Camshafts almost done

[tpepmeie]

Originally Posted by Pete

Todd,Damn i totally forgot about that.
I could've told you how to do it without having to clearance/grind the head. Pete

I don't know how that is possible without resorting to a reduced base circle. There is only so much room in the head casting around the lifter bores. With >.500 lift, I had to remove a lot of material.

Todd

[Pete]

Originally Posted by tpepmeie

I don't know how that is possible without resorting to a reduced base circle. There is only so much room in the head casting around the lifter bores. With >.500 lift, I had to remove a lot of material.

Todd

Head doesn't know if cam has small base circle and probably doesn't care

Todd, Is there a reason you didn't go that route.

Works either way,just less work.

Take it to PM if need be.

Pete

[tpepmeie]

32 custom titanium retainers (CHE Precision) arrived today... now just waiting my plenum and TB to get finished. Might have the little 427 running by fall....

[Pete]

Looking Good,Todd

Get her done for 2011 BG.

Pete

[XfireZ51]

Todd,

Did you investigate beehive springs? Any chance you'll be giving us an indication of what this baby costs to duplicate?

[Polo-1]

just about double the standard cost of a 415. my guess
That one hot 427

[tpepmeie]

Originally Posted by XfireZ51

Todd,

Did you investigate beehive springs? Any chance you'll be giving us an indication of what this baby costs to duplicate?

No behives here. Using a single Eibach spring, the outer spring of a dual intended for Porsche 911. Difficult to find right combination of spring rate, frequency, and lift capacity. i went with the recommendation of the cam grinder. Spring force is less than OEM, yet good to 8800 rpm. not a chance I'll turn it that high.

Retainers were designed to yield the specified Intake spring height. Will use .040" shims under exhaust springs for a lower installed height. The exhaust actually needs a little more seat force.

[tpepmeie]

Originally Posted by Polo-1

just about double the standard cost of a 415. my guess
That one hot 427

I stopped adding it up about a year ago .... Could probably duplicate it for around $40k. Don't tell my wife.

This build cost more, simply because it absorbed a lot of design costs, and becuase of some of the ancillary parts and tools I had to buy. For example, started with a "bare" set of Dunn heads. Bare really means bare... had to put probably $1000 in small parts to complete them. i could have cannibalized the original motor, but didn't want to do that. Note to self... don't buy bare LT5 heads for a project like this.

[XfireZ51]

Originally Posted by tpepmeie

No behives here. Using a single Eibach spring, the outer spring of a dual intended for Porsche 911. Difficult to find right combination of spring rate, frequency, and lift capacity. i went with the recommendation of the cam grinder. Spring force is less than OEM, yet good to 8800 rpm. not a chance I'll turn it that high.

Retainers were designed to yield the specified Intake spring height. Will use .040" shims under exhaust springs for a lower installed height. The exhaust actually needs a little more seat force.

Great stuff Todd. Any chance you'll hve her done in time for the Corvette Challenge in Crown Pointe, Ind.?
That'll be in October at Rt. 41 Raceway.

[Topfuel]

Did you look into valve seat angles on our N/A motors we have found a lot of flow below .050" lift. Right when the valve comes off the seat basically it a a radius grind on the valve and seat.
I was looking into Valve springs for my turbo motor since the boost pushes against the surface area of the valve there by decreasing the effective spring pressure. I looked into behive and liked the natrual harmonic of the spring is very high. Just would have to have custom valve spring retainers made didn't want to go thru that. Isky has springs made for Fiat that will work and have a couple of sets not that it will do you anygood now. Also valve lift would be at coil bind before .5 lift. You can get Ti springs made that is what prostock and Top Alchol motors are now using you can lower spring pressure and use single spring to 10500 rpm. Lower pressure = less paracitic loss in the engine. The cams look fantastic. A lot of work! More flow can be acheaved on valve seat and the pocket area of the port that is where most head porters are now spending a lot of thier time. Again WOW on the cams. my .02 worth