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navyflyer72
04-08-2006, 08:31 AM
I have a set of Thorley headers for my 327 sbc, I am contemplating a ZZ383 will they bolt up to this block, or will I need to change my headers?

-George

PARKERRS
04-13-2006, 06:00 AM
I have a GMPP fast burn 385, which uses the same heads as the ZZ383. If the thorleys worked before you will have no problem they will bolt to the heads fine and are a good port match. My problem has been on the 375y headers the right one is not bent correctly for my 73 camaro I am having clearance issues with the lower cta mount and the collector angles toward the trans, after two different sets from thorley. Driving to summit retail store today to compare with their stock or swap for a different brand that fits properly. First time I have ever seen a header that the collector doesn't point straight back but angles toward transmission.
Tommy Parker