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  #1  
Old Dec 24th, 08, 5:25 PM
mikenbebie@comcast.net mikenbebie@comcast.net is offline
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Question LS6 454 build AFR heads

I'm building a LS6 454 which only has 300 miles on it since it was brand new. The bottom end is a stock LS6 with the exception of LS7 boron steel rod bolts being added to the stock LS6 forged rods. There is a windage tray under the crank. The LS6 original cam has been removed & upgraded to a hyd. roller cam 232/236 @ .050 with a lift of 626/626 & has a 110 LSA which I got from UD Harold. The heads are AFR 305 with CNC combustion chambers & I will be running Crane 1.7 gold roller rockers with an AFR stud girdle. My carb is a new professionally built 850 double pumper. My intake is a Edelbrock air gap and I will be running a windage tray under it. I'm using a MSD 6AL with a MSD billet distributor. The tranny is a built turbo 400 with a 2500 to 2800 stall and the rearend is a Ford 9" 31 spline with 3.89 gears. This combination will be in a 2700lb vehicle run 95% on the street. DO ANY OF YOU HAVE RECOMMENDATIONS as to what I could do to make this build run any better or changes of components that would help gain more power? What kind of HP/TQ do you think I should get with this set up? I will have it dynoed once it is together and broke in.
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  #2  
Old Dec 24th, 08, 5:59 PM
BLOWNBBC BLOWNBBC is offline
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Default Re: LS6 454 build AFR heads

I'm thinking that should make around 575hp and 600+ torque. Sounds like a great combo.
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  #3  
Old Dec 24th, 08, 6:17 PM
69-CHVL 69-CHVL is online now
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Vinny Vince
 
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Default Re: LS6 454 build AFR heads

What do you have that weighs 2700 lbs? What's the compression work out to?
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  #4  
Old Dec 24th, 08, 7:27 PM
wildman926 wildman926 is offline
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Default Re: LS6 454 build AFR heads

Probably a shoebox Nova. My father-in-law's weighs 2800. It is a 66 Nova SS.
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  #5  
Old Dec 24th, 08, 7:47 PM
mikenbebie@comcast.net mikenbebie@comcast.net is offline
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Default Re: LS6 454 build AFR heads

69-CHVL You asked what I have that weighs 2700 lbs? I'm putting this combination I am building with the LS6 in a 1930 Model A roadster. I will be running 29" Hoosie Pro Street radials on the back end laying 12 1/2" inches of rubber on the ground. Hopefully this 454 will turn them over. Anyway it should be fun to drive or so I hope. If this is not enough performance wise, I have located a Rodak BBC with a 871 blower which has dual dominators on top that is supposed to put out 1300 hp that I will up grade to!
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Old Dec 24th, 08, 9:00 PM
DOUG G DOUG G is offline
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Default Re: LS6 454 build AFR heads

Quote:
Originally Posted by mikenbebie@comcast.net View Post
69-CHVL You asked what I have that weighs 2700 lbs? I'm putting this combination I am building with the LS6 in a 1930 Model A roadster. I will be running 29" Hoosie Pro Street radials on the back end laying 12 1/2" inches of rubber on the ground. Hopefully this 454 will turn them over. Anyway it should be fun to drive or so I hope. If this is not enough performance wise, I have located a Rodak BBC with a 871 blower which has dual dominators on top that is supposed to put out 1300 hp that I will up grade to!

All I can say is give a listen...

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  #7  
Old Dec 25th, 08, 7:06 AM
mikenbebie@comcast.net mikenbebie@comcast.net is offline
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Default Re: LS6 454 build AFR heads

Quote:
Originally Posted by 69-CHVL View Post
What do you have that weighs 2700 lbs? What's the compression work out to?
69-CHVL do you know what kind of HP & TQ your 454 puts out with your 305 AFR heads? Are you running a 4 spd or an automatic? If you are indeed running an automatic trans. how much of a stall converter are you running? Also at what RPM does your 454 come alive? I'm curious as to IF there is much low end torque with the AFR 305 heads? I can hardly wait to get mine together, run it, and finally get it on a dyno!
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Old Dec 25th, 08, 7:26 AM
Black67 Black67 is offline
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Default Re: LS6 454 build AFR heads

Mike

I have been running a very similar set to your motor in my 67 Chevelle. Mine differs in that I still have the factory iron heads that were worked over and the L88 solid Flat Tappet cam. I also have the GM intake and a worked over 750 DP on it. I have a TB400 with a 3500 stall converter in it.

