Cylinder Head recommendation for TT
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From: Sierra Vista, AZ
Cylinder Head recommendation for TT Ok, made contact with a shop for a custom TT setup, need some info on cyl heads. I am thinking the larger valve is more a ticket than the porting for a FI head, is this right? How much if any really might I notice from say a AS stage 3 head ( or would a smaller stage be good) compared to the upcoming AFR 205's? I know they arent out yet, but numerically speaking, would there be that much a difference?
For the shortblock looking at having Machine Works knock that one out, with a forged bottom at 8 or 8.5:1 CR. The trans is finished, until the power rips it apart, then will have to call Cmotor back for an upgrade! Rear will also need to find another place to reside as I am sure the stock will not like as much TT boost as I plan on running.
Basically, need the heads figured out. Any help is appreciated. BTW, I have a set of ported stock heads, with 2.02/1.60 but dont think they will handle the level at which I want to be, any input without flow numbers??
Charlie
For the shortblock looking at having Machine Works knock that one out, with a forged bottom at 8 or 8.5:1 CR. The trans is finished, until the power rips it apart, then will have to call Cmotor back for an upgrade! Rear will also need to find another place to reside as I am sure the stock will not like as much TT boost as I plan on running.
Basically, need the heads figured out. Any help is appreciated. BTW, I have a set of ported stock heads, with 2.02/1.60 but dont think they will handle the level at which I want to be, any input without flow numbers??
Charlie
Port work should be tailored for the boost not just an off the shelf "stageX head". Most everything about it is different. You are correct in assuming less is more, good valves, decent flow....you want more power turn up the boost. The only benifit theAFR heads will have over a properly ported LS* head is the base thickness will help from lifting the heads under high boost. Give me a call I can help set you up with the goals you are looking for.
Nate
Nate
Nate has been great an always ansewers the phone it seems....says it will be there..and it is.
Onto the heads, i went with max port, max valve size..cause after all, were pushing big amounts of air. It probably wasnt necessary unless its a "go for it" situation. I like the deck thickness of the AFR's but gave up on them..well see what happens.
I would think large valves would help, but watch the chamber size...I have 74cc chambers on the way and it still took a -26cc dish on my 409 to reach 8.5 to one. Dish is not something you necessary want, so smaller chamber (i.e. LS! heads) would require an even bigger one...piston thickness + strength to turn up boost too...
sounds like your on a good path..just have 20k laying around to help you through it.
Onto the heads, i went with max port, max valve size..cause after all, were pushing big amounts of air. It probably wasnt necessary unless its a "go for it" situation. I like the deck thickness of the AFR's but gave up on them..well see what happens.
I would think large valves would help, but watch the chamber size...I have 74cc chambers on the way and it still took a -26cc dish on my 409 to reach 8.5 to one. Dish is not something you necessary want, so smaller chamber (i.e. LS! heads) would require an even bigger one...piston thickness + strength to turn up boost too...
sounds like your on a good path..just have 20k laying around to help you through it.
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From: Sierra Vista, AZ
I am getting the bottom built, or bought actually, and the heads hopefully will compliment the setup. As far amount of boost, lets say enough to spin the rears with around 800+rwhp at the track. But only around 650+ street. I am grasping the relationship of heads to FI, but am not totally there yet.
FI forces (hence the "F") the air in, larger valve more quick filling cylinder, and emptying. Smaller port more rapid (velocity = cleaner, more efficient burn) filling, chamber, smaller higher compression, not necessarily a good thing, depending on P2V relationship (which I dont have a lot of with my current cam). And finally deck thickness, yep AFR seems to be banking on that, and if they dont blow off, then they will make bank. Am I missing anything, it seems so hard to figure out.
FI forces (hence the "F") the air in, larger valve more quick filling cylinder, and emptying. Smaller port more rapid (velocity = cleaner, more efficient burn) filling, chamber, smaller higher compression, not necessarily a good thing, depending on P2V relationship (which I dont have a lot of with my current cam). And finally deck thickness, yep AFR seems to be banking on that, and if they dont blow off, then they will make bank. Am I missing anything, it seems so hard to figure out.
