LesPaulGoth

Hey guys, I'm gonna keep this short:

Basically, my current engine is a mystery. It came in my 1990 IROC when I bought it. Used to be a 305, but I checked the head casting numbers and it ran back to a 350 engine. Heads are 64cc and have a 72degree centerbolt configuration, and mortec says that they came in crate engines as well as Gen I Engines and is good for 285-300hp. Now, I thought the heads from this gen came with GM L98 heads...where the hell are these heads from?? This is a mystery I need to solve before I decide to get a new cam. Are these vortecs??

Mkos1980

Whats the casting numbers under the valve covers?

LesPaulGoth

Here's what I found under the driver's side valve cover:

Head casting # 14101083

D219

Big random #3

LesPaulGoth

ttt for the night guys.

thirdgenrallysport

hard top or ttops?

89Vert

87-up 350 GenI, also used on crate motors, 285 or 300 hp, 64cc chambers, 72' center manifold bolt angles

get a block casting number it'll give you more info

LesPaulGoth

Yeah, I already ran that info on Mortec's site, thanks though. Ill try to get the block number, but I thought the L98 motors came with 58cc heads?

TTops btw. And this isnt a stock motor, it was dropped in by a previous owner.

thirdgenrallysport

you need to get that casting number on the passenger side behind the block.

89Vert

87-89 you could get a t-top 350

LesPaulGoth

I'm aware, but like I stated before, the car came factory with a 305 (from carfax.com and hence ttops) and the previous previous owner dropped in a 350. I know it's a 350 because all the signs add up. First off the head casting numbers are for a 350 engine, there is 300,000 miles on the od, it's got 5.7 trim that was put on poorly and has fallen off half way, there are dents on the corners of the valve covers, suggesting that it was dropped in on a hoist with chains...more power than a 350, lol.

I'll find the block casting eventually, but for now all I wanted to know was did the Camaros of this generation come with 64cc heads as well as 58cc's? I was lead to believe they all came with 58cc's and mine are 64cc.

Z28SORR

Just means it's a one piece rear seal and probably a roller cam. Does not have to be an L98 and by the looks of things it's not.
What does it have for an intake TPI or Carb.?

LesPaulGoth

TPI intake

LesPaulGoth

TPI intake

Mkos1980

083 are L98 Cast 64cc heads. Your thinking of the Corvette L98 Aluminum heads. Those have 58CC with a cast number of 113. You have a 350 TPI L98 B2L motor.

Mkos1980

NO Thirdgen F body came with 58cc heads that was a 350. 305's has 58cc head with a part number of 081