I would like to know the HP a stock 355 Chevy has?

Question

This 355 chevy has been bord 30 over, its a new rebuild.Ive got a 81 TA with 373 gears,350 trany with b&m comp shift kit,holly 650 polished,elderbrock polished intake.How much HP do you think it will push?,could you also tell me what more i could add to increase the HP

Answer 1

Since my crystal ball is in the shop, its gonna be tough. Would need to know a few things like cam specs, which heads, compression ratio, what type of intake, (single / dual plane would help, not polished). As far as an increase....what is your budget? That's the limiting factor to making power......

Answer 2

As you may or may not know, a stock 350 makes around 195+ HP. Bore it .030" over (355) and you increase the displacement, thus increasing the power. A high output 350 has 345 HP @5250 RPM. Depending on your particular build up, as in which pistons you use, heads you use, and the headers you use is all major factors in determining your actual HP. Often overlooked is the thickness of the head gaskets. They play a mojor role in the power it will make due to the compression it makes.
I build engines on a pro level, and have done so for many years. I can't answer your question, or can anyone else for that matter, and give you an honest answer. This is because there is not enough information within your question to do so. If you will go to kbpistons.com there is a technical section where you can do the numbers on an engine build. You must know many factors such as, the specs of the cam you used, deck height, piston type (flat top, dome, etc;) head CC, runner CC, size of intake & exhaust valves, compressed thickness of head gaskets, and type & size of headers you are using. I believe the web sit I refered to is kb/silvolite site. I don't know right off hand the exact address, but if you do a search you will find it. Also; another place to get good information on small block Chevy engines is www.chevyhighperformance.com They have (in their technical section) about any engine build-up you could think of, and I'm sure you can get close to yours there. One other thing that comes to mind is; a computer program called "desk top dyno". It will get the answer pretty darn close. You can pick up a copy of this program on CD at most parts stores such as Auto Zone for about 15-20 dollars.
As to the second part of your question: A good set of heads, a cam, and a set of good headers can get you into 375-400 HP easly. Consider going to a better ignition system, and bringing the carburetor up on the jets to between 700-750 CFM once you install these componets. A retrofit roller cam shaft, lifters, pushrods, and roller rockers can get you well on the other side of 400 HP. Porting & polishing out the runners and bowls on the heads will increase the flow dramatically. Don't forget to gasket match the intake to head, and head to header transfers, as you will really see the numbers go up. If you could add a set of flat top pistions, and use a shim type head gasket, you will feel it in your pants when you hit the throttle. If you do all I'm suggesting, you could be looking at well over 450 HP out of a 355.
Glad I could Help, Good Luck!!!

Answer 3

with a good cam mabe 320-330hp. with a cam and good heads with 2.02 intake valves for example, mabe 360-380. hp. do you have an hei distributor? if so you could change the springs under the rotor to advance timing, and gain hp.

Answer 4

Get a dyna test at a car shop...they will be able to see what you run...then a little tinkering , maybe switch the heads.

Answer 5

Max 65 HP!!!!