A guide to building the lil guy. The Mighty 300

For those doing a mild rebuild. The sealed power Hyper pistons are a pretty good price on Rockauto. Only 8.4 compression but a lot better than the stock soup cans. Deck the block.030 and mill the heads .020 and you are right at 9.75 for the iron heads. .030 off the aluminum heads and you are around 10.2. The 75-76 Oddfire V6 rods are like the later 350 capscrew rods but the right length for the 300.

https://www.rockauto.com/en/catalog/buick,1966,skylark,4.9l+300cid+v8,1319206,engine,piston,5620

 

1964 Buick 300 with Buick 350 crank, Molnar Buick 350 rods, D.S.S. SX-Series Forged LS Pistons 3.810 bore, Isky 621270 cam. Ported heads and intake. Intake converted to a single plane for fuel injection once in vehicle. 351 cubic inches of fire breathing Buick fury. Can't wait to get it back in my truck!

https://youtube.com/shorts/47o32qeGlM8?si=UsuWlBRZLB5y5uB0

 

That thing sounds sweet

 

Sean, did you use their 1.215 compression height LS stroker piston? Did you use larger valves in the 64 300 heads? Do you plan to dyno?

 

You could also use this piston with bushed rod and floating pin on a 300 stroker with 350 crank:

1-6230-3800 3800 V6 Buick V6 1 FX Series -6cc Flat Top Buick V6 3800 F – DSS RACING PISTONS

 

Not sure what piston my machinist used. He said it would end up about 9.5:1. We did not go with the bigger valves. Wasn't looking to get huge power out it. More torque than anything and the less weight of the aluminum heads and intake. It's going in my '91 Toyota pick-up to replace the iron '65 I had in it. Of course the simple engine build turned into a complete frame off restoration.

 

Sean, Thanks!

 

Cool.

 

Neat thing about the LS stroker pistons you can get 3.78 bore. Only .030 over. For 9.5 compression you probably used the 1.165 compression height. the 1.215 would be about 10.5.

1860-3780 4.8 - 5.3 - LS1 - LS6 - Stroker Chevy LS SX Series -3cc Flat – DSS RACING PISTONS

 

...and it's red now

 

What did you do with the extra head bolt holes in the TA Rover heads?

 

You don't use them. Same when using 300 heads on a 215. Weird the TA heads would have them when Rover didn't.

 

"It's in the hole" - Bill Murray

 

That's gonna surprise some people...