2021年12月15日 · This posting is for a Pontiac 455 engine, 4 Speed M21 Muncie Transmission, Hooker Super Comp Headers, Holley Carburetor and High Torque Starter all of which are out of my 1970 GTO .

2023年5月31日 · 1971 PONTIAC Engine Project 3500 PONTIAC engine project fresh 4 bolt mains Very nice Fresh Pro Machine Work ,Block , Ported, heads , hipo Valve Job - , many new upgraded parts , Forged rods ARP , valves , intake Performer RPM , oil pan , Camshaft HIPO , Roller Rockers CompCams , ARP , and...

2016年2月24日 · I've got a '71 455 2-barrel, which was running good, when it was pulled out of a '71 Safari wagon. Then I bought a ready to run engine, from my engine guy, and don't really need this one. So, I tried to sell it for $1000--no sale. Then I tried for $800--no sale.

2012年9月25日 · The small valve heads for the 455 that year were #15's, and they came on the big cars, but not the GTO. I looked far and wide for some #64's to use on my '67 400 to drop the compression, and had to settle for a set of #15's.

2017年3月21日 · the most common Pontiac 455 for '70 models was the YH engine with 15 casting heads. This was the standard equipt engine for '70 Bonnevilles. Pontiac built a TON of '70 Bonnevilles, & only a few received the optional big valve 64 casting headed XF engine. Most of those were XF's & went in '70 GP's. the WA, YA/YC 455 big valve engines are what the …

2013年6月14日 · The YH is the engine code that, along with the block casting number and the casting date, identifies the block as a 1970 Model Year high-compression 455 for full-size cars.

2022年8月19日 · For example, the engine in my '69 carries a date code of K278. K=November, 27, 8 meaning 1968. This brings us to another fact you must consider when interpreting date codes. The Pontiac engine foundry would begin casting parts for the following model year at "about" mid-year.

2022年7月7日 · According to the Wallace Racing site, 483677 + YC with #66 heads is a 71 325 HP 455 out of an automatic transmission car. Although it's a little puzzling for a date code that late in the year (August) to still be model year 1971. My understanding is that the engine foundry usually started casting for the next model year around the June time frame.

2024年1月21日 · I'm looking at two blocks. A '71 455 and '69 428. I have a set of '71 '96 heads (103cc) that will run on this engine. What are the considerations, advantage or disadvantage of building the 428 vs the 455? It will be put in a '67 GTO.

2011年11月10日 · Hey all. Could one of your knowledgeable experts help me to understand the differences and pros/cons of a Pontiac 400 versus a Pontiac 455? Which engine has the better reputation? Which one makes more power? Which one can be built to make more power? Why would I consider one over the other? I am in need of a new engine and am trying to …