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5 broken springs this year

Hey Traviss, Did you get a chance to ck out the Iskys? What are you using for rockers? I have been thinking about Harland Sharps. Dwight

Whitey,you are close to my choice of valvetrain.
Crane make great cams and lifters.
Isky is my only choice for springs.
And I use Harland Sharp rocker arms,
but I think Crane gold Will do the job.

I looked into the isky's a little bit. I need a spring around 1.968" installed height 160-170 lbs on the seat and 420-430 lbs open. Thats the specs that crane recommends.

I run the crane gold roller rockers. I plan on using them again this year. But if money comes along, i'll switch over to a shaft mounted , jessel, t & D ect.

Off to work i go, have a good day

What he said!!!

Try Pacaloy springs. I have 200 hrs with pretty big cams on BBC. Complete roller assembly is Crane except for Pacaloy springs. Ask someone who builds motors. Isky has a good rep and so does Pacaloy.

Pacaloy is a brand name. Rod Dash @ Performance Marine in Oshkosh,Wi. built my motors and he used Pacaloy. I tend to trust the guy that builds lots of motors and Rod builds lots. My motors have been absolutely bulletproof for 300 hrs. I changed all top end stuff at 225 hrs just for good maintenance sense and as recommended by Rod. My motors are not 1000hp SC beast motors, but rather are 502EFI's with lot's of mods and make about 570HP reliably.

Give Rod a call 920/236-4220

I just installed a set of the Isky 8205-PLUS.
These are the "Endurance plus series, extreme high endurance"
They are not the standard 8205 as these have tool room outers. Said to be the best they sell in this size.
At 1.906 they are 144 lbs and 434 lbs at .635 lift.
These are said to be the perfect numbers for the Crane 741 cam with crane hyd roller lifters.
I do know where you can get a great price on these if interested.
Dave

I, unfortunately, have a lot of experience with valve springs on big blocks.
I have tried nearly all the top brands, including titanium springs.
Used to kill 1-5 valve springs PER RUN on our 437" motor. In it's defense, my shifting was not exactly "spot-on" in the early days, and we did run it to 9800 RPM.
Anyway,
Comp springs were the best we could find. Didn't try ISKY though. Titanium springs held their pressure for several runs without losing ANY strength at all-until they broke with no warning.

After a re-build and cam change, Sonny spent lots of time checking and correcting valve train geometry. Spring problem cured.
I would look there first.

good point summer obsession. When i built this motor last april, everything was brand new, i was able to check and double check my valve train geometry a few different times. It was always right on the money. I will have to check the valvetrain geometry all over again cause I am using different head gaskets and decking the block on this build


Travis