When I first built my car and engine I did alot of
assuming. First a buddy gave me a converter and I
was told it was probably a 4500 stall, well the first
time to the track VW's could EAT me up for the first
150'-200' and then she'd get going (11.4 passes)
this is in a 340 with W-2's all the good stuff
(ya sure) then I swap out the converter(which stalled
about 3000rpm) put in a high stall(5800rpm) and the
car picked up to a 10.60. Again ASSUMING that the
new W-2 factory built heads were ready to go...
well NOT, this went on for the rest of the season
running 10.60. When I pulled the Mopar springs
off the heads and checked, they were 68# at seat
and I'm running a .640 lift roller. From the moment
I let the trans brake go I was in valve float to the end
of the run. The only saving grace was I was in coil
bind the whole run and saved my pistons/engine, thank
goodness I had alot of clearance back then.Thats
when I found out about assuming about MP, the same
new set of MP springs(good to .640 lift) measured
the same 68# out of the box
NEVER ASSUME..... CHECK IT