HI THERE, I am building aGen5 454 with Eagle 4.25 crank and H beam rods.10.25 comp.The cam is aComp solid roller 712 gross lift,duration at .050 is 266 intake ,273 exhaust 110 lobe sep.Hooker 2"pri. 3.5" collectors &full 3"exhaust.9"rear /3.90 gears in70 chevelle W/Turbo 400&3800 stall converter. The Question I have is What HEADS can I use? I was thinking about CANFIELD Alum 310cc,But they have .600 raised exhaust ports,will I have header install problems ? ANY SUGGESTIONS THANKS BILL

How heavy a car? That seems like an awfull lot of cam for anything with 390s and a 3800 convertor. I have never tried the raised ex port heads in a Chevelle but the 310 would be a great head if you tone down the cam some.

THIS IS GOING INTO A 70 CHEVELLE SS THAT WILL BE DRIVEN ON WEEKENDS AND DRAG RACED FOR FUN. THE CAR WEIGHS ABOUT 3600 LBS. AND HAS NO A.C.

I have a 482 cu in BBC with .722 solid roller and 4200 stall convertor. I have GM 074 casting aluminum heads that have been cnc ported. they are plenty of head without having to go to a raised port. for a street/strip machine I sure wouldn't reccomend the hassle of raised ports. lots of good heads to choose from and you won't notice any difference on the street.