I would like to build an 327 small block with 450hp. For my european car.
The car will have a manual gearbox.
I Bought an 327 chevy (3970010....327.....69....2bolt)with the Camel hump heads (3927186....69-70...302/350......Camel hump,64cc chambers,accessory holes.).
I would like to use the block the crank and the heads.
I have also 2 holleys 650 and 700cfm double pumpers.

Witch parts do i need to get 450Hp and a lot of torque.


Greatings

Grazybrock Netherlands  

It can be done but it will cost a fair chunk of change. I just built one with 461 casting heads. Took them out to 2.02 intake, 1.6 exhaust and quite a bit of port message, dual springs for a high lift cam & screw in studs & guide plates. I chose to run a 6 inch H-beam rod which meant I had to have pistons custom made(J&E 10.5 to 1) due to that there aren't many choices for off the shelf pistons for the 327, that wasn't cheap, but I got what I wanted. I also chose to run a roller cam for the choices in profiles are really killer. I picked up one with a duration of 246 degree int, 253 exh(@.050),.595 int, .600 exh lift. I went with main studs for added stability & windage tray. You'll need some other little things to go along with the performance parts that you choose. I have 2 different soft ware programs, one states 486hp@ 6800 rpm, the other 484@ 6800  with 440ft lbs of torque. This remains to bee seen, but the plans are to actually have it dynoed to verify. You do have a great set of heads to start with, but if I were to do the project again I would choose some aftermarket heads because of the cost factor. Look into these ProComp aluminum heads, they seem to be a pretty good bang for the buck. Check out Ebay, I've seen quite a few sets there. The 700 cfm double pumper would be a good choice for this combination. This is a great set up for a manual trans car. It is a pretty radical street set up, but very fast.  

I'm confused why you had to have custom pistons made for your 327, and your comment "...aren't many choices for off-the-shelf pistons for the 327..."

The 327 uses the same piston as a 350 Chevy, and very few piston companies have a good selection of 350 pistons.

My recommendation for getting 450 HP out of your 327 is to invest in some aftermarket aluminum heads with good flow (RHS, Dart, GM Performance Parts, etc. all have great aluminum heads that are very affordable, and will be superior to O.E. iron heads) and look at using a blower or turbo on the engine. The advantage to using a power adder for what you want is you'll be using a lwoer compression piston, which means you can run 93-octane gas, instead of having t run 10.5:1 or 11:1 pistons which'll require much higher octane gas, somethign that's not always easy to come by.  

If you want to make a lot of torque, don't build a 327...

If you do want around 450 horsepower it's do-able but barely on pump-gas and not very "streetable." A healthy roller camshaft and aftermarket aluminum heads will probably makes things easiest...  

327 and 350 pistons are not the same.  A 327 and a 350 both have a 4.000 inch bore, but a 327 has a 3.25 inch stroke, a 350 has a 3.48 inch stroke, so if you were to use a 350 piston in a 327, the piston would be almost a 1/4 of an inch below the deck. Wouldn't be much compression there.


At the time, I wasn't able to find any off the shelf pistons for a 6 inch rod. A stock rod length for a 327 is 5.7 inches long, which there are a few.