Hello Im making a drag racing car with a 300ci engine, I have no doubts, but I am worried about Roller rockers, I Hade a race cam and I need 1.60 rockers. Do you know some good ans Strongs ones?

Thanks a lot.

 

Do you mind if I ask what relationship there is between developing 1000 hp and the strength of the rocker arms?

Jessel and Harland Sharp both make good products.

 

I have Triple (3) 100 kgs Springs, so I think i need good rockers? and 6500 rpm. Maybe I cant explain me well.

 

Welcome to the forum, juancho uy! The Frenchtown Flyer is a retired Ford engine development engineer who just happens to drag race with the Ford 300 engine. Pay close attention to him!

 

Thanks for your advice, I read about Him, and I respect all your words.

I will be in touch

 

Sorry, I response on another topic, or thread.

I think no relation between 1000hp and strenght of the rocker, I would said That I will be using Triple Springs with 100 kg of initial charge. The header man (who improve the head ) said that normal rockers will collapse, or head will be broke if Y dont put rockers together. and another thing is that I need more lubrication, because oil never will go up throw the original part, because we change pushrods, with bigger an with no lubrication.

Tanks for your help.
I sent pics of my head.

 

That is one the nicest prepared heads head I have ever seen. It looks like a work of art.
Do you know that spark plug adapters are available ($10 each) to convert from 18 mm to 14 mm plugs.

Some NASCAR engines use spray bars to cool and lube the top end with oil.

 

Thanks a lot, It was made In Argentina, Im from Uruguay.

This person make this adapters for me to put 10 mm sparks.

Look new pictures.

 

Do you remembre How many cfm have in intake and exaust?

 

I would rather not quote cfm flow figures. That is because I do not do my own flow work and I do not want to give up any information confidential to my flow man. don't worry too much about the exhaust - try to get the intake to flow as much as possible.

 

I'm using Comp Cams 1826-12

They use a 7/16" rocker stud

COMP Cams Ultra Pro Magnum XD Roller Rocker Arms 1826-12


Paul

 

Thanks, what kind of springls do you use?

 

Its OK, I understand. It is part of the secret..
One more question, I can´t figure what kind of cylinder head did you use in your drag? Can you tell me?

Thanks a lot

 

My cam is a hydraulic flat tappet for street/strip use.
It has .534" valve lift.
I used the Comp 990-974 spring.
Installed height is 1.635" which gave me 115 lbs on the seat and 310 lbs open.

Your valve springs will depend on your camshaft profile and the closed and open pressure is usually called out by the cam card that came with the cam

Did the cam supplier specify the spring specifications needed for your cam?

My head has 2.02" intake valves and 1.60" exhaust

The head flowed 212 cfm on the intake and 179 cfm on the exhaust both at .600" lift

 

The head on my blue altered roadster is an extremely rare experimental prototype that was tested at Ford. Ultimately they went with the V6 instead. It has more potential than the stock head but finding one is difficult since it was never put into production.
Here's some pics: