It didn't take me long (less than 3,000 miles) to figure out that 11:1 compression is a little too high for my (now daily use) 340, so they gotta go. They are +0.020 bore and I'll throw in new cast top rings. $75 firm plus $20 to ship em. Thanks
What made them 11:1 C.R.? Were they made that way and advertised as such? Are they race piston's? I'm a high compression kinda guy. I like engines with hi-comp. If you keep trhem cool enough 11:1 would work for me on the street. It's just the oversize that bothers me. Just wondering. PONCH
the 11:1 pistons were the ones in the 64 aluminium head motor. I almost was gonna order the same thing for the 340 build im working on.
i believe these will also fit the 300 engines as the 300-340 are the same bore. I see TA lists the same part number for both engines so yes these pistons will fit the 300 engines
Ponch... I'm not sure what make them 11:1. I'd guess it's the placement of the wrist pin. If the pin is a little low the compression goes up... and a little high brings it down. These were made as 11:1 when used w/ factory rods and heads, and they are flat top pistons so there is no clearance issue. I run the TA 284-88H cam which has higher lift (0.460) and I had no piston clearance issues, but it (the cam) did smash a set of valve guide seals... but that's another story.
Hi Drew, I asked Denny Manner about it and he told me they went from 11:1 in '64 to 10.25:1 in '65 because Aluminum could transfer the heat better. Also the Iron Heads had a little larger volume combustion chamber but couldn't remember if they did anything to the piston's. The Piston's in my '65/300 are flat top. I have Two other set's that are flat top too. I just go with the 10.25 figure and call it good. Now if it was 8.5:1, I'd have to do something about it!! I put 3.8 V6, 10:1's in my '72 / 350 and used .02 Head Gasket's. The piston's and Gaskets were advertised by Poston (RIP) to give 10.75:1 Ratio. I figured with a 10-20% B.S. factor i'd be running around 10.5:1. I don't know if there was any difference in the Head Gaskets from '64 / '65 engines. I know there was in the 350's between '70 - '71. 70 was .02 and 71 was .04. I used the .02 on my 72 because I was told it would work, and it does. As far as the oil seals being smashed, well I know what you mean. I cut the bosses down on my 300, both in and ex. and put seals on them all. I forgot to do it on my 350 ex. bosses and the seals are a little shorter than when they were new. But whan I yank it this Winter I'll fix the problem. The thing is tho, I plan on taking the 340 down to the crank. When I do that, I want to do the 300 at the same time. But I'm still hopeful that I can do the 425 swap, so I would like to re-do it too. SOMEBODY STOP ME!!:spank: PONCH The 455 is still half done. HMMMM.
Still available at a great price. Ponch, my original plans were to run the aluminum 300 heads that were to be reworked with larger valves and ports but then the money dried up.
