Right. More head flow is always a good thing, provided you don't screw up the port velocity to the point where low speed operation is adversely affected. The nice thing about a blower is that you don't need huge port volumes to get big hp. But the general principles still apply and if you want even more power you will need better heads.

Rich Krause

 

See, I can be taught.

 

What are the pros/cons with Brian going with bigger AFR heads?

 

Pro... They work really well when they are cleaned up. Also, you can order different sized chambers to help get the compression down.

Con... They ain't cheap.

 

That's about the size if it!

Rich Krause

 

Hey B - I'll likely have 2 sets of stockers available. The first will be straight off my car when we yank the motor, and the second set is ready to go with all new hardware, but were NOT ported (don't ask!) due to a miscommunication it seems. I won't be using either set. Should be available in the next month or so...

 

Thanks Rich! I'm willing to give that a shot...what do the two numbers above refer too? The part number? I looked at a few sites, but couldn't readily find either one.

Right, I meant with stock heads to start with. I was afraid that if I didn't know the correct compression ratio with stock heads, I'd lower it way too much with bigger heads. I'm definitely wanting to buy the AFR's, just not sure which one to get at this point.

 

Good eye for the details Fred! I put that in intentionally to see what kind of feedback I'd get. I tried several times, but couldn't get the builder to even consider taking my money to do the 4-bolt conversion, he's adamant that it's unnecessary. So I guess we'll see...

 

Thanks, I definitely wish you better luck! Best advice I can offer is, DON'T deal with family and friends no matter how much savings you're promised! In this particular industry you need to be able to chew some a** once in awhile, and that's not easy to do with family/friends. In my case, the parts were paid for the first 2 weeks of the project...the rest of the time was one BS excuse after another. DON'T deal with family and friends! My advice to you is babysit the project EVERY step of the way and don't hesistate to yank all your stuff back and go elsewhere at the first sign of trouble! DON'T deal with family and friends! I don't know on the final cost yet, but figure to spend around 6K if you're doing the install yourself, others can probably give you a better idea.

And remember, DON'T deal with family and friends!

 

Thanks Brian let me know.

-B

 

Without know the exact specs of your motor to calculate the actual compression ratio, you can use the numbers listed to get you close. If you have stock heads ~58cc = ~9.2:1. Should be good for around 12# on pump gas. Probably around 500rwhp with unported heads, closer to 600 with a set of well ported stockers.

If you don't have the big $ for AFR's, you should be able to pick up a set of ported stockers for around $1000-1500 or so that will get you closer to your goals.

If you got the $, you can get the AFR's in any size you want from 76cc to 54cc.

 

I dont think you're going to get that 600rwhp for too long with the 2 bolt main. I mean you NEED 4 bolt mains if you want that power and any kind of longevity. And better yet, if you get the splayed 4 bolt, they are probably going to get billet caps, and thats even better than a stock 4 bolt.