djermyn03

http://www.summitracing.com/parts/CM...ComboContents/
http://www.summitracing.com/parts/SUM-G9003/

Just curious I believe everything is a stock l48 from what I was told But i do believe it was rebuilt buttttttt Can someone ball park what i'm looking at here?
Compression Ratio?
Hp?
Torque?
Thanks

Tim H

Cam is weak but the other good parts will wake the engine up.

Ralphbf

Have the headers on my 75, fit and work great.
There was a paper in the box from Hooker Headers about the headers.

I'm guessing 300hp

My set up which is close to this one is good for up to 365hp.
My cam is about what your running.

If we choose different cams we could get more power, but
this should be a fun and very drivable set up.

Enjoy

Ralph

billla

The cam is a little under what the heads can deliver, but assuming around 230 CFM flow expect around 325HP at the crank, max.

You can't make any assumptions about doing a top, especially if you don't know what the shortblock consists of. You need to check the deck height and at least estimate the piston cc to make a good estimate of CR. You also need to VERY CAREFULLY check the valvetrain geometry.

Ralphbf

One more thing.
Roller tipped rockers.

They will cut down on cam to lifter pressure.

PM me and I'll give you an eBay link to the ones I bought

Ralph

Lon Wayne

Return: yep that's what I would do you can almost by a crate engine for that dough.
Are you just doing the top end ??
Did you think this out or did you just Jump into this puddle? man good luck take the engine all the way down to the block and have it": magna fluxed (checks the block for cracks) ,the eye cant see. or your just spinning your wheels .Per say you will need to check the crank journals replace the oil pump and screen. AND ALL THE BEARINGS.
Don't spend all the time its gonna take to rebuild the engine, and not do it correctly or this will be your next post

" Something not right about newly re-built engine"..JMO

billla

Roller-tip rockers are stiffer than stamped-steel rockers, but they don't reduce "cam to lifter pressure". If anything, as they're stiffer - they increase it...which is a good thing.

HamadUP

Actually they carry two main benefits, to put less stress in the valve stem guides, and to handle the higher lift cams that the ordinary stamped steel slotted rockers wont handle.

billla

Full roller rockers this may be the case to some extent - roller tip rockers, not so much

DRIVESHAFT

If you ever actually watch an engine run while using roller tip rockers, you will see that there isn't any rolling going on.
Your valve train geometry would have to be pretty out of whack before the roller tip becomes of much benefit.
Most of the benefit from roller rockers is in the roller fulcrum.

HamadUP

I was refering to the full roller rockers, I'm not a believer of a roller-tip rockers, I'd rather put a stock stamped steel GMs instead.

Ralphbf

So what about the bottom end?

At 90,000 I had no ridge in my cylinders so I re-ringed the engine, rolled in some new bearings and a Mildon pump with a new spring.

Shifting from 1st to 2nd at 40mph it squeals the tires pretty good.
That's at 4500rpm.

Ralph

With my ZZ4 heads you can see the roller tips working.

My mechanic told me to buy them because they reduced cam lifter pressure.

Ralph

Ganey

Edelbrock says 310HP & 375 TQ. A match for your stock auto.