which valvetrain for turbo motor??
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Staging Lane
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Joined: Aug 2008
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From: Hometown, Illinois
which valvetrain for turbo motor?? Building a 408 iron block... Rotating assembly is done.... Dragonslayer crank, callies quality rods, ross custom race pistons for 9.5 to 1 compression, hardened main caps and arp main studs, slp ported ls6 oil pump, slp double roller timing chain..... Planning on running the vtc4 turbo cam with my setup and a pt94 percision on 20-25 psi.... My question is which rockers, pushrods, lifters ( solid or roller/ and hydrolic or not)....oh and the heads are 317's with a race port and pollish with stainless valves retainers and a .650 spring, and head studs..... Any advice would be great,,, as u can see money hasnt been muchof an issue yet but i dont just wanna look at a list of parts and just buy the most expensive because it the highest price.... I want something that will work great with my setup
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Staging Lane
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From: Hometown, Illinois
Thanks liljohn for ur great input....that has really gotten me further in the process of figuring out how to build the MOST expensive version of the motor...the vtc4 cam is actually a custom grind cam the they make specific to ur build... And as far as a stock head goes a friend of mine made well over 900 hp with the same heads on smaller cubes and a start up tune... So i figured that the $1600 i had into the heads after everything was a good investment, not a cheap way out....
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Staging Lane
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From: Hometown, Illinois
To the others with some actual input, fellas thank u both.... Anyways as far as o ring the block and or heads are concerned??? What is that and what is the cost to do it...can it be done with the 317s or is it an aftermarket deal only... Only reason i ask is because i havent heard of this before
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The vtc4 is not a custom cam. It's an off the shelf turbo cam from Virginia Speed. The cost of a custom cam is only like $25 more than that shelf cam. As far as the heads go, sure, they'll make power but there's no way they will take all that 94 can throw at them.
Teching In
Joined: Nov 2012
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From: Irvine, Ca
I do not know the specs on the VTC4 cam so I cannot give you a definite answer on that. If the valve-train parts are well thought out then there should be no problem doing so.
You would need to take the block to someone to have it o-ringed and then have a receiver groove cut in the head to accept the o-ring that is now in the block. Fireball took a 4 bolt LS2 engine with stock pinned mains to 1700hp and 7.98 in the 1/4 mile with a o-ring set-up and never pushed a drop of water.
If you want to use every bit of power that turbo has reliably, you will have to have it o-ringed.
You would need to take the block to someone to have it o-ringed and then have a receiver groove cut in the head to accept the o-ring that is now in the block. Fireball took a 4 bolt LS2 engine with stock pinned mains to 1700hp and 7.98 in the 1/4 mile with a o-ring set-up and never pushed a drop of water.
If you want to use every bit of power that turbo has reliably, you will have to have it o-ringed.
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The vtc4 is an off the shelf reverse split mid 240's camshaft...
I can tell you the stock casting do NOT have a good enough exhaust port to be cutting the durations short.
The vtc4, 408 cubes and a large frame 94 is not a good match...
Motor like that... i wouldnt be looking at a hydraulic roller cam anyway... go solid and be done.
I can tell you the stock casting do NOT have a good enough exhaust port to be cutting the durations short.
The vtc4, 408 cubes and a large frame 94 is not a good match...
Motor like that... i wouldnt be looking at a hydraulic roller cam anyway... go solid and be done.
