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Post by PatM on Mar 18, 2005 15:54:59 GMT -5
What can I expect to gain in Hp going from a oval port 781 with some pocket porting to a 305 AFR rectangle port head that has CNC chambers an some pocket porting an flows 370cfm??
I would also like to know what to expect in ET an MPH gain. When I bought the heads they told me to expect to see around 4 to 5 MPH gain. That seems like a lot to me. The car ran 128 to 129 wit the oval ports. Thanks guys!! ;D ;D
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Post by Mike Stark on Mar 21, 2005 11:43:26 GMT -5
You will see a heck of a gain. Lot's of factors though. Weight, cam, compression, etc. I would think a 4 to 5 mph gain would be a cake walk.
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Post by PatM on Mar 22, 2005 12:37:05 GMT -5
Thanks Mike, The compression will probably go up about 3/4 of a point because I had the block decked an went with a .060 over bore from .030. Went from 12.5 TRWs to a 13-1 Lunati piston. The heads are a true 118cc all so not the factory guess of 119cc for the oval ports.
I will also loose around 60 to 70lbs off the front because of the heads being that much lighter. It ran 10.40s before with a best of 10.32. I would like to run consistant low 10s in the heat an maybe hit the 9s on a good day. Thanks again!!!
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Post by BrianB on Mar 24, 2005 22:30:00 GMT -5
Are you going to change your cam to take advantage of the increased airflow of the new heads?
Brian
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Post by PatM on Mar 28, 2005 12:09:37 GMT -5
Brian,
The cam I had was to big for what I had so I am hoping it will work fine with this combo. Its a .685x.692 an 269x276 on a 110LS. I would like to have around the .714 to .720 range but it still should work fine with the heads I have according to AFR.
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Post by 67RS502 on Mar 28, 2005 13:02:31 GMT -5
I'd say 5mph easy. How soon you gonna have it to the track, as I'd like to know how deep in the 9s youre gonna run...  Keep us posted |
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Post by Pat M on Mar 29, 2005 9:37:54 GMT -5
I really don't think its going to go into the 9s more like low 10s. I would "Like" to hit the 9s just to say I did but not counting on it.
When I rebuilt the motor I had a chance to go with a 496 an it would have probably put me in the 9s but I didn't want to have to up date to all the heavier fire suit an other things that go with it. Thanks guys!!!!
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