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#1
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I have a pair of swirl port heads from a 318. I want to put them on either a 318 or a 273 four barrel. How much of a difference will it make to put the larger 1.88" valves in and have it pocket ported? Should I go all the way and do 2.02" Or should I save my little money for some othere stuff and just do some simple porting myself, but leave the valves? I don't have a lot of money, but I want to get a little workhorse( and please don't tell me to go 360!) Would what I do depend on whether I run a 10.5:1 comp 273 for a 9.0:1 comp 318? Please Help! Joseph Tonna
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#2
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Going with the larger valves is a lot of money so i would just have them milled to bring up the comp.a good three angle valve job ,get a edlbrock performer duel plain manifold 600 to 650 4bbl vac sec and a 340 cam.then when you get a little more cash to play with go back into the heads and use the 1.88 int 1.5 exh open the bowls use a 30* valve seat blend around the larger side around the valve guid and gasket match the ports and blend it in about 1 to 1.5"in to the port.
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#3
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Thanks a lot! Do you know what years and models the 360 swirls came on? I understand the last numbers are 308. I want to look for some. Do you also know what a pair of the 302s or 308s are worth right off the engine? Thanks. Joecuda
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#4
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OK LET'S SEE the true swirl port head's from 87 to 91 were (302)and 88 to 92 were (308)the 86/87 are from the swirl port desighn but they have a hart shape combustion chamber.NOw as far as a price go's ??? it depends on what shape their in and wear you get them from.check the bone yards first i would say 50 to 300.
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#5
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What is the problem with the heart shape combustion chamber? Joecuda
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#6
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all the 302 heads have the closed chamber heart shape and the 308's are open chamber like an X head but the exaust side flows much better than an X head.
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