383 or 408?
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I'm trying to decide on what i should do. I just put a set of PRC CNC 243's on my Trex LS1 and ended up with the bottom end knocking a month later. I want to upgrade the engine so I'm thinking of either a 383 or a 408. I would like to get the 408 but are my heads too small? I don't wanna put my practially brand new heads to waste. If i'm looking to hold on to the heads should i get the 383 instead of the 408?
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Originally Posted by TheCarKid
I'm trying to decide on what i should do. I just put a set of PRC CNC 243's on my Trex LS1 and ended up with the bottom end knocking a month later. I want to upgrade the engine so I'm thinking of either a 383 or a 408. I would like to get the 408 but are my heads too small? I don't wanna put my practially brand new heads to waste. If i'm looking to hold on to the heads should i get the 383 instead of the 408?
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both will be an upgrade over the 346 but i vote for the 408. a 408 shortblock compared to a 383 isn't that much higher if you buy them both as a shortblock.and as beast has said just have the chambers opened up for a 4.030 bore which will unshroud the valves and add some cfm of flow.
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Originally Posted by slow trap
both will be an upgrade over the 346 but i vote for the 408. a 408 shortblock compared to a 383 isn't that much higher if you buy them both as a shortblock.and as beast has said just have the chambers opened up for a 4.030 bore which will unshroud the valves and add some cfm of flow.
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Originally Posted by david vericker
If you intend to build a good quality motor,starting with the short block. Then there is a considerable difference in the pricing of a 383 vs 408. If you don't beleive me - check out the CARTEK web sight.
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thanks a lot guys for all your input. hopefully i'll get all this done before the weather turns nice again. i think i'm prolly gonna go with the 408, but we'll see. thanks again to all who responded.
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Originally Posted by TheCarKid
thanks a lot guys for all your input. hopefully i'll get all this done before the weather turns nice again. i think i'm prolly gonna go with the 408, but we'll see. thanks again to all who responded.
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