96capricemgr

iTrader: (1)

Yeah you will see custom solid rollers with 112LSA and they are lumpy because the long duration makes for overlap.

The "hard to tune" idea comes I think from the earlier computer setups like the TBI.
108LSA with a mailorder tune here, can't be that hard if I got it handled well enough mail order.

Puck

iTrader: (17)

My cam is 109 because the core used would not allow a 107 LSA, 109 was the tightest.

oldschool

iTrader: (1)

Just curious...what exhaust setup are you running?

wht97ws6ta

Exhaust is pacesetter long tubes with a pacesetter y pipe that I cut the merge point out of and used a flow master 3 into 3 1/2 merge collector with a 3 1/2 to 3 flow master venturi reducer. I used a 3 inch mandrel u bend and cut it down the center of the bend and the kept cutting it back in the bend till I snuck up on the correct angle. Cat back is a borla 3 inch. I didn't mention earlier that the throttle body is a stock unit bored 52mm with a thinned shaft and a hypertech foil that was blended. Throttle body turned out to be a sexy piece. I believe the stock unit is better than most after markets in more than one way until 52mm won't cut the mustard.

Ed Wright

iTrader: (1)

Sometimes you see 106.

I don't know how your getting away with .022", mine touch at .036", I would be pinching the top rings at .022".

wht97ws6ta

The one thing I did notice when I balanced the crank was these scat rods where heavy on the rotating end. The srp pro pistons are pretty light with the short pin and fsr skirts. Only thing I can think of is the rotating mass to reciprocating mass is split big towards the rotating. Bob weight was around 1840 iirc. The pistons were around 430 I believe with a 115 pin weight. So recip is pretty light in this one. The first go around with this motor I overlooked the oil galley plug that goes in the galley that goes from the rear main cap to the oil sending unit. It will bypass the oil filter with it out. We typically don't take those out when cleaning but our teardown and clean up guy at the time took it out. (Not blaming him it was my fault I missed it) but it turned a rod bearing. I said all that to say it barely was hitting then with a turned bearing. It didn't cave the deck on the heads at all.

Ed Wright

iTrader: (1)

How thick are your head gaskets?

wht97ws6ta

.027 cometics. Pistons are .005 out.

cardo0

VERY VERY common in LT1s when people think outside the Comp catalog. Most of us running "custom cam" setups on NA LT1s are running 108-110 sometimes you even see 107.

Duh! "Most of us" wow. Since u run a 108 too that must mean "most of us" now. Just because i already bought a 109 LSA cam to go in the camaro that means i can run my mouth off too. Gee, i can be a most of us now. Nice try but id need a six pack to before associating with u - i need to send my cam back now.

cardo

Thx for the replies wht97. I appreciate the feedback. Just an ongoing thing with the peanut gallery here.

Ed Wright

iTrader: (1)

Wow! I hope you don't do a lot of damage to it. If you spin it very high, your are going to be smacking pistons against heads. Not a guess, that's based on having built SBC race engines for over fifty years now. Those are the same gaskets I use. Sure as heck don't stick my pistons out of the hole with them.
At LEAST .010" down with those gaskets. You mentioned "turning a bearing", if you have it back apart to fix a spun bearing, you would be wise to deck the pistons .015", or buy thicker gaskets.

Btw, that oil galley plug you mentioned? If you ever buy a new Bow Tie block from the GM dealer, it's not installed either.
Good luck!

wht97ws6ta

No that was back a couple of years ago. Its all together in the car now. I was just on the dyno Friday with it. Spun it 7100 a few pulls. Before it turned the rod bearing the first time it saw 5 or 6 engine dyno pulls to 6800 then some miles in the car. Only piston that made contact was the one with the spun rod bearing. Never pinched the ring land then.