xdanny510x

once again i changed the setup of the 408 stroker i wanna do on my silverado ...and probably leaning toward the texas speed stroker block but my question is how does this build seem ..would this be a killer 408 and i kno probably that im going to need a custom cam for this..
i believe this set up is gonna bring the compression up to about 11.6:1 on 0.055 gasket thickness
and with the setup gonna run maybe a 150-200 shot till the summer
408 cid short-block
diamond -2cc flat top pistons
callies compstar 6.125 ls1 rods (i was gonna origianlly do eagle h beam)
callies compstar crankshaft ( was gonna do eagle crankshaft)
total seal plasma moly/napier 2nd ring set
with slps
Cylinder Head and Manifold Package, SLP/L92 Drive by Wire (64cc)
SLP's L92 cylinder heads are surfaced milled and come with a CNC'd finished chamber. The combustion chambers are set at 64cc's (stock 70.2cc) and come with Competition Cams 918 valve springs (SLP# 53003) which are set to the proper install height and titanium retainers (SLP# 53104). Also, included are eight L92 offset 1.7 intake rocker arms and two L92 rocker arm pedestals.

TurboBerserker

iTrader: (1)

I admit I get confused with all the setup checking that goes on here, but weren't you going to go turbo in a year or so?

If so, this would be a pretty bad move IMO -- too hard to reset to FI from here.

If it wasn't you, or you've changed to N2O, then this looks pretty stout and a lot of fun.


Since you are going to worked heads anyway, any particular reason you like the L92s? It can be done cheaper (and more reliably imo) with 317s.

xdanny510x

yea i was gonna go turbo but that was when i had the 5.3 and since im going bigger i was thinkin about having some spray but later on upgrading to F/I but im assumign since my compression is high a turbo o a s/c is a bad thing?

sleek silverado

iTrader: (4)

You would want a low compression for FI. From what I understand, you can use nitrous at any CR.

xdanny510x

how bout if i get my compression around to 10: sumtihng would i be able to run both without hurting anything' or would i have to go like to 9: ???

sleek silverado

iTrader: (4)

You can run a blower with a 13:1 CR, but you limit yourself to how much you can push the blower. With a high CR, and blower you will experience detonation at a lower psi, rather than a lower compresion. At a 10:1, you could run a blower just fine and make good power. If you know you are going FI, then go for the lower CR. Especially if you are building the motor. The other consideration is the blower it self. If the max is 10 psi on a 408, then you might want a higher CR (10:1 or around that), but if you plan on a PT-88 turbo, then go with a really low CR (maybe 8.5:1). The biggest thing is do your research. Don't just take my opinion. Figure out what you want to get out of your truck.

thunder550

iTrader: (70)

Yep, as stated above, decide where you're going with the truck first and build towards that goal. Don't compromise your long term goal for short term fun....you'll end up with a setup that isn't optimized for either N/A or FI and you'll have a lot of money into it.

xdanny510x

ok i came to the conclusion that i am gonna go F/I so what should i arrange my COmpression at? BUt in the meanwhile Im going to use nitrous.. so should i go with 10:1, as howsleek_silverado SAID that i could run a blower just fine and make good power. If you know you are going FI, then go for the lower CR. Especially if you are building the motor.
or should i lower it more?
oh and as far as why i choose those heads/manifold its cause a tech recommended them to me due to that they are the best bang on the market right now ..that give great power...

Stoichiometric

iTrader: (10)

I would shoot closer to 9:1. When you add n2o or boost, it allows you to fill your cylinder to the same pressure you would shoot for N/A but at an increased volume. The lower compression will also allow you to run a reasonable amount of boost on 91 octane. Lower compression will take away off boost power, so there is a compromise to think about.

xdanny510x

so then shoot for something in the middle?