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428 rebuild questions
I'm getting ready to rebuild my 428. My engine builder buds & I will be assembling it. (we race sprint cars & built our last motor ourselves & it's kicking butt) !! Anyway.... I need to know more about FE's & what they need.- Iron head oiling needs, porting, valve size, guide size, ect....I'm buying chrome moly shafts, end stands & Earson rockers.(1.76) Buy the way, the reason for the rebuild... the #1 & 2 cylinder head water passages were filled with some kind of putty or silicone, the #1 cylinder got too hot, freezing both valves shut temporarily,( the thin tight tollerance brass guides swelled I'm sure) the pushrod had no where to go & bent it 90 deg.'s in the manifold & broke the rocker shaft (no end stands). I talked to a few Pro. eng builders & they don't know why the coolant passages were filled. Sometime, the front cylinders run too cool but, the damage shows they werent getting enough plus, I think the guides were too tight. : Block prep- Long story but, it has .030 pistons now & may need to bore again. Their is rust pits & piston ring marks from the motor sitting for so many years. The last builder either did not bore enough or thought he could just hone them out, I'll just have to see what the machinest says. Any & all suggstions, advice & help will be appreciated guys !
Thanks, Kev |
tip
almost all Fords are dificient in exhaust valve size(except MR,HR 427)..not knowing what head u are going to run the suggestion here would be to run the largest exhaust valve that space will permit...If u are running a C80E-N head w/2.09-166 stock valves..take a MR exhaust valve 1.72 and ttry to fit that in . also use 70 degree reamer (after noting seat with dykum blue) to open throats up to the bottom of seat. also exhaust guides run much hotter than intakes, machining these too close will guarantee valve stem seizing with resulting bent pushrods.
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The best thing you can do for the bottom end is to open the main oil passages to match the bearings. If you look at the main saddles after the teardown you will see that ( except for the center one) the main oil passages are offset a little from the oil hole in the bearing. It is an easy and worthwhile mod to use a die grinder and open them. If you do it before cleaning there is usually an oil stain showing where it needs opened to.
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