What is this conversion kit that you mention? jhd >The `65s are the best 40HP heads made, if they're in >good condition they'd be my first choice. If you do >need to use the long-rocker-stud heads, install >conversion kits and they'll be OK too (with the >conversion kits you can adjust the lash to ~.006", >same as the later heads). >Why do you think extra piston deck or semi-hemi >cutting will be needed? The stock 40HP C.R. is plenty >conservative, will run fine on the cheapest gas >around. >CC the heads and measure the piston deck to be sure, >but even if the deck is as low as .050" with 40cc >chambers you'll still be under 7½:1....I expect you'll >find it more like 7:1 with the stock 77mm bore, it's >only if you go to big-bore (83mm) pistons that it's >likely to be an issue. >Besides the head-stud length there are also subtle >differences in the pushrod length and rocker block >dimensions, stuff you may need to deal with to get the >rockerarm geometry right on any engine but more likely >to be an issue when building a 40HP out of assorted >parts. I'd try to use the `65-up 1.1:1 rockerarms >rather than the older 1:1 items. > >--- [EMAIL PROTECTED] wrote: > >> Ok,I going to restore my uncles 1963 beetle. I have >> the original engine >> which I'm going to rebuild.It came with boxes of the >> parts. I have a pair of >> fresh(less then 2000 miles on them) rebuilt heads >> with the long rocker studs.It >> is my understanding, that back in the day these >> engines had a high cylinder >> head failure rate.Now,I also have a pair of >> remanufactured 1965 40 horse >> heads and the correct cylinder head studs to up >> grade the engine case .I have a >> few opinions here ,should I use the long stud >> heads,up-grade with the short >> stud rocker kit and shim the barrels to lower the >> CR. Or maybe just use the >> 1965 heads,have them semi-hemi cut to lower CR >> ,install the correct cylinder >> head studs and go that way.What do you think? >> Engine will have new oil >> pump,piston & cylinders,rebuilt >> rods,cam,lifters,new bearings etc.Car will be driven >> >> only for recreation. > > > > >____________________________________________________________________________________ >Be a better friend, newshound, and >know-it-all with Yahoo! Mobile. Try it now. >http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ > >_______________________________________________ >vintagvw site list >[email protected] >http://lists.sjsu.edu/mailman/listinfo/vintagvw
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