mchdg86

Which ones for around 550 rwhp on a stock bottom end? I can get a set of 241s for free or pony up $150-$200 for the 317s. I have Texas Speed stage 2.5 5.3 heads milled down to 62cc chambers right now and would rather not run 11.0:1 compression with boost haha.

MVP'S ZO6

Get some AFR heads. Yeah they cost more but they're worth it.

Honestly when it's all said and done the price for an out of the box AFR head if you shop around isn't that far off from a extensively worked and assembled (with good parts) stock casting.

mchdg86

I plan on getting a set of AFR 230s at the same time as a forged 347 later down the line. But for now I was just going to get a set of stock casting heads with a set of dual springs and new seats and seals. I would love to go with the AFRs now but the $2000 more that it will take to get them will pay for the rest of my fuel system a DPP direct drive and an innovators west crank pulley haha.

robert miller

Can you have the pistons fly cut to lower the compression.Robert

mchdg86

I'm not sure how much the stock pistons can be fly cut but I don't think it would be enough to lower the compression very much. I would really like to be at least down to the stock 10.0 compression so I would need an awful big fly cut and I don't know if the stock pistons can be cut that much.

MVP'S ZO6

What heads are you running now? 62cc? If you can run a 66cc head you will be around 10.0 : 1 with a .051 gasket.

Just fly cutting won't effect your static compression ratio. Not enough to notice anyway.

mchdg86

I have TSP stage 2.5 5.3 heads milled to 62cc now. The stock 241 heads are 66cc. But the 317s are 72cc and flow the same as 243 heads. Thats where the conundrum is lol. Go back to stock heads or pay a couple hundred for a set of 317s with lower compression than stock and better head flow. Either set I get will get new valve springs seats and seals.

p1bz

Stock 241's are just fine. If your goal is 550, there is no need for aftermarket heads.

MVP'S ZO6

I take almost everything I said back with the 72Cc head you should be at 9.5 : 1. Which will be good. Don't go much lower then that though.

FixedRoof

For 550rwhp, either will work. The 317's will help out though. More timing, due to less compression.

Blitzkrieg

I am at about 675-700 with stock bottom and 241s with small blower cam!

There is no need to mess around with different heads to reach 550, 600 or even 650-700!

mchdg86

We only have crappy 91 at the pump here in OK would I be safe with the stock 10.0 to 1 compression with out meth?

MVP'S ZO6

No because even at 10 PSI boost and with that compression ratio your car is going to make 700 at the tires. Meth is cheap insurance. and especially with 91 and your static compression ratio, I'd use it. It will save your engine.

Blitzkrieg

91 octane gas + Boosted car without Meth = Hiroshima!!!!

I can't tell you what to do, but I would NEVER even think about it. Meth is a MUST for you guys that only have 91 gas, unless you are under 8-9lbs of boost! ! bad tank of gas and your motor is smoked!

If you are going to spend $5000 or more for a boosted setup, I don't understand why $500 for a meth system seems to brake the bank for some people to keep there motor together!

Here is a good example.........If you are in a car accident, would you be better off with a seatbelt on???? Think of meth in that way!

If you do not fully understand the need for meth or how it works, I recommend that you speak to Juilo at Alkey Control, Arun, Bret(BLOWNBLUEZ06) or any of the guys at ECS as they will lock you on as to the benefits of meth and how it works! Listen to these guys as they have been tuning and building fast cars for many years!

I run dual #10 nozzles

mchdg86

I don't think it will take more than 8 psi to get me to 550 rwhp. As the car sits right now it has 1-7/8 ARH long tubes with a catless x-pipe a 224/230 cam with the tsp 5.3 heads. I will swap the heads for a stock set of 317s with a dual valve spring kit. After reading more into meth I think I will go ahead and get an ECS kit and tune the car with out it and just have it for insurance.

How much do you guys think I will make with the afore mentioned combo with an A&A t-trim kit with a 3.8 blower pulley and an 8 inch crank pulley?

2003VETT

Stock 241's will work fine for 550. Easily. Been doing it for years.

Sinister-one

The man knows of what he speaks.....

mchdg86

I bought a set of 317s milled to 70cc. I have decided that I defanitly am going to get an ECS meth kit though for insurance.

helga203

What ever hp you get wont be enough. Welcome to the sickness.

mchdg86

Oh trust me I know lol. That's why I'm going past the si trim to a t trim or maybe even a ysi that way when I forge the bottom end all I have to do is get a smaller pulley haha.