4v heads on 2v block

[sonic281]

Call me stupid, but why do you need a rotating assembly, pistons, flywheel, alternator, and injectors?



Depends on your overall goals for the motor. The Trickflow heads are great, don't get me wrong, but they really only show gains over ported stock heads at much higher RPM. From 5000 rpm downward, the ported PI heads will probably make more power. Up to 6500ish, the gains are marginal. But at 7k+ rpm is where they REALLY make a lot of power.

That being said. Most folks don't build a street motor to make power at 7k+ rpm.

(Disclaimer: I don't have any first hand experience with these heads, but it is what I've read multiple times now by people who do know.)

Personally, I'd shoot this guy an email if you are really serious about building a motor. Modularheadshop - MHS

just lookin for a quick n/a street car but i think i might sell this car keep finding things more and more wrong with it everyday

 

[1bbcd5]

Great thread! Also my favorite view.

 

[sonic281]

Great thread! Also my favorite view.

the is no image

 

[lushdog1984]

Soooo, a Cobra or Mach needs bolt-ons or it will get smoked by your stock GT (non-5.0)? You must be lining up against some really crappy drivers.

lol i dont think every one i came across had a bad driver. just crappy performance. and i was talking bout the 96 -98. read the thread. di they even make a mach then. hmm

 

[lushdog1984]

Early 96-98 Cobra's were not easy to drive and get good 1/4 mile times. That's why you see so many 99+ GT's hanging with them. In your case, your friends just didn't know how to drive them well enough as it doesn't take much to drive a 99+ GT (in other words they're consistent cars at the 1/4, whereas the 96-98 Cobra's are quite picky).

well i dnt no bout them not bein easy to drive. i have driven both and to me theres not to much difference other then a lack of low end. im not sayin i have a supercar here im just saying of all the 96-98's ive came across none have won a race from a stop or a 30 mph roll. and yes alot of the people i drive around with are great drivers and know how to drive their cars quite well. they have drove my car and said it pulled harder and ran stronger then their cobras. had a friend try to trade me his mystic cobra for my gt cause he liked how my cars power hit harder and came on stronger then his. this is just one mans opinion. not sayin anything bad bout the 96-98 snakes but i havent had a prob outrunning them. even in a 1/4 run

 

[turbogt]

Although if no other mods are done, a 4V has better performance, I'm getting 500+ at the rear wheels on 91 octane. I can barely get traction with that and not much can hang with me, even at that level. I stick the programmer in my car, change to 100+ octane fuel and and 2 minutes later I can get 650rwhp. If I change the pulley and do a little more work, I'm probably looking at 750+ rwhp. So if you think you need more than that, go through the headache of a 4v swap. It's just not necessary any more.

You gain 150 rwhp just by changing your tune from 91 Octane to 100? Lmao, I've heard it all now