AllPro LS7 style heads?
Those are stout numbers. To let you know how they compare to the best small block heads on the earth, the Dart Little Chiefs, look at the out-of-the-box flow numbers on a SF1020 for the Dart's:
Lift Int Exh
.200 158 138
.300 235 186
.400 300 241
.500 352 266
.600 385 274
.700 401 278
.800 405 280
.900 410 282
1.000 415 282
The All Pros aren't far off and have a slightly smaller port (12 degree versus 11 degree though, so the cross-sectional area is going to be a little closer). Overall, I like the All Pros better than a stock LS7 casting if you're really going after power due to the added beef around critical areas. Also, these will be for 427ci+ 7500+RPM engines. With enough compression and a big enough solid roller, 850-900HP should be attainable.
Lift Int Exh
.200 158 138
.300 235 186
.400 300 241
.500 352 266
.600 385 274
.700 401 278
.800 405 280
.900 410 282
1.000 415 282
The All Pros aren't far off and have a slightly smaller port (12 degree versus 11 degree though, so the cross-sectional area is going to be a little closer). Overall, I like the All Pros better than a stock LS7 casting if you're really going after power due to the added beef around critical areas. Also, these will be for 427ci+ 7500+RPM engines. With enough compression and a big enough solid roller, 850-900HP should be attainable.
Originally Posted by Richard@WCCH
Thanks for clarifying Mustang. Yes, the bare heads have all the major machining done. They are sold with all seats and exhaust guides installed. The intake guides are supplied with the heads but are not installed unless requested. These heads are primarily designed for high lift, high rpm racing applications hence the softer flow at .500" and .600" lift. If needed, we can bring down the peak flow some and pump up the mid lift flow, but you can't have both. $2799 buys you two CNC ported heads ready for valves, springs retainers etc,.
Be careful choosing a particular head merely based on flow. With that said the intake and exhaust ports have nearly 20cfm more peak flow than a standard LS7 head which as we know has a very well designed and executed intake port. The All Pro's are a thick wall casting with at least 50% more material behind the head gasket surface. These heads have a lot more aluminum in virtually all critical areas. The LSW heads weigh just over 4lb more than a standard LS7.
All Pro has built a great reputation making durable high quality head castings for racing small block Chevys in the Sprint Car and drag racing circuts for a long time. I chose to work with their heads because I believe their products have a lot of racing inspired technology built into them. The LS7 head is a fantastic head for street driven cars and some that do light track work but there is a reason why the Chevy C5R Covette team doesn't run them. They wouldn't hold up to the rigors of racing. Simply put, the All Pro heads like the racing Chevy counterpart (the C5R head) are built to hold up under extreme pressure.
I wish it weren't so, but quality and durability aren't cheap.
Richard
Be careful choosing a particular head merely based on flow. With that said the intake and exhaust ports have nearly 20cfm more peak flow than a standard LS7 head which as we know has a very well designed and executed intake port. The All Pro's are a thick wall casting with at least 50% more material behind the head gasket surface. These heads have a lot more aluminum in virtually all critical areas. The LSW heads weigh just over 4lb more than a standard LS7.
All Pro has built a great reputation making durable high quality head castings for racing small block Chevys in the Sprint Car and drag racing circuts for a long time. I chose to work with their heads because I believe their products have a lot of racing inspired technology built into them. The LS7 head is a fantastic head for street driven cars and some that do light track work but there is a reason why the Chevy C5R Covette team doesn't run them. They wouldn't hold up to the rigors of racing. Simply put, the All Pro heads like the racing Chevy counterpart (the C5R head) are built to hold up under extreme pressure.
I wish it weren't so, but quality and durability aren't cheap.
Richard
When I spoke to Bob on the phone the other day, he said that these heads would be capable of the 6 bolt pattern, for the LSX and the warhawk blocks. After our call I thought about it and the patterns for these blocks are different. Would they be custom drilled for the customers needs? Thanks,
Keith
Originally Posted by Stang's Bane
Very well said Richard.
When I spoke to Bob on the phone the other day, he said that these heads would be capable of the 6 bolt pattern, for the LSX and the warhawk blocks. After our call I thought about it and the patterns for these blocks are different. Would they be custom drilled for the customers needs? Thanks,
Keith
When I spoke to Bob on the phone the other day, he said that these heads would be capable of the 6 bolt pattern, for the LSX and the warhawk blocks. After our call I thought about it and the patterns for these blocks are different. Would they be custom drilled for the customers needs? Thanks,
Keith
Richard
Here's a recent intake port we tested that will be going onto an engine with a hyd. roller cam running .690" lift.
Lift___.100"_.200"_.300"_.400"_.500"_.600"_.700"
280Int 75.2 162.0 241.0 299.8 343.4 368.5 375.3
Valve size is 2.180"
There is no port stall to .800" lift and beyond.
Richard
Lift___.100"_.200"_.300"_.400"_.500"_.600"_.700"
280Int 75.2 162.0 241.0 299.8 343.4 368.5 375.3
Valve size is 2.180"
There is no port stall to .800" lift and beyond.
Richard
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Launching!
Joined: Mar 2003
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From: Kuwait / USA
is there a cylinder head for the LS family that can produce this flow, at leat at .600
Lift Int Exh
.200 158 138
.300 235 186
.400 300 241
.500 352 266
.600 385 274
.700 401 278
.800 405 280
.900 410 282
1.000 415 282
Lift Int Exh
.200 158 138
.300 235 186
.400 300 241
.500 352 266
.600 385 274
.700 401 278
.800 405 280
.900 410 282
1.000 415 282
flow
Originally Posted by Solid346
is there a cylinder head for the LS family that can produce this flow, at leat at .600
Lift Int Exh
.200 158 138
.300 235 186
.400 300 241
.500 352 266
.600 385 274
.700 401 278
.800 405 280
.900 410 282
1.000 415 282
Lift Int Exh
.200 158 138
.300 235 186
.400 300 241
.500 352 266
.600 385 274
.700 401 278
.800 405 280
.900 410 282
1.000 415 282
our canted valve head is slightly higher than that.
they are at 402 intake and 240 without a pipe at .600 with a 2.200 intake valve
