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Dec 23, 15 · 275 Posts Discussion Starter · #1 · Dec 21, 15 I'm looking at a new GM SP3 crate engine for my 65 Chev/GM have dropped the ZZ3 in favor of the SP3, I'm not sure what is different between the two but the SP stands for special performance and Jegs has this engines available fresh from Chev/GM for under $6k freight inc to my doorMar 26, 16 · When the Fastburn 210cc heads were new, GM put together the limited run, only 430 produced, ZZ430 350cid crate engine It was a Fastburn 385 crate engine(210cc Fastburn heads, ZZ3/4 roller cam 8º/221º duration, on a 350 shortblock) which was rated at 385hp, with the LT4 hotcam swapped in(218º/228º duration 0525"/0525" lift with the 161 full rollerSep 09, 19 · I have a Chevrolet Performance SP3 Stroker which has been timed per their recommended Specs as detailed below "Install Distributor as follows (1) Locate cylinder #1 top dead center (TDC) (2) Rotate engine to 12 degrees before top dead center (BTDC) (3) Align