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Originally Posted by Cerberus66
(Post 4851062)
SCORE,
those are 9:1 pistons (Dished) you have to remember though. The head combustion chambers are much smaller than any 8.1 vortec head. A difference of 114cc to 78-83cc maybe even 87cc I forget exactly. But it is a big difference. Thanks for the oil pan pics. I didnt feel like dropping the pan today too. lol |
Originally Posted by Cerberus66
(Post 4851055)
The intake is set up for LS TB, you can put on 103mm and even a 107mm TB
The intake tracks are 14 inches long The intake was designed by Arizona Speed and Marine Jim Shofner. The intake was designed so you can remove the bottom and tune the runners. Oh my God, so bad azz I cant even stand it! From my understanding and many long conversations with Ray (Raylar) many moons ago, the stock really wasnt that bad. I have the Raylar cool air Shoebox intake. But I am sure the PSI (intake above) Is a BEAST!. Wish I got my hands on that when I did my rebuilds. Really COOL piece! However, its still like the really hot girl at the gym that has a great body, great personality and an ugly face - Its not pretty to look at but it does some great things. Dude, you have to drop the Raylar 206 cam (600 HO Cam) or better yet 213. You'd have to be in the 700 HP range. |
Whats the bore and stroke of the PSI 8.8?
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Originally Posted by Keith Atlanta
(Post 4851068)
Whats the bore and stroke of the PSI 8.8?
These late production PSI engines sure do look nice. Its a shame they have teeny-tiny camshafts in them. Ill bet a healthy cam and new comp beehive springs would really wake up this beast. |
8 Attachment(s)
Originally Posted by Keith Atlanta
(Post 4851067)
Dude, you have to drop the Raylar 206 cam (600 HO Cam) or better yet 213. You'd have to be in the 700 HP range. This is probably my biggest concern right now... picking the right cam, as it will need to be big enough to make good power, work well with the LS style heads... but not suck water through wet exhaust. The rest of the build is pretty basic common-sense stuff... I have no problem with running a big cam. I am all about the "go-big or go-home" mindset. lol I just need it to work in a wet exhaust environment... which is another big expense I will incur. My engine sits pretty low in the hull so there are 6" spacers between the manifolds and risers. Whatever exhaust I decide on will need to fit with the current thru-hull Corsa system and the factory Y-pipe. |
Originally Posted by Cerberus66
(Post 4851046)
Email me so we can exchange numbers, we can video chat also and i can show you what you have. GREAT find! [email protected]
you have the best oil pan ever made for the Gen 7. It is baffled and absolutely the best built. When I get these engines busted apart and start buying parts... you will be my first phone call. I am in the very early stages of building a 30x40 2-story garage at my place. Variance hearing is set for 12/6 and assuming both variances are approved, I should have a working shop by mid/end of January. Once the shop is built, I will get the boat inside and both 8.8's torn down for the machine shop. Your phone will be ringing shortly after that. lol Thanks !!! |
Originally Posted by Cerberus66
(Post 4851057)
As for cam and springs, The springs on these motors measure 45lbs seat pressure and 95lbs open. They suck because they are designed for VERY small camshaft. You will see when you pull the cam, its very small.
The heads need bronze valve guides, They accept Pontiac type valves. Your head guy should be able to ID the proper ones. Keep the stems small as per the design. The rocker arms are LS7 Exhaust rocker arms, PSI uses them on both intake and Exhaust. We are rebuilding the trunnions with CHE trunnion upgrades. As for Raylar Cams on this head and engine combo......DO NOT TRY IT. you will be very disappointed. A custom ground cam is MUCH better. The head flow and velocity totally change the cam dynamics required to make power. The closest thing i can say is to use cam specs or design like a lsxr454 etc. We are working on these heads now. We are trying different valves sizes and designs. Remember these heads are true 15 degree BBC heads. A very radical difference from what most shops know. The flow and velocity of these heads changes everything BBC research has ever done. We have produced 600hp x 600lbft motor on a very mild cam using stock items. Those heads will flow about 420-430cfm. We will be publishing our results and offering CNC porting on them. We are going to a 900-1.00 lift cam with a LSA of 116 on our premier motor and shooting for 900-1000 hp NA.
Originally Posted by SB
(Post 4851058)
Do these accept standard exhaust ? If no, does someone make them for marine and how much ?
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Originally Posted by Dragracer_Art
(Post 4851093)
This is probably my biggest concern right now... picking the right cam, as it will need to be big enough to make good power, work well with the LS style heads... but not suck water through wet exhaust.
The rest of the build is pretty basic common-sense stuff... I have no problem with running a big cam. I am all about the "go-big or go-home" mindset. lol I just need it to work in a wet exhaust environment... which is another big expense I will incur. My engine sits pretty low in the hull so there are 6" spacers between the manifolds and risers. Whatever exhaust I decide on will need to fit with the current thru-hull Corsa system and the factory Y-pipe. I have the Dana's with long risers on 600 cams and never had a problem. Talk to Larry, but I am pretty sure the 600 wont revert even with standard Dana risers. With the extended risers, they are longer and have little anti water block ramps. FWIW, to go this far and drop a small cam in to save $500-1000 on a cheap riser would be sacreligious. https://cimg7.ibsrv.net/gimg/www.off...26876bfc29.jpg |
Originally Posted by Keith Atlanta
(Post 4851107)
The Raylar HO 600 (206) is more than adequate. I never had problems with reversion. Your only real cost effective choices IMO are CMI e-tops, Stainless Marine, or Dana Marine. Im not a fan of Dana anymore for salt water becasue I have seen rot. On the manifold style headers (Dana/Stainless) you can pay a little more and get longer risers.
I have the Dana's with long risers on 600 cams and never had a problem. Talk to Larry, but I am pretty sure the 600 wont revert even with standard Dana risers. With the extended risers, they are longer and have little anti water block ramps. FWIW, to go this far and drop a small cam in to save $500-1000 on a cheap riser would be sacreligious. https://cimg7.ibsrv.net/gimg/www.off...26876bfc29.jpg I ran Stainless Marine on a previous small block mercruiser and really liked them. I may go that route... but have been looking at the CMI's pretty hard too. The biggest problem for me is swallowing that big $$$ pill... for what (to me) amounts to nothing more than a set of $99 Blackjack boat headers. My heart bleeds for you guys with TWO pairs of them. lol |
You guys have me on ignore ? :lolhit::party-smiley-004::lolhit:
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