Quote:
Originally Posted by b-man
Side loading of the piston is the biggest issue with the 4.5” stroke, along with the short cylinder of a Pontiac block pulling the piston down out of the bottom of the bore. Short piston life and quickly diminishing ring seal I’m thinking.
To end up with the same 1.57:1 rod to stroke ratio as a stock 455 which ain’t that great to begin with (6.625” rod - 4:21” stroke) you would need a rod close 7.1” long with that 4.5” crank.
Is it possible to put a rod that long into a stock deck block or would you need to go to a tall deck block? I’m thinking there’s no way to move the pin that far up into the ring pack on a stock block.
Makes me wonder exactly how GTO Jones is getting away with that 4.75” stroke in his 571. Which block standard or tall and what rod length?
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I started talking to BES (Tony) on what I wanted to do and ended up with Kauffman MR-1 block and a Ohio 4.75 crank custom Ross pistons, 6.7 Eagle rods . He didn't have a problem with it and I wanted it pump gas. He re-worked the E heads I had with bigger valves and ported them. He said he could get 1000 Hp with better heads, but not on my budget. We put the motor in in 2015. After a couple of years I retired and moved to Arizona I had a lifter fail and eat a lobe off the cam (solid roller) so I talked to Paul in Tuson and he spec a hyd roller that works great. I drive it everywhere. We (my son and I) made some other changes like 4L80E and 3;42 gears and a super snipper so when we make a trip to Phoenix its a 200 mile round trip I get a little over 15 MPG. Went to the track once with the new combo come out EZ and still ran a 10.74 at 128. Need to go back before it gets hot. Not bad for 4000 lbs. with me in it. Thats my story and I'm sticking with it lol.