Im building a budget 305 for my camaro and i have two blocks from thirdgens but with different pistons

Dunno which year but its out of a camaro..


out of my old wrecked 82 t/a (threw a rod)


Which is which? thanks guys

 

WAG the top is the l69

 

Awesome, i got an LG4 in my car right now and the one on top is the one im building. Thank you

 

my L69 looks like the bottom one?

 

L69s had flat-tops, like the top pic. None came with dished pistons. If you have a short block with dished pistons, it isn't a L69 short block.

LG4s had dished pistons like the bottom pic, up until about 86 or so. The last couple of years got flat-tops.

L69s also came with X rods (at least some did... mine had them for instance). Those are the best rods of their day. LG4s got lesser rods. So if that upper pic is really a L69, it's the one to use for that reason as well.

 

Yup, the L69 I pulled out of my Camaro had the flat tops like the top pic, as well as the X-rods that RB mentioned.

 

ok well i personally just rebuilt my lg4 and the pistons are same as that top one with the valve reliefs

 

Awesome It has the "x" on the rods, i talked to the kid i got it from and he said it was out of an 83 z28.

 

Same one I have sittin on my stand right now....

 

My L69-LE9 305 has the flattop piston with 4 valve reliefs, X rods, and 4 bolt mains.

 

I never heard of a factory 4 bolt main 305.

 

'85-up had "flat" tops. As well as knock sensor & electric rad fan.

Didn't happen in 3rd gens. IIRC from earlier posts, his came in a Canadian full sized van.

 

i have an 85 berlinetta... it has no electric radiator fan and the pistons are like the top picture? is there somehting wrong

 

Not necessarily. Is it a Canadian car?