Ls2 or ls3 top end???
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Teching In
Joined: Feb 2009
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Ls2 or ls3 top end??? I'm doing a ls2 build with a four inch stroke. I was going to put the ls3 heads and intake on but I think that's going to hurt my wallet too much. But I also think a set of cnc ls2 and going to be big money. I don't know what to go with
John
John
If you look at just flow numbers the ls3 stuff looks very good, and they are. But if you are street driving it's still hard to beat the cathedral port heads. The smaller intake port volume can make for some very good port speed and can make the car just snappy when you roll into the throttle. For good numbers on a budget, some ported 243's by the big names are hard to beat. AI, WCCH, TEA, etc.
I'm in the same boat myself.
I read where guys say that the rectangular port stuff is the cat's pajamas. Others rave about the under the curve power that the cathedral port stuff puts out. I read something recently where someone said that the people who recommend the cathedral port heads are either selling them or have no experience with rectangular port heads. That statement does hold some water in my eyes...
I read where guys say that the rectangular port stuff is the cat's pajamas. Others rave about the under the curve power that the cathedral port stuff puts out. I read something recently where someone said that the people who recommend the cathedral port heads are either selling them or have no experience with rectangular port heads. That statement does hold some water in my eyes...
I'm in the same boat myself.
I read where guys say that the rectangular port stuff is the cat's pajamas. Others rave about the under the curve power that the cathedral port stuff puts out. I read something recently where someone said that the people who recommend the cathedral port heads are either selling them or have no experience with rectangular port heads. That statement does hold some water in my eyes...
I read where guys say that the rectangular port stuff is the cat's pajamas. Others rave about the under the curve power that the cathedral port stuff puts out. I read something recently where someone said that the people who recommend the cathedral port heads are either selling them or have no experience with rectangular port heads. That statement does hold some water in my eyes...
2 heads. One that flows 350cfm at 650 with 275cc intake port size. 2nd one that flows 330 at 650 with 225-230cc intake port size. 2nd head will probably flow about 10 or more cfm's more then head 1 from 100-400.
Most ppl looking at those will probably look just at the top end flow and pick head one. The racers will most likely pick head 2 because with the average numbers it would actually be faster.
Now these numbers make some assumptions and it's really up to the way you want to run your setup. It's also not like it's a win or lose decision, it's more of a good vs good. Just more along the lines of what would work better for your setup.
Thread Starter
Teching In
Joined: Feb 2009
Posts: 48
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k1 4.000" crank and k1 stroker rods with arp 2000 bolts. pistons are going to be wiseco's either -2.8cc or -8cc...another decision i have to make. Ive read that the ls3 top likes alot of timing so I would need to keep the compression down. I can get ls3 bare castings for like 200 a piece and through stainless valves in em with a set of springs, retainers, and locks and mill them then get a stock ls3 intake. If I went with the ls2 heads I would probably have to get a nice FAST intake and TB and i think the price of that would be more then the ls3 set up.
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I have not run boost before so I'm not as sure on it. I know that boost makes heads not as big of a deal. With boost you will want a thick deck, TFS, AFR, All-pro, etc. The TFS 220 seems to be a good somewhat inexpensive choice for heads on boost.
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Verdad Gallardo k1 4.000" crank and k1 stroker rods with arp 2000 bolts. pistons are going to be wiseco's either -2.8cc or -8cc...another decision i have to make. Ive read that the ls3 top likes alot of timing so I would need to keep the compression down. I can get ls3 bare castings for like 200 a piece and through stainless valves in em with a set of springs, retainers, and locks and mill them then get a stock ls3 intake. If I went with the ls2 heads I would probably have to get a nice FAST intake and TB and i think the price of that would be more then the ls3 set up.
