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Indy CNC 300 heads

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DragRacingSpirit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DragRacingSpirit Quote  Post ReplyReply Direct Link To This Post Posted: Oct/19/2020 at 12:44pm
That being said, I have SR heads on my car and they work well but they are at their limit of what can be done with them. On this motor 4.250X3.9 I could use some more intake volume.

We moved the pushrods, run T&D offset rockers, and set the intake port volume at 260 cc.

No use trying to go any bigger than that as you can't support any bigger port with the valve limitation on those heads.

Peak intake flow at .750 lift 345ish
Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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tsanchez View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tsanchez Quote  Post ReplyReply Direct Link To This Post Posted: Oct/24/2020 at 4:44pm
Originally posted by DragRacingSpirit DragRacingSpirit wrote:

Bolt them to a block, roll it upside down and check it out visually at differing points of valve lift.


I have, but im at 4.375 bore so not really what you need , although I can try them on my old 4.210 block

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