852/706 head and valve modification question
Thread Starter
Teching In
Joined: Jan 2013
Posts: 15
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852/706 head and valve modification question Hello all,
I was wondering is it possible to stuff 2.100" intake valves and 1.600" exhaust valves into the 852/706 heads?
I want to keep the small combustion chamber since im running the stock 5.3 bottom end (9.5:1 I believe for the 99 models) my main concern is valve clearence as far as quinch and intake head vs exhaust head inside a 61cc head.
I plan to fully port the heads and the ls6 intake as far as I can. (Will be done by a shop)
I have been doing some research and have read that the port and polished heads (706) can flow just under 300cfm
Im only going to be shoving nitrous through the heads at the moment but planning for a twin turbo set up in future.
Any and all input is appreciated
Thank you
Jessie
I was wondering is it possible to stuff 2.100" intake valves and 1.600" exhaust valves into the 852/706 heads?
I want to keep the small combustion chamber since im running the stock 5.3 bottom end (9.5:1 I believe for the 99 models) my main concern is valve clearence as far as quinch and intake head vs exhaust head inside a 61cc head.
I plan to fully port the heads and the ls6 intake as far as I can. (Will be done by a shop)
I have been doing some research and have read that the port and polished heads (706) can flow just under 300cfm
Im only going to be shoving nitrous through the heads at the moment but planning for a twin turbo set up in future.
Any and all input is appreciated
Thank you
Jessie
I was just talking about getting the valves to fit in the head. They could fit in a 5.3L bore and clear the pistons depending on the cam, but with nitrous and eventually a turbo, what's the point? Why a 2.10" valve anyways?
Thread Starter
Teching In
Joined: Jan 2013
Posts: 15
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I was told at a younger age that an engine is like an air pump so the more air it can flow the better so I figured why not go up to 2.10" in. Hot rod magazine went with 2" in. In 706 heads on a 5.3. And got tremendous results.
Another reason I figured 2.10" in. Was look at the camel hump heads off of a gen 1 sbc compared to regular heads. Due to chamber size and valve size its like flushing a toilet vs draining a sink. (Bad analogy, but see my point?)
Im obviously not the wisest guy when it comes to volumetric efficiency or flow rate by any means. hints me asking you guys.
Thanks for all the input thus far
Like previously stated any and all input is appreciated cant learn without trying or asking questions.
Another reason I figured 2.10" in. Was look at the camel hump heads off of a gen 1 sbc compared to regular heads. Due to chamber size and valve size its like flushing a toilet vs draining a sink. (Bad analogy, but see my point?)
Im obviously not the wisest guy when it comes to volumetric efficiency or flow rate by any means. hints me asking you guys.
Thanks for all the input thus far
Like previously stated any and all input is appreciated cant learn without trying or asking questions.
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I was told at a younger age that an engine is like an air pump so the more air it can flow the better so I figured why not go up to 2.10" in. Hot rod magazine went with 2" in. In 706 heads on a 5.3. And got tremendous results.
Another reason I figured 2.10" in. Was look at the camel hump heads off of a gen 1 sbc compared to regular heads. Due to chamber size and valve size its like flushing a toilet vs draining a sink. (Bad analogy, but see my point?)
Im obviously not the wisest guy when it comes to volumetric efficiency or flow rate by any means. hints me asking you guys.
Thanks for all the input thus far
Like previously stated any and all input is appreciated cant learn without trying or asking questions.
Another reason I figured 2.10" in. Was look at the camel hump heads off of a gen 1 sbc compared to regular heads. Due to chamber size and valve size its like flushing a toilet vs draining a sink. (Bad analogy, but see my point?)
Im obviously not the wisest guy when it comes to volumetric efficiency or flow rate by any means. hints me asking you guys.
Thanks for all the input thus far
Like previously stated any and all input is appreciated cant learn without trying or asking questions.
I'm one of the latter. I want the biggest valve possible, but 2.1" may not have enough clearance from the bore in a 3.78" bore. I would probably go with a 2.040" max.
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