any GUESSES on HP here?
I ♥ Acer
Joined: Oct 2004
Posts: 17,565
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RE: any GUESSES on HP here?
Well, we have anything from 230 to 400 guessed here on this thread. Now, ain't we a bunch of genuine dyno freaks? 
We've got guys talking about Cheys, we've got guys talking about rear wheel as opposed to flywheel hp, we've got guys who actually don't have a clue, and we have a few who do. I love the classic section of MF.
We've got guys talking about Cheys, we've got guys talking about rear wheel as opposed to flywheel hp, we've got guys who actually don't have a clue, and we have a few who do. I love the classic section of MF.
3rd Gear Member
Joined: Dec 2005
Posts: 755
From: North Idaho
RE: any GUESSES on HP here?
ORIGINAL: 66 Hardtop 5.0
Be sure to get the Performer RPM or RPM AirGap intake. The basic Performer is nothing but a stock 4bbl replacement, except it`s alu.
Oh, and my guess is 360 at the crank
ORIGINAL: muggsy
Hey guys,
I know this is far from an exact science, but when I tell my friends I'm getting my motor rebuilt, the first question everyone asks is how many HP will it become. I told the machine shop which heads and cam to use, so he doesn't know the power outcome yet...I know the deal with engine vs rear wheel HPand impossible to truly tell what the car has for HP without a dyno, but any educated guesses would be cool for me to hear for kicks. I know its a mild performance rebuild too, that's the way I wanted it. Nice daily driver with a good pop and stock converter, so go easy on the ***** rebuild comments!!!:
67 289 block
bored .30 over
AFR 165cc street heads, stud mountinghttp://www.airflowresearch.com/165sbf_sh.php
Comp Cam Xtreme energy 262 cam and lifters (kill the annoying pop up that comes right over the description and click on specs) http://www.compperformancegroupstore...ry_Code=31-CAM
Stock C4 auto
3.55 8 in rear gears
Pertronix ignition, distributor
Tri Y headers w/dual 2 1/4 in exhaust w/H pipe
Holley 600CFM carb w/ Edelbrock Performer intake
Holley Mechanical fuel pump
unsure about crank, rod, and pistons. I'm told 9:1 compression will be the outcome.
My guess is 300-325HP, figuring taking a stock C code and justputting a 4 barrel, new intake and headers should get you close to 240HP.Am Iclose? Any suggestions would be good too, as the motor just got sent to the machine shop yesterday..
Hey guys,
I know this is far from an exact science, but when I tell my friends I'm getting my motor rebuilt, the first question everyone asks is how many HP will it become. I told the machine shop which heads and cam to use, so he doesn't know the power outcome yet...I know the deal with engine vs rear wheel HPand impossible to truly tell what the car has for HP without a dyno, but any educated guesses would be cool for me to hear for kicks. I know its a mild performance rebuild too, that's the way I wanted it. Nice daily driver with a good pop and stock converter, so go easy on the ***** rebuild comments!!!:
67 289 block
bored .30 over
AFR 165cc street heads, stud mountinghttp://www.airflowresearch.com/165sbf_sh.php
Comp Cam Xtreme energy 262 cam and lifters (kill the annoying pop up that comes right over the description and click on specs) http://www.compperformancegroupstore...ry_Code=31-CAM
Stock C4 auto
3.55 8 in rear gears
Pertronix ignition, distributor
Tri Y headers w/dual 2 1/4 in exhaust w/H pipe
Holley 600CFM carb w/ Edelbrock Performer intake
Holley Mechanical fuel pump
unsure about crank, rod, and pistons. I'm told 9:1 compression will be the outcome.
My guess is 300-325HP, figuring taking a stock C code and justputting a 4 barrel, new intake and headers should get you close to 240HP.Am Iclose? Any suggestions would be good too, as the motor just got sent to the machine shop yesterday..
Oh, and my guess is 360 at the crank
I welcome somone(s) to provide some kind of evidence (article or somehing) that the Peformer is just an aluminum version of the stock intake. Untill then I say its just a myth.
Banned
Joined: Jan 2007
Posts: 956
RE: any GUESSES on HP here?
Horse power on a dyno and horse power that someone writes on a piece of paper are different. A 225 HP 289 on a Dyno Would make 180-190 HP. Then Someone stamps 225 on the air cleaner,
My bet stands, $100. If the engine dyno reads more than 260.
Im not trying to stir anything, HP is HP and just because You all think it should have 300+ don't mean it will. Or why would we bother building an engine. Just let one of you say it's got 300 and "It does". And while your at it make it get 30 MPG also . All it takes is a screen under the carb, and then put some split fire plugs in and get an extra 10-15 hp.
Whatever. I just don't care, The guy asked for a HP estamate and you guys gave yours and I gave mine, Sorry mine don't agree with yours, But, Thats why they make Chevys, ain't it?
My bet stands, $100. If the engine dyno reads more than 260.
Im not trying to stir anything, HP is HP and just because You all think it should have 300+ don't mean it will. Or why would we bother building an engine. Just let one of you say it's got 300 and "It does". And while your at it make it get 30 MPG also . All it takes is a screen under the carb, and then put some split fire plugs in and get an extra 10-15 hp.
Whatever. I just don't care, The guy asked for a HP estamate and you guys gave yours and I gave mine, Sorry mine don't agree with yours, But, Thats why they make Chevys, ain't it?
6th Gear Member
Joined: Dec 2006
Posts: 8,007
From: Citrus County, FL
RE: any GUESSES on HP here?
Be sure to get the Performer RPM or RPM AirGap intake.
ZZ, i know opinions are like... well you know - but wow man you seem REALLY left field here?!?!?!
Thread Starter
2nd Gear Member
Joined: Jan 2006
Posts: 327
From: Boston MA
RE: any GUESSES on HP here?
this build seems similar to mine as described at the start of this thread, except I have a 289 not a 302....how would mine be all that different? Same exact heads, and i THINK (not sure) my cam is a bit bigger...how would it being a 302 vs built 289 differ in HP generation?
http://www.carcraft.com/techarticles...ngine_buildup/
http://www.carcraft.com/techarticles...ngine_buildup/
6th Gear Member
Joined: Dec 2006
Posts: 8,007
From: Citrus County, FL
RE: any GUESSES on HP here?
any 302 and 289 with the EXACT same specs would be within a couple horsepower of each other. the 289 will rev a little quicker and the 302 will have a little more torque (we're talking differences most schleps wouldnt even notice) - if they are getting 400 from that build in the carcraft magazine with a stock cam..... you use a better cam with that 289 you'll be at or over 400 no problem
5th Gear Member
Joined: Sep 2006
Posts: 2,266
From: Australia
RE: any GUESSES on HP here?
hey guys, am i missing something here. ZZ proposed the answer in terms of what the dyno will probably say...but everyone else is talking flywheel hp b/c it sounds better!!
so, there's a rule of thumb conversion that says 15% drop in manual trans and 20% drop in auto between flywheel and rear wheel.
so 260 rear wheel = 325 at the fly...pretty much where most are guessing???
so, there's a rule of thumb conversion that says 15% drop in manual trans and 20% drop in auto between flywheel and rear wheel.
so 260 rear wheel = 325 at the fly...pretty much where most are guessing???