just acouple head questions May 05, 2007, 03:11:57 PM will milling chambers down to 65cc be safe for a SO motor? and can i use 1.7 roller rockers with HO cam with SO pistons? i looked around but i couldnt find any threads. also, the HO cam has .444 lift right? i found a cam with .448/.472, does that mean i can run it at any lift between .448 and .472? Quote Selected
just acouple head questions Reply #1 – May 05, 2007, 03:40:02 PM The 444 is correct.anything bigger is ??? with SO pistons.478 is the ex. on that not in between.Milling the head There's nothing but a nightmare for what your thinkin.I take it your talkin stock E6 heads ? Quote Selected
just acouple head questions Reply #2 – May 05, 2007, 04:03:33 PM oo ok, nope, i found a pair of E7's fully rebuild and they will customize the heads. everything from fully porting to bigger valves, Quote Selected
just acouple head questions Reply #3 – May 05, 2007, 04:28:47 PM Ok for that last time: SO pistons will ONLY ONLY work with stock E6 heads, Trick Flow Twisted wedge heads, or the HO E7 heads and the stock HO cam. Any bigger cam, bigger valves, or bigger rockers WILL HIT THE PISTONS. You CAN NOT use GT-40, GT-40P, Edelbrock, AFR, or any other aftermarket heads if you have stock SO pistons. If you are going to modify your engine to an extent other than a stock HO conversion YOU NEED HO PISTONS. Quote Selected
just acouple head questions Reply #4 – May 05, 2007, 05:56:55 PM AHEM-----Flat tops, ported E7's, custom cam, 1.7 rockers..... lift of .480 on my old setup. Quote Selected
just acouple head questions Reply #5 – May 05, 2007, 06:52:26 PM V8demon, when you say old setup, do you mean with SO pistons? Quote Selected
just acouple head questions Reply #6 – May 05, 2007, 06:54:51 PM so pistons are flat tops, ho's are notched Quote Selected
just acouple head questions Reply #7 – May 05, 2007, 08:45:46 PM They were (and still are 'cause I still use them) forged flat tops. They are not the originals that came with the car, but they have a zero deck height.BTW, Ive been told e7's and flat tops CAN get .500 lift with the right cam/valve moments.And no I dont have the cam anymore......And no, I don't have the specs. There were absolutely no markings on it and the previous owner of the car installed it.It pulled like a son of a b&^$* throughout the RPM range....REALLY well from 2000-4500. With my 3.27's and stock convertor I was having major wheel hop problems when I swapped in my full locking diff. The CHE control arms helped, but it was still there on a hot night on the street. Still is with my current setup, but it's more subdued. It's a little easier to launch the car now and she pulls much better up top. Quote Selected
just acouple head questions Reply #8 – May 07, 2007, 12:43:24 AM Quote from: V8Demon;145062They were (and still are 'cause I still use them) forged flat tops. They are not the originals that came with the car, but they have a zero deck height.BTW, Ive been told e7's and flat tops CAN get .500 lift with the right cam/valve moments.And no I dont have the cam anymore......And no, I don't have the specs. There were absolutely no markings on it and the previous owner of the car installed it.It pulled like a son of a b&^$* throughout the RPM range....REALLY well from 2000-4500. With my 3.27's and stock convertor I was having major wheel hop problems when I swapped in my full locking diff. The CHE control arms helped, but it was still there on a hot night on the street. Still is with my current setup, but it's more subdued. It's a little easier to launch the car now and she pulls much better up top.With stock E7 heads you can get that high of a lift and not hit the SO pistons. I believe that he wants to run a biggger cam (ie E303) and GT-40 or larger heads which will hit the pistons. I have GT-40P heads and with the 1.84 intake valve and .533 lift Comp 266HR cam I have I'd be smacking the pistons on a stock SO block. Hell from what I've read even with the stock HO cam GT-40P heads will hit the piston on an SO block. Quote Selected
just acouple head questions Reply #9 – May 07, 2007, 12:50:53 AM whatever the case,, a thicker headgasket will cure what ailes ya:D either way,, its doable from my notes and hell,, from what i have now,,,lol. i really dont think anyone here would wanna get any tighter with the risk of interferance than i am. I did the clay thing with mine and i swear the clay was so thin, it was translucent when held up to a light. thats why i just settled for the thicker gasket.i cant wait to get rid of this cam anyway,, pita. Not enought lobe separation imho. thats whacha gotta watch out for in an EFI setup (as i was told and did not listen)these heads are stock 54 cc but have been milled .030, ported/polished with larger valves. i have no idea what the cc is now cause any difference was made up in my .040 over bore. Quote Selected
just acouple head questions Reply #10 – May 07, 2007, 12:54:10 AM I just rebuilt a HO and dropped it in. It was easier than worring about really close piston to valve clearance:D Quote Selected
just acouple head questions Reply #11 – May 07, 2007, 04:29:40 PM Quotei cant wait to get rid of this cam anyway,, pita. Not enought lobe separation imho. thats whacha gotta watch out for in an EFI setup (as i was told and did not listen)How many times have I said this? Especially with Speed density!Quotethese heads are stock 54 cc but have been milled .030, ported/polished with larger valves. i have no idea what the cc is now cause any difference was made up in my .040 over bore.What heads were they again? Quote Selected
just acouple head questions Reply #12 – May 07, 2007, 05:10:01 PM Quote from: V8Demon;145481How many times have I said this? Especially with Speed density!What heads were they again?yes you have many times,,,,,,,,,,,,,:D but im not really sure if the CFI falls in the speed density catagory or not. I think it does but i remember there being some differing views since mine was/is sort of CFI.heads are c6 casting. Valves are bigger than the 289HO as well as studed.note how close the spark plug hole is to the intake valve. 1.9 is as big as i could go. Quote Selected
just acouple head questions Reply #13 – May 07, 2007, 05:59:26 PM I feel the need to make a mess of all this by saying my 83's engine did indeed have valve reliefs, 4 of them. But ofcourse it also had D8 heads and a Motorcraft 2150 carb instead of CFI. Probably most of you will never see such an engine :D Quote Selected
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