I did a little more sleuthing because I am a curious bugger. If that is a Y8 block with 16 heads it is the 74 SuperDuty and a rare find, Let us know the numbers, I'm dying to find out You will find that all 74 455's (except the SD) were 250 hp with 8-1 comp and the 067 cam, if you want to stay low comp for todays poor fuel and get some real boost go with the 068 cam, it will leap that motor, probably to over 300hp, if you find the heads so so, either rebuild or go with edelbrock which are based on the RAIV heads in either D or round and with the 068 cam you would have a 455 superduty. I have a C-20 with a 327 that runs to 7000 rpm after a relatively inexpensive rebuilt.ĭon't be thinking right off that any 455 is going to be a screamer, if it is really a 74, performance could be very lame, check this site, you need to find the block ID under the passenger head in the front, it would be a WZ or YH etc etc, then look at the center exhaust port on either head and try to figure out what that says, then look around the distributer for the year code, the long set of numbers would be when it was made and the large 2 numbers should say 74 if it is, meaning that is what year car it is meant for, now look at this chart. Those things will rev forever after a good rebuilt. You've got the sweet sweet 4 speed, so putting a nice cam in it and some high flow heads will really wake it up (it's not that simple, but it a little research turns up a lot of info). If I were in your shoes, I'd pull the 350, strip it down to the block, have it machined and cleaned, and build it fresh. Great find if I really want to build a monster. Posted a while ago about a cool one I found with factory 4 bolt main's that was in a Bonneville. I pick up any 60's pontiac block I see if it is in good shape. It'll come back as a 462.035 over with a 4.25" stroke. I am far from an expert, but my 400 block has been in engine jail for 3 years (getting tired of waiting on it). Depending on who you talk to, punching out a 400 or 350 to a larger size is preferable, as you are keeping more iron around the crank. As mentioned, a pontiac block is a pontiac block, the 455's have a different sized crank journal than a 400. Why scrap a perfectly good 350? If it is the at 69 block it has different, more solid build than a 74 smog era block.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |