Technical > Matt Shaff's Engine Shop

The Nostalgic 265 Engine Build

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Van:
Roger's info is correct, but in your case the issue is the block is way to tall for that short stroke. The best fix is to run a long rod, this moves the pin up in the piston. The now shorter piston just lost a lot of weight and with the pin higher in the piston the side thrust is way better. Go to any piston Co. web site and look at MODERN racing pistons, they are very short & used with long rods. Compression heights around 1.0 to 1.2 are the norm in small blocks. 

bfalfa55:
Thanks for all the engine info. I think I will just stick with what this engine is for my street/strip fun. I am thinking about building some nostalgia race car of some kind. I have more 265's to choose from in the garage !

bfalfa55:
FINALLY a positive, forward update. My oldest daughter is now married, so I can spend some money !

I did a full cc job of my dome pistons in the bore. I will be right in the 10.5:1 compression ration depending on what head gasket I use. I have to use 350 style due to the mods the previous owner did to the top of the bores. So, my question is: what is the thinnest 4.03 bore diameter gasket I can use that will work with my L98 aluminum heads ? If I use a shim style gasket I will be around 10.68:1 if I use a .028 thick gasket I will be around 10.48:1.

I don't care if the gasket is pricey, as long as it won't cause me issues with the aluminum heads.
I also must add, piston is .015 down the bore, so I can't go too thin.

jeff/21:
less than .030 between the pistons and the head with steel rods and normal piston clearance I run pistons on the loose side so i need a little more you can get shim gaskets .016-.018 thick and you can get gaskets that measure your bore size most of the gaskets I use are custom

Roger:
Just put together a street machine engine with steel shim head gaskets. Used a 0.015 thick gasket and when visiting with a company rep, he told me the final compressed thickness of the gasket is between .022 and .024 inches in thickness. That is because it is embossed (stamped) round the holes. You can’t compress it back to original shape cause the stamping process stretched the metal. An option is to use a Multi Layer Stainless steel gasket (MLS). You can get one that has a 4.06 bore and is .027 thick, even when compress cause it isn’t embossed (they also come is various thicknesses). Shim gasket $45, MLS $150. Both work with aluminum heads, should work with your compression ratio, and both need smooth surfaces to seal correctly. Hope this helps.

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