Quote:
No, doesn't matter. The only reason the intake would be different for a 351 would be that the heads would be a little further apart. |
Quote:
Regarding our performance application, buying after market, should we? - buy 302 - buy 351 - arbitrary Why? |
Also, the difference between the 289/302 intake and the 351W intake is that the 351 is wider due to the block being taller.
Performer RPM 302 Performer RPM 351 |
Quote:
|
Quote:
|
Trans Axle and Tires
Ok we know our trans and it turns out the stock axle is 4.1. Assuming a 255/60x15 that gives us this, which is probably not enough top end. Maybe we need an even taller tire?
|
You should be able to spin that engine and make power to 6500 with the right heads. I would spin it up to 6000 before, but because of the heads, power would die off about 5500.
|
Quote:
This engine is equivalent to what I'm running in the Cobra with the exception of a root instead of a centrifugal. I'm running AFR 165 heads and a Crane 2040 and it pulls strong to 6000rpms. On a chassis dyno I put down 433rwhp with the supercharger belt slipping at 5300rpms. I would have put AFR 185 heads on originally but I still had the stock bottom end and the stock pistons won't clear the larger valves in them. I now have forged pistons that will clear the larger valves so an upgrade is in order one day. |
Quote:
"BTW, what about intake and carb, those seem important too. :nuts:" I though we were going blower? |
Quote:
Everyone has different ideas on what to use. Lets figure our cost factor and THEN we can pick our intake runner based on manufacture flow rates.:drink: Another thing to keep in mind is: An NA motor drags the air/fuel into the cylinder- a forced induction pushes the air/fuel in. Port velocity in small NA engines is VERY important. BUT, Forced Induction is pushed thru port and port size (to a limit) can be bigger than on a NA motor. |
Quote:
|
Quote:
Every once in a while I get things right.:nuts: |
Joe has the intake with the blower, but does not have a carb for it anymore. He suggested a Demon Holly 750. Anyone, anyone?
I will begin looking for a smoking deal on AFR 190s~ to get a feel for how much they will likely be. Or maybe just a pair of these, as BRUTAL originally suggested. http://www.tristatecylinderhead.com/...roducts_id=106 |
Quote:
AFR is the best for the cost. These are the heads I actually suggested. Now these are China heads. They will probably need some work- quality may be an issue ( I haven't seen these head myself)--but the price is right. I know some of you guys don't like china heads. :judge: http://www.tristatecylinderhead.com/...products_id=29 |
I just talked to Troy at Ford Performance in Anaheim. They're a speed shop in Anaheim that build motors of all types, but somewhat specialize in Ford. He helped me a bit during my Corvette build.
I talked to him about our build and he recommended off the shelf as cast Avenger Heads with 195 cc runners, Fully assembled including shaft mounted rockers: $859 for the pair. They were going for like $1199 and up recently, but the economy ain't so hot. They are brand new aluminum heads. He says he uses them on their crate NA 347 for 440HP. Plenty of head for our application. This seems like the way to go, the AFRs are just a bit much. Any thoughts? He had two questions. What are the pistons? Something about making sure they had the proper valve relief. He said as long as they were aftermarket pistons there should be no problem. Also, he wanted to know about the cam so he could set up the spring pressure properly. Keep looking or pull the trigger? This represents the upper end of my budget for heads. |
Quote:
Yep, most aftermarket heads are interchangeable now. You just have to purchase the correct head bolts/studs. |
Quote:
Again, I can't find any specs on the cam, but I would be very surprised if it had more than .540 lift on the exhaust side, and no more than ~230 - 240* of duration at .050 on the exhaust side. It would be less on the intake side. This was a pretty mild cam. |
Quote:
They are probably fine, your call. Like I said, we can make anything work here.:drink: Just need a good starting point. They will be better than any stock head I could port.:) Saturday after the run I could give a Porting 101 class. Someone just needs to bring a pad (big) and pen. |
Quote:
I couldn't find the 195cc version on their website, but I looked at the 185cc & 205cc. The 185 flowed 274 cfm on intake and 190 on exhaust @ .550 lift. The 205 flowed 290 cfm on intake and 223 on exhaust @ .550 lift. http://www.avengercylinderheads.com/SBF185.pdf http://www.avengercylinderheads.com/SBF205.pdf |
Quote:
We are going with 195 (I think). Here are the flow numbers for his CNC Ported 185: Lift:cfm-in:cfm-out .100:69:59 .200:129:118 .300:188:153 .400:234:178 .500:269:189 .600:278:195 .700:281:210 .800:288:228 For his CNC Ported 205 .100:71:61 .200:142:124 .300:190:162 .400:252:200 .500:287:218 .600:300:225 .700:305:230 .800:309:235 So, I sort of infer that our flow numbers for a 195 and .550 lift would be 284:207 How's dat? |
Quote:
.100 .200 .300 .400 .500 .600 65 133 192 238 271 292 51 114 173 210 231 236 |
I think those heads would work well and they're about $500 less than AFR.
|
Quote:
If the 195's as cast are simular to the 185 CNC then they will work fine. The mid lift is not as good as AFRs (no one is really) but this is a "GOOD" head. I'd still like to see a set. Without a flow bench a clean-up (if needed) is the best way to go. "In head porting, what you don't do is sometimes more important than what you do do". Brutal :judge: If I do Porting 101, you will know enough to understand what entailes a good head.:D:drink: |
Quote:
|
Quote:
|
Quote:
Is this going to be like the porting section in the How to Hot Rod a Big Block Chevy book? I learned a lot from that book when I ported my old oval ports. It actually gives info that's useful for all types of heads. |
Quote:
I'm going to go over basics and the big NO NOs. :D |
Quote:
|
Quote:
|
Quote:
|
Quote:
It won't be untill we get back from the cruise. Love to see you there.:drink: |
Quote:
|
Quote:
|
I won't be here at work tomarrow. So I won't be able to get on here. Sean, Ben call me if you have any questions.
I will need a good size pad and somehting to draw with. I'm assuming that people are interested. If they are not, no biggie.:drink: |
Quote:
|
Heads Purchased.
One thing, didn't include rockers like I thought, but still seems like a good, or at least fair deal over all. Q: What kind of cam does this engine have in it, I forgot? Q: Can/should we reuse the rockers from the stock heads? If so what was the stud size? OR, should I just bite the bullet and get a set of aluminum roller rockers for $159? We saved quite a bit of money on the original car and will save some more because Ron will be building the cage, so I thought it made sense to use the savings and splurge a bit on the heads within reason. Now I'm somewhat back in el cheapo mode. :smack: |
Quote:
Can you bring them (one)to the cruise?? I have a valve spring (very old) tool and we could pull a couple of valves.:drink: |
Quote:
BTW, what about the rockers yo? |
Quote:
I meant the New heads. Yes, we can use the old rockers. Bring a few with you. Let me see them just to be sure.:drink: |
Carb
Glenn, did you say you had a carb that could be used, or know where we could get one that would be appropriate on the cheap? I'm assuming we could get a used one, and somebody here could rebuild it and set it up for our purpose.
|
All times are GMT -7. The time now is 06:13 AM. |
Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.