#11
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Sonic test it to be certain .....cylinder wall thicknesses can be all over the board on the same block even within the same bore,so be sure to measure 4 places on each bore . 854s are decent for boring to 427 but #962s are the best.....
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Ebay Auctions http://www.ebay.com/sch/427-king/m.h...=16&_rdc=1 No Fisher priced toys here |
#12
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I've got a 854 L78 block. I removed the center plug and checked the space between the cylinders with a pencil and it went through. I don't think I would bore this block to 4.250.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed |
#13
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Quote:
Keep the L78 for L78 stuff or people. IF your looking to go fast, the added bore will help some, but in the end is it really going to be worth it? I myself see no reason for this unless to mislead people or a class by claiming to be a L78/396 and be stroked? Like some sort of stock-block class. FYI I did a mild 402 to 575Hp back in the 90's with mostly GM stuff. Used OEM L78 short block, Ported sq port closed chamber heads, strip dom intake and comp .660 solid roller. Ny '69 Nova would run 10.40's with 9" slick, thru muffler and 4.56 and M21. I'm sure with what we know now, I could put that deal in the high 9's or low low 10's, WITH A OEM "163" intake. So tell us WHY your thinking this bore? Thanks, John
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'58 Apache pick up restomodding with twin turbo 522 '78 Z28 4sp being restored '78 Z28 32,000 survivor, Og Yellow paint, AC. '70 W30 convert TRIBUTE '70 CANADIAN Nova SS396 L78 Pro Street '69 CANADIAN Nova SS 396/350 hp '67 CANADIAN Nova SS 427 10 sec. driver '66 CANADIAN Nova SS Race Car '69 FIREBIRD Tubbed Racecar '61 CANADIAN Pontiac Bubble top 409+/4sp (SOLD) '31 ALL STEEL Chevy P.U. GONE (EX-WIFES NOW) |
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#14
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There is a reason why stock and super stock guys use SLEEVED 454 blocks to go back to 396 also!!!!!
Your friend could very well run into a overheating issue too with that thin of a cylinder wall.
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'58 Apache pick up restomodding with twin turbo 522 '78 Z28 4sp being restored '78 Z28 32,000 survivor, Og Yellow paint, AC. '70 W30 convert TRIBUTE '70 CANADIAN Nova SS396 L78 Pro Street '69 CANADIAN Nova SS 396/350 hp '67 CANADIAN Nova SS 427 10 sec. driver '66 CANADIAN Nova SS Race Car '69 FIREBIRD Tubbed Racecar '61 CANADIAN Pontiac Bubble top 409+/4sp (SOLD) '31 ALL STEEL Chevy P.U. GONE (EX-WIFES NOW) |
#15
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NO
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#16
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The reason there sleaved down 454s is to move the bore away from the intake valve. My engines are aways filled for NHRA stock.
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