Ls2 402 w/ 799 heads
Thread Starter
Teching In
Joined: Nov 2016
Posts: 2
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Ls2 402 w/ 799 heads New to the forum, been lurking for a while now but looking at purchasing a new short block soon and interested in a 402. Previous motor was an stock ls1 with 799 heads that i recently blew up. Was wondering what your thoughts are on this combo would be. Im sure its not the best combo but trying to get by with it for now. Also if someones done it already what was the compression ratio? Thanks for yalls help
Randy
Randy
TEA has a Stage 3 package... picks up like 30cfm in the low and mid-lift regions. Uses the same 229cc port or so but the VJ is different (uses 2.08/1.60 valves).
I've thought about going that route on a 402/416 for a long while. With a 240 duration cam, the heads have done 550rwhp. With more duration... maybe another 20rwhp? Either way, I think it would still be down like 25rwhp to the TFS245s with the same cam at that level, but for the cost... it would be a good head.
I've thought about going that route on a 402/416 for a long while. With a 240 duration cam, the heads have done 550rwhp. With more duration... maybe another 20rwhp? Either way, I think it would still be down like 25rwhp to the TFS245s with the same cam at that level, but for the cost... it would be a good head.
Thread Starter
Teching In
Joined: Nov 2016
Posts: 2
Likes: 0
Thanks for the input its greatly appreciated. Should have mentioned it is going on an airboat spinning a max rpm 6000. But more realistic 5800. Not spinning real high rpms but spin constant rpm for a while. Last motor cruised 3-3500 on the water and 4000 or so on dry ground
Total Engine Airflow http://www.totalengineairflow.com/
They do great work! I am on my second set of heads from them.
They do great work! I am on my second set of heads from them.
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Lift Intake Exhaust
.100 73 52
.200 148 126
.300 219 182
.400 269 233
.500 311 260
.550 332 267
.600 346 270
.650 353 270
Take these with a grain of sand. But this is the flow chart on them. Compared to TFS 235s or TEA Stage 2s, you can see the VJ def helps up top. The midlift is restricted by the 243/799 intake port shape. So you end up with similar midlift numbers to a TFS 215 or TEA Stage 2 head but the higher lifts are much closer to TFS 235s. But being down 25-30cfm in the midlift means probably 25-30HP loss (if across the lift range). But since it's not (although still in the meat of the valve opening), you might only be down 10-15HP. And with more duration or more lift, you might get some of that back.
So with a higher lift hydraulic cam or a LLR, I think these would be capable heads. 2.08/1.60" valves... so good on a 408 or 416.
The problem is the 225 intake port isn't big enough to feed a 416 effectively at 7500. But for a street car, it's a good alternative. I was quoted to upgrade mine. And it was cheaper than a Stage 1. This would probably cost about the same as a Stage 2 if ordered outright. And that's cheaper than TFS 235s or whatever. If you have 799s or 243s, it's pretty damn cost effective.
I'd love to see someone run it. I keep thinking an EPS 244/256 114 cam, 12.0:1 CR, and the Stage 3s on a 416 with my FAST 102 and Kooks 1-7/8" headers would be a strong street car. 540/500 through locked A4?
.100 73 52
.200 148 126
.300 219 182
.400 269 233
.500 311 260
.550 332 267
.600 346 270
.650 353 270
Take these with a grain of sand. But this is the flow chart on them. Compared to TFS 235s or TEA Stage 2s, you can see the VJ def helps up top. The midlift is restricted by the 243/799 intake port shape. So you end up with similar midlift numbers to a TFS 215 or TEA Stage 2 head but the higher lifts are much closer to TFS 235s. But being down 25-30cfm in the midlift means probably 25-30HP loss (if across the lift range). But since it's not (although still in the meat of the valve opening), you might only be down 10-15HP. And with more duration or more lift, you might get some of that back.
So with a higher lift hydraulic cam or a LLR, I think these would be capable heads. 2.08/1.60" valves... so good on a 408 or 416.
The problem is the 225 intake port isn't big enough to feed a 416 effectively at 7500. But for a street car, it's a good alternative. I was quoted to upgrade mine. And it was cheaper than a Stage 1. This would probably cost about the same as a Stage 2 if ordered outright. And that's cheaper than TFS 235s or whatever. If you have 799s or 243s, it's pretty damn cost effective.
I'd love to see someone run it. I keep thinking an EPS 244/256 114 cam, 12.0:1 CR, and the Stage 3s on a 416 with my FAST 102 and Kooks 1-7/8" headers would be a strong street car. 540/500 through locked A4?
Last edited by JakeFusion; Dec 1, 2016 at 08:32 PM.
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