I really need help on head choice for 402.
I really need help on head choice for 402. Here's the situation. I'm finalizing my shopping list for my LS2 402 stroker. But before I can order, I need to determine which head I'm gonna use so I can pick the appropriate piston. I currently have a set of Texas Speed race style LS6 heads. Here's the specs I have on them:
I'm also considering the AFR 225's. Here's the specs I've found on them:
Now, for me to sell my current heads, and buy a set of AFR 225's without the spring upgrade would cost me ~$1075. What I need help figuring out is whether it's worth it. Could I just pick a cam with more lift and make up for the smaller intake valve size? I'd hate to dump $1075, or $1375 to only gain 10rwhp. Or would I get significantly more? I could REALLY use some sound advice here so I don't waste a ton of money if I don't need to.
Thanks everyone
- 238cc Intake port volume
- 59cc combustion chambers
- Patriot Gold valvesprings good for .650" lift
- 2.055" Intake valves
- 1.600 Exhaust valves
- No flowbench numbers
I'm also considering the AFR 225's. Here's the specs I've found on them:
- 220cc Intake port volume
- 72cc combustion chambers
- .600" lift (.650" lift upgrade $300 extra)
- 2.080" Intake valves
- 1.600" Exhaust valves
- Advertised 320/250cfm @ .600" lift w/4.125" bore
Now, for me to sell my current heads, and buy a set of AFR 225's without the spring upgrade would cost me ~$1075. What I need help figuring out is whether it's worth it. Could I just pick a cam with more lift and make up for the smaller intake valve size? I'd hate to dump $1075, or $1375 to only gain 10rwhp. Or would I get significantly more? I could REALLY use some sound advice here so I don't waste a ton of money if I don't need to.
Thanks everyone
Last edited by V-10 Killer; Nov 5, 2005 at 09:46 PM.
Please, someone has to have some advice here.
I'm going to try to have my heads flowbenched here next week. Maybe that'll help make this decision easier. I just need to figure out whether to flowbench on a 3.905" (old engine, more straitforward comparison) or 4.000" bore (new engine, more apples to oranges comparison).
I'm going to try to have my heads flowbenched here next week. Maybe that'll help make this decision easier. I just need to figure out whether to flowbench on a 3.905" (old engine, more straitforward comparison) or 4.000" bore (new engine, more apples to oranges comparison).
On The Tree
Joined: Sep 2005
Posts: 105
Likes: 0
From: bayarea
Looking at what you have right now with your ls6 heads and a 59 cc and then going to the afr 225 with a 72 cc there looks to be a pretty big CR drop. Can you give me a little more specs about the motor and gaskgets used. what are you looking at for the CR?? I just drop a 402 into my car and used my old ls1 stage 2 heads with a 65 cc and my CR was about 10:1.1 I am now thinking about getting the Patriots stage 2 205.5 / 1.60 ( best bang for the buck) I have heard that AFR are some of the best heads but for the price witch is about double the cost of the patriot.
Good luck
Good luck
That's the biggest reason I'm trying to think about it now. Using my 59cc heads, I was told I'd need a -14cc dished piston with a .040" compressed height gasket, to hit 11.2:1. If I used the AFR 225's, I'd need a flat top piston to hit the same compression ratio. I only have 3 weeks left to figure it out before I place my order
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Originally Posted by V-10 Killer
Explain your reasoning please?
Nate
https://ls1tech.com/forums/showthrea...&highlight=ETP
http://forums.corvetteforum.com/show...post1552595485
www.ETheads.com
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go with the AFR, it sounds like thats the head you want and if you dont get it now, your gona regrette it later, and thats just additional cost. Do it right the first time or do it twive.
Originally Posted by Nate_Taufer
Becuase they are the best thing going on in the LSX market right now. I'd suggest a set of the 225's or 240's depending on cam choice.
Nate
https://ls1tech.com/forums/showthrea...&highlight=ETP
http://forums.corvetteforum.com/show...post1552595485
www.ETheads.com
Nate
https://ls1tech.com/forums/showthrea...&highlight=ETP
http://forums.corvetteforum.com/show...post1552595485
www.ETheads.com
This is not saying that ET heads are not a good head but how many other test's are out there?? And the test's you posted are not even of the same heads your pushing
Originally Posted by destroyerSS
So that is what you would go off. 2 dyno test's. I have AFR's but my car is waiting to be tuned so i cannot give you personal opinions but i would wait for a few more test before i would make a choice on $2400-2500 set of heads.
This is not saying that ET heads are not a good head but how many other test's are out there?? And the test's you posted are not even of the same heads your pushing
This is not saying that ET heads are not a good head but how many other test's are out there?? And the test's you posted are not even of the same heads your pushing
If you're biased because you bought AFR's then that's fine. I would be defending the product I bought. But I haven't bought heads yet because I've been waiting for these heads to come out.
Also I suggest you do a google search for ET performance and pull up some numbers on non Gen III motors. You will probably pull your foot out of your mouth.
Nate
If you read my post you would see that i'm not saying the AFR's are better or worse just that there needs to be more side by side test's before any judgement's are passed. But your the one saying buy this brand cause of 2 dyno sheet's. Also i'm curious if ET's heads will flow the same after about 100 pairs cause you never know if any little extra work was done to give BIG #'s and make a nice splash in a new market. NOT saying this is true but just wondering
I looked at ET Heads website for reference and they look nice. What sponsors sell them. I've never seen them or a price on them. Are they comparible in price to AFR's?
I wish I had more time to learn all about the importance of cross sectional area and everything but I don't. Looks like I'm gonna need a crash course on it.
I wish I had more time to learn all about the importance of cross sectional area and everything but I don't. Looks like I'm gonna need a crash course on it.
Originally Posted by destroyerSS
If you read my post you would see that i'm not saying the AFR's are better or worse just that there needs to be more side by side test's before any judgement's are passed. But your the one saying buy this brand cause of 2 dyno sheet's. Also i'm curious if ET's heads will flow the same after about 100 pairs cause you never know if any little extra work was done to give BIG #'s and make a nice splash in a new market. NOT saying this is true but just wondering
I can understand where you're coming from. I have seen quite a bit of performance stuff from ETP before they got into the Gen III market though so I know their reputation. They have a killer 18 degree head that a lot of guys run with great results on big bore mouse motors.
On The Tree
Joined: Sep 2005
Posts: 105
Likes: 0
From: bayarea
Originally Posted by V-10 Killer
That's the biggest reason I'm trying to think about it now. Using my 59cc heads, I was told I'd need a -14cc dished piston with a .040" compressed height gasket, to hit 11.2:1. If I used the AFR 225's, I'd need a flat top piston to hit the same compression ratio. I only have 3 weeks left to figure it out before I place my order
Well, pricing out from LS1speed.com, a set of ET 240 (advertised as 245) heads with the options I'd need/want, would cost a little over $3,000 plus shipping. AFR 225's will be a little over $2500 plus shipping (getting a good price thru someone else). I think considering what it costs to gain a few more N/A horsepower, I'll just settle for 480-490 rwhp and jet my dual stage NX kit a little higher. I can still think of better places for that extra $1,500-2,000. Thanks for the info though guys
Originally Posted by xxxhp
The prices at LS1speed.com could be outdated. Better check with ET Performance themselves
Natee