how to choose heads?
06-26-2011, 08:06 PM
#5
i need a cathedral port head.....id say 2000 max for heads.....fast 102 in the future, plan on running the vindicator from vengeance...is it possible to have too big of valves? lets say for a 600 hp motor, how big of valves are needed?
06-26-2011, 10:20 PM
#7
grr omg everyone always asks even though thats not the question lol. just answer my effin question....jk....its goona be a 418, and lets just say the only stock parts that will be used are my valve covers, and coil packs.
Last edited by Floorman279; 06-27-2011 at 09:47 PM.
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06-27-2011, 07:41 PM
#10
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I am out of this conversation then. Bad attitude when looking for advice never works. All we asked were questions which pertained to your original inquiry.
Good luck.
06-27-2011, 10:16 PM
#13
and besides, the thread was asking how to choose the right heads,not help me choose the right heads....however input is always appreciated. its just im one of the rare ones who uses the searchfeature for the most poart, and all 200 of my posts were about asking questions, not just posting.....ive read what is needed to make good numbers, but i still am unsure on "HOW TO CHOOSEHEADS!!!!!!!"
06-28-2011, 03:01 AM
#16
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BY Phil from ADVANCED INDUCTION:
Flow numbers are neither comparable, nor are they an indicator of potential performance. You cannot compare flow numbers from different test setups on the same brand flow bench, much less tests using different fixtures, test procedures, transducers, and entirely different flow bench brands as you are attempting to do in this instance.
Flow #'s/graphs are marketing data. That unfortunately keeps most people from asking pertinent questions (e.g. what is the actual performance gain, quality of machine work, consistency of performance potential, etc.). For quite awhile we did not post any for these reasons, but the endless "what do they flow" inquiries forced us to in an attempt to cut down correspondence.
Exhaust flow extensions/pipes are another enormous variable. A pipe added to the exhaust of our 243's typically gains 45-55cfm @ 28" H2O on our test setup.
In the end, none of this is really fruitful for the end user. Your engine is not an overgrown vacuum cleaner. The flow graph you buy will have no effect on the outcome of your project, but the machine work you are buying will.
Hope that helps more than it hurts. Thanks for your consideration!
-Phil
Flow #'s/graphs are marketing data. That unfortunately keeps most people from asking pertinent questions (e.g. what is the actual performance gain, quality of machine work, consistency of performance potential, etc.). For quite awhile we did not post any for these reasons, but the endless "what do they flow" inquiries forced us to in an attempt to cut down correspondence.
Exhaust flow extensions/pipes are another enormous variable. A pipe added to the exhaust of our 243's typically gains 45-55cfm @ 28" H2O on our test setup.
In the end, none of this is really fruitful for the end user. Your engine is not an overgrown vacuum cleaner. The flow graph you buy will have no effect on the outcome of your project, but the machine work you are buying will.
Hope that helps more than it hurts. Thanks for your consideration!
-Phil
06-28-2011, 10:08 AM
#17
Woops, just noticed this is internal not external...........look, im not tryin to be a dick here.....i no i wont get much help than........one person took it the wrong way and now im not gettin anyWhere, except for predators response.....thats wat im looking for........u dont really need to no my combo to give me an answer to my question is all im saying......again, im not asking for wat kind of heads should i buy, just some tips on buying them......thanks again predator
06-28-2011, 11:45 AM
#18
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1. Buying used from a reputable seller can often save you money, so keep an eye on the classifieds.
2. At this point, you're highly unlikely to build something that has never been done before, so look to people with similar combos to get a general idea of how a particular head performs.
3. Make a short list of candidates and find out everything you can about them.
4. Repeat steps 2 and 3 until you have a winner, or just buy a magic eightball and ask lots of yes or no questions.
2. At this point, you're highly unlikely to build something that has never been done before, so look to people with similar combos to get a general idea of how a particular head performs.
3. Make a short list of candidates and find out everything you can about them.
4. Repeat steps 2 and 3 until you have a winner, or just buy a magic eightball and ask lots of yes or no questions.
06-28-2011, 12:35 PM
#19
Ok cool........makes sense, but how does valve size play a part? like if running 450 hp on an ls2 go with a 2.100 exhaust and a.1.65 intake? like how do i no wat size valves i need? Id call tsp but dont wanna bother them.with questions when i dont have money in hand
06-28-2011, 01:41 PM
#20
Sarcasm + internet= FAIL...good question tough.
Think about it in steps
1. What are my goals?
a. What am I going to be using the car for?
b. How much hp and tq do I need?
c. If drag racing what et do I want to run?
2. What is a realistic budget for me? (Should be first question)
3. Find people that have setups that reach you goals and see what they are using.
4. What size motor do I want to run?
5. What cam and what kinda power curve do I want?
So many questions inside of the question.
Also bigger valves more flow
Think about it in steps
1. What are my goals?
a. What am I going to be using the car for?
b. How much hp and tq do I need?
c. If drag racing what et do I want to run?
2. What is a realistic budget for me? (Should be first question)
3. Find people that have setups that reach you goals and see what they are using.
4. What size motor do I want to run?
5. What cam and what kinda power curve do I want?
So many questions inside of the question.
Also bigger valves more flow