Posted By: d100dragracer
427 or 440 small block build and why one over the other - 10/22/11 02:33 AM
I am in the process of getting close to finishing my small block stroker race engine and have a couple of options as far as the stroke I will use and wanted to hear opinions on here as to which way you guys would go and why one is better than the other.
What I have is a set of JE dome pistons made for the Indy cnc 245 cc Indy heads I have that Ryan J setup for me they are 4.06 bore 1.200 comp height. I have to different sets of rods I could use both are small journal chevy size one set is 6.2 the other is 6.3 in length both are steel rods.
This will be used in Speedomotive Uber 318 block if you are not fimilar with their Uber block they sleeve all 8 cylinders mine is suppose to be good up to a 4.115 bore size but I will be using the above 4.06 pistons the block has already had the lifter bores bushed its been line bored and decked to run Cometic gaskets with a deck height of 9.554 it has the Milodon splayed caps not looking to hear about they wont work I will run it till it blows if thats first pass or if it runs forever.
Here are the choices for crank 4.125 with the 6.3 rod which will be a 427 it will also have more compression it would actually push the piston above the deck 8 1/2 thousands.
Or 4.25 crank with the 6.2 rod which will be a 440 it will have less compression the piston would sit 29 thousands below the deck.
Which way is best and why? The piston being above deck 8 1/2 thousands is that going to be a problem on the one setup or will a thicker head gasket be the fix?
This will be run in a tube chassis D100 dodge pickup fiberglass front end with a powerglide and 5.38 gear 16x33 slick mostly 1/8 mile racing.
Maybe Ryan J could chime in, he don't know it yet but he is going to assemble it and dyno it for me in the near future also he ported a W2 Holley Pro Dominator tunnelram for me to match the Indy heads. I have a set of C&S Aerosol 1050's I want to try with the tunnelram against a Indy single four with a 1050 Holley on it. Thanks for your opinions.
What I have is a set of JE dome pistons made for the Indy cnc 245 cc Indy heads I have that Ryan J setup for me they are 4.06 bore 1.200 comp height. I have to different sets of rods I could use both are small journal chevy size one set is 6.2 the other is 6.3 in length both are steel rods.
This will be used in Speedomotive Uber 318 block if you are not fimilar with their Uber block they sleeve all 8 cylinders mine is suppose to be good up to a 4.115 bore size but I will be using the above 4.06 pistons the block has already had the lifter bores bushed its been line bored and decked to run Cometic gaskets with a deck height of 9.554 it has the Milodon splayed caps not looking to hear about they wont work I will run it till it blows if thats first pass or if it runs forever.
Here are the choices for crank 4.125 with the 6.3 rod which will be a 427 it will also have more compression it would actually push the piston above the deck 8 1/2 thousands.
Or 4.25 crank with the 6.2 rod which will be a 440 it will have less compression the piston would sit 29 thousands below the deck.
Which way is best and why? The piston being above deck 8 1/2 thousands is that going to be a problem on the one setup or will a thicker head gasket be the fix?
This will be run in a tube chassis D100 dodge pickup fiberglass front end with a powerglide and 5.38 gear 16x33 slick mostly 1/8 mile racing.
Maybe Ryan J could chime in, he don't know it yet but he is going to assemble it and dyno it for me in the near future also he ported a W2 Holley Pro Dominator tunnelram for me to match the Indy heads. I have a set of C&S Aerosol 1050's I want to try with the tunnelram against a Indy single four with a 1050 Holley on it. Thanks for your opinions.
