LS7 block on truck style heads.
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Teching In
Joined: Jun 2019
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LS7 block on truck style heads. So this is probably far fetch. So I might be getting a ls7 block and I know I can bolt up any LS head to it but I was wondering if anyone had any idea what the power would look like if I was using my 706 heads on the block. I was wondering if I would be loosing power.
This engine would be going in a mk3 supra.
This engine would be going in a mk3 supra.
if the pistons are dished, it's fine. Head gasket thickness will take care of that. if flat topped or domed, you must be running very high compression, because the chambers are so small. If you are, you likely will want custom pistons so you can specify exactly what you want.
If you need to ball on a budget I would at least get rid of those heads and cathedral intake and do LS3 heads and intake, you can find them used pretty cheap and would be a much better combo
You'd also keep the 11.0:1 compression since LS7 heads and LS3 heads share a 70 cc chamber.
With the 706's on the LS7 you're looking at 12.2:1 which is pretty high. Can be done, but needs to be done right.
You'd also keep the 11.0:1 compression since LS7 heads and LS3 heads share a 70 cc chamber.
With the 706's on the LS7 you're looking at 12.2:1 which is pretty high. Can be done, but needs to be done right.
Last edited by 00pooterSS; Apr 7, 2020 at 05:29 PM.
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Thread Starter
Teching In
Joined: Jun 2019
Posts: 14
Likes: 1
If you need to ball on a budget I would at least get rid of those heads and cathedral intake and do LS3 heads and intake, you can find them used pretty cheap and would be a much better combo
You'd also keep the 11.0:1 compression since LS7 heads and LS3 heads share a 70 cc chamber.
With the 706's on the LS7 you're looking at 12.2:1 which is pretty high. Can be done, but needs to be done right.
You'd also keep the 11.0:1 compression since LS7 heads and LS3 heads share a 70 cc chamber.
With the 706's on the LS7 you're looking at 12.2:1 which is pretty high. Can be done, but needs to be done right.
thanks for the info I’ll see if I can sell my ls6 intake with the heads and do the ls3 heads and intake.
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Verdad Gallardo If you need to ball on a budget I would at least get rid of those heads and cathedral intake and do LS3 heads and intake, you can find them used pretty cheap and would be a much better combo
You'd also keep the 11.0:1 compression since LS7 heads and LS3 heads share a 70 cc chamber.
With the 706's on the LS7 you're looking at 12.2:1 which is pretty high. Can be done, but needs to be done right.
You'd also keep the 11.0:1 compression since LS7 heads and LS3 heads share a 70 cc chamber.
With the 706's on the LS7 you're looking at 12.2:1 which is pretty high. Can be done, but needs to be done right.
Agree. Richard holdener did a back to back of a LS3 intake and a rectangle port truck intake and they dynoed the same, like identical the same..
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An LS3 top end is a good suggestion.
I would also suggest to get a set of 243 heads and have TEA do their stage 2 port and valve work.
With around 330-340cfm on a 4.125 bore and with a 229cc intake runner, the engine would be super responsive and torquey and still make a good top end number.
But you would need to run a Fast 102mm cathedral intake as the ls1/ls2 gm intakes are junk.
I would also suggest to get a set of 243 heads and have TEA do their stage 2 port and valve work.
With around 330-340cfm on a 4.125 bore and with a 229cc intake runner, the engine would be super responsive and torquey and still make a good top end number.
But you would need to run a Fast 102mm cathedral intake as the ls1/ls2 gm intakes are junk.