I am about to rebuild my 1990's NA Engine, Complete overhaul. I want power. I've got Toyo Proxis T1/s Tires on it and they don't give for nothing... And I want to smoke the HELL out of them! I am considering Nitrous, which seems to be the cheapest way to go. I am going to give it a valve job, and have the head ported and polished. What do you think? Any recomendations?

Hi. I read your comment... I am not giving u any recomendation..( cuz i have some question to ask you..) how much is it to do that Valve job and have the head ported and polished? I want to do that for my supra too. and actually .. what does it really mean buy doing the valve job and have the head ported and polished ( i know i am asking some stupid question... but i want to know more =) . thank you very much in advance . =)

Neither one of you specified whether or not you had Turbo cars, but if you do porting and polishing ( which is basically using a dremel type of tool and going down the air passages to the valves and relieving some of the porousity of the metal on the walls so the air entering has an easier path with less turbulence or tumbling effect when it travels to the valve pocket where the valve is seated waiting to enter the combustion chamber. This stuff works real nice if you've got a 440 Dodge or a 454 Chevy with a carburetor ; but actually since you perhaps have a Turbo engine, the Turbo forces the air into the engine under boost pressure. You'd be better off with some HKS or Greddy stuff beginning with a big exhaust pipe, a bigger low restriction air inlet, a bigger injection program, and more boost achieved with an EVC box, allowing you to adjust the boost yourself from the factory setting of 6 to 7 psi to about 12 to 15 psi boost. You'll need a new boost guage to tell you what you're making for boost, but you can see gains without nitrous of 120 to 150 more horsepower and beyond. Also install a new larger intercooler. I just did in my '93 and it's now a rocket!! I sold my favorite '88 Yurbo sportroof last year and this newer model is bigger looking on the outside but smaller and shorter on the inside, despite being derived from a Lexus SC300 coupe. Any more questions I can help you with? Call HKS in Torrance, CA (L.A.) or on the internet.

Well. actually.. i have a NA 88 SUpra... Does it make a different if I do that Porting and polishing?? and usually if I do that how much will it cost?? just wondering..Thanks.

Is this thread dead?? Well here is my 2 cents & keep the change by the way. :-) It will be very hard & very expensive to make 250 RWHP in a 7MGE.<br>If you can make over 250 RWHP in a 7MGE with out adding a turbo then your da man or da woman :-)<br><br>Try this out: Drop in a 7mgte (www.soko.com apox. cost $800) get you a 7MGTE ECU & Harness (1989 or up) Apox $200, also a stock or upgraded IC & IC pipes apox. $200-$1100 upgraded. After that is installed add a K&N FIPK or other intake apox $130, custom 3"ID exhaust from turbo back, apox $500, HKS Fuel cut defenser apox. $110 & a electronic boost controler apox. $300-500. Set the boost controler to 14 psi & you got ya over 300 HP for less then $2500 in parts<br><br>Steve<br>www.kyanasupras.homestead.com