Printable View
i have a stock crank and rods but the block is bored over .30 and i have flat top pistons. If i put on a set of heads with 2.08 valves 49cc comb. chambers and 230cc intake runners matched up with a torker 2 intake with matching cam would this work ok?
Please fill us in on the engine. 350? Already the heads sound way too big and "matching" cam is????? Stock crank? If it's stock oem cast, there's going to be problems. Not to make you feel left out of the loop, there is too much info not being supplied. Please help the thread here by giving us more to go on and what it is you wish to accomplish. Everybody here is more than willing to help and all of them wish to give you the right advice to give you the best results.
One of the magazines did a article on a budget build 350( I think it was chevy hi performance). They put those same Dart heads on a bone stock GM goodwrench 350 engine, made 11-1 compression with the dished pistons, and put a huge cam in it and made 530 horsepower. BUT.... that was a horrible build because the second anybody actually put it in a car with some slicks the crank and rods would be out on the ground. Plus the heads were way too big for a 350. 230's should be used on a 406ci or larger. The engine would be a dyno queen only, so I would say NO those heads won't work. That magazine should have never published that article.Quote:
Originally Posted by #1firebird
Heads are way to big un-less you are going to spin it to 9,000 rpm's.Quote:
Originally Posted by #1firebird
How much HP and how many RPMS is a stock bottom end good for?? Arp rod bolts inserted.
That depends on if it is a cast or steel crank and how new everthing is.Quote:
Originally Posted by jimmyjeep
A fully preped 5.7 rod with ARP bolts will handle 6,000 rpm's.
But for how long? That is the question.
i just wanted to get as much horsepower as i can but still be able to run pump gas. And still have the sickest 350 in my town
if those heads are to big then how are you supposed to build a 900 hp 350 without any power adders or high compression, not saying thats what im trying to do
well yeah i was planning on building a screamerQuote:
Originally Posted by erik erikson
900 hp is always achievable. Then again, having Angelina Jolie greeting you at the door when you come home is too (somebody know how that's done?) you don't need to go that high in HP. Stick with what works. A set of 180 or 200 cfm heads with right combo cam will spin 9 grand. Question is, How will the rest of the engine take it? Will your accessories take it on a street motor? And are you willing to keep the bucket of cash at the ready to feed it on a constant basis if you are going to drive it daily or even a few times a week? Start from basics. Good bottom end good geometry (ALWAYS good geometry) ANd use common sense and you'd be surprised how much you can get out of it. Thanks.
yeah well i just want to build a motor that will stand up to a drive a couple of times a week but that will still give me a good scare every now and then. wanted to run pump gas and red line at like 7 to 8 grand and have absolutly no problem screeching the tires when i shift.
why did you and eric say the heads are to big whats wrong with bigger intake runners and huge valves
An engine that is going to rev to 8,000 rpm isnt going to run on pump gas. You would need at least 13-1 compression and a monstrous solid roller camshaft. Your budget decides what the motor is going to be. A stock crank and rods is not going to cut it.Quote:
Originally Posted by #1firebird
You can get by with your stock motor with a set of 180cc 64cc chamber dart heads, and a 280H comp magnum cam. You can use that torker2 intake with that combo. With the flat top pistons that you have and the 64cc chamber it should be around 9.5-10 to 1 compression, which would be a good on pump gas. You should make over 400 horsepower with that setup. But don't expect it to rev to 7 or 8 grand.
what about 58cc comb chambers instead of 64?
Elko and I understand "velocity". That where you're gonna kill the use of the engine when you really wanna improve the flow characteristics. Without bragging, I can make you motor turn up to and over 9 grand. Let's not forget the basics though. DO you really wanna turn 9 grand? Elko's got a better perspective on where he was going with his reply. You can do very very well at limiting this engine to a more respective rpm like 5500-6000 and when it's just right, you'll swear it's turning 9,000.
haha well sounds good. i just want a screamin ass motor that will bark the tires when i shift and light up the tires like none other :)
Focus on parts that put the rpm peak and the torque peak specs very close together and focus on good port velocity and low rpm torque production on a street based car and you have all you want.
Matching the components to all the same specs will insure you have a very responsive motor.....substitute on part for a mismatched high rpm part thinking this will get that little extra and it will cost you ........with the right parts you can wind it up in the rpms and still have a good street motor ,you just will not be makin any power or going any faster at higher rpms unless you use non street oriented parts ,which is what you do not want.
There are two factors when picking a port volume or looking at flow numbers.Quote:
Originally Posted by #1firebird
Cubic inches and rpm's.
I am sure you have heard an engine is an "air pump".
You can only use so much fuel and air.
To build a 500 hp 383 you need around 195 cc's in port volume or around 280 cfm.
Look at hyd. roller cams that are around 240 degree's of duration at .050 and .550 lift.
You also need to keep your comp. ratio at 10.5 to 1.
Build for low and mid RPM torque and leave the big horsepower numbers for the drag strip high revvers. As Eric suggested, that 500 horse stroker is probably well over 500 ft lbs. torque, and I would imagine it's making peak torque somewhere between 4500 to 6000 RPM!!!! Built right and maintained properly it will perform excellent and last a long time!!!!
what about 58cc comb chambers instead of 64?Quote:
Originally Posted by 69elko
do you think a stock 350 bottom end with a set of world 58cc heads torker 2 intake with matching cam and 750 edelbrock would work fine? if so how do you think it would run, bottom end torque and top end?
Why do you want such small combustion chambers? Even with large dished pistons, it's difficult to get under 9.5:1 with 64cc heads. You want to stay under 10:1 or 10.5:1 even if you run a big cam if you have any aspirations of running pump gas. 64cc heads are the way to go, not smaller.
The 10.5 to 1 will run with 92 octane and alu. heads.Quote:
Originally Posted by 76GMC1500
The 64cc chambers will put you right on the edge of running pump gas with the flat top pistons you have. Which world heads are you thinking about using? The S/R torquers?Quote:
Originally Posted by #1firebird
The engine build I posted earlier would give you a good all around engine, one that would be good on the street or strip, on pump gas, and would do 12 second quarters in a medium sized car with good traction and the right gearing and stall converter.
because i dont want a good all around everyday engine