SHO me some heads!

[supra dave]

for the last few mounts i have been looking and talking to a few different companies that specialize in head work. im happy to say i have found one. they offer the hole shu-bang, head work(port and polish, 3 angled valve job, take all the ruff edges out of the combustion chamber and the flow test the hole thing) intake work(manly port and polish 8 inches in to the runners with BBB) and cams(you tell him what you would like and he dose it). i had a long talk with mister Gude today asking him what all he could offer the SHO community in a head package and what kinds of power gains from his work we could expect to see. happily he said a good 55HP to the wheels and because he flows the heads till he gets the air swill he wants, better power band and better fuel economy. now heres the thing, who would be interested in getting a group buy going on from this head work package? if i can get about 10 ppl, we are looking at about an 1,800 buck package. i will be talking to mister Gude in a week, so if you have any questions for me to ask him about anything i will address it next i talk to him. hope to hear from you all soon.

 

[adidas_kn]

Have you actually showed him the SHO heads? If soo and he's still willing to do it then awesome. You won't see power gains like that with ported heads on a stock 3.0L SHO or even a 3.2L because they already flow way more air then the tiny 3.0L/3.2L bore stroke can ingest. Now if you are doing serious cams and bumping the compression and maybe going with some boost then the ported heads will only make it make power at lower boost and more efficiently. There's a guy in The Dallas/ Fort worth area that does Tony's SHO heads for a decent price.

 

[luigisho]

I'd love to see 55 extra hp with just head work and cams. I think you will need headers, extra compression and/or larger displacement, and a good tune to get close to that much useable extra hp/torque for street driving. You could make a top end screamer but that's not really useable for daily driving.

 

[hawkeye18]

I very much doubt 55 hp is obtainable from those heads. I'd be willing to go in on it if I saw a dyno sheet as proof, but then somebody would have to get it done first...

and it's "shebang"... :laugh_ti:

 

[supra dave]

lol thanks. i didnt see that shu-bang. spell check dosent get them all. i know that Yamaha made a well flowing motor with every thing on it to work to one goal. that goal was a nice, even power all the way to the top of the rpm rang till you almost have the valves dancing on top of the bonnet like lil beautiful strippers on poles, but i trust this guy because of hes work quality and commitment to his work. he is an engineer that has been in the head game for i think all most as long as i have been alive(im still a youngin of only 23). from every thing i have talk to him about makes since and he can do it for a reasonable cost. i can under stand some of you may have hesitations about this due to Yamaha's all ready well designed motor. i will go ahead with my plans to work with mister Gude to try and get this extra power. i will hopefully have this by the first of next year. so maybe i could have some help here now. dose any one know where i can find the stock flow rate for the heads and for the intake manifold. also if you have the flow rate for the stage 3 sho source intake manifold that would be great too. i will contact them any way, it would just be an nice thing to have out there for every one to see.

 

[SHOspazz92]

Unfortunently, Unless you have a highly modified engine (as already stated) working the heads on a otherwise stock N/A SHO is not going to do much, If anything at all. I'm sure this guy knows what he is doing but these gains of 55Horsepower that he is claiming...is well... "Unrealistic"... at best.

-Sam

 

[1993MTXSHO]

I probably spent close to that on my heads, and mine are barely ported. But I agree with the above, 55hp is a 25% power increase, there is no way a pair of heads will do that unless the heads were a horrid design to begin with. Did you tell him how good the design of the SHO head is?

 

[yamahaSHO]

The head work I have done probably doesn't give me a 55hp increase even at 16 PSI of boost.

 

[LOUDSHO92]

A lot of work and testing has already been done with the heads. They already flow more then most V8 heads. With the heads if you open them up any more you loose the low end only to gain a little more on the top. To take advantage of higher flowing heads you will need cams that go beyond what the heads can handle physically.

Also the cam grind may or may not work.

If he is going to claim 55hp you will need to back it up with dyno, if so you will have some orders.

The heads only really need a clean up with maybe bigger valves.

 

[SHO Continental]

I hereby call BS on any 55hp increase claims. I have a set of heads to donate if you think you can prove me wrong.

 

[syP]

im down for sure (next summer at least), but i need proof first

 

[shobote]

$1800 is a good price for that work if it were on another car besides the SHO; I paid $ 1200 to have my Datsun 240z head PP and flowed 15 yrs. ago. our heads are damn good stock; that price is also not including all the time and labor to remove and reinstall the heads; gaskets, etc...Think it is very optimistic that 55 hp can be had when the stock heads already are said to flow more than most modded mustang v8 heads. Yamaha knows what they are doing.
That's a pretty good chunk of change; I would rather save toward a future turbo kit.

 

[93rev2sev]

If we were talking about a 3.0 SLO motor, I would agree.

55HP on a factory engine is usually pretty easily attained from head/cam work.

Not so much on a SHO 3 liter.

I'd guess that head/cam work alone can get you 30-35HP(MAYBE) on an otherwise stock engine...but 55 would be a BIG stretch.

