Can someone set the record straight?
10-07-2012, 12:44 AM
#1
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Can someone set the record straight? I've been reading all night about LQ4 and LQ9 engines. I have one and I'm wanting some more hp before I put it into my 67 Nova. I'm on a budget (like everyone else) and I read that the Ls3 stock heads will work with the lq4/9 block but I have to watch my PTV clearance.. I PM'd a vendor on hear and he told me to stay away from them b/c I'll lose my hp/tq down low. He mentioned to go with the ported 243 heads. At $650 for the pair of LS3 heads it just seem like a sweet head with a custom cam. I really don't want to mess with the bottom end, so this is either a go or no go for me. I'm looking for the 450rwhp range with heads, cam, ls3 intake, and headers.
Jason
Jason
10-07-2012, 07:28 AM
#2
I've been reading all night about LQ4 and LQ9 engines. I have one and I'm wanting some more hp before I put it into my 67 Nova. I'm on a budget (like everyone else) and I read that the Ls3 stock heads will work with the lq4/9 block but I have to watch my PTV clearance.. I PM'd a vendor on hear and he told me to stay away from them b/c I'll lose my hp/tq down low. He mentioned to go with the ported 243 heads. At $650 for the pair of LS3 heads it just seem like a sweet head with a custom cam. I really don't want to mess with the bottom end, so this is either a go or no go for me. I'm looking for the 450rwhp range with heads, cam, ls3 intake, and headers.
Jason
Jason
10-07-2012, 08:48 AM
#3
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Thx for the reply. But I haven't seen any ported ls heads under $1000? If they will be about
the same in performance and the ls3 heads are cheaper and will work fine with no loss in performance then why not use them? I was told that with anything under a 4.1xx bore the ls3 intake runner and valves are just to large for the 4.0 bore block.
the same in performance and the ls3 heads are cheaper and will work fine with no loss in performance then why not use them? I was told that with anything under a 4.1xx bore the ls3 intake runner and valves are just to large for the 4.0 bore block.
10-07-2012, 09:20 AM
#4
Thx for the reply. But I haven't seen any ported ls heads under $1000? If they will be about
the same in performance and the ls3 heads are cheaper and will work fine with no loss in performance then why not use them? I was told that with anything under a 4.1xx bore the ls3 intake runner and valves are just to large for the 4.0 bore block.
the same in performance and the ls3 heads are cheaper and will work fine with no loss in performance then why not use them? I was told that with anything under a 4.1xx bore the ls3 intake runner and valves are just to large for the 4.0 bore block.
10-07-2012, 10:21 AM
#5
the big valves of the ls3 head mite hurt flow on a smaller bore .check Texas Speed for heads,ls6 st 1 or 5.3 st 2.5.you could sell your stock heads to off set the cost of ported heads.
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10-07-2012, 04:02 PM
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