[SOLD] Mopar Performance crankshaft
- Thread starter NCmtnDWELLER
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Yes - Sir
I want be using it so time to put it up for Adoption !
Sure it would. Long as you don't get caught. lol
7e5hangten360
semi-pro
would work nicely with 73 340 pistons. piston would come 0.018 above the deck. sounds familiar ? same as 68-71 340. except for stroke, of course.
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72 Pistons are around .50 down in the bore =
would not the stroker crank put them .50 up?
If .200 stroker would it not be .100 higher and
.100 lower in bore?
would not the stroker crank put them .50 up?
If .200 stroker would it not be .100 higher and
.100 lower in bore?
7e5hangten360
semi-pro
your thinking is right. if you want to compare a 340 with this new stroke, first, you need to know that the 73 piston is exactly 0.100 in. lower than a 68-71 piston (1.740 vs 1.840 compression height) . a 68-71 has the pistons .018 in. above the deck. so a 73 is 1.840 minus 1.740 -.018 = .082 in the hole. using the 3.510 in. stroker crank vs 3.310, the piston is now half the stroke difference minus .082 (3.51-3.31 / 2 -.082) , you get 0.018in., which means the piston ends-up .018 above the deck surface, just like the high comp. 340 but now, it is stroked. it would be a pretty easy to build combo, if you can find pistons for a 73 340, which are not that common nowadays. a 360 piston could be used, although with less compression.
a 318 could very well use this stroke since the compression height is similar to the 73 340 piston. it would be an interesting combo, but the small piston diameter would lead to a 342-343 cid.
a 318 could very well use this stroke since the compression height is similar to the 73 340 piston. it would be an interesting combo, but the small piston diameter would lead to a 342-343 cid.
As my old fuzzy Mind remembers:
The specs that Mopar gave NHRA are
.45 Above (68 to 71) and .54 Below (72 to 73)
and that is what we have to live with in stock/superstock.
I rounded them out a few thousands for simplicity in explanation.
Of Course, when Larry Shepard submitted them to NHRA
he was optimistic on all the tolerances! The same with every
other spec that he submitted on the Mopar Engines (Cam/Heads/etc.).
GM and Ford were also optimistic as well for NHRA!
The specs that Mopar gave NHRA are
.45 Above (68 to 71) and .54 Below (72 to 73)
and that is what we have to live with in stock/superstock.
I rounded them out a few thousands for simplicity in explanation.
Of Course, when Larry Shepard submitted them to NHRA
he was optimistic on all the tolerances! The same with every
other spec that he submitted on the Mopar Engines (Cam/Heads/etc.).
GM and Ford were also optimistic as well for NHRA!
7e5hangten360
semi-pro
John,
those are the tolerated specs for use in nhra stock/superstock only, not to be exceeded to pass tech.
the numbers i use are what these engines had from the factory.
the difference in height between 68-71 and 72,73 is still right around 0.100 in. ( 0.045 plus 0.054 in.)
those are the tolerated specs for use in nhra stock/superstock only, not to be exceeded to pass tech.
the numbers i use are what these engines had from the factory.
the difference in height between 68-71 and 72,73 is still right around 0.100 in. ( 0.045 plus 0.054 in.)
7e5hangten360
semi-pro
this is a for-sale ad.
why dont we give the seller good notes and leave the conversations where they belong, in some other discussion forums here, on fabo.
why dont we give the seller good notes and leave the conversations where they belong, in some other discussion forums here, on fabo.
That .100 thou difference is 2 compression points on a 340. Kim
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