This car runs good, and it has lifted the front end off the ground before. With a light car like that, you should have no trouble turning those tires over. This setup should move that car really good.

If it was me, I would get this setup running and tuned properly first. Feel it out, and see how much power that it has. In that light of a car, you might not want more at the current time. Being able to drive the car on the street is the big thing. My set sometimes can be tricky on the street, especially when a bit damp.

Bill
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  #9  
Old Dec 25th, 08, 7:44 AM
mikenbebie@comcast.net mikenbebie@comcast.net is offline
Mike
 
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Default Re: LS6 454 build AFR heads

Quote:
Originally Posted by Black67 View Post
Mike

I have been running a very similar set to your motor in my 67 Chevelle. Mine differs in that I still have the factory iron heads that were worked over and the L88 solid Flat Tappet cam. I also have the GM intake and a worked over 750 DP on it. I have a TB400 with a 3500 stall converter in it.

This car runs good, and it has lifted the front end off the ground before. With a light car like that, you should have no trouble turning those tires over. This setup should move that car really good.

If it was me, I would get this setup running and tuned properly first. Feel it out, and see how much power that it has. In that light of a car, you might not want more at the current time. Being able to drive the car on the street is the big thing. My set sometimes can be tricky on the street, especially when a bit damp.

Bill
Black67, my 30 roadster is a show quality vehicle and it WILL NEVER see moisture or rain on the pavement. It's strictly a fair weather ride when there are NO clouds in the sky. If my dad was still alive he would remind me, "That a fool and his money are soon parted!" Thank goodness he has not seen the receipts and costs to build this roadster. This has been a 2 1/2 year build...or a black hole in the wallet!
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  #10  
Old Dec 25th, 08, 8:07 AM
69-CHVL 69-CHVL is online now
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Vinny Vince
 
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Default Re: LS6 454 build AFR heads

Quote:
Originally Posted by mikenbebie@comcast.net View Post
69-CHVL do you know what kind of HP & TQ your 454 puts out with your 305 AFR heads? Are you running a 4 spd or an automatic? If you are indeed running an automatic trans. how much of a stall converter are you running? Also at what RPM does your 454 come alive? I'm curious as to IF there is much low end torque with the AFR 305 heads? I can hardly wait to get mine together, run it, and finally get it on a dyno!

Mike, probably in the 550hp/550tq range. 5spd manual. Dosent really come alive anywhere, just has strong power from 1500 rpm through 6100-6200, very smooth power curve. I have monster low-end, but the 3.90's are helping too.

My best advise I can give you is ditch the hyd roller cam and get something solid in there if you wanna run it hard. The hyd gives up power everywhere, even down low.
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  #11  
Old Dec 25th, 08, 8:51 AM
GRN69CHV GRN69CHV is offline
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Default Re: LS6 454 build AFR heads

Mike, I run similar in a full size Chevelle - so figure I have a good 1000# more to drag around. A that weight (even if it's 3000#) you could go a little bigger on the cam. Biggest issue we have ran into with hyd rollers is RPM vs spring pressure. In order to spin them, you need more spring, which seems to reduce cam timing due to bleed down / compresssion in the lifter. You actually end up running more cam timing. At 232/236, it will be rather timid, but I would guess pretty quick in that light car. I ran 11.67/117.43 with a 454.030 ,233/236 .600/.610 112LSA hyd roller, ZZ502 heads, 3000 stall converter and 3.73 gears with a 28" tall tire. At 3000# or less, I would think that Model A will be low 11's - as long as it will hook.
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