Homemade or Custom cut-off intake/port and polish job.

[MAXTORQ]

Question: Why did you apply paint on the inside of the head and plenum? I'd be leery of the paint flaking off from the multitude of heat cycles......

It was cleaned prior to the manifold being installed.

 

[RacinDuallie]

Here is the one I built, on my second one now.

I am really liking this piece. :evil

 

[cquestad]

Kipo...what head is that..CR, 24 or 12 valve?

I did not hit anything...but I did not go much more than 1/2" max back and tapered to round...

 

[MAXTORQ]

Thats a 24 valve head , does'nt matter if it a CR the same rule applys. You just don't want to take too much of that flat bottom out of the runner.

 

[cquestad]

you made me nervous...but it is too late.

I might have a steam powered turbo now...

 

[cquestad]

You went deeper than the base circle though...in that photo...

 

[joefarmer]

And still no dyno evidence that it is worth the time?

John Robinson found evidence with one of the setups he's tested. I don't know if it's public yet.

 

[ETH/DEE]

check out WHITEKNIGHT's avatar and the restriction is obvious.

 

[DTanklage]

i went pretty crazy on the pockets (to improve low lift numbers) but i dont think opening up the csa would make all that much diff

back cut both valves too...

whoopie!

 

[Rodram2002]

Dtanklage, Do you have some better pictures of the bowls? I'd like to compare how much you took out to what I did on mine. I just had my valve jo done and had the valve back cut. Just needs some new tappets for my cam and a weekend to throw the head and cam in.

 

[DTanklage]

got better than pix

got dim

int 1.600

ex 1.450

 

[Mike Holmen]

To bad no one builds/makes high flow stainless valves for 12v and 24v engine, with the cutback already done like the gaser have. I worry about cutting to much off and causing the valve to weaking/break during high rpm operation. How good is the metal quality of the valve?

 

[DTanklage]

thats not wheres valves break

i have never broke a valve under eight grand anyways

and these valves are either really good or its just that the motor dont turn no rpm but both high mileage heads i have had apart looked really good

you can get valves made to any specs - ur money

 

[AsTroSS]

To bad no one builds/makes high flow stainless valves for 12v and 24v engine, with the cutback already done like the gaser have. I worry about cutting to much off and causing the valve to weaking/break during high rpm operation. How good is the metal quality of the valve?

Stainless is not good for exhaust (high EGT)

Iconel is only way to go ..:kick:

 

[DTanklage]

Stainless is not good for exhaust (high EGT)

Iconel is only way to go ..

thats funny - been 4.30/175 mph with ss ex valves

6.60/205 in the quarter

lotsssssssss of nitrous

only thing wrong with stainless is that its heavy

but again, how many trucks you see spinnin 12,000 rpm?

i use trick valve train in n/a stuff that goes 14,200 but these guys running ti retainers in their street trucks are crazy if you ask me

and ti keepers even crazier

you got 60+ psi boost in a motor that dont see 5 grand - spend your hard earned money elsewhere

my .02

don

 

[oldsmokey97]

Dtanklage, Do you have some better pictures of the bowls? I'd like to compare how much you took out to what I did on mine. I just had my valve jo done and had the valve back cut. Just needs some new tappets for my cam and a weekend to throw the head and cam in.

I agree.... lets see more pics

Lance

 

[SPEEDSHIFT]

Bump for a good thread.

 

[kipo]

pics of #2 going on my cr head.

 

[oldsmokey97]

how are people sealing their intake plenums to the head after porting??

Im going to go with a o-ring style seal.

Anyone got pics?

Lance

 

[kipo]

gasket material, tapped out a gasket, and sealed with loctite 515. don't use the cheap yellow looking cork material but the dark grey colored seem to hold up a lot better.