Boosted 318ci
Are we talking about a LA 318 or a Magnum 5.2ltr/318ci ?? Are we talking about a roots, screw or centrifugal type superharger... Need to clarify, be specific, what the intended use will be also, is it just a street cruiser/brawler or is it going to be a track car or street/strip car ??, 91-oct, 93-oct, E-85, Race gas, methanol, what fuel are you planning on using ??... Doesn't really matter anyway, but the Magnum or RHS heads has far better flowing heads to begin with, before porting... O-ringed block deck, w/solid copper head gaskets, go to 0.050"-0.060" gaskets {An Absolute Must, if you want it to live under boosted power & not pop head gaskets regularly}, with that 9.5:1 stroker kit, that will knock the compression down enough, you will have a killer little boosted/supercharged 318, I would absolutely put an ignition retard tunable ignition system, for when boost comes on, that way then compression isn't as much of "real big" issue, you just back out more timing under more boost, then a pop-off relief valve {is an absolute must also}, to get rid of boosted pressure & back pressure, especially when you let off the throttle, after a balls out run & also an inner cooler {absolutely necessary}, to keep your intake Fuel/Air charge cool & dense, any boosted engine creates a ton of heat & that's your real enemy even more than compression, it will scream... I had a POS 100k mile 5.2ltr/318 97 Dakota 2wd that had a Powerdyne Centrifugal kit, I got at a swap meet, for $500, spent $1500 more to make it right, it was actually made for a SB-Chevy, I adapted it to the 5.2ltr/318 Magnum truck engine, it worked great, like with stated above parts & improvements, upto about 7psi-8psi 400-425hp @ 9:1 compression, beyond that, either lower the compression, with forged piston or with thicker gaskets to drop the compression &/or back off the timing a bunch more under boost, low compression isn't the only way to go, there's alway a way, you need to be creative sometimes & need to think out of the regular engine builders box... What type of fuel are you planning on running ??, if you use E-85 & it's redily available in your area, you can go higher compression easily.... Procharger, Whipple, Powerdyne, Magnum, B&M, BDS, Dyer, Noppie {spelling?}, Hampton, Littlfield, GMC Roots, Screwcharger & many more... With the proper camshaft for a blown engine is everything, beyond the ignition & bottom end durability & a quailty properly tuned & adaquate fuel system, intended for forced thru induction, I highly suggest you look into that seriously also , if it ever goes lean it's history & chances of banging/backfiring the blower, burning valves or poping head gaskets goes up ten fold... By the way it aint cheap, it's probably far less expensive to build a 500hp N/A 318/390+ci 4" stroker, with ported Aluminum cylider heads & a single 4bbl, Absolutely do your own research... :headbang:
