Ford Big Block cleaning and decoding part 2. 466 cubes high comp?

I spoke wrong, but here is the number for pistons
H418CP30
block D1VE 6015 A2 (1971 Lincoln)
heads D3VE (1973 Lincon)
double roller timing chain (neat i guess)
New intake Edelbrock 7166
Holley Street Warrior 650
rest is factory or unknown without tear down.

[@jesseduke694]

That's not a 11 to 1 engine. You saw that dish in them pistons. What is the casting number on those heads?? You might have a 9.5 to 1 engine? Maybey?

[@Tibbyturnwrench]

@jesseduke694 heads are D3VE. I was not 100% sure to, but I punched the info I had into the compression calculator from Summit, and it said almost 11 to 1. 10.98 something. I the pistons are dished but less of a dish? There are valve reliefs, and the dish looks different from stock pistons. From what I seen the dish on stock pistons take up about ³/4 of the piston surface. Almost like a goofy mouth open smile look, haha. I'm not sure, though. A lot of info on these motors is convoluted.

[@jesseduke694]

@Tibbyturnwrench Well your block has a deck hight of 10.322 unless someone has previously decked it. But even if they have decked it, your pistons do not come all the way to the top. I know, I have a .030 over 460 with forged flat top pistons & I decked my block. My block is 10.300 & my aftermarket pistons are still .013 down. Stock pistons with a stock block can be almost .050 down. Plus your pistons have a dish!!! Now for the heads, if you had the high compression heads your engine would have alil more than 9 to 1. But u don't have high compression heads, you have smog heads! It's a difference of 75cc to 95cc!! So your engine would be lucky to make 8 to 1.

[@jesseduke694]

@@Tibbyturnwrench your engine will have about 7.9 to 1 compression if a felpro stock replacement head gasket is used.

[@jesseduke694]

@Tibbyturnwrench with D3VE-A2A heads you have to use a domed piston to achieve anything above 10 to 1. And 10 to 1 is hard to get using a flat top piston & those heads. The block has to cut & the heads have to be cut to get 10 to 1 using flat top pistons & D3VE-A2A heads.

[@Tibbyturnwrench]

@jesseduke694 definitely need to get some heads then. Was looking at an aluminum set, but they can get pricy. The dove heads can run even more, which is nuts! I'll just have to keep and eye out. For now, it's getting some lipstick and put back in after I clean the frame rails and patch the floors. Thank you for the info.