Challenge my thinking on intake manifold/head flow
01-07-2008, 09:44 PM
#1
Challenge my thinking on intake manifold/head flow
Ok, so I was thinking of having my 243's ported tonight but got to thinking. A chain is only as good as its weakest link. The 243's flow almost identically to the 317's. Here's the flow data from the heads.....
And here's the flow data from all the intake manifolds (just look at the truck one as it is a requirement).
So if the truck intake manifold only flows 234 cfm at .500 lift and the heads flow 250 cfm at .500 lift, what benefit (if any) is there to opening up the heads if a person is sticking with the truck intake manifold? If my thinking is wrong, please challenge me. I am about to sell my brand new 243's or turn them back into patriot for some cnc ported ones if you can prove to me that ported heads are better than stock on an engine with the truck intake.
And here's the flow data from all the intake manifolds (just look at the truck one as it is a requirement).
So if the truck intake manifold only flows 234 cfm at .500 lift and the heads flow 250 cfm at .500 lift, what benefit (if any) is there to opening up the heads if a person is sticking with the truck intake manifold? If my thinking is wrong, please challenge me. I am about to sell my brand new 243's or turn them back into patriot for some cnc ported ones if you can prove to me that ported heads are better than stock on an engine with the truck intake.
Last edited by hirdlej; 01-07-2008 at 10:00 PM.
01-07-2008, 09:48 PM
#2
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Ok, so I was thinking of having my 243's ported tonight but got to thinking. A chain is only as good as its weakest link. The 243's flow almost identically to the 317's. Here's the flow data from the heads.....
And here's the flow data from all the intake manifolds (just look at the truck one as it is a requirement).
So if the truck intake manifold only flows 234 cfm at .500 lift and the heads flow 277 cfm at .500 lift, what benefit (if any) is there to opening up the heads if a person is sticking with the truck intake manifold? If my thinking is wrong, please challenge me. I am about to sell my brand new 243's or turn them back into patriot for some cnc ported ones if you can prove to me that ported heads are better than stock on an engine with the truck intake.
And here's the flow data from all the intake manifolds (just look at the truck one as it is a requirement).
So if the truck intake manifold only flows 234 cfm at .500 lift and the heads flow 277 cfm at .500 lift, what benefit (if any) is there to opening up the heads if a person is sticking with the truck intake manifold? If my thinking is wrong, please challenge me. I am about to sell my brand new 243's or turn them back into patriot for some cnc ported ones if you can prove to me that ported heads are better than stock on an engine with the truck intake.
01-07-2008, 10:02 PM
#5
I am wanting to keep under the hood looking absolutely stock. Also don't have the money for aftermarket intake manifold and adaptor this and adaptor that. I am wanting to make this installation as effortless as possible. This truck is to be a sleeper.
01-07-2008, 10:21 PM
#7
The SSR Intake flows the same as the truck one, it just has a larger TB opening but I heard after the opening it cones down to a 78MM anyways.???? Correct me if I'm wrong. I'm just starting to get frusterated as I wanted this to be a $2K 6.0L swap on a budget and I'm up to $2K already and am starting to put the clamps down on the build.
$700 for LQ4
-300 for selling heads
+450 for new 243 heads from patriot.
-130 for selling coil packs
+600 for cam+pushrods+springs at thunder or similar vendow (all priced the same)
+250 for 8.1 injectors
+550 for headers and ORY
+50 headbolts
+80 for head gaskets
= $2250
$700 for LQ4
-300 for selling heads
+450 for new 243 heads from patriot.
-130 for selling coil packs
+600 for cam+pushrods+springs at thunder or similar vendow (all priced the same)
+250 for 8.1 injectors
+550 for headers and ORY
+50 headbolts
+80 for head gaskets
= $2250
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01-07-2008, 10:24 PM
#8
My whole objective is to make a 13 second RCSB truck for no more than 2 grand. With the mods above will I hit it? If you're telling me I can hit it with a TR220 and 243 heads and long tubes. I don't need anymore power then. But I didn't do this much work to get a 13.4 or higher truck. 13 flat or bust.
