Afr heads with PAC 8002 spring upgrade.
01-22-2017, 09:46 PM
#63
Registered
01-22-2017, 09:49 PM
#65
Gold Member
Gold MemberThread Starter
Join Date: Oct 2005
Location: Olmsted Falls,Ohio Marblehead,Oh
Posts: 11,638
Likes: 0
Received 209 Likes
on
133 Posts
As far as. My building, engines sent 65 hours issue free, clearly built just fine, came apart because of parts wear, not building issues.
01-22-2017, 09:57 PM
#67
Registered
What did Smitty (ArticFriends) have ? 315's maybe ? He went 1100hp pump gas w/ Procharger.
Last edited by SB; 01-22-2017 at 10:05 PM.
01-22-2017, 10:06 PM
#68
01-22-2017, 10:08 PM
#69
Registered
Wow, I remembered correctly. Can't remember family member's birthdays but I can remember what someone bought for heads many years ago. LOL.
Smitty (ArticFriends) does have 315's.
Smitty (ArticFriends) does have 315's.
I switched from out of the box merlin vr heads with a slightly improved valve job and better springs to afr cnc 315's. I made 150 plus hp more with the afr's that I did with the merlins. I also did some small improvements at same time (ideal optimized custom ground hydraulic roller from rm builder).The thing you and everyone else need to keep in mind is a blower motor forces the intake charge into the cylinder. A mediocre intake port can have air forced into it like a good flowing cyl head port but the exhaust port is still just exhausting gas in the same manner as a n/a motor plus very little scavenging help from the water cooled exhaust. Thats where a cylinder head with killer exhaust ports and as least restrictive exhaust as possible will give you the best hp.Afr wanted me to run their 357 cc intake port heads when I called them and asked when building my procharged 540 but their own cyl head flow data said the opposite. On AFR'S (and most other aftermarket heads) they use the same exact exhaust port with different flowing intake ports. I chose the 315's against their advice because I wanted good idle and midrange plus unless you jump up to a big solid roller you would never see the 700 plus lift it took to have any gain from the higher flow the heads had on intake side. The exhaust numbers were the same between most their heads and blower is going to force the air thru the intake port anyways. It worked out real well for me,Smitty
01-22-2017, 10:09 PM
#70
Registered
Yes. They actually made 1036hp at 6500rpm. 522ci , afr 315 heads, 1071 littlefields with blower shop intercoolers , twin 1050 carbs, 10lbs boost. Mike Tkach built them, bob M supplied the cam and heads.
I just wrote the 3d timing map for the daytona sensors boxes and helped out for the dyno session. It was an impressive combination of parts. I believe with 8lbs boost, they made 930ish, and around 870 with 6lbs . Air intake temps were around 115 degrees with 6, 8 and 10lbs. The intercooler was doing its job.
The cam was 245/253 , 681/663 113 LSA if i recall .
I just wrote the 3d timing map for the daytona sensors boxes and helped out for the dyno session. It was an impressive combination of parts. I believe with 8lbs boost, they made 930ish, and around 870 with 6lbs . Air intake temps were around 115 degrees with 6, 8 and 10lbs. The intercooler was doing its job.
The cam was 245/253 , 681/663 113 LSA if i recall .
