I have finally decided im going to dump some cash into my 89 mustang. I currentlyonly havejba headers, bassani offroad x pipe, magnaflow catback, underdrive pullies, and cai, and I noticed it had a double roller timing chain when I replaced the pan gasket. My engine is still in good running condition with 90,000 miles and tomarrow im buying a 70DO0Eported 351w heads machined for 7/16 rocker studs w/ guide plates, 1.6 roller rockers, hardened seats, comp springs, comp cam hardened pushrods, and a x303 cam. I am also getting edelbrock performer upper and lower intake but I need some help with the efi stuff. What size throttle body would you recommend, what about maf and injectors, and the stock fuel pump? What kind of hp gains should I expect over stock? thanks

 

With your setup (incl heads) you can go with 70mm TB and 75-80mm MAF. Your 19# inj would suffice but you can go as big as 30#. Just be sure to have a shop do a tune/calibration. Stock fuel pump should be fine.. not sure about individual gains but with the heads and cam, you will definitely notice a difference.

 

+1^. i was going to say get the 75mm tb. then grab some 24# inj with a 80mm maf.

 

your tb depends on your furture plans... if you done modding then a 70mm is all u need... if u have more plans hten get a 75 cuz ull need it later on... as for a maf get a 80mm pro-m... probably the best one u can get i wish i would have gotten one.... get a new fuel pump if u get a 75mm tb cuz ull need it later on and it wouldnt hurt... as for injectors... if you goin to get a s/c or a t/c then hold on of injectors cuz u will need 42s and u cant run those with your setup rite now... if u dont have ne major goals then getting 30s wouldnt hurt cuz u wont have to buy then again... it depends on you long term goals mroe than nething... if u wanna waste money and dont wanna plan for hte furture and just wanna get what is good now then get a 70mm tb with a 80mm maf with 24# and a 190lph pump.... that is a safe setup for u rite now... but if u do nething else ull have ot waste more money later on to upgrade... so tell us what upgrades u are planing on and we ca give u a better answers

 

Well basicly I want heads, cam, upper and lower intake, roller rockers, and all the other little bolt on's right now. Then im going to do alot of suspension work and repaint and about a year or 2 down the road want to build a 347.

 

Sorry, wrong. You won't need a 75 for a long time, long enough to justify buying a 70. A 73-76mm MAF will be perfect, just make sure it's calibrated for your injectors. Pro-M is alright, my C&L hasn't done me wrong yet. Speaking of injectors,your 19's will do fine right now, with your setup and a stock intake. If you want to upgrade anyway, 24's will do good. Don't forget..calibrated.A bigger fuel pump wouldn't hurt, and get a fuel pressure regulator.

PS I bought 30lb injectors and a 255lph fuel pump. Way bigger than I need right now, but I won't have to buy bigger ones later. I did this because with a fuel pressure regulator, neither of those will hurt performance. A tb that is too big, on the other hand, will. Go with a 70. Really, a 65 might even be alright for you right now. But 70 is a good way to go

 

Im putting on a edelbrock performer intake the same time as the heads and cam

 

I'm not sur how old this is but I have an edelbrock performer intake and in order to get a nice cam and make the most power I have to loose the performer intake. So I would suggest going with a sytemax 2 intake.

 

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