Dulcich 408 on dyno - offset heads

[SwedishViking]

Hey! I’m so glad you got your W5 stuff up and running! Very nice. I’d like to request a better picture of the cams spec card. Also, can you show the head work involved? I remember you posted up some shots a way back.

Havent got so many pics of the heads. Here you could se the plastic fantastic. Will see if i could get some pics of the cam card. The heads flow at best 313 at 700.
Only got 1,5 ratio rockers.

 

[rumblefish360]

You have gotten your ports very wide. Mine did t to so wide. Flow sheet by the head porters friends flow bench on a 4.125 bore plate. I have a ways to go on this project… still!

 

[pittsburghracer]

Those heads would still be on my porting table only flowing [email protected].

 

[rumblefish360]

Those heads would still be on my porting table only flowing [email protected].

Ya want to have at them?

 

[pittsburghracer]

Ya want to have at them?

no Sir. I’m trying to get healthier so I can dig into some work over here

 

[rumblefish360]

I was just gonna say, send me the bill when your done… but OK…

 

[SwedishViking]

You have gotten your ports very wide. Mine did t to so wide. Flow sheet by the head porters friends flow bench on a 4.125 bore plate. I have a ways to go on this project… still!
Very close to mine
View attachment 1715835721 View attachment 1715835722 View attachment 1715835723 View attachment 1715835724

 

[gzig5]

You have gotten your ports very wide. Mine did t to so wide.

Looks to me like his ports are raised and shortened almost a 1/4” or so vertically and widened nearly that much. Should give a straighter shot to the valve with similar cross section as original?

 

[rumblefish360]

Looks to me like his ports are raised and shortened almost a 1/4” or so vertically and widened nearly that much. Should give a straighter shot to the valve with similar cross section as original?

I agree and probably.

 

[justinp61]

Havent got so many pics of the heads. Here you could se the plastic fantastic. Will see if i could get some pics of the cam card. The heads flow at best 313 at 700.
Only got 1,5 ratio rockers.

View attachment 1715835715

Looks similar to my Indy heads, size and shape anyways.

 

[rumblefish360]

Taller Short Side radius I’d imagine?

 

[Andrew vanman87]

He was supposed to dyno the 408 again today any numbers ?

 

[turbodart68]

I’m

So what’s the hp limit on the stock 340/360 blocks?

I have made over 1200 at the tire on a stock 70 340 block at 8800 rpm.

 

[rumblefish360]

And a clue on how that was done is within your screen name.

 

[LO23M8B]

I have made over 1200 at the tire on a stock 70 340 block at 8800 rpm.

That’s great. Man your tune must be spot on! Thanks for the info.

 

[Rat Bastid]

And a clue on how that was done is within your screen name.

Yep. Big difference making 1k with a hair dryer and doing it NA.

 

[pittsburghracer]

Yep. Big difference making 1k with a hair dryer and doing it NA.

And with a test n tuner or one raced. I know a lot of test n tuners that will only hit certain track on the best of days.

 

[turbodart68]

Yep. Big difference making 1k with a hair dryer and doing it NA.

Not really. Torque is torque. Its real easy to detonate a turbo motor. Detonation is what kills blocks, well and brutal torque. The wives tales about what blocks break at are false. I made 800 on nitrous with a cast crank 360 and it lived for years that way.

That’s great. Man your tune must be spot on! Thanks for the info.

My tune was really a mess for a long time. But the things I am super careful with are timing and fuel. Some people think I am too conservative but its what makes stuff live and I cant afford to throw money away because of impatience.

 

[K.O. SWINGER]

Not really. Torque is torque. Its real easy to detonate a turbo motor. Detonation is what kills blocks, well and brutal torque. The wives tales about what blocks break at are false. I made 800 on nitrous with a cast crank 360 and it lived for years that way.




My tune was really a mess for a long time. But the things I am super careful with are timing and fuel. Some people think I am too conservative but its what makes stuff live and I cant afford to throw money away because of impatience.

Those are very impressive numbers! I couldn't agree more getting greedy for an extra 30 or 40 horses or whatever and ending up with a garage full of oily scrap iron it's just not worth it.