shannon said:Ok so far guys I have bought a 6.535 connecting rod. I'm trying to find a piston (preferably a dome) to bring up my compression ratio to 10:1 - 11:1. Keep in mind I'm using the stock oval port 113cc heads. I'm not sure if they are open chamber or closed. It is written on the heads 366. #473328 on one head. #336781 on the other. Please keep it simple. I need to know what piston specs I need to find. Summit Racing and icon Pistons both have given me formulas but Fast talking leaves me confused. I understand my stock compression height is 1.765. I am getting conflicting information because one says my compression ratio will be close to 9:1. I don't know if that means flat tops or Dome. I have thought about getting the original L88 Pistons.I don know. I was told I should be able to use them and other passenger /performance Pistons because I've already made up the .400" difference by using 6.535 rod. Later on I plan on changing the heads to an upgrade. But I want to be able to have decent Pistons that clear the stock heads and valves. I say this with respect, you old timers should know the formula so I can then use it to figure out what piston I can use whether it be flat top or Dome. Again please keep it simple. I am not building a stroker engine. I'm building a 427 tall deck engine with a 550 lift cam. Thank you for your time.......again.
with a tall deck block deck at 10.2" and a 3.76" stroke crank and a 6.535" connecting rod
remember deck height 10.2"
minus rod length, 6.535"
minus 1/2 the crank stroke length 1.88"
equals the piston compression height. 1.785"
this is an excellent example of why doing the math before you purchase parts is so important
http://www.enginebuildermag.com/201...ton-compression-height-and-crankshaft-stroke/
https://www.uempistons.com/index.php?main_page=calculators&type=piston_comp
http://garage.grumpysperformance.co...tall-deck-engine-mods.14632/page-2#post-78510
http://garage.grumpysperformance.com/index.php?threads/can-you-plan-for-quench.11298/
http://garage.grumpysperformance.com/index.php?threads/casting-numbers-vin.93/#post-29340
336781.....73-85...oval...OPEN...454, 118cc chamber, 256/114cc ports
473328.....68-69...oval...OPEN...366T
a few related and useful threads,
http://garage.grumpysperformance.co...gine-to-match-the-cam-specs.11764/#post-55571
http://garage.grumpysperformance.co...y-in-building-a-good-engine.11682/#post-54682
http://garage.grumpysperformance.com/index.php?threads/finding-a-machine-shop.321/#post-3007
http://garage.grumpysperformance.com/index.php?threads/a-few-calculator-links.7108/#post-27382
http://garage.grumpysperformance.co...on-picking-a-shop-to-do-work.5053/#post-28837
http://garage.grumpysperformance.com/index.php?threads/precision-measuring-tools.1390/#post-52469
http://garage.grumpysperformance.com/index.php?threads/types-of-crankshaft-steel.204/#post-15727
http://garage.grumpysperformance.co...ket-race-not-transportation.14229/#post-72588
http://garage.grumpysperformance.co...in-height-compression-height.5064/#post-66240
http://garage.grumpysperformance.co...ing-parts-and-a-logical-plan.7722/#post-51341
http://garage.grumpysperformance.co...onnecting-rod-rod-length-too-stroke-info.510/
http://garage.grumpysperformance.com/index.php?threads/maximizing-piston-to-bore-ring-seal.3897/
http://garage.grumpysperformance.co...ng-combustion-chambers.2630/page-5#post-82766
http://garage.grumpysperformance.com/index.php?threads/tall-deck-options.14678/#post-79151
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