Hey Guys, just a post about my current build and open to everyone's thoughts.

brand new 6.2 ls3 block,sleeved, bored 4.125
brodix ls7 sts 273 12 degree heads
2.250 / 1.614 Valves inconel
callies ultra h beam rods
scat forged LS crank
CP custom max compression +16.3 cc dome pistons with gas port vents 14.5:1 cr
Holly high rise ls7 intake with direct port

cam-undecided so far but will stay hydraulic

this is going in a max effort all out race f body camaro. looking to make as close to if not above 600rwhp/tq before hitting it with the nitrous. (direct port 250-300 shot)


any thoughts or advice on this build including any cam specs would greatly be appreciated..... what do you guys think the power level will be? we just built a 440 rhs block stroker with the same setup almost except the rhs block was 12:1 compression my block is about 14.5:1 compression. same intake and bore, 441 has a bigger crank... it made 750hp/6xxtq on the engine dyno( i forgot the tq numbers).... since i have about 14 less cubes but more compression should i expect to make more or less power? Rhs block is running Q16 and i will be running C14+ or c 16

pics coming soon, as we are assembling short block

thanks

 

Those are big valves! I'm curious to see how much room you have between them.

How high are you trying to spin it?

 

Is this all out race fbody camaro just a straight line car, or a road course car? Stick or auto?

As for predictions on power compared to the 440" rhs block... I think you will be close. Compression makes power.

 

I am curious why you would not consider a Low Lash Solid Roller
From CAM MOTION? Would be worth 30-40 HP, 600-1000 RPM, and
Probably 2-3 Tenths in the 1/4 on a similar spec (adjusted for lash)
Cam Vs a HR.

 

looks like a high rpm setup w/those heads and intake, yet an HR cam.
I think it will beat out the 440, but would like to see a better, more efficient valvetrain, IE SR.

Love the combo. would like to see how well the 14.5 works out.

 

He is right. Give the LLSR cam a good hard look.

 

Why stop at 427 cubes if it's going to be a pure racecar? Especially if you already have the real estate for more stroke and bore?

Open that **** up to 4.15x and a 4.125 stroke just like the 440 you mentioned.

 

Later he might want to go the turbo route or nitrous. We all know how those engine builders say stay with a 4 inch crankshaft for boosted/power adder applications.
Then on the 4.125 bore he'll have plenty of beef between the pistons in case the op want to spray a 300 shot. After all who knows?

 

4.125 gives you power adder problems. On bore, I wouldn't go past 4.155, head gaskets too thin between cylinders

 

Big valves and high dome pistons. I'm curious to see PTV clearance as well.

 

ptv is fine, these were not off the shelf pistons they are custom made from cp.. brodix actually sent CP the 3d blueprint of the head so that they could make a custom piston and achieve the +16.3 dome piston with no issues. valves reliefs of course were a given in the piston

 

this is why we stayed with the 4.00 stroke... at 4.125 and spraying a lot of nitrous which i am, that leads to major problems

 

the intake is in fact direct ported for 300 !!! we are spraying this motor

 

because with it being a 6.2 aluminum block and although it is sleeved, we wanted to leave some room for additional boring in case something goes wrong and we need to take it bigger.... we also ordered 10 pistons for this same reason in case a piston gets destroyed by the nos lol.

if i max the bore out from the begining and something goes wrong i will have no room to bore it out

 

there has been a lot of debate as of late on the hr vs sr cams. what we have seen personally in our shop is the newer hr cams keeping up almost pound for pound with the sr. this of course without the hassle of valves adjusting and the other issues that can arise with sr

 

these are the valves brodix uses with the br7 sts 273 im not putting a bigger valve in the head

 

pics added !!!

 

Those pistons are a work of art. This is going to be a beast. Definitely in for results.

 

That is looking like a clean build . If its race only i agree w/ the above Solid low lash worth it in a max effort

 

update!!