SBC cylinder head identification
(Changed "H' from "1970 LT-1 Z28 use c/n 492" to 186. 492 heads were Tonawanda cast heads and Tonawanda didn't have the machining tooling to unshroud the large 2.02 intake valves until 1971) |
|||
| Line 144: | Line 144: | ||
*1971-up heads with casting numbers 882, 993, 487, 336 (and others) can have 3/8" exhaust stems as well as 1.72" intake valves. Heavy 20-30 Series truck uses these, mainly. Both small 1.72" intake and 3/8" stem exhaust valves may be found on c/n 261, 624. Also 1987-'95 center bolt valve cover-type head c/n 14102191 can also have the 3/8" exhaust valve stem. | *1971-up heads with casting numbers 882, 993, 487, 336 (and others) can have 3/8" exhaust stems as well as 1.72" intake valves. Heavy 20-30 Series truck uses these, mainly. Both small 1.72" intake and 3/8" stem exhaust valves may be found on c/n 261, 624. Also 1987-'95 center bolt valve cover-type head c/n 14102191 can also have the 3/8" exhaust valve stem. | ||
| − | *Usually swirl port TBI SBC heads are not used in high performance applications because they run out of breath earlier than the | + | *Usually swirl port TBI SBC heads are not used in high performance applications because most builders dont habe a clue on the flow specs. They also dont take into accoint that these heads produce gobs of low end torque. Although they run out of breath earlier than the vortec heads if paired with the proper cam these heads a monsters in the 1/4 mile. Some casting numbers for them are 187, 191, 193. Similar to the [http://www.crankshaftcoalition.com/wiki/Swirl_port_SBC_heads swirl port heads], but without the swirl-inducing vane are c/n 14011083 and 14096217. |
==Current head casting/part numbers, specs== | ==Current head casting/part numbers, specs== | ||
Your Privacy Choices