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About this time last year I decided to replace the stock valve springs on my 400 with a set that better matches the cam. Well, plans change I guess and a year later the engine is still on the stand with much bigger things in store for it. I've decided to go with new heads, rockers, cam and...

I've been anxiously awaiting my new springs and retainers and I finally have them in-hand. All of the parts look great, I ended up going with the Crane springs that OldmanRick steered me to, and some Comp 10 degree retainers and locks. But of course there's a problem :banghead: The distance...

I'm in need of some help choosing my new valve springs. I can't seem to find anything that will fit a stock 452 big block head with stock valves. I'm OK with buying new locks and retainers that work for whichever springs I end up going with, but other than that they have to be compatible with...

Getting ready to change out my valve springs. I removed my rockers to inspect my current valve springs and I found that I could actually spin a few of them with my hand. I may be new at this, but that doesn't sound right to me... Anyhow, cam specs are 0.442" intake, 0.465" exhaust, 272/282...

I've been chasing a high RPM misfire for a while now and I'm pretty sure that it's being caused by tired old valve springs. Anyhow, I pulled apart the rocker assemblies and pushrods for inspection. The rockers and shafts look great but the pushrods were coated in sludge, I'm assuming from...

Just curious, would a low compression smog motor need more mechanical timing to maximize power? I know that 38* is the best baseline for most big block mopars, but what about on late model 400's or 440's that have about 8:1 compression? Seems to me that the flame front would travel slower...

Anyone have an idea of how much RPM a mostly stock '78 400 can handle? Everything is stock on the engine with the exception of a mild performance cam (.442int, .465exh, 214* int @.05, 224* exh @.05), some long tube headers, and an Edelbrock 650cfm carb. Not sure about the valve springs, but I...