If you get all the other supporting mods (BBBs, higher flowing manifolds or even headers,UDPs, big exhaust, etc..) in addition to the headwork, 55 extra HP is surely attainable.

 

[kconnor]

Does anyone have flow data on the stock intake and exhaust? I saw a figure for the exhaust somewhere that said 190 cfm @25 in. Thats 426 Hemi territory. If that number is accurate and the intake is proportionally as good I don't see a big increase in hp with a port job.

 

[egroce11]

i can under stand some of you may have hesitations about this due to Yamaha's all ready well designed motor. i will go ahead with my plans to work with mister Gude to try and get this extra power. i will hopefully have this by the first of next year. so maybe i could have some help here now. dose any one know where i can find the stock flow rate for the heads and for the intake manifold. also if you have the flow rate for the stage 3 sho source intake manifold that would be great too. i will contact them any way, it would just be an nice thing to have out there for every one to see.

If I read right your new to the community, welcome aboard.

Yamaha did design a great engine that flows great stock. The flow numbers for the stock heads are on the board somewhere unless they were lost during the great crash of 2008. If you can't find them I'll try to find my flow numbers that I've got somewhere. I haven't heard what shosource has for numbers on thier stuff.

Are you going N/A or F/I? Make sure that if you do get this work done that he flows the heads with the runners and butterflies attached.

The cams that Shonutperformance and Shosource sell will handle about anything you can throw at them, but you will have to have the bigger valves and heavier springs. The numbers he's talking about could be reached, but you have to have alot of other mods to go along with it.

There are alot of people here that will argue with me, but, I believe the more air you get in the better any engine will run. And you can get it to run on the street, but good luck on keeping tires on it.

I've got the least power, lowest reving, and slowest N/A motor in a sho car when I can keep #5 rod bearing in it.

Do it, and keep us posted on how the work is coming.

 

[Grantorinslo]

I don't doubt that the goal is to get 55 HP out of a top end kit, and although Gude is good, I doubt he can do it. BTW people, the "head package" this guy is talking about is port/polish/valve job/assemble/custom cam/intake mainfold/TB/ECU and sometimes injectors. A typical Gude kit is around 1800-2200, however due to the fact an SHO is the ONLY car with our motor, there will be a ridiculous core charge or the kit will be more than double/triple that figure - where is he gonna get the ECUs and Intakes other than cores? Gude has been around and is well known for their Focus/Neon kits, the Focus kit is almost 60HP and costs 2gs. Other than the 4cyl scene I've never really heard anything about them. Calling a gude kit a 'built head' is a really bad mistatement, I would guess if they do make something it will be a partial kit or one of those "I'll send you my manifold now"/"I'll send you my manifold later +$150000000"

 

[SeanMc]

If I read right your new to the community, welcome aboard.

Yamaha did design a great engine that flows great stock. The flow numbers for the stock heads are on the board somewhere unless they were lost during the great crash of 2008. If you can't find them I'll try to find my flow numbers that I've got somewhere. I haven't heard what shosource has for numbers on thier stuff.

Are you going N/A or F/I? Make sure that if you do get this work done that he flows the heads with the runners and butterflies attached.

The cams that Shonutperformance and Shosource sell will handle about anything you can throw at them, but you will have to have the bigger valves and heavier springs. The numbers he's talking about could be reached, but you have to have alot of other mods to go along with it.

There are alot of people here that will argue with me, but, I believe the more air you get in the better any engine will run. And you can get it to run on the street, but good luck on keeping tires on it.

I've got the least power, lowest reving, and slowest N/A motor in a sho car when I can keep #5 rod bearing in it.

Do it, and keep us posted on how the work is coming.

LOL. I saw you called the other night, I'll get back to you tonight.

 

[illSHOyou]

The SHO heads are good, but they are not perfect. You could very well get 55hp from the heads, but your going to shell out the cash and your going to spin the **** out of the motor.

The only way I could forsee getting 55hp is 3.2L destroked to 3.0L or maybe 3.1 Big Bore, and then alot of head work, bigger valves and +40 cams. Working rpm would probably be in the 6,500-8,500rpm range. The stock intake would have trouble with that working rpm unless radically modified.

 

[Grantorinslo]

and again I point out that the 55 hp would not come only from the heads, but the whole kit. But I digress, Gude will not make something for such a low volume car guaranteed.

 

[supra dave]

mister gude said if we can get a group buy to happen that he will do the work. i can see the disbelief that you all may have, but mind you these heads where designed about 20 years ago. im sure there are things that can be done to make the better than they are now. and 55hp just from the heads, well i dont think you even see that but putting on a nice set of afr 185 heads on a 5.0. but with cams and intake work and the other modifications mister gude will do, i think 55 is a reasonable number(tho i am no expert on this subject). as soon as i get a set of heads i am sending them off to him. ill will post under this thread with pics and what ever performance numbers i get.