7500 RPM reliably
Thread Starter
Joined: Jun 2005
Posts: 2,265
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From: Oskaloosa, Iowa
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Joined: May 2016
Posts: 1,292
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From: St. Louis
This thread needs an idle clip amongst the ego stroking. Cam motion custom centrifugal supercharger combo.
https://m.youtube.com/watch?v=CTg8oBDQt4U
https://m.youtube.com/watch?v=CTg8oBDQt4U
Im sure I’d make a good bit more power with 1 7/8 headers and a 3” exhaust. I like the sound though so exhaust is further down my list. I’d like to get better heads and possibly 6 bolt so I can use them long term. Of course I’ve got to keep some cash on hand since I’m still running a stock crank and a built 4l60e lol. I’ve got a few things pushed to their limits right now.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Stock 241? I've been thinking a lot of these 377 combos (if they have the right pistons) would benefit from just going back to the stock 317 castings? I have a funny little 376 combo with stock 706 heads on it, I had 853 before, that I play with that I think may actually ET better if I put the 317s back on it but it's in a completely stock chassis that car still has a stock converter and 2.73 gears it's a highway hauler, yours being a blower combo would certainly like the better flowing exhaust port and 317 heads are basically free these days I would try it it would hurt to mill them either
Already had the 241’s with good fresh springs so I reused them. I’m a believer in compression even with blowers. I’m about 10.6 to 1 now and don’t want to go lower. If I swap heads it will likely be an aftermarket casting.
I should be well over 800 rwhp now.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Stock 241? I've been thinking a lot of these 377 combos (if they have the right pistons) would benefit from just going back to the stock 317 castings? I have a funny little 376 combo with stock 706 heads on it, I had 853 before, that I play with that I think may actually ET better if I put the 317s back on it but it's in a completely stock chassis that car still has a stock converter and 2.73 gears it's a highway hauler, yours being a blower combo would certainly like the better flowing exhaust port and 317 heads are basically free these days I would try it it would hurt to mill them either
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Verdad Gallardo TECH Fanatic
Joined: May 2016
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From: St. Louis
You're basically telling me I need to try a much larger camshaft in my engine although my heads are completely stock with the stock little intake valve even on a flat top 4.0662" bore, it's got LS6 springs summit 8714 camshaft and BTR push rods same as my other setup I've revved it clean to 7, 000 on 5w40 though it makes peak power at 5,400 RPM with the LS6 intake crappy headers and said camshaft it's naturally aspirated though not boosted like y'alls
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
You're basically telling me I need to try a much larger camshaft in my engine although my heads are completely stock with the stock little intake valve even on a flat top 4.0662" bore, it's got LS6 springs summit 8714 camshaft and BTR push rods same as my other setup I've revved it clean to 7, 000 on 5w40 though it makes peak power at 5,400 RPM with the LS6 intake crappy headers and said camshaft it's naturally aspirated though not boosted like y'alls
You're basically telling me I need to try a much larger camshaft in my engine although my heads are completely stock with the stock little intake valve even on a flat top 4.0662" bore, it's got LS6 springs summit 8714 camshaft and BTR push rods same as my other setup I've revved it clean to 7, 000 on 5w40 though it makes peak power at 5,400 RPM with the LS6 intake crappy headers and said camshaft it's naturally aspirated though not boosted like y'alls
Wonder why more of the SBE record guys don't do LLSR, they spin well north of 8200RPM. Price? Wonder what the gains would be on a 8000RPM, 1250whp setup currently running a Summit cam. Guessing it would cost more than the whole engine combo to switch it all out for a few hp.
Also, they're fine with getting 10 or so miles out of it, probably be fine with less (10 miles is 40 1/4 mile passes)
See if speed engineering makes headers for it. They fit great and they're cheap. Had mine for almost 3 years. Zero issues.
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Joined: May 2016
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From: St. Louis
Goes against going as fast as possible on stock stuff. And totally against the whole build. No point in putting 2k in valve train on a 500 dollar motor that gets boosted to the moon for a few seconds and then shut off. And like you were basically insinuating, the small percentage in power gain isn't worth it.
Also, they're fine with getting 10 or so miles out of it, probably be fine with less (10 miles is 40 1/4 mile passes)
Also, they're fine with getting 10 or so miles out of it, probably be fine with less (10 miles is 40 1/4 mile passes)
Does Speed Engineering making a 1 7/8 for the Goat? I'm used to Fbody stuff where 1 7/8 stainless LT's are like $300 lol.
I can report that the D1x is rated at 1075 hp with a max impeller speed of 62,000. I'm spinning it to 64,000 impeller speed and it doesn't stop making boost seeing 20 psi peak at 7000 rpm. I'm running 1 3/4 headers with a 2.5" magnaflow catback and the stock 241 heads so there is still some power to be made with this blower before going bigger. Impressive little blower.
~11'ish years ago when I had a blower, I had Doug Thorley tri-y headers 1 3/4" runners to a stock style 2.5" collector to a dual 2.5" homemade exhaust on the car. I was like man this crappy exhaust setup has to be costing power, so I spent a bunch to get shiny new Kooks with 3" collectors and a catless dual 3" exhaust, looked good, sounded good but gained less than 15whp on the dyno.
I don't think he's near 900whp yet, but I've seen 900+whp through a 2.5" Corsa exhaust. Look at the CTSV guys making 750+whp and running 9's with a completely stock exhaust, doesn't seem to be a huge restriction. They argue all day if headers are even worth it, they just turn up the boost or spray it. If its that big of a concern get a boost actuated cutout for way less than a full exhaust.