I hate to even ask this question because i know some people get upset about guys like me who won't buy a Desktop dyno program but i just can't justify it. Can anyonre plug in my info and give me an estimate of my HP and TQ?

I have a 327 bored 0.030 over to 331. I run flat-tops with 4 valve reliefs. They are 0.045 in the hole and i run a 0.015 head gasket for a 0.060 quench. I also run 062 vortec 1.94/1.50 ported heads with an edelbrock aluminum performer intake manifold. I use a Holley 650 VS carberator woth 70 jetsup front and 69's in back.

The cam is a Lunati 06109 street/strip cam with 272/284 advertised and 216/228 @0.050 with 0.454/0.480 lift. The intake opens at 01BTC and closes at 35ATC. The exhaust timing is 51 BBC and 3 ATC.

I run a stock HEI and fuel pump and a 200-4R 4 speed automatic overdrive with a basically stock stall converter and 12 bolt posi with 331 gears and P235/75R15 radials.

Any help would be greatly appreciated. I'm hoping for 325-350 HP and similar TQ numbers.

Clyde

I forgot to say they are vortec heads with z28/lt1 springs.

Clyde

If tuned correctly I'd guess an easy 350hp at around 6000 rpm. I'd guess your static compression ratio to be around 9.0-1. My Son's 331 ended up at 10-1 with 61cc chambers, zero piston to deck, two v relief flattops, and .045 gasket.

RPM···········1500····2000····2500····3000····3500 ····4000····4500····5000····5500····6000
Brake_Tq······187·····245·····284·····314·····326· ····331·····326·····311·····288·····252
Brake_HP······53.3····93.3····135·····180·····217· ····252·····279·····296·····302·····287
Exh_Pres······.2······.4······.7······1.1·····1.6· ····2.1·····2.7·····3.2·····3.7·····4.0
Int_Vacuum····.1······.3······.6······.6······.6·· ····.6······.6······.8······.9······1.0
Vol_Eff_%·····59.2····67.8····74.9····81.1····85.3 ····88.2····89.5····89.1····87.8····84.4
Actual_CFM····91.7····140·····193·····251·····308· ····365·····416·····460·····499·····523
Fuel_Flow·····33.5····51.2····70.7····91.8····113· ····133·····152·····168·····182·····191
A/F_Mix_Qal···86.5····98.7····99.7····100.0···100.0· ··100.0···100.0···100.0···100.0···100.0
BSFC··········.629····.549····.523····.511····.518 ····.529····.545····.568····.603····.665
BSAC··········7.893···6.888···6.558···6.411···6.50 3···6.638···6.839···7.126···7.570···8.339
Friction_HP···11······18······26······36······48·· ····61······77······95······119·····146
Mach_#········.131····.175····.219····.263····.306 ····.350····.394····.438····.482····.525
Piston_Spd····813·····1083····1354····1625····1896 ····2167····2438····2708····2979····3250
Piston_Gs·····133·····237·····371·····534·····727· ····949·····1201····1483····1794····2136
Overlap_%VE···-3.5····-2.7····-2.3····-2.0····-1.9····-1.7····-1.6····-1.5····-1.4····-1.3
Int_AvgVel····87······116·····145·····174·····202· ····231·····260·····289·····318·····347
In_InertiaPrs·.0······.3······.8······1.4·····1.8· ····2.2·····2.3·····2.2·····2.0·····1.7
In_ResTunPrs··0.0·····0.0·····.0······.0······.0·· ····.0······0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····98······130·····163·····195·····228· ····261·····293·····326·····358·····391
ExTun_Prs·····1.6·····1.5·····1.4·····1.4·····1.4· ····1.3·····1.1·····.8······.7······.7

Onofakind67,

Thanks for running the numbers for me. Does the brake HP equate to rear wheel horsepower or flywheel horsepower? If so, I've read that you can loose from 10-20% through the drivetrain. This would equate to 330-360 flywheel horsepower. Am I on the right track here? I also forgot to give you the centerline specs on the cam. They are 107 intake centerline and 112 lobe separation. I also forgot to mention that I use headers and duals.

Clyde

Brake HP = flywheel HP (as measured with a "water brake", which is what engine dynos typically use, it's kind of like a torque converter)

That's flywheel hp in the graph, rwhp would be about 80% of that. My analyzer will spec the lobe centers if it's given the opening and closing points of the lobes, so I had the 107 and 117 in the mix.

I thought it was unusual to list the tire size and not any information about the exhaust system. Smokey Yunick called the exhaust system the 'third leg' of his power triangle. I put a set of log manifolds and a factory exhaust system on your car to keep the exhaust gases from burning the paint off your fenderwells. Since you subsequently disclosed that you have 'headers' and 'duals' I put some generic headers on your engine with a nice dual exhaust.

RPM···········1500····2000····2500····3000····3500 ····4000····4500····5000····5500····6000
Brake_Tq······196·····250·····301·····331·····341· ····349·····345·····329·····306·····265
Brake_HP······56.0····95.1····143·····189·····227· ····266·····295·····313·····320·····303
Exh_Pres······.1······.2······.4······.7······1.0· ····1.4·····1.8·····2.2·····2.5·····2.7
Int_Vacuum····.2······.4······.6······.6······.6·· ····.6······.7······.8······1.0·····1.1
Vol_Eff_%·····60.6····68.4····77.1····83.3····87.2 ····90.6····92.3····92.0····90.7····86.7
Actual_CFM····94.0····141·····199·····258·····315· ····374·····429·····475·····515·····537
Fuel_Flow·····34.3····51.6····72.8····94.3····115· ····137·····157·····174·····188·····196
A/F_Mix_Qal···86.5····98.7····100.0···100.0···100.0· ··100.0···100.0···100.0···100.0···100.0
BSFC··········.613····.543····.507····.499····.507 ····.515····.531····.554····.588····.648
BSAC··········7.686···6.807···6.366···6.257···6.35 8···6.458···6.656···6.952···7.375···8.132
Friction_HP···11······18······26······36······48·· ····61······79······100·····125·····153
Mach_#········.131····.175····.219····.263····.306 ····.350····.394····.438····.482····.525
Piston_Spd····813·····1083····1354····1625····1896 ····2167····2438····2708····2979····3250
Piston_Gs·····133·····237·····371·····534·····727· ····949·····1201····1483····1794····2136
Overlap_%VE···-2.5····-2.4····-1.1····-1.0····-1.1····-.9·····-.6·····-.6·····-.6·····-.7
Int_AvgVel····87······116·····145·····174·····202· ····231·····260·····289·····318·····347
In_InertiaPrs·.0······.3······.8······1.4·····1.8· ····2.2·····2.3·····2.2·····2.0·····1.7
In_ResTunPrs··0.0·····0.0·····.0······.0······.0·· ····.0······0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····94······125·····157·····188·····219· ····251·····282·····313·····344·····376
ExTun_Prs·····.7······1.2·····-.2·····-.4·····-.2·····-.8·····-1.5····-1.9····-2.1····-1.8