CAN YOU RUN REC-PORT LS3-STYLE HEADS ON A SMALL BORE 4.8L/5.3L? WILL REC-PORT HEADS EVEN FIT A 4.8L?

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2023-09-21に共有

CAN I RUN FACTORY REC-PORT HEADS ON A SMALL BORE 4.8L/5.3L? CAN I REPLACE THE 706/862 HEADS ON MY 4.8L/5.3L WITH LY6/LS3 HEADS? WILL MY 4.8L/5.3L MAKE MORE POWER WITH HIGH-FLOW, FACTORY REC-PORT HEADS? HOW MUCH POWER ARE REC PORT HEADS WORTH ON A 4.8L/5.3L? WILL THE REC PORT HEADS EVEN FIT ON THE SMALL-BORE MOTORS? CAN YOU NOTCH THE BLOCK TO MAKE THE REC-PORT HEADS FIT? CHECK OUT THIS VIDEO WHERE I DIVE INTO THE INSTALLATION OF A SET OF FACTORY L92 821 HEADS ON A SMALL BORE 4.8L/5.3L? USING THE SECTIONED ALUMINUM BLOCK FOR VISIBILITY, WE CAN CLEARLY SEE THE INTERFERENCE BETWEEN THE BIG-VALVE 821 HEADS AND THE SMALL BORE 5.3L CYLINDERS. CAN WE MAKE THEM WORK?

コメント (21)

@DillonAuto 9ヶ月前

It's good to know others will still experiment, trial and error with things that are important. Like going fast in a car.
@loundclear9279 9ヶ月前

Pro maxx extreme 240 heads a rec port and for 3.800 bore That would be interesting as well. But yeah a 5.3 with a 300 plus cfm head na will be spun to the moon but will be mean on boost
@kimmorrison9169 9ヶ月前

I Wondered about this swap, Now I know. TY for showin us!
@Obshowersyndicate 9ヶ月前

Nothing a grinder can't handle
@GrandPitoVic 9ヶ月前

Wow you Def answered a question I've had on my mind for the past few years since I've been watching you. Thank you sir. More great information sir.
@mariotillery8459 1ヶ月前

Just like the 348/409 Blocks and heads swaps.
@Turbogto_guy 9ヶ月前

Now this was a damn good video.
@davidreed6070 9ヶ月前

Pro max has a rec port head that they have put a smaller valve and moved it over to work on the small bore engines. That should work well
@yepyep340 9ヶ月前

Well HOW COOL WAS THAT! TY
@bobjensen7136 8ヶ月前

Thanks for your demonstration. Sounds like the same problem that Chevrolet had that similar problem with the 348 and 409. Also the possibility of hot spots in the cylinders at the point of the head gaskets and a little way down the cylinder wall. In other words it would really complicate those arias nearest the valve and the cylinder walls too.
@dreece2000 2ヶ月前

Your my hero Richard
@Sir.VicsMasher 9ヶ月前

Edelbrock makes bolt on LS3 style rectangle port head for small bore LS #61319.
@billybadass411thefirst9 9ヶ月前

You so are awesome!
@Airman.. 9ヶ月前

the LS Guru
@Nafskie 2ヶ月前

I am runnin ls7 heads on my stroked ls3, the exh valve was the main issue and we machined it to give 0.030” valve to cyl wall clearance.
@peted5217 9ヶ月前

I solved this by trading for a 6.2 block. I used LT pistons, milled to fit chamber, and give slight compression boost. PVC MUST be ck'ed. Very tight !
@youritake8618 9ヶ月前

This would make for an interesting build if combined with that big bore 4.8 idea
@stellingbanjodude 9ヶ月前

A set of custom pistons could resolve some of your problems, domed pistons to bring back compression, then move the rings a little further down the piston to allow for adequate clearancing for the valve pocket. Bada bing bada boom
@realazliving 9ヶ月前

I’m going to go out on a limb and say yeah grinding it out like that doesn’t seem fine. Also you probably will affect the flow with part of the valve in a pocket like that. Cool video was guessing those heads would be fine. Oh, and that chunk you would have to grind out also adds as the the compression chamber volume.
@mickmagnetta6264 9ヶ月前

good vid