[blue71ta]

Welcome to the PY forums.
I would go with a Pontiac 455. You can start with a 400 block and use a stroker kit.

[anthonygazz]

Originally Posted by blue71ta

Welcome to the PY forums.
I would go with a Pontiac 455. You can start with a 400 block and use a stroker kit.

any particular reason why?

[weranc55]

I'd go with a ls motor.

[bird72]

I have heard there are stroker kits for Poncho 350's. I believe 383 c.i. (?) correct me someone if wrong on CI. That kind of intrigues me. not so much as "the best option" but as a cool thing to do to be different with a block one already has. The kicker then is either modding the typical lopo 350 heads or swapping to better heads. I like the idea of working the original heads (screw in studs, roller, massage for flow, valves, etc). If I keep my 72 it so so spot on original that I could see that route for me. Only visual change is go to a factory 4V intake card and factory style dual snorkel air cleaner. That way, pop the hood, looks factory. Also I would go ram air cast exhaust manifolds. Very clean factory look with 375hp capability I believe, along with great torque.

[TimeWarp]

I think he is referring to being able to stay with the 3" main that the smaller bore engines have (455 uses a 3.25") and that is an advantage for spinning high rpm, but still going for the bigger cubic inches.

If doing an LS you might want to think about going turbo instead of supercharger. You can build way more power if you want to and custom place the turbo for your needs. No belts to keep an eye on, etc.

Or just buy the LS motor I have...its a turbocharged LQ4 block (the one all the turbo builders use), All Pro stage 3 heads built for boost by a professional with turbo and custom dyno tuned computer (800 to the rear wheels, and that was tuned mildly). She was built to handle 1200 hp. Drop her in. lol

I also have my custom built 1200 hp turbocharged 455 for sale in the classifieds here, and THAT is show worthy. Just sayin...lol

http://forums.maxperformanceinc.com/...d.php?t=761839

[anthonygazz]

Originally Posted by TimeWarp

I think he is referring to being able to stay with the 3" main that the smaller bore engines have (455 uses a 3.25") and that is an advantage for spinning high rpm, but still going for the bigger cubic inches.

If doing an LS you might want to think about going turbo instead of supercharger. You can build way more power if you want to and custom place the turbo for your needs. No belts to keep an eye on, etc.

Or just buy the LS motor I have...its a turbocharged LQ4 block (the one all the turbo builders use), All Pro stage 3 heads built for boost by a professional with turbo and custom dyno tuned computer (800 to the rear wheels, and that was tuned mildly). She was built to handle 1200 hp. Drop her in. lol

I also have my custom built 1200 hp turbocharged 455 for sale in the classifieds here, and THAT is show worthy. Just sayin...lol

http://forums.maxperformanceinc.com/...d.php?t=761839

Good god that thing is a work of art! im all about making a big power car, thats what puts a smile on my face and love in my heart lol. unfortunately my father is more into a show more than go type of build here. he shot down the idea of slapping a turbo on it so its basically either bore out the 350 and put an old style blower through the hood or just drop an LS in it. we will be doing a full tubular front with disc brakes and all that so originality isnt the biggest concern. it will have full custom paint custom wheels all that fun stuff as well.

one other thing i was trying to understand is i read somewhere that all the factory pontiac firebird/TA blocks start as the same cast and are then just bored to whatever cubes designated for the model. seems there is some truth to this but not as straightforward as it seems? we dont have any desire to run the stock 350 we would want the 455 but would rather pay for the LS than the 455 if we couldnt convert the 350-455...i hope this is making sense