346 high compression build
Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
Agreed. If you use the age old 4% power increase per point, with an engine that has 400hp that’s around 70hp from compression increase alone going from 10:1 to 14:1. Obviously the more power the base engine has before the compression increase the higher the gains will be.
My LS370 build is around 12:3 static and 9:6 dynamic and I probably should have milled the 823's some and went with .040 MLS over the .051 to get the compression up some more but we'll see how it goes.
Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
Hindsight is always 20/20, thats my biggest gripe about the rectangle port stuff is the massive chambers
I was debating on which way to go as I do have a set of cathedrals but finally decided on rectangular ports. My cam is probably considered a baby cam by most which is 238/246 .633 SL 111+3 but its probably just right for my application. I may end up going to a solid roller and run either the Holley High Rise or a CID later on once I get everything together. I'm thinking if I can get the car down to 3,000 with me in it powered by an LS370 with a Powerglide and MWC 9 then I could reach the 10's N/A...
Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
I was debating on which way to go as I do have a set of cathedrals but finally decided on rectangular ports. My cam is probably considered a baby cam by most which is 238/246 .633 SL 111+3 but its probably just right for my application. I may end up going to a solid roller and run either the Holley High Rise or a CID later on once I get everything together. I'm thinking if I can get the car down to 3,000 with me in it powered by an LS370 with a Powerglide and MWC 9 then I could reach the 10's N/A...
3600#
3.73 gear
3600 stall 60e
232/236 .610/.615 112
cartek 2x 241 heads
ls6 intake
sbe ls1
runs 11.3’s in 3500 da full interior lol. Impressive little bastard
Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
spent some time tonight cleaning up some casting slag in the Holley. I ordered some finer grit rolls and a bunch of cross buffs to really get it polished up nice.
Im debating on the ecu. The car already has a really nice stock gm harness and ecu I built for it, but I’ve got an ms3 goldbox xtra on the shelf meant for my s488 gto. The gm ecu will
donthe job but at the same time it might be nice to get some tuning experience with the ms3 stuff n/a before I go to the boosted car?
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Verdad Gallardo Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
Final step, wife helped me pull the ls1 out of her 73 camaro so I can get the block prepped. I set the intake on the heads and there’s a 1/16 of an inch or so lip all around the head port, so I’ve got some work to do on the heads for sure. Taking everything over to the machine shop for balancing
Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
people, I used to do it after work for supplemental income for my hobby, but it started to get to where I couldn’t keep up and then the company I worked for went out of business so i said F it. I do a lot of ls swaps, budget turbo kits, f body rear ends, etc. I’ve been absolutely swamped and you can tell by looking at the shop, it’s a disaster this week and it’s driving me crazy.
I dropped the rotating assembly off at the machine shop this morning along with the heads to get decked another .020, making it .060 total and giving me a static compression of over 14:1.
I also ordered new 1/4 panels for the car and new wheel tubs so I can finish them.
TECH Regular
Joined: Jun 2008
Posts: 453
Likes: 14
From: Utah
Looking at the pics of the intake, where it bolts up to the heads the intake looks like it would take some thick o-ring type gasket, but then in post #55 where it looks like the gaskets that is being used is paper or whatever with the small little O-rings integrated into it. Is that the correct style to use on a setup like this? looks like it would have individual ones that fit into the large groves in the intake.
Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
Looking at the pics of the intake, where it bolts up to the heads the intake looks like it would take some thick o-ring type gasket, but then in post #55 where it looks like the gaskets that is being used is paper or whatever with the small little O-rings integrated into it. Is that the correct style to use on a setup like this? looks like it would have individual ones that fit into the large groves in the intake.
I have a small shop, I do a lot of work for local
people, I used to do it after work for supplemental income for my hobby, but it started to get to where I couldn’t keep up and then the company I worked for went out of business so i said F it. I do a lot of ls swaps, budget turbo kits, f body rear ends, etc. I’ve been absolutely swamped and you can tell by looking at the shop, it’s a disaster this week and it’s driving me crazy.
I dropped the rotating assembly off at the machine shop this morning along with the heads to get decked another .020, making it .060 total and giving me a static compression of over 14:1.
I also ordered new 1/4 panels for the car and new wheel tubs so I can finish them.
people, I used to do it after work for supplemental income for my hobby, but it started to get to where I couldn’t keep up and then the company I worked for went out of business so i said F it. I do a lot of ls swaps, budget turbo kits, f body rear ends, etc. I’ve been absolutely swamped and you can tell by looking at the shop, it’s a disaster this week and it’s driving me crazy.
I dropped the rotating assembly off at the machine shop this morning along with the heads to get decked another .020, making it .060 total and giving me a static compression of over 14:1.
I also ordered new 1/4 panels for the car and new wheel tubs so I can finish them.
Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
I hope so! I’ve been wanting to build a high compression stock stroke engine for some time. I wish I had the funds for better heads, but then they would kick my compression In the nuts. Ed Curtis has given me some tips on head porting so I’m going to do a little more work to mine when I get them back. I’m ready to get this show on the road. I wish it was as simple as dropping it in the car and she’s ready but I’ve got some work to do to the rest of the car also. I’m really, really curious to see what kind of power this thing lays down.
Thread Starter
Joined: May 2012
Posts: 1,796
Likes: 59
From: Elm Creek, NE
CC’d my heads 3 times, came up with 52cc each time with the current valves. So that puts things ending here, as long as the deck height is right at 0 like I’m figuring.