Thumper Heads

black94gt50 · Apr 24, 2005

ok guys i know this has been discussed before, because i searched the forums earlier today about these.The more i look at these heads the more i want them, I'm kinda wanting to see if ne of u guys that are using these heads have the same setup as me. I have a B-303 cam, 1.6 roller rockers, the usual exhaust mods o/r h , and flowtech warlock mufflers, adjustable pressure regulator,thats all powerwise ive also put guide plates and a 3/8 stud kit from comp cams so i could use adjustable RR's. Neways how much power would i be putting out with the thumper heads and a typhoon intake ?? From what ive learned on these heads researching them i should be around 260-280 at the wheels with that setup and a tune, and have a very very low 13 or high 12 second car with some suspension work and dr's or slicks.And i know some of u guys want to tell me just buy aluminum heads and go all out well im 17 and a senior in highschool i'm making 8 bucks a hour and college is right around the corner so the 1200+ aluminum heads will just have to wait for a couple years lol i'm not trying to be a prick, but im sorry i just dont have the money right now, plus i believe these heads will do for what i want.I really want to retain fairly good lower end power because this is a street car, and thats exactly the way im building it, for the street and strip on the weekends.I've been a couple times so far to the strip around here but i would really love to get these heads on before july, so i could have sometime to work with my new combo on the track, before school and everything got started up. Thanks for ne comments u guys have , Clayton

RIO5.0 · Apr 24, 2005

Me and a few others run em...I have the spring upgrade on mine ($90.00)...I run mid 13s and 262RWHP...I'm still trying to bang off a 12 sec pass with em....
I paid 500.00 from a dude who purchased em them had to move, never put on the motor...

Killercanary · Apr 24, 2005

Look into GT40P's, they are a much better head in the long run. Do some searches for GT40P and I think you'll be impressed at what you find.

black94gt50 · Apr 24, 2005

where at in the thirteens are u running. and i have a question about the gt-40 p's which type of header can u use with that head i've done some research on the gt-40 p but it just seems like a big hassle to me

Killercanary · Apr 24, 2005

There are specific "P" headers, or I believe most long tube headers work. Check with 95snoozer and a few others though to be sure. Trust me, after you do all the research you will see that GT40P's are THE way to go on a budget bar none.

RIO5.0 · Apr 24, 2005

With 18" wheels and a 1.9 60...I ran 13.6 @102. Some DRs or some Nitto's would do a world of good....
I dont really hammer it full tilt as I'm weary of the T5 and stock rearend with 18's on it...I could drive it harder for sure...

black94gt50 · Apr 24, 2005

what type of numbers are the average gt-40p users coming out with i know ive seen a few over 300 horses but not many at all maybe 3 or 4.Does neone know if there are ne shortie headers that u can use with the gt-40p i believe i read a post a while bakc that said bbk made a set?????

RIO5.0 · Apr 24, 2005

A set of prepped GT40s would very nicely...I asked Thumper about doing me up a set...If you got them for cheap money, which they are out there, there sweet for sure...The GT40s just really started coming around in the last year or so or I prolly would have gone that route..Their alot more common now.
I priced out having some GT40 bare, then sending them to Mike. By the time you got the good valves/springs and had the port work done, it was rather $$$$ and Alum would be a much better option...

Steeda90GT · Apr 25, 2005

I'd say stick with the thunpers if you're on a budget. GT40Ps are good too, but you will need to spend $$$ to prep them right....by the time you do that you will be near aluminum heads territory.

One suggestion, dont get the typhoon, get an eddy performer/street heat intake.

blksn955.o · Apr 25, 2005

He ported my gt40 (non-p's) and they look great. My all new combo is having some issues I am sorting out but I did run a 14.5 @98mph with 2 inj. not working properly (read at all). not bad for a 6cyl. IF you can get a deal on some gt40 heads I would get those ported. His work is very good and it all depends on what you want out of it and how you want to get it.

black94gt50 · Apr 25, 2005

thanks guys ill keep u updated on what route im gonna go im gonna start looking for cheap gt-40p's on ebay or something if ne one has them on here would u liek to sell them fairly cheap????

94GT40 · Apr 25, 2005

I seriously considered the Thumper heads too, but settled on the GT-40p heads from Tri-State cylinder head. They are brand new castings with a 5 angle valve job and 1.94/1.54 valves in them. I think they are like $450 +shipping. Less money and more hp. Of course you will probably want to get the headers for $219. [I bought the ceramic coated ones for $289.]

I think either heads would be a nice set-up for the street.

black94gt50 · Apr 26, 2005

do u have a link to tri state heads??? im interested if i can get a set that cheap ive already got good trick flow springs and valve retainers and seals

94gtslow · Apr 26, 2005

I like the p-heads, if I had the money I would go AFR like killercanary.

But for the price they are pretty good.

look at sig for my parts.

Also went to the track last weekend, first time on my new 275 40 17 bfg drag radilas. And pulled a 13.19 with a 1.94 60 ft

Hope to get into the 12's this weekend, just dont now how to launch on these new tires.

94GT40 · Apr 26, 2005

http://www.tristatecylinderhead.com

But they don't have them listed on the site you have to call Jim Daly, he's the owner, and talk to him. He sells the heads completely assembled, valves, springs, etc...

Killercanary · Apr 26, 2005

They (tri state) also advertise in the back of MM&FF... I saw there add today in the new issue.

RIO5.0 · Apr 26, 2005

94gtslow...Sweet...some great times....Nice combo you put together...Ya need not spend big money...

94gtslow · Apr 26, 2005

RIO5.0 said:
94gtslow...Sweet...some great times....Nice combo you put together...Ya need not spend big money...

Thanks alot

Hopefully I'll get my 12 second pass this friday, I just need to learn how to launch on these DR's.

You can go fast on these heads. Only thing is you have to get p-headers, which really is no big deal. For the money, they are pretty good heads. It just depends on what the goals are for the car.

13's with p-heads is easy, look at sig on street tires. I would think with good tires that anyone could get into the 12's with them, but I am not yet, so who knows.

Overall I am pretty pleased with them. The one thing I like is that I only have to run 87 octane with them, I dunno why, maybe its different for other people, and I made the most power with the timing at 10 degrees.

BlackVert · Apr 26, 2005

i have thumpers and i am happy with them. but i have no numbers because i don't go to the track and i have not yet gone to the dyno.

Thumper Heads

black94gt50

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RIO5.0

Killercanary

The car that set the bar.

black94gt50

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Killercanary

The car that set the bar.

RIO5.0

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blksn955.o

black94gt50

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94GT40

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black94gt50

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94gtslow

94GT40

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Killercanary

The car that set the bar.

RIO5.0

94gtslow

BlackVert

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