Thread: 327 rebuild

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ON the heads ..the 906 heads hold up better if looking for a used vtec head the stock spring pad limits the springs to what can used i cut this to a smaller seal od and open up the spring cup no deeper or bigger on spring id i do cut back second inner step on head. it could cost $700 when all said in done for machine work to a old head casting or a newer 906 used , set of RHS are about $100 more loaded and gone this way on some and iron ealges as well as the older intake will seal up fine on port runner so any intake will fit . head s i listed are a copy of Gm vtec but a much thicker head and a intake head runner of 170 cc same as gm why wast good money on Gm casting ? seen more busted then good? so you have that in the back of your mind ? well i would long with the piss poor deck finish even if new better go to the machine shop and check deck finish o have many time cut a chevy head cast past .004 just to get to the bottom of the wave finish on the deck of the Gm head and seen were the are much like a saw tooth and work on the head gasket fire ring on cc heads never taken any had for granted . many years ago i never did this build the engine if you needed you used better gas but times have changed i CC every head on evey s engine. i build i CC them on the mill to find out were there are at many times there tell tail signs to tell if a casting been heavily milled . if the cc of the pistons is listed on a fully machine piston top i may check one piston. some custom made race stuff can be much harder to check . if i have or re working a piston i use volume sleeves were i check them for cc. i start at first ring up as there is some volume here. as the top of piston to bottom oil rail is about 030 smaller then piston bore size . if piston are not fine but the only thing i can get or customer will not pay or a time deal . for customs then i may move the chamber CC or head gasket to work . if off a cc one way or another will not matter on some builds .this way works very well to is if reworking a piston is to know the gram of pistons and cc with out wrist pin or with how ever its easier for me with out pin. then cut to weight=ccs works out to be about 2.7 grams =1cc . on a fully stock or cast dome finish tops of pitons if i am getting real close to what i feel may not run good on so/so gas i check it . stock stuff i do not spend as much time as on the race stuff. well thats not to say do not know were i want the CR . i know were i want the deck on the block and what head gasket before i start any machine up to make a cut . less there some bad twisted or low spots or need a deeper valve fly cut i stay to the build plan . i am going to know what head gasket size and cc they are.i seen many gaskets out there for stock rebuild head gaskets as much as 060 thick i stay way from cheap head gaskets . the steel plate MLS or a steel fire ring plate teflon/fiber/grafoil facing will not move on the thickness much they may be lested as .041 thick you many seen after used to 002. less. ON Cams ..i would not use a flat lifter less bone shock build. even so i would have hard time buying a Gm cam . many builds i gone to retofit roller. after i go threw all the list of things they must do for a good brake in with a hyd flat lifter cam and tell them i just can not help them if they wipe it and cam company may not help them the roller cam starts sounding good to them and if i build there engine i sell the cam lifters at cost .i do not add any more time on the build if i were to put a flat lifter cam in there engine .so i do not have to hear they wiped a cam .Gm cam and lifers sound good and have a good track record .but still can fail... so then your going to ask for help ? never tired it but would think you may get the brush off at the parts counter . so if i was going to put a flat lifter cam in any thing i would buy a horwards even if it was a bone stock mild RV cam as there max 5 year certified no fault warranty is the ony way to go i did not say much about the flat soild cams as i still used them and feel that a few small steps in prep on lifter and the EDM lifter is a good way to go but hardly use much solids most guys do not want to spend the time adjusting lifters . so most all mild stuff will see a hyd roller cam the after that a go solid roller cam setup.. Well this is how i build them and just glossd over some things other may build them different so far it,s world very good for me