02-22-2009, 09:41 PM	#9
Wild83C10 Registered User Join Date: May 2002 Location: NJ Posts: 910	Re: Check my combo,please I would hope that you had a plan and an idea of what kind of power you were shooting for before you spent that kind of money on a serious motor like that. Sick combo though. I hope you have a cage. Good Luck __________________ 83 C10 Stepside (SOLD, it was a blast!) 383 MASS-FLO EFI/TKO II 600/3.90 Posi 10 bolt S475 and C4 DM running, fine tuning turbo= Douchebag Racing: Runs Fine all the Time Last edited by Wild83C10; 02-22-2009 at 09:42 PM.

02-23-2009, 09:28 PM	#10
1970chevy Registered User Join Date: Mar 2005 Location: usa Posts: 142	Re: Check my combo,please grind num 324-362-19r

02-24-2009, 09:42 AM	#11
americanmusc1e Senior Member Join Date: Jan 2009 Location: Austin, TX Posts: 1,079	Re: Check my combo,please thanks, i'll try to get to it sometime today

02-24-2009, 04:50 PM	#12
Ont67shortbox Registered User Join Date: May 2003 Location: Ontario Posts: 279	Re: Check my combo,please Maybe you should start a new thread to carry on with this combo, THANKS

02-24-2009, 07:29 PM	#14
1970chevy Registered User Join Date: Mar 2005 Location: usa Posts: 142	Re: Check my combo,please sorry

02-24-2009, 11:41 PM	#15
1970chevy Registered User Join Date: Mar 2005 Location: usa Posts: 142	Re: Check my combo,please whats your best guess i can call the enigne builder thanks



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