how much horsepower

[84gt347]

if i build a 347 with flat top pistons , 9.3 to one compression, afr205 heads with a comp xr286r cam and a victor jr intake with a750 holley?? I'd give it more compression but i plan on adding a procharger in a couple of months.

[420nitro]

Originally posted by 84gt347
if i build a 347 with flat top pistons , 9.3 to one compression, afr205 heads with a comp xr286r cam and a victor jr intake with a750 holley?? I'd give it more compression but i plan on adding a procharger in a couple of months.

Enough to shatter a production block. Hopefully you are planning on a Dart or SVO block with a strong crank,rods and pistons.
With out the blower I would say it is capable of making 375-450h.p to be safe. (@flywheel)
With the blower (8-10 psi w/o intercooler) over, 550h.p@ flywheel maybe more. Depends on WAY TO MUCH STUFF without sounding stupid.
Hope this helps
P.S
To get 9.3 to one compression with the 205 heads I believe you will have to run dish pistons.

[84gt347]

How about a thick gasket to get 9.3 comp

[420nitro]

Originally posted by 84gt347
How about a thick gasket to get 9.3 comp

I don't believe so, sorry.
Generally speaking when you run a flat top piston with good size valve relief you end up with a piston that has 1.5 2.5 negative cc.
Now looking at the Afr 205 heads, they only mention having 58cc chamber heads available. You can always have the chambers worked so they are bigger but, just to keep it simple, with that size chamber and being a 347 I would look for a piston to have about a -22cc dish piston. That should yield you a compression around 9 to 1.

Example:
For a 347 (4.030 bore and a 3.40 stroke)
Zero deck height
4.100 bore gasket size
.040 compressed thickness (common average gasket thickness between .035-.045)
-19cc dish piston
will give you a 9.29 to 1 compression.

You might have your piston in the hole xx amount or out of the hole for xx amount and will change your end result of your compression! So the example that was stated was just for an example purpose only to give you an idea so you can fine tune it yourself. There are a lot of other tricks to change compression but that example makes getting the new head gaskets easier because there are very common.

And yes I got way too much time on my hands!!

[84gt347]

Thanks buddy

[jonnyk]

That is a lot of airflow. If you spin it high enough I imagine it'd be good for around 450 flywheel ponies.