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post #1 of 2 (permalink) Old 01-04-05, 04:21 PM Thread Starter
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xpc66's Avatar
Join Date: Sep 2004
Location: Brisbane
Posts: 155
Valve Springs

Any thoughts on manufacture, spring rates, dual/single/damper, etc?

I have a hydraulic lifter setup, with E7 heads, net lift 0.4409" cam with 280°/280° advertised duration, early 351W valves (1.84/1.54) coupled to a 302 1970 block.

E7 installed heights are 1.78 in and 1.60 exh. I'm waiting for test data on their loadings. They are single springs

1976 spec 351W was 1.79 in and 1.79 exh with mean 75 lbs installed and 200 lbs at 1.34 valve open.

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post #2 of 2 (permalink) Old 01-05-05, 02:41 AM
Two SC 61's = trouble
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Join Date: Jul 2001
Location: Penrith,nswAus/Morrinville.NZ
Age: 63
Posts: 6,360
Re: Valve Springs

I like doubles as they have wider harmonic stability..I guess this is a flat tappet cam ?
If heads are off ? Machine for higher instal height so Chevy springs can be used...Plenty of combinations that way....

Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
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