some HO conversion questions!

[merkman86]

ok, heres the deal, i dont want to do the whole HO conversion, but am wondering what conversions i can do without having to change my lopo computer. im thinkin intake for sure, but am not sure if i can do the HO heads, or if i could put 1.7 rockers on my stock lopo heads. if u guys have any suggestions, let me know. also i have a question.... i have a mustang tb but it looks different than the ones ive seen on the web, it has no tv cable lever thing and its made by holly, im wondering if i should get a new one. if anyone has an HO tb, let me know, thanks alot!!!

[91LTDProject]

you can do everything you do in an H.O conversion cept for computer, cam, changing the firing order and injectors, but if your going to that much wok, its not much more to just do the whole thing and be much happier in the end. post a picture of this throttle body you have. may have an aftermarket performance one, unless holley made tb's for ford, which I dont think they did, but I could be wrong.

[merkman86]

but can i put 1.7 rockers on my lopo heads???

[91LTDProject]

i dont know enough about valvetrains to give you an answer. Its a possibilty, but on a set of stock heads, probably not worth it at all. The stock E6 heads are pretty bad from the get-go, and the little bit extra lift the 1.7's provide on the valves isnt going to benefit a stock lopo. I'm not the best person to be talking to, since i'm mostly going by memory of everything I have read on here/net/books, learned in school, and have not yet performed an H.O conversion, just read everything I could possibly find. But reading dosent match hands on experience, and thats something you just have to figure out by yourself sometimes.

[monterey1962]

but can i put 1.7 rockers on my lopo heads???

No, Lopos use 1.6 rockers, if I remember right. Why waste the money, just upgrade the heads.

[OVERKILL]

The 1.7's require better valve springs or you are going to float the valves. Running 1.7's on the E7's will work though (with better valve springs).

You can change everything except the camshaft (and injectors) and still retain the stock ECM, this includes the fitment of 1.7 roller rockers.

[gadget73]

You can install a 1.7 rocker on a lopo. Not sure how much help it will be, but it is possible, and it does work. Driven a 200k+ lopo with 1.7 rockers. No valve float and it screams. Changing out the heads will do more for you but it is possible to do the rockers.

[OVERKILL]

You can install a 1.7 rocker on a lopo. Not sure how much help it will be, but it is possible, and it does work. Driven a 200k+ lopo with 1.7 rockers. No valve float and it screams. Changing out the heads will do more for you but it is possible to do the rockers.

Perhaps the stock lopo cam is mild enough it doesn't float the valves............?

[85crownHPP]

you can do everything you do in an H.O conversion cept for computer, cam, changing the firing order and injectors, but if your going to that much wok, its not much more to just do the whole thing and be much happier in the end.

I beg to differ... exchanging the cam requires removing the timing cover/chain and is no small task. Other that that everything isnt super hard unless you're a newbie

[OVERKILL]

Not shure if there is any or much difference between lopo and ho valve springs. The increased ratio increases spring pressure. Mostly depends on the condition of the springs if there wore out there wore out.

I wasn't comparing the springs, I was moreso comparing the camshafts, the lopo cam being substantially milder than the HO one. There are enough examples in the Mustang community of guys slapping on 1.7's and then floating valves like crazy that I know it can be an issue. It's one of those things that if I'm going through the trouble of changing heads, that the new heads are going to have good springs on them. The 1.7's are also a fair bit harder on valve springs than the 1.6's are.

[91LTDProject]

It is alot of work, but if you allready have gone as far as removing the heads, most of the accessories have been unbolted from the front. Hardest part is pulling off the pulley and balancer from the crank. I guess I worded it wrong, its alot of work, but if your going as far as doing heads, just do the rest.

[merkman86]

so taking off the heads is a hard meneuver eh, because i was thinking of takin em off because i think i can hear a little valve tick goin on, i dont know if its a big deal or what, tell me what u guys think.

[gadget73]

Mild tick is probably ignorable. Isolate it with a stethoscope to make sure exactly which valve it is, and if it is actually the valves. Could be some other similar noise.

[OVERKILL]

Mild tick is probably ignorable. Isolate it with a stethoscope to make sure exactly which valve it is, and if it is actually the valves. Could be some other similar noise.

Agreed, like a small exhaust leak.

[merkman86]

its definately not an exhaust leak, and it only does it when its warm, it comes from the passengers side of the car.