[PontiacJim1959]

Originally Posted by bobzdar

455 block with 428 crank is just an .030 over 428 (or .060 over 421) for 434 inches.

GM Corporate would have never allowed it as it would have upstaged the Camaro SS - which did get the 427CI.

Baldwin-Motion Performance offered the SS-427 Camaro and was "guaranteed to run 120MPH in 11.50 seconds." $3,595.00 and its all yours.

[goatwgn]

Originally Posted by bobzdar

455 block with 428 crank is just an .030 over 428 (or .060 over 421) for 434 inches.

Yes. but it does give someone the option of using a 4 inch stroke in a more readily available block. A lot of people have done this. (Should have clarified it in my original post) Lots more 455 blocks than 428s. Plus, you get a few more cubes with overbores up to .060.

[PAUL K]

Before custom pistons came down in price and forged cranks weren't available we built quite a few 455/4" stroke combos. We used a 4.185 SRP piston, 6.700 long BBC rod and off-set stroked the crank to 4.060. It ended up at 446 cid. It was easy to hook, loved to REV and screamed on nitrous.

Here's a video with details for one I did for my car;

https://www.facebook.com/PaulKnippen...8947272263378/

That's definitely one of my favorite engines. It has great street manners and would run mid-tens effortlessly.

[goatwgn]

Originally Posted by PAUL K

Before custom pistons came down in price and forged cranks weren't available we built quite a few 455/4" stroke combos. We used a 4.185 SRP piston, 6.700 long BBC rod and off-set stroked the crank to 4.060. It ended up at 446 cid. It was easy to hook, loved to REV and screamed on nitrous.

Here's a video with details for one I did for my car;

https://www.facebook.com/PaulKnippen...8947272263378/

That's definitely one of my favorite engines. It has great street manners and would run mid-tens effortlessly.

Nice run!!!! This is the type of engine I was referring to.

[PAUL K]

Originally Posted by goatwgn

Nice run!!!! This is the type of engine I was referring to.

Thanks! I kind of figured that's why I made the post. The other nice thing is the 455 block has both sets of motor mount bolt holes so it will fit in any Pontiac. The 428 takes some effort to put in a second gen Firebird and a few others.