Are there any differences between a 1987 vette L-98 shortblock, and a f-body Shortblock of any year? Every part should be interchangeable right?

 

I think the only difference in the shortblock is the cam. someone correct me if Im wrong.....

 

not sure if the Vette got 4 bolt mains, but everything will interchange

 

The Vette L98 got the 4 bolt main. Fbody got 2 bolt. Vette got the alunimum head. Fbody cast. Other small differances. Every part should be able to swap.

 

did they do the 4bolt in 87 my buddies 86block was a 2bolt

 

I do believe all L98s are 2 bolts.

 

correct

a 4 bolt L98 was never made

your thinking of LT1's

vette and fbody LT1s were 4 bolt

while impala LT1's were 2 bolt

 

nope, only vette LT1's were 4 bolts from the factory, replacement blocks could be 4 bolt IIRC, The LT4's were 4 bolts also

 

So the cam and pistons are the same? The heads are the only reason for a higher compression ratio correct? Any idea on what size cam is in the block?

 

My original motor in my 86 vette with aluminum heads was only a 2 bolt with a 1 piece rear main seal.

 

As mentioned above, ALL L98s were 2 bolt whether in a 85-91 Vette or 87-92 F-body.

 

Doesn't really matter 2 bolt or 4 bolt anyways. How many people can break a stock chevy 2 bolt? My 86 stock bottom end went 12.363 @ 112.04 and ran strong for over 5 years drag racing it every other weekend and about 25,000 really hard street miles. I never broke anything on the bottom. That car was driven to the track everytime (85 miles each way) and never stranded me. The only reason I retired it was that the valve guides wore out. My new motor is a 400 bored and stroked to 420 cu. and guess what - its a 2 bolt!!! I have all the faith in the world with chevy bottom ends as I have never ever broke a crank or spun bearings. Ask a ford guy about their small blocks (very prone to splitting right down the center). Thats why chevys rule and always will.

 

I had a 90 vette engine, it's cam was the same as a ZZ-4, not sure if it was original or not, it was a 2 bolt main engine, it also had a windage tray, the harmonic balncer was different (not quite as thick as a 89 TBI 305

 

Vette L98s are 4 bolts, the motor is exactly like a ZZ4. so anyone who wasted the $3500+ for a ZZ4 could've just bought a corvette L98 from a junkyard for like $800 and spent the difference modifying it.

 

How can you guys even compare a vette bottom end to a ZZ4?

ZZ4's have...
Forged Crank
Forged PM Connecting Rods
4-Bolt block

Vette's have the same parts as the L98 ....
Cast Crank
Cast Rods
2-Bolt

They are completely different.

Tim

 

As tim already pointed out, besides both displacing 350ci, the vette and ZZ4 share nothing in common.

And, also as already mentioned in this thread, Corvettes DID NOT get 4 bolt mains. Thats an old wives tale that has been proven false by the legions of vette owners who have had their engines apart over the years.

 

My vortec block is a 4 bolt.

 

The only thing they do share is the 113 head CASTING, but the ZZ4 has an LT4 valvetrain.

#1 I will also second the fact that ALL L98's are 2 bolt main.
#2 The cam profile may have been slightly different in the vette depending on the year model. If it was, it wasnt much.
#3 The vette does have a higher comp. ratio, because the 113 D-port aluminum L98 heads have 58cc chambers.
#4 I dont see any reason why they would not be interchangable.

 

Nope, not the original cam

 

My stock L98 is an 8 cylinder ... free post!

Tim

 

my bad, about the LT1, you are correct

i was thinking that the vette and f-body got aluminum heads
while the impala receieved iron

me

 

Vettes got aluminum heads in mid-year 1986. Mine is an early 86 Vette and had iron heads.

It is a 2 bolt block with a one piece rear main seal; neutral damper and weight on flex-plate.

Jake