looking for 461 BBC cylinder head opinions
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looking for 461 BBC cylinder head opinions
I have a 12 to 1 comp. 461 BBC (LS7) with iron GM 990 heads, professionally ported but no welding or filling has been done. Operating range will be 5500-7300. Current cam is a mild solid roller 6.88/692 and 269/276 @ .050 I'd like to use an aluminum head, and will also change the cam, but will probably limit lift to about .750 so for long valvetrain life. Heads I'm considering right now are AFR 315 CNC, BMF 310, and Pro-Filer 320, But I'm open to any and all comments and advice. I have a max budget of about $3500 for heads, so don't get too exotic.
Thanks, Scott
Thanks, Scott
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Re: looking for 461 BBC cylinder head opinions
My vote is for the 315 AFR heads with the CNC'd combustion chamber.bigblockwagon wrote:I have a 12 to 1 comp. 461 BBC (LS7) with iron GM 990 heads, professionally ported but no welding or filling has been done. Operating range will be 5500-7300. Current cam is a mild solid roller 6.88/692 and 269/276 @ .050 I'd like to use an aluminum head, and will also change the cam, but will probably limit lift to about .750 so for long valvetrain life. Heads I'm considering right now are AFR 315 CNC, BMF 310, and Pro-Filer 320, But I'm open to any and all comments and advice. I have a max budget of about $3500 for heads, so don't get too exotic.
Thanks, Scott
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These are both great heads & I think you could throw a blanket over the performance difference here
Personally I would look at what each costs & go from there
If I had to choose my vote would go to the AFR simply because I have seen how versatile this head is & the customer service is second to none.
Personally I would look at what each costs & go from there
If I had to choose my vote would go to the AFR simply because I have seen how versatile this head is & the customer service is second to none.
Mike
Lewis Racing Engines
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Lewis Racing Engines
4axis CNC block machining
A few of the cars I have driven & owned
A tour of my shop
The Dyno
And a few pics of the gang
"Life is tough. Life is even tougher if you're stupid"
John Wayne
I ran the BMF 310 on my 461 bbc with 13 to 1 compression and the same .050" duration cam. IN my 3400 lb Malibu, it ran a best of 9.43 @ 141 with a 1.289 60' footbraking. In the heat it would run 9.70's or so at 138.
Probably the best head in that size. I used a Vic jr intake with a 1000HP 4150 Holley.
Cam was a Bullet
269/276 @ .050
300/310 gross
.738/.710 lift
110 lsa, 108 icl
Probably the best head in that size. I used a Vic jr intake with a 1000HP 4150 Holley.
Cam was a Bullet
269/276 @ .050
300/310 gross
.738/.710 lift
110 lsa, 108 icl
Last edited by DOTracer on Sun Oct 26, 2008 9:48 pm, edited 1 time in total.
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That's one good running Malibu!! Probably the most compelling vote for the BMF so far.DOTracer wrote:I ran the BMF 310 on my 461 bbc with 13 to 1 compression and the same .050" duration cam. IN my 3400 lb Malibu, it ran a best of 9.43 @ 141 with a 1.289 60' footbraking. In the heat it would run 9.70's or so at 138.
Probably the best head in that size. I used a Vic jr intake with a 1000HP 4150 Holley.
Cam was a Bullet
269/276 @ .050
300/310 gross
.738/.710 lift
110 lsa, 108 icl
Scott
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Hi Mike,Wolfplace wrote:These are both great heads & I think you could throw a blanket over the performance difference here
Personally I would look at what each costs & go from there
If I had to choose my vote would go to the AFR simply because I have seen how versatile this head is & the customer service is second to none.
I would have to argue with the performance. Just compare them.
Smaller runner 310BMF to a 315AFR
more over all flow
AFR / BMF
249 / 259 .300
312 / 325 .400
353 / 374 .500
380 / 386 .600
386 / 393 .700
BMF flowed with 4.310 bore
AFR Flowed with 4.600 bore
Look at how many mid to low 8sec 10.5 cars run them. Yes they cost more but look at what you get.
3V Performance
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" ENGINES WITH AN ATTITUDE "
980-222-7230