Valve?
10-17-2011, 08:55 AM
#7
The stock LT4 valves are really nice, I would just keep them.
I find it absolutely hilarious that you want to put such a big valve in with such a big head and then a mild hydraulic cam.
A friend took second in SBNA at Dragweek this year is a touch over 400ci turns to 8500 with something like a .750lift solid roller and a 2.08 valve is all he runs in his 23 degree Dart heads. But you think it is a good idea for a 6500rpm little LT motor. I strongly suggest you begin researching what actually works instead of building the ultimate bench racer.
https://ls1tech.com/forums/5933110-post33.html
Even one of the guys going fast NA on LT4s says they are not the right choice for under 7000rpms even on solid roller strokers and that is not even getting into hogging them out to fit a 2.08 valve in them which would only make it worse for small displacement low rpm use.
Judging from your earlier reply you wont learn anything from this. You will cop an attitude.
The start of that post by Ed is a reply to me pointing out a car that runs faster than his, with lowly LT1 heads with tiny 2.00/1.56 valves, less compression.
I find it absolutely hilarious that you want to put such a big valve in with such a big head and then a mild hydraulic cam.
A friend took second in SBNA at Dragweek this year is a touch over 400ci turns to 8500 with something like a .750lift solid roller and a 2.08 valve is all he runs in his 23 degree Dart heads. But you think it is a good idea for a 6500rpm little LT motor. I strongly suggest you begin researching what actually works instead of building the ultimate bench racer.
https://ls1tech.com/forums/5933110-post33.html
Even one of the guys going fast NA on LT4s says they are not the right choice for under 7000rpms even on solid roller strokers and that is not even getting into hogging them out to fit a 2.08 valve in them which would only make it worse for small displacement low rpm use.
Judging from your earlier reply you wont learn anything from this. You will cop an attitude.
The start of that post by Ed is a reply to me pointing out a car that runs faster than his, with lowly LT1 heads with tiny 2.00/1.56 valves, less compression.
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10-17-2011, 09:06 AM
#8
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I don't believe you'll get them in the head if they are in stock location----if you do--they will be severely shrouded by the chamber wall and cylinder wall(if they clear)
On heads with bigger valves you will find that the intakes are moved toward the center of the chamber and the exhaust valve is moved even further over to give the intake room in between them
then there is the issue of your piston's notches aren't big enough for 2.080 valve and if they were they probably aren't in the right location
On heads with bigger valves you will find that the intakes are moved toward the center of the chamber and the exhaust valve is moved even further over to give the intake room in between them
then there is the issue of your piston's notches aren't big enough for 2.080 valve and if they were they probably aren't in the right location
10-17-2011, 09:27 AM
#9
I don't believe you'll get them in the head if they are in stock location----if you do--they will be severely shrouded by the chamber wall and cylinder wall(if they clear)
On heads with bigger valves you will find that the intakes are moved toward the center of the chamber and the exhaust valve is moved even further over to give the intake room in between them
then there is the issue of your piston's notches aren't big enough for 2.080 valve and if they were they probably aren't in the right location
On heads with bigger valves you will find that the intakes are moved toward the center of the chamber and the exhaust valve is moved even further over to give the intake room in between them
then there is the issue of your piston's notches aren't big enough for 2.080 valve and if they were they probably aren't in the right location
10-17-2011, 09:32 AM
#10
I ran into this same issue with my offset AFRs. Large valves, offset from standard location to prevent shrouding. Great idea, but with a long duration aggressive cam you run into problems with standard style pistons. Even though my SRPs have nice big 5cc valve notches, they are not quite in the right place and the exhaust valve hits the piston. Luckily my machinist charges chump change to flycut pistons, but its a PITA to have to take everything apart again.
Mine is a healthy solid roller that will see 7500+ rpm - it would be a whole lot of trouble for zero to negative benefit on a baby cammed stock computer LT1. Especially considering that you are starting with LT4 heads, which already have nice light valves for most combinations.
10-17-2011, 10:26 AM
#11
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Well first off I don't give a **** what 96multicoloredshitboxaidicksuckershitbox thinks. The heads in question were already run on a engine with different pistons. That one is no longer with us. I get that the valves are bigger then needed but this is what I have. The heads don't look to be modified as far as valve location. The engine is .040 over with a factory style 6.1cc piston. I don't want to hear options of the setup. Just if it will work ? I need the car running and don't have the funds to buy new heads.
10-17-2011, 12:08 PM
#14
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i am tired of that ******* constantly being a ***** in any thread that doesn't have something to do with swinging off his nuts or his fantastic setup. its not directed to you.
...........lol
10-17-2011, 01:50 PM
#16
Attacking him for giving you sound advice you stuck yourself. Hell not only can a set of decent stock heads be bought ~$200 assembled , one pf these big time drag racers like the one you cussed out probably would have gave you a stock cast head or heads for free or even traded to help you out.
A poor attitude leads to poor results, but an ******* usually just gets burned at the stake. Remember that!!
10-17-2011, 03:10 PM
#18
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i am not a newb here fyi. just cause i don't have a high post count here doesn't mean anything. and its not my first go round with 96. i posted more on camaroz28.com and butted heads with him but i have been unable to get on a computer or worry about cars for quite some time. i didn't want an opinion about it. i don't need to explain why i was doing it anymore then i did cause it doesn't have anything to do with the question. i don't go into others post and arrogantly talk **** about anyone elses setup. he doesn't need to add his condescending 2 cents about his almighty opinion. its got nothing to do with how an lt1 head is better then an lt4 head or the reason the heads don't have the stock valves. not everyone gets away with a tear down and being able to reuse everything. i am not asking anyone for a hand out nor am i about to take one. i just need technical advice and nothing more. if that is too much to ask then please by all means cruise right on to the next topic.
