<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><img apple-inline="yes" id="FC4D7EEC-91B2-4557-A4DD-57AF8020372E" src="cid:B986BFB2-F265-46C8-A7E8-2ACE33E9D502" class=""><br class=""><div><br class=""><div class=""><font color="#4f7a28" class="">Sean</font></div><div class=""><font color="#4f7a28" class="">I will share some of the mastications I have been going thru as I continue on the resto-modding of my 55 TR2 with 3B block, 4A head and manifolds, 89 mm bore, etc</font></div><div class=""><font color="#4f7a28" class="">stock head was shaved initially by having 0.020 removed to eliminate some prior scars (3.330 - 0.020 = 3.310”). Chamber had some minor work to smooth out sharp</font></div><div class=""><font color="#4f7a28" class="">edges, and relieve some of the shrouding resulting in a chamber area of 61.75 average cc’s for a static CR using a 0.032 copper gasket of 9.43 +/-</font></div><div class=""><font color="#4f7a28" class=""><br class=""></font></div><div class=""><font color="#4f7a28" class="">Had an add’l 0.020 shaved to eliminate some careless scars from some add’l chamber work resulting in an average chamber cc of 62.38 and still using the 0.032 copper</font></div><div class=""><font color="#4f7a28" class="">gasket (Mordy D) yielding a CR of 9.35+/-</font></div><div class=""><font color="#4f7a28" class=""><br class=""></font></div><div class=""><font color="#4f7a28" class="">Did some more shrouding work and sent head out for some manifold port matching and roller rocker alignment work as well as an add’l 0.010 head milling (so 0.050 </font></div><div class=""><font color="#4f7a28" class="">total material removed from the stock head for an new height of 3.280”), with a better smoothness ratio for use with Mordy’s 0.022 copper gasket. Also to have the </font></div><div class=""><font color="#4f7a28" class="">shop cc the combustion chambers after the work is completed. Aiming for a final CR of around 9.75+/-</font></div><div class=""><font color="#4f7a28" class=""><br class=""></font></div><div class=""><font color="#4f7a28" class="">Motor has 270 duration cam, Moodys 5 dummy main billet crank, Corrello rods, BFE 89 mm piston and liner set, IJ teflon crank scraper and baffles, uprated oil pump with Dodge </font></div><div class=""><font color="#4f7a28" class="">Ram pickup from IJ, SS valves with oversize intake and hardened exhaust seats. HS roller rockers on hardened shaft and alloy pedestals. Crain electronic ignition, Fidanza alloy</font></div><div class=""><font color="#4f7a28" class="">flywheel, diaphragm clutch, ATI super damper, alloy front motor plate, alloy rocker cover and sump, alloy radiator and soft start electronic fan with thin belt conversion to uprated </font></div><div class=""><font color="#4f7a28" class="">water pump and alternator. HS6 carbs on 4A intake and exhaust. Gear reduction starter. Toyota 5 speed, Quaife diff with 4.11 gears and alloy drive shaft, 4 wheel disk brakes, 4</font></div><div class=""><font color="#4f7a28" class="">wheel tube shocks, uprated front spindles and alloy hubs, RATCO frame modified to take full TR6 front suspension including front sway bar. Oil cooler with thermostat and spin</font></div><div class=""><font color="#4f7a28" class="">on filter. Hope to be on the road soon!</font></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">On May 4, 2021, at 5:02 PM, Sean Alexander via Fot <<a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a>> wrote:</div><div class=""><div dir="ltr" class=""><div class="">Please share the combustion chamber volume and head thickness for different setups that have been tried on the TR4 head</div><div class="">Sean</div><div class=""><br class=""></div><br clear="all" class=""><div class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><br class=""></div><div class=""><span class=""><span style="font-size: 15px; font-family: Arial; background-color: transparent; vertical-align: baseline; white-space: pre-wrap;" class=""></span></span></div></div></div></div></div>
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