RAMM
Well-Known Member
Just the mains to 9/32". Nothing other than that. J.Rob
New life for an old 340 (stock stroke)
- Thread starter RAMM
- Start date
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Just the mains to 9/32". Nothing other than that. J.Rob
RAMM
Well-Known Member
I've seen that discrepancy in Mopars many times. Crap factory machining. Pretty sure that's why the run so hard when all corrected. J.Rob
yellow rose
Overnight Sensation
Yep. From your numbers your block was .046 OVER the max deck height of the block.
I was told that Chrysler would only take enough off the casting to get a clean, flat surface. That's why some ran like dogs, and some ran like a striped *** ape. When you have a tall deck, a set of rods at the blue print minimum and maybe a set of Pistons that were short on CH and you'd get one with 9.25:1 instead of 10.5:1 with all the tolerance stack up.
I was told that Chrysler would only take enough off the casting to get a clean, flat surface. That's why some ran like dogs, and some ran like a striped *** ape. When you have a tall deck, a set of rods at the blue print minimum and maybe a set of Pistons that were short on CH and you'd get one with 9.25:1 instead of 10.5:1 with all the tolerance stack up.
moper
Well-Known Member
Yup.
RAMM
Well-Known Member
A little more head way. See what I did there? J.Rob
yellow rose
Overnight Sensation
67autocross
A new iron curtain drawn across the 49th parallel
yellow rose
Overnight Sensation
WTH??? Did I miss the joke? Damn internet humor.
Why does that exhaust valve look small as chit?
67autocross
A new iron curtain drawn across the 49th parallel
Canadian humour eh...
yellow rose
Overnight Sensation
RAMM
Well-Known Member
It's just a dummy valve acting as a plug so I don't Nick the seat. J.Rob
RAMM
Well-Known Member
I'm actually quite satisfied with the flow results. Does anybody care to venture a guess as to why? J.Rob
skrews
Well-Known Member
Didn't take long to do?
mderoy340
Well-Known Member
.3 197cfm lots of flow early
67autocross
A new iron curtain drawn across the 49th parallel
You haven’t ported them yet....
RAMM
Well-Known Member
Close.
It's how these heads normally stall like a m'fer @ .430-.450" lift. These hang on to an inch. It has nothing to do with the port or vj. J.Rob
skrews
Well-Known Member
Was blending the chamber what kept it from stalling? I've seen that a few times.
RAMM
Well-Known Member
Bingo! J.Rob
skrews
Well-Known Member
Aw **** what did I win?
I can send you a bent autographed push rod from a 318.
Just send me your address and it's yours.
RAMM
Well-Known Member
Milled the heads .040" decks and intake face. Checked volume 60ccs and rechecked flow after final S.S. touch ups. Flow is now a smooth sounding 250-251cfm @ .490" Beyond that flow drops into the 240's and plateaus. I think these will work nicely considering the cam and compression. Looks like 10.7 static is in the cards. J.Rob
250 cfm? That’s enough to make a nice street engine for sure.
mderoy340
Well-Known Member
Any updates? I love the stock stroke builds and interested on seeing what that 113 LSA cam does.
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