raised runner ls1 heads?
raised runner ls1 heads? Has anyone tried raising the runners on an ls1 head? I haven't seen much on the topic. I just picked up a single 241 head I plan to mess around with the ports on and one of the things I am going to try is doing a raised runner port. I will see about getting them flowed before and after if I can find a shop to cooperate and not charge me an arm and a leg.
You run the risk of having your valve spring pockets break off under the thinned out roof. Epoxy won't be strong enough. FWIW, 243 heads and all aftermarket LS1 heads have raised roofs and better short turn radii.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
none....i wouldnt raise it at all. GM spent tons of R&D and money desigining the GEN III head, its pretty good where its at. if you raise it at all, like PatG said, you run the risk of your valve spring pocket falling apart. especially if you use a stronger spring with a high lift/duration camshaft.
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There is a pretty popular vendor on here that had issues with an earlier version of their CNC program cutting too much out of the port ceiling right under the rocker and it caused the rocker arm to rip the port roof right out of the heads.
Instead, you could probably take material out of the sides of the port to get the port size back, just be cautious of the pushrod pinch area.
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Since this is strictly for fun and that is all i bought the head for (to play around with) i went ahead and epoxied the floor and the top of the roof. since the head will never be ran and is strictly a research piece i figured why not. here are some pictures of the epoxy with no other work done (waiting for it to harden) i didnt take note of how much epoxy i added but i'd say it was probably in between .100 and .150
and here is my roughly cut in exhaust port. i just did a very minor clean up and took the bump out right before the valve guide. i also did a little rounding of the valve guide as well as blending the valve seat into the port .
sorry for the cell phone pictures everyone!
tomorrow i plan on smoothing the epoxy out and beginning to raise the roof (while trying not to get too far into the rocker arm bolt hole!).
and here is my roughly cut in exhaust port. i just did a very minor clean up and took the bump out right before the valve guide. i also did a little rounding of the valve guide as well as blending the valve seat into the port .
sorry for the cell phone pictures everyone!
tomorrow i plan on smoothing the epoxy out and beginning to raise the roof (while trying not to get too far into the rocker arm bolt hole!).
i did a little work on the intake today, raising the roof and then removing the rocker bolt bump. i also went in and smoothed the epoxy out and rounded it into the chamber.
theres other spots your limited to on that casting. you built up the shortturn, that can be good. but your going to hit water shaping before you get to use that work. And you can't fix that east fix. The stock valve and port its limited. Then that casting doesn't have the bowl to use the roof raised. Dig it out and you can have somone good weld it up, still gona have the deal with the spring pocket, and the rocker stand, thats gona be weak and not play well for putting some spring, and cam on the motor and cause problems. You got the cart way before the horse, what are you tring to do? if you have no engine size, rpm, or even the valve size you making this port for. take a few steps back and work on your grinder control on a different port, If your just messing around with this. Get some tools to start measure the sizes of the stock port and see what you find there. Work on the just the valve job and that end of the port, and your be way ahead of what your trying to learn.
