Quote:
Originally Posted by Skip Fix
"I have been running the 99893 springs at 160/400 for years and no issues."
Did you check they had that much seat pressure? The ones SD sent on my newer heads did not and had to be shimmed to about 1.770 to get there.
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Yes on my wife’s previous engine I did shim them to increase seat pressure to around 160 I believe.
Haven’t touched my engine though.
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 10.12@133 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
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