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-   -   hp estrimate again. (https://67-72chevytrucks.com/vboard/showthread.php?t=605754)

c20pickup 12-06-2013 03:05 PM

Re: hp estrimate again.
 
any other good heads for my 900-1100$ budget?

mmiddle 12-06-2013 03:27 PM

Re: hp estrimate again.
 
What do you want to do with the truck? General purpose truck use, Grandma's grocery-getter with a large trunk, or a Saturday night street fighter?

67 chevelle 12-06-2013 04:47 PM

Re: hp estrimate again.
 
Quote:

Originally Posted by c20pickup (Post 6401664)

this leads me to my next question for you guys (you all seem very knowledgable on this subject) what kind of heads should i buy?

Vortec heads are hard to beat , for the price and performance , perfect for a 400 hp +or- small block

67_C-30 12-06-2013 06:47 PM

Re: hp estrimate again.
 
Here is a great shootout of budget SBC heads heads, and the baseline engine has the heads you have. We've built a couple of engines with the Patriot heads in the article, and they flat out work. They've seemed to hold up well, and are good quality for the price. The Edelbrocks work well also, and I'll some guys put a whole bunch of miles on them. Considering the price of the Patriot, Jegs, or Summit heads, I would not buy Vortecs either modified or having them modified to run a cam over .480 lift and having to buy a Vortec intake as well. They are good heads if you already have them or getthem dirt cheap, but aluminum heads very reasonable these days, and you can run higher CR without detonation than with iron heads.

http://www.carcraft.com/techarticles...head_shootout/

67_C-30 12-06-2013 07:02 PM

Re: hp estrimate again.
 
Quote:

Originally Posted by Critter (Post 6404789)
I will agree that the advertised dyno numbers for aftermarket packages aren't usually realistic to the average hot rodder. First off they are talking about crank hp numbers. they set up an engine with everything perfectly machined and balanced. After they put on the parts being sold they sit at the engine dyno for hours on end tweaking and tuning and trying different options until they squeeze out every last drop of power. Usually by that time the motor is timed in a way that it is no longer a real world drivable engine. Not to mention that average guy in his garage or even working with a machine shop will never tweak the engine anywhere close to that to get everything setup even close to the perfect conditions that were used for dyno graphs. Unfortunately 9 times out of 10 when I dyno a vehicle that has never been on the chassis dyno the owner is disappointed in his numbers. Either because he had advertised crank HP numbers in his head or the vehicle just flat out isn't tuned right.

I agree with idea that the average guy can't just all bolt this together and end up with the advertised numbers, but if the package is properly tuned, they will yield times on the track very close to the numbers to advertised numbers should get. A friend of our's put the Edlebrock Performer RPM kit on a GM 350 crate engine his street/strip '72 Nova. After a few times at the track and tweaking it in, we got 12.30's @ 107 out the car, and it weighed 3240# with him in it. That's knocking on the door of the advertised numbers Edelbrock claims.

I will say that car was running 12.50's and 12.60's when he first put it together without track tuning, so that reinforces what you are saying about the average guy just putting this in his car/track calling it a 420 HP engine.

Critter 12-06-2013 07:35 PM

Re: hp estrimate again.
 
67_C-30, definitely. We are in agreeance. The point being that if you want to max out your horsepower you have to tune the engine, that can be on a chassis dyno or at the track. The track may even be a little better at achieving real world power but it is much, much more inconvenient. Engine dynos are great but they don't really get you all the way there. The engine needs to be in the car/truck to really optimize everything. However, I would never tell people they HAVE to have their engine tuned (dyno or track) for it to be a fun/well running vehicle. You can do a lot by ear, nose and seat of the pants as long as you know what un-burnt fuel smells like. If its just a cruiser or daily driver then you don't really have to mess with hard core track or dyno tuning. Good conversation here, by the way!

67_C-30 12-06-2013 08:29 PM

Re: hp estrimate again.
 
Quote:

Originally Posted by Critter (Post 6405363)
67_C-30, definitely. We are in agreeance. The point being that if you want to max out your horsepower you have to tune the engine, that can be on a chassis dyno or at the track. The track may even be a little better at achieving real world power but it is much, much more inconvenient. Engine dynos are great but they don't really get you all the way there. The engine needs to be in the car/truck to really optimize everything. However, I would never tell people they HAVE to have their engine tuned (dyno or track) for it to be a fun/well running vehicle. You can do a lot by ear, nose and seat of the pants as long as you know what un-burnt fuel smells like. If its just a cruiser or daily driver then you don't really have to mess with hard core track or dyno tuning. Good conversation here, by the way!

I totally agree - great discussion! I'll also add that car/truck's suspension has to be working at the track to achieve the numbers, and that's where a dyno has an advantage IMO.

As far as not needing track or dyno tuning, that's the truth for the vast majority of people out there. Most people that have never stomped a true 400 HP car/truck on a set of tires that sticking have no clue of how strong that actually is. I've given guys rides in some of our street/strip cars that had big block Chevelles and Camaros back in the day that had no clue how fast an 11 or 12 second car really is.

