[Willshire]

Originally Posted by John Milner

If you are running stock style 389 pistons, you'll probably want to check your piston to valve clearance since the valve reliefs on a 389 piston are designed for a different valve angle than your 62 heads will have. You'll also want to run pushrods for a 400. Other than those things to look out for, it should run fine and run on pump gas.

Thanks John.

Sealed power cast .030 pistons 4 valve reliefs (i think they are the 288P), 068 cam and 1.65 scorpion rockers. Custom measured pushrods on the 345's right now. would be around .470 lift with the 1.65 rockers.

[hurryinhoosier62]

Originally Posted by Willshire

Thanks John.

Sealed power cast .030 pistons 4 valve reliefs (i think they are the 288P), 068 cam and 1.65 scorpion rockers. Custom measured pushrods on the 345's right now. would be around .470 lift with the 1.65 rockers.

Plan on changing your intake manifold ( if memory serves me). I believe the #62 heads have the late bolt pattern. As far as the difference in the valve angles, do you know how far down in the hole your pistons are at TDC?

[Willshire]

Originally Posted by hurryinhoosier62

Plan on changing your intake manifold ( if memory serves me). I believe the #62 heads have the late bolt pattern. As far as the difference in the valve angles, do you know how far down in the hole your pistons are at TDC?

Stock deck height. I have a 65 tripower intake as well. I’d have to check the sealed power pistons 288p (silvolite 1516). 0.470 lift. Is valve interference often a problem on aftermarket stock 288p replacement pistons?


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[hurryinhoosier62]

Originally Posted by Willshire

Stock deck height. I have a 65 tripower intake as well. I’d have to check the sealed power pistons 288p (silvolite 1516). 0.470 lift. Is valve interference often a problem on aftermarket stock 288p replacement pistons?


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Sometimes there is when using later model heads to replace the earlier heads. If memory serves me the intake bolt pattern changed in 1968(?). As long as your engine hasn’t been “zero decked” or you are using a cam with hellish lift you should be OK. If in doubt, put a piece of modeling clay on a piston top. Install the head and valve train for that cylinder. Pull the engine through two complete rotations. Remove the head and installed valve train and measure the valve impressions in the clay. As long as you have .050 or more clearance you should be good. Good to see you posting again, Adam.