So I am back to the oem block and wondering what overbore it has since a 0.030" overbore will alter the compression ratio and require me to adjust my piston selection to maintain the compression I am shooting for. But I am not looking to spend $3,000+ on just a block and crankshaft. I just did the compression on a 3.85" stroker crank in a 351 and with 18.6cc dished pistons compression was right at 9.462:1 which with aluminum heads should run off 87-89 octane. Requires too big of a dished piston to drop the compression down. I dont want all this over bore or stroked. In the end I am just starting to confuse myself cause I want a "new" 351W block with a 9.5" deck with a 4" bore. It would suck to have a bigger engine with bigger heads and 1000cfm fuel injection and not even make 500. But it better be more than 450 cause I have a sbc pushing 500 with ported oem heads and a 650 holley double pumper. I am shooting for 500 hp but would be happy with 450hp even. Scratch the Boss 351 idea, I forgot when I last look the crankshafts were all over $1,500 a piece and they all used chevy connecting rods still and the shortest stroke was 3.75" and I am not wanting a stroker.Ĭlick to expand.Well in all honesty I think the 450 - 500 range is do able with 9.178:1 compression considering the big heads that are going to be used as well as the large amount of air/fuel the induction system will be supplying. Comes back to the block, the boss 351 block is nice and is very strong and comes unfinished at 3.990" bore so I could build a 4" x 3.50" factory new windsor but the price is killing me, crazy to have over $5,000 in an engine and not make much over 500 hp is $725.Īs far sa what I am trying to do is, I am trying to piece together a fairly efficent engine that is both streetable but like wise wont grenade itself when pushed on a road course track. Plus the price tag for the block alone is almost $2,000 where as the block from P.A.W. Could go with the ford racing boss 351 block but I hate the fact that it uses cleveland mains, its a pain finding a crankshaft that will work in that one. I might just in the end say screw it and get a new block. But doesnt say what the bore is, nor what the deck heigth is. out in california, the description says its line honed, decked and bored oversized. The block I am unsure of its coming from P.A.W. Keith Black Forged Aluminum 4" pistons with four valve reliefs 11cc total 1.774" compression distanceģ.50" forged 4340 crankshaft (with ford rod journals) Man-O-War 18 degree aluminum cylinder head 64 cc chamber 2.02"/1.60" valves (with Fel Pro 1031-L/1031R head gaskets 4.150" bore x 0.041" compressed) This is the list of parts I am wanting to go with.Ĭomp Camshaft custom ground hyd roller - 230*/236* 0.050", 0.513"/0.26" Lift, 112 LSA I am shooting for 500 hp and based off the man-o-war 18* aluminum heads I desided on matched with the 1000cfm edelbrock EFI induction with 9.178:1 compression I am coming up with 525 HP 6000 rpm and 4 RPM estimated off comp cam`s camquest cam selection program I dont have any of the stuff yet still selecting parts.
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