#11
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Do you have any idea what caused the valve to fail?
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I HATE RUST! |
#12
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No clue. It's almost like it was defective or weak. I'm sure the solid roller and heavy valve springs weren't gentle on it though.
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1964 Malibu SS, now a LS1 and T56, Back halfed, rollbar, narrowed 9 inch, 4.11 gears and 31x16x15 Mickey SSR's on Weld wheels. |
#13
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Have you calculated spring pressure at max lift?
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I HATE RUST! |
#14
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I believe they are at 220# 570#.
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1964 Malibu SS, now a LS1 and T56, Back halfed, rollbar, narrowed 9 inch, 4.11 gears and 31x16x15 Mickey SSR's on Weld wheels. |
#15
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Sounds like you did your homework. Whos valves did you use?
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I HATE RUST! |
#16
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They are the Milodon megaflow stainless steel valves.
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1964 Malibu SS, now a LS1 and T56, Back halfed, rollbar, narrowed 9 inch, 4.11 gears and 31x16x15 Mickey SSR's on Weld wheels. |
#17
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Ouch! you said it! good thing you didnt try to restart it or have it at high rpms. My grandfathers old 427 dropped a valve and it ended up sending pieces back into the intake and left chunks on the other bank. It ended up needing a sleeve in one of the cylinders and a few pistons and a .030
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1970 Chevelle SS396 project with 454/M20 ps,pdb,U14 gauges, rear defroster 84 K5 Blazer 350/SM465 75 K5 Blazer 355/SM465/8 lugs |
#18
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Well I've got my wishlist all together. I'm keeping the motor all the same with the exception of the solid roller cam and valve springs. I'm going to be losing approx. 80hp with the cam swap, but I should still be over 500hp with the new hydraulic and be much more streetable.
Here's the specs of how it's going back together. 383 stroker / splayed 4 bolt caps 12.5:1 JE forged dome pistons full float Eagle H beam 4340 rods GM bowtie iron heads worked over with 2.05 int. 1.60 exh. Comp cams 12-214-4 Hydraulic cam 305 seat to seat duration .525 lift. 110LC Comp valve springs 1.6 roller rockers Super victor single plane intake Proform 750 double pump carb I'll update when I get it back in the car.
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1964 Malibu SS, now a LS1 and T56, Back halfed, rollbar, narrowed 9 inch, 4.11 gears and 31x16x15 Mickey SSR's on Weld wheels. |
#19
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Do you calculate hp or dyno?
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I HATE RUST! |
#20
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It was calculated with desktop dyno and comp cams camquest dyno. I also had to calculate my dynamic compression and pick a cam that would give me the best dcr for premium pump gas. This setup puts my dcr right around 8.39.
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1964 Malibu SS, now a LS1 and T56, Back halfed, rollbar, narrowed 9 inch, 4.11 gears and 31x16x15 Mickey SSR's on Weld wheels. |
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