418 build-to port or not to port ls3 heads?
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418 build-to port or not to port ls3 heads?
I am building a ls3 418 tsp kit -4cc flat tops, combo adds up to 11.25:1 compression. I have already asembled the heads with patriot extreme dual valve springs ti reatiners and manley ss valves. I am now reconsidering disassembling the heads and having them cnc ported. I have talked to Richard at wcch and it looks like it will cost about $900. The car will be 90% street/10% strip. I will be running a victor jr with 1 7/8 long tubes. I will be running a 100-150 shot. I have not had a cam spec'd yet, but plan to have patrick g do it. The big question is...is it worth it to port my heads or stay stock with the current set-up. What type of gains are people seeing and would you do it over again?
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Thanks! I agree, I am just a little turned off by the 30hp gain. ~$900 for 30hp?! I talked to both tea and wcch and definetly felt more comfortable with Richard doing the work. I was thinking the n20 would make up for lack of porting which is why I initially assembled them stock. Does anyone have back to back dyno runs ported/ stock?
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Thanks! I agree, I am just a little turned off by the 30hp gain. ~$900 for 30hp?! I talked to both tea and wcch and definetly felt more comfortable with Richard doing the work. I was thinking the n20 would make up for lack of porting which is why I initially assembled them stock. Does anyone have back to back dyno runs ported/ stock?