My '82 Z28 ran a best of an 11.18 @ 121 on motor with a stout 383 stroker. A guy I know that was always talking about how fast a 425 HP 427 Vette he used to have was, and that "He wouldn't even fool with a small block". I took him for a ride my Camaro one day, and there's an adandoned cotton mill down the road from us that has nearly straight road that nearly a 1/4 mile long before it goes into a slight curve. There's never any traffic down there, so we called it our "proving grounds".-lol I ran ET Streets when I drove the car at the time, so I went down there, stopped and did pretty good little burnout enough to get the tires sticky. I rolled forward a little bit and pulled it up on the stall, and mashed it. It hunched just a little immediately, but hooked pretty hard for it being on the street. I turned her up to 6800 in first and second and let out at about 5000 in 3rd. My buddy was hanging on to the armrest and console and wasn't saying anything at first. I asked him if was OK, and was just nodding his head and laughing after a few seconds. I asked him how he felt about a small block after that. He just said "Yeah, I guess things have changed". He said "I've never felt a car pull like that, and I didn't think a N/A small block could run like that!". I told that my small block wasn't even radical and that were a whole lot of them out faster than mine.

To make a long story short, he had a rectangular port, solid lifter BBC, but it was in a car on street tires, with a stock converter. He had never felt a tuned car putting a lot of power to the ground. His idea of fast was way off because he'd never been in a truly fast car. The majority of people fall into this category.

c20pickup 12-07-2013 01:15 AM

Re: hp estrimate again.
 
Quote:

Originally Posted by mmiddle (Post 6405066)
What do you want to do with the truck? General purpose truck use, Grandma's grocery-getter with a large trunk, or a Saturday night street fighter?

hmmm, out of the options listed id choose saturday street fighter, something i can take to the strip, drive aorund town without overheating problems, and even run it down the highway, but by no means a daily driver. im putting to much money into this truck to risk having it wrecked on the road. i want something that is fun and fast and throws your back in the seat when you hit the skinny pedal

c20pickup 12-07-2013 01:17 AM

Re: hp estrimate again.
 
Quote:

Originally Posted by Critter (Post 6405363)
67_C-30, definitely. We are in agreeance. The point being that if you want to max out your horsepower you have to tune the engine, that can be on a chassis dyno or at the track. The track may even be a little better at achieving real world power but it is much, much more inconvenient. Engine dynos are great but they don't really get you all the way there. The engine needs to be in the car/truck to really optimize everything. However, I would never tell people they HAVE to have their engine tuned (dyno or track) for it to be a fun/well running vehicle. You can do a lot by ear, nose and seat of the pants as long as you know what un-burnt fuel smells like. If its just a cruiser or daily driver then you don't really have to mess with hard core track or dyno tuning. Good conversation here, by the way!

id be willing to tune and test it, heck im already putting this much effort into the truck, why not spend a couple days at the track or on the dyno. seems worth the extra hp to me

c20pickup 12-07-2013 01:36 AM

Re: hp estrimate again.
 
Quote:

Originally Posted by 67_C-30 (Post 6405319)
Here is a great shootout of budget SBC heads heads, and the baseline engine has the heads you have. We've built a couple of engines with the Patriot heads in the article, and they flat out work. They've seemed to hold up well, and are good quality for the price. The Edelbrocks work well also, and I'll some guys put a whole bunch of miles on them. Considering the price of the Patriot, Jegs, or Summit heads, I would not buy Vortecs either modified or having them modified to run a cam over .480 lift and having to buy a Vortec intake as well. They are good heads if you already have them or getthem dirt cheap, but aluminum heads very reasonable these days, and you can run higher CR without detonation than with iron heads.

http://www.carcraft.com/techarticles...head_shootout/

reading the car craft link now, they have a different intake, and 1.6 rockers, slightly larger cam, however the the horspower for the stock iron heads was 358, which kind of surprised me, now i can see where the 300-325hp estimatescame from. this link is what i needed! helped alot! im looking at either the patriots, because of the torque numbers and peak hp numbers or the jegs, but i like the 815$ price of the patriots! :metal: now what is involved with swapping to 1.6 ratio rockers? just bolt on and go? or machining required? or am i better off sticking with the stock ratio (1.5? correct me if im wrong) which is better/worse. i guess i could be looking at just under 400hp, 400tq with a set of patriots or jegs, is this an appropriate estimate with my current setup?

c20pickup 12-07-2013 01:38 AM

Re: hp estrimate again.
 
Quote:

Originally Posted by c20pickup (Post 6405912)
reading the car craft link now, they have a different intake, and 1.6 rockers, slightly larger cam, however the the horspower for the stock iron heads was 358, which kind of surprised me, now i can see where the 300-325hp estimatescame from. this link is what i needed! helped alot! im looking at either the patriots, because of the torque numbers and peak hp numbers or the jegs, but i like the 815$ price of the patriots! :metal: now what is involved with swapping to 1.6 ratio rockers? just bolt on and go? or machining required? or am i better off sticking with the stock ratio (1.5? correct me if im wrong) which is better/worse. i guess i could be looking at just under 400hp, 400tq with a set of patriots or jegs, is this an appropriate estimate with my current setup?

oops, scratch that, looks like my cam is about the same size as the one used in the test, maybe just atouch larger

c20pickup 12-07-2013 01:46 AM

Re: hp estrimate again.
 
hmm just looked for the patriot heads part #2168, and theres nothing. and everything i found was over 815$ like what was listed in the test?


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