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Forum: Hot Heads Tech Talk

Forums->Hot Heads Tech Talk->Re: lash cold , solids

jgrady
Re: lash cold , solids


> I am unsure if aluminum heads change lash ? should not given head studs are in great clamp tension firmly hold distance deck to rocker ?
> related , I saw old hot rod article about P and G , valve gapper , Billy Rasmussen running C/A won nats 5 years in a row with 270 hemi dodge / old ford . in 12 ‘s in late 50’s . one smart guy , homemade ram manifold .
> Anyway he swore by .018 cold , ( both !) and 1955 300 service bulletin called for .022 both . Then later 300 opened up exhaust to as much as .028 . As an engineer , the delta ( change) due to temp change in a given engine should be constant , repeatable, certainly within .001 , so hot settings are a joke from cam guys covering tail when hot ( imho) . some constant number added or subtracted should get you cold set .
> But exhaust stem gets hotter , one would expect if done right exhaust would be set looser a few thou ? maybe more — but not .006 ?
> personally , despite fanatics about this , it seems a few thou one way or another makes no difference to performance in .500 lift , but gap should align with cam designer’s take up ramp . Much more important ? new
> comp flat tappert cam , 392 , hot heads , what is cold gap ? comments ?
>
> 2) using LA block pump , oil shaft changes length , anyone know numbers?
> 3) Arp studs hit stock valve cover , ok if cut at bottom , but nut still taller ? was thinking space up cover ( anyone make that ?) but then plug tubes wrong . Thanks for any input , be safe, John
>
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on: Sun 03 of Jan, 2021 [16:59 UTC] reads: 93

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