Changing my mind. Going to a 5.8L instead of a 7.5L

Topic: Changing my mind. Going to a 5.8L instead of a 7.5L (Read 5074 times) previous topic - next topic

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #30 – November 29, 2009, 10:17:53 PM

Definitely would be the best time to replace the heads. If it's within the budget, I would say go for it.

Good luck,
Don

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #31 – November 30, 2009, 05:31:51 AM

If your going to get new heads, and you want the car to move okay, I would save up for some slightly better heads. The gt-40X's are a mile above stock, but the 5.8 needs more air then a 302.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #32 – November 30, 2009, 05:14:42 PM

But for the price of GT x heads............They are way better so I was thinking what the hell. And for the price I was going to do some porting. Wake them up a bit. But now what intake? Pro Products, Edelbrock, Trick flow, Ford lightning?

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #33 – November 30, 2009, 06:12:55 PM

If your going to get work done on them, like porting/new valves and machine shop stuff, you could probably buy NEW aluminum heads for around the same price. If you do a search you will know what intake to run, and if your going through the effort of changing heads, you might as well get rid of the truck cam shaft. Honestly, you would be better off with a 302 if your going to only use stock parts and not really upgrade.

If you stuck with a 347 ot 363 stroker, with all things being equal between that and the 5.8, the stroker would out run the 5.8, or at least should. As well as being cheaper for virtally every part.

The 5.8 uses larger main bearings that will just slow the motor down compared to a 302.

For the lightning intake, your looking at $400 as a good price for a lightning lower and a cobra upper. You could buy a new cobra setup for less then just the lower.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #34 – December 02, 2009, 09:47:28 PM

No . I am just going to so some bowl and minor porting. Not anything radical. An I am not using the truck cam. Its gone in favor of a 95 GT cam with 1.7 Rockers. I may look at the TFS 1 cam but not sure how that will work. Then I have to figure out an intake for the car. I was looking at the knock off Edelbrock.

Oh and when it comes to the stock 88 5.0L in the car and the 5.8L that I am going to put in it..........the 5.8L is a huge upgrade.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #35 – December 02, 2009, 11:29:57 PM

If I were going to spend close to $1000 on heads, I would just save another 4-500 for a good set. Seriously though, you will need to open it up and put bigger and better stuff on there then a 302, otherwise, there is no real reason to "upgrade" to a 351.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #36 – December 13, 2009, 05:07:58 PM

So now I have the heads ported. I just need to send them off to get the deck resurfaced. I got a TF stage one cam to be put in and a 351w typhoon intake with a 70mm tb. I hope after christmas to be bolting it all up.

Haystack:
If I were going to spend close to $1000 on heads, I would just save another 4-500 for a good set. Seriously though, you will need to open it up and put bigger and better stuff on there then a 302, otherwise, there is no real reason to "upgrade" to a 351

Haystack. I have a question. What kinda of engine am I building up for my car? You seem to know what I am building and it does not seem to be what I want to build. You tell me that a 351 is not a a good upgrade if I am not puting "good" parts (302) on the engine? That a stroker 347 or 363 is a better way to go? Well for your info the car is for cruising in the spring/summer. Not a drag car or not a high HP/TQ race car. Just a street car. With my choise of heads and cams and parts, this car should put close to 340hp with 420tq. Yeah, your right, that is not really an upgrade from a 302 that put 140 hp and 200 tq. And the engine slowing down because it has bigger mains then a 302?!?!? What the hell? You are going on about race engines.....I SAID STREET CRUISING. I have been on a few other sites and there are some dip shiznits that keeps saying, "302 parts on a 351w makes 302 horsepower !" Well Most of the 351w parts are 302 parts. Hell a stock 351w F4TE engine with gt X heads and E303 cam makes 350 hp From FRPP.Thats seems pretty impressive to me with 302 parts.

Sorry. I had to say something because it is a broken record everytime I ask questions about 351w swaps. Nobody askes me what my goals are, just that I am doing it wrong. So far with engine included, I have spent $1000. Thats it. Thousand bucks will get me a nice engine with twice the torque/horsepower than the stock 5.0L engine in the car now. Seems to me like a good move on my part.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #37 – December 13, 2009, 08:51:38 PM

Quote from: Haystack;300670

The 5.8 uses larger main bearings that will just slow the motor down compared to a 302.

Yes they may have larger mains, but that doesn't mean that they slow an engine down......funny, I had a 69' mustang fastback w/ a 351W bored .030 over that idled like it was barely running @ 1200, I drag raced the car and it was shifted at 7000 rpm. Hmmmmm didn't seem to me that it was slowed down any by the bigger mains. I know that 86caprirs's car is for the street and won't be seeing that kind of abuse, but get real dude. I wish I still had that car

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #38 – December 16, 2009, 05:20:53 AM

k, lets look at it this way. Lets pretend everything was equal between a 347 and a 351. Same heads exhaust car everything. The 351 should be slower.

And to the OP, it is your motor, and it is your car. Do what ever you want with it. If your going to choke the 351, there is no reason to upgrade. Yes the truck 351's used the E7 heads. It also made 210hp and 315lb of torque. Alot better off then the mustang, with a much larger engine huh? That is with a worse cam, but it is suposedly built for torque.

gt-40's are better then the stock heads. No doubt about it there, but if your going to spend all the extra money on them, and for close to the same price, you can get good heads, why waste the money?

And about the whole 340hp, its just a number. You could have 500hp and still have a slow car compared to another car that has 400hp.

But hey, its your money, your motor. I will not post here again if it will please you.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #39 – December 16, 2009, 09:32:43 PM

The 347 and the 351w cannot be compared. Again, you are dealing with a stroker kit in a 302.

How am I choking the 351w? You are looking at a high HP engine again. I want torque. For what I paid for the heads cam and 1.7 RR is nothing compared to a new better head. TF heads are $1200.Thats twice what I paid with everything I got above. I guess your vision of a 351w and mine are way different...I get that but you have to sit there and tell me I am wrong with everything I am doing? I am happy with what I am doing. Thats all that matters to me. I want my car to stay street car and not a car that is going to be only drivin on weekends from pump to pump. 400+ ft pounds of torque is just fine with me. I think it may be a little too much but I can accept it.

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #40 – December 17, 2009, 04:19:38 PM

Hey man, sounds like you got a good setup going. I've seen untouched "X" heads go over 460hp on a 393W...You'll have plenty of room with those. Bearing speed in a street car is almost a non-issue...yeah, in an endurance race engine, it'll become an issue. A 363(302 based) stroker isn't better for the street than a 351, not in a million years...gee, lets see here....spend over $2,600 for an aftermarket siamesed block, or get a good running 351 or even overhaul a 351 and be almost $2k ahead of the game.

You're gonna have a real runner when you're all done man, ignore Haystack, when it comes to engines he just spews what some backwards schmoe-bag wrote on some kiddy forum. They love throwing big technical points out as a down-side when it is completely irrelevant...lol.

Good luck,
Don

Changing my mind. Going to a 5.8L instead of a 7.5L

Reply #41 – December 17, 2009, 11:17:26 PM

thanks sick. I kinda figured that because I have seen and heard the same thing on other sites too. Like a broken record.