Thread: 350 build up

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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.

Originally Posted by #1firebird

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

There are two factors when picking a port volume or looking at flow numbers.
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!!!!

Originally Posted by 69elko

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.

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?

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.

Originally Posted by 76GMC1500

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.

Originally Posted by #1firebird

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?

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?

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