Question about my heads when changing bottom end
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Question about my heads when changing bottom end I'm looking to change out my forged 347 out for a 402 or 416.
My question
If i decide to step up to a 416 can someone like Total Engine Airflow take my 215's and open them up to say a 225 or 235?
If not i will likely go with a 402, i am looking to only change the block and keep my top-end the same.
I have a 102 intake/tb, vindicator cam, 1 7/8 headers and so on. Just looking for better torque and as close to 550 wrhp as i can get.
My question
If i decide to step up to a 416 can someone like Total Engine Airflow take my 215's and open them up to say a 225 or 235?
If not i will likely go with a 402, i am looking to only change the block and keep my top-end the same.
I have a 102 intake/tb, vindicator cam, 1 7/8 headers and so on. Just looking for better torque and as close to 550 wrhp as i can get.
Last edited by My6speedZ; Mar 6, 2011 at 06:32 PM.
Have the heads been ported already? If so then they might not be able to port them any more. Thus the port volume is where it's at. The 215 is the port volume in cc's. The larger the # the more volume. If the heads aren't ported then porting them will give you a larger volume. How much more ??. depends on how much excess material can be removed. What block do you have? A 416 usually calls for a 4.065 bore x 4.00 stroke. A stock LS block won't get you there with out being sleeved. A 402 is a.30 over iron block.
A 402 is a.30 over iron block.
What you are describing is a 408, which is a .030 over the stock bore size.
fixed!
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By the calculator, 4.000" bore x4.00" stroke still rounds to 402ci as well....and 4.005" bore rounds to 403ci...my apologies.
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Last edited by Sales2@Texas-speed; Mar 9, 2011 at 11:54 AM.
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Have the heads been ported already? If so then they might not be able to port them any more. Thus the port volume is where it's at. The 215 is the port volume in cc's. The larger the # the more volume. If the heads aren't ported then porting them will give you a larger volume. How much more ??. depends on how much excess material can be removed. What block do you have? A 416 usually calls for a 4.065 bore x 4.00 stroke. A stock LS block won't get you there with out being sleeved. A 402 is a.30 over iron block.
Im assuming i could have the heads ported.
The heads are trick flows, doesn't all trick flow heads start from the same casting? I could them have them enlarged and just change the valve sizing correct?
Also I swapping short blocks, not going sleeved.
Was kind of wondering something similar in relation to my 414 plans, I was considering swapping over the AFR 205's on my 346 right now. I was thinking similar to you in having the ports opened more and larger valves installed.
Does the CC on 346 head need to be re-machined for a 4" bore?
Does the CC on 346 head need to be re-machined for a 4" bore?
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My thinking (in theory) is that if they are from the same original casting. AFR or anyone for that matter should be able to cnc them.
Just waiting to hear back about the TFS 235 and 215 using the same castings. I know i can go 225. That will be the deciding factor between a 402 and 416.
Just waiting to hear back about the TFS 235 and 215 using the same castings. I know i can go 225. That will be the deciding factor between a 402 and 416.