Building a budget vortec 350 hoping for 11.99's

Engine 350 10:1 compression

4 bolt main 2 piece seal 350 shortblock
nodular iron crank 3.480"
lt4 pm rods 5.7"
-12cc dish pistons

Heads/cam/intake/carb

gmpp small port vortec screw in studs 2.00 1.55 valves
comp xtreme energy 240 246 duration @ .50 .507 .510 lift
comp 1.6 roller rockers
edelbrock aluminum rpm air gap intake vortec
750 cfm holley dp hp carb

exhaust
hooker long tubes 1 3/4" prim 3" collector 3" to 2 1/2' s reducers, 2 1/2" x pipe, (true duals), dynomax ultra flow race bullet mufflers.

rear

built 28 spline 10 bolt 7.625 limited slip differential 4.10 gears moser axles diff girdle

trans

built 700r4 10" non lock up 3400-3800 stall converter

plan to shift at 6500rpms this will be in a no options hard top sport coupe

 

dish pistons and you think it'll be 10:1 ?

Has the engine been zero decked? I think you'd be close, but it'll take some tuning. I'd say 12.20s would be doable for sure.

 

its a gm performance parts shortblock the one they use for the 290hp motor and the 350 ho the head gaskets are the felpro .015" with the -12cc and 65 cc head it calculated to 9.954. anything else i could do to this setup for better results?

 

oh no those pistons will be in the hole a bit, it's not going to be that high of a compression. Maybe 9.3 or so, haven't done the calculations in a while. You'd really want the higher compression with that cam. A smaller cam would work better with the lower compression.

 

I will agre with xpndbl 3 12.20s and comp at about 9.25 to 1 But it is a great economical motor with good power.

 

how much slower do you think it will be if i went with just xe274 and sdpc vortecs?

 

I think it will run fine the way you have it planed out.

 

see any other weak points in this setup other then the pistons. will it be streetable enough for weekend cruising? and im guessing ill be able to run on 93 without problems.

 

Only weak point will be your rear end will break. Yes it will be a great cruiser and I bet it will run on 89 Oct maby even 87 Oct This vortec head dont need alot of timing to run good. And trust me a low 12 sec ride is still a good ride its not as easy as it looks to get 11 sec street cars. If you had a BB or LS1 its a little easier.

 

Do you have the cam card timing specs?
Is the cam installed straight up?

 

Based on the cam specs(XE284H), you're probably a full point down on compression. The Vortecs could handle 10:1 plus (which you need with that cam) providing you watch your total timing and keep the engine/intake cool.
Milling your heads to 60cc will bring things up around 6/10's (to around 9.9:1).
That would help.
You may go quicker with the XE274 if you don't increase the compression.
The estimates from everyone are pretty close I'd think. High 12's. Unless you've lightened your car by 500 lbs.