If I have a 4 inch bore block ('90 350) and I put in an L99 crank with rods then I get a 302.

Has anyone done this (from this board) before?

thx

 

It will be same as any other small block swap. I think those little 302 motors are cool. If only GM would have left 4" bores on all motors the 305 might have been more of a performer. What in gods name possessed GM to use a 3.736" bore anyways . Good Luck with your swap.

 

if GM kept 4" bore in all their motors, then the 305 would be a 350

 

But the 305/350 of the 80's were used like a low-performance / high-performance option. The 4" bore was available on the 302/327/350 just used different strokes so they could have used one block and saved cost not having to produce multiple blocks. They should of just used the 302 or 327 and then the 350 for high-performance then at least us lower performance guys would had a motor that would have responded better to mods. But it’s a lot of woulda, coulda, shoulda but we 305 guys are just stuck with a 3.763 bore o well.

 

Not exactly. The 302 was a rules-limited "production" engine. The 4" bore was a good choice, regardless of what else they were using it for.

The 307 was closer to "use what we have" thinking.

 

62-68 327 2-bolt small journal
67-68 302 4-bolt small journal
69-(vary) 327/350 2(327 was 2bolt only) and 4 bolt large journal

so, technially, there were three different blocks used

 

No small journal 4-bolts.

'69 302 used the same block as the 327 & 350.

You could go through the same exercise with cranks.

 

Of course, none of the responses yet have anything to do with the originator's thread question, which in essence is, "Has anyone (from this board)put an L99 crank in a 350 block to make a 302?"

I think the answer to that is, "Yes," but without doing a , which the originator is fully capable of doing, I couldn't say for sure.

 

I am enjoying the debate

will search later

 

My mistake, just called my engine guy..

yah, i forgot to mention the 302/327/350 were the same block in '69


And I started a thread about this over a year ago...

https://www.thirdgen.org/techbb2/sho...&highlight=302

 

One thing I should bring up I hope your not going to use a stock TBI or TPI unit a 302 likes to rev very high to make power.

 

Planned on using a modified TPI, Accel/AS&M combo.

 

better be a tpi than can breathe wonderfully into the 7000-8000 range

 

how you going to get a two piece seal crank into a later block LOLOL

 

where did he say he was using a later block?

 

The L99 crank is the same as an LT1 crank, but with a 3.00 stroke instead of a 3.48 stroke.

I know that for sure, but I'll let someone else that knows more say if that crank will work in a Gen 1 block. I *think* it will, but I don't know for sure.

 

The crank will fit but keep in mind that the LT1 and L99 do not have a keyway on the crank snout for the damper. I can't remember whether the hole in the snout is the same thread as the gen I's. If you can find a machine shop that will help you out this would make a cool build. I am addicted to revs. My other project car is powered by a b18.

 

They do have the keyway, it is the hub on them that is not slotted for the keyway.

 

...10051118?
2pc rear main seal to 1pc adapter
im pretty sure that would do the trick

 

Do it and run a stealth ram! Find out how well it breathes up there... i know theyr still pulling @ 6000 rpms....