245cc heads on 347
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and yes, with the 2.080 intake valve that is a concern, but I spoke with WCCH and they said since the heads im looking at are the smaller chamber version I "should" be fine... he wouldn't say with 100% certainty pretty much just to cover himself I think, but it sounded like it would be good to go, as far as clearance is concerned.
and if I do get these heads and the don't work on this 347 I could always put themon the 408 in my truck!!
and if I do get these heads and the don't work on this 347 I could always put themon the 408 in my truck!!
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The valves will be close. You could probably see the same results from a smaller port head with some 2.02 valves or so.
Lingenfelter's head on the LS1 was a 250cc port. They did ok.
AFR 225 Small Bore heads had 2.08" valves as well and they did ok too.
I think it's not ideal, but it'll fit and it'll work. If you spin to 7500+ it would work for you nicely.
AFR 225 Small Bore heads had 2.08" valves as well and they did ok too.
I think it's not ideal, but it'll fit and it'll work. If you spin to 7500+ it would work for you nicely.
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If so, I need to grab a pack of 6 super cold, and will be ready for a little entertainment!!!
Christian
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From: Birmingham, AL
Ed, Martin@Tick, or another guru here, teach us please. Help make sense of the valve shrouding, port velocity, and flow numbers. Being that an engine is an air pump in its simplest form, the more air you can flow through it, the more power it should make.
In theory. Help me clarify that statement and put it into reality.
Rectangle port heads have a different CSA.
CSA is what matters. Not port volume. That's why the Lingenfelter heads do well with their 250cc port and 2.08" valves on stock LS1s. Hell, their flow numbers are atrocious as well but they make power and torque.
CSA = cross-sectional area. You can make power and torque with a big port if it keeps velocity up.
CSA is what matters. Not port volume. That's why the Lingenfelter heads do well with their 250cc port and 2.08" valves on stock LS1s. Hell, their flow numbers are atrocious as well but they make power and torque.
CSA = cross-sectional area. You can make power and torque with a big port if it keeps velocity up.
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In a word Christian - no.
Remember the grief we both took from the "gurus" on here with your original LS6 combination? Blew up a lot of the internet folklore with your results so no, I won't be doing any explaining of anything on here. Besides, there is Speedtalk and YellowBullet for unfiltered information.
