Arias Pistons please give me an estimate of the Compression ratio

[FERoadster]

The pistons are at my builder right now so no additional pictures.
I called Arias and they said the pistons are out of their info base.
Pistons were acquired in exchange for welding work so not much/no  cost involved.
They are +020 with a 3.98 stroke pin height.
 Going into a 427 CO block with LR heads, HR valves and chamber work by Mondello. Chambers opened up (rounded) around the spark plug hole. Not sure of the chamber volume.
Barry R might have an idea since he installed new valves with the head repair. But that was 3 years ago.
Heads were also acquired for welding. I'm really cheap!!!  Crank was free, Lakewood Bell & plate was $100 overall a low budget build --- remember I'm cheap.

Richard >>> FERoadster
 

[BH107]

Given common specs everywhere else you'll be 12:1 (5cc dome) to 12.5:1 (10cc dome) assuming 78cc chambers with the work. No way to know for sure until you measure the heads and domes but it will be up there.

[FERoadster]

To me the valve pockets seem pretty deep and have a lot of volume.
My cam is a Oregon Cams 1033 with 108 so I'm hoping not too much dynamic comp.  and it will be streetable?Thanks for the reply.

Richard

[jayb]

Really the only way to know for sure is to mock it up and check it.  Put the piston and rod in the block, go to TDC, then back down some precise amount, like 0.250" (measure the depth with a dial caliper).  Put some grease around the edge of the piston to seal the rings off, then put your flat plexiglass plate across the bore and measure the CC's of the volume.  From there, subtract the .250"  thick volume of the bore, and you will know for sure.  Guessing is just that, and you will not really know what you've got...

[fekbmax]

What Jay said..
 

[TomP]

It will be too high for pump gas whatever it is. My engine is the .030" bored version of that with domes cut off and it's still over 11 to 1. I'd get those domes milled off if you plan to drive it.

[FERoadster]

I was hoping that someone had used these model pistons at some point and knew what they were.
Pistons rods and crank are in Ashland Oregon and the block and heads are here in Brookings (120 miles apart).
I'm taking the block heads cam intake.... over the 2nd week of April to get it Bored to the +020 and everything balanced, assembled.
I'd have to mill the pistons then balance the assembly? The pistons and rods were  already balanced at some time. I'm changing the rods to a better set.
I'll CC the heads and get an Idea of where the top end sits. Possibly thick head gaskets will help a little.   

Thanks  Richard

[fekbmax]

What's the application of the engine ? Just a cruiser or a hot street strip setup ?
I wouldn't be so hasty to cut the piston's myself if it was a weekend hot rod/strip car. Some good fuel, fuel additive or a bit of race gas, maybe make it up some with head gaskets,  .. Of course I have no idea what your appalcation is.  I have driven my 66 ford/  old heavy trw 12-1's 390 C-6 , slight bit of stall and 3.78 gears on the street for many a year .. Good tune, good cooling system, and a heavy foot = alot of fun.

[FERoadster]

Fekbmax: this is for my 454 FE into a 60 Vette project. Strictly weekend driven longest distance will be about 100 miles.
Dropped I-beam front axle, gutted body just  dash, seats, carpeting & door pads, no conv. top, front bumper removed and panels molded in.
Had one just like this in 1972 but it had a SBC. Traded it for a nice bone stock 62 and the fellow totaled  the 60  about 3 months later (drunk)

A picture of my 62 Vette