What was the stock piston to deck clearance on a 72 302cid, and what is the piston cc vol? Trying to figure out what a set of winsor jr. heads with 58cc chambers will bring the compression ratio to. Thanks Tomm
302s up thru 1970 had a nominal deck of .015 inches. minimum deck for blueprinting purposes was .0015 inches. i think it stayed the same thru the 1970s. i think the cupped pistons were -8 cc, but not sure. should be close enought for you to get an estimate if no one else on here can be more exact.
'77 could have had either of 2 piston tops. One was a flat top w/4 valve reliefs, and the other was a dish with 4 valve reliefs. The FT is about 4-6cc...the dish is about 8-10. It could have had either one in the same year model, the difference is in the heads. One head had smaller chambers than the other...and is basically a carryover from '76, and the other had larger chambers (identical to the 351w from '77-?) which used the FT pistons. At least that's what I've seen of them. It's been a while since I've been into a stock 302 lol.
Thanks for the info guys. Trying to figure out exactly what I'm going to do with the 302 in my 72 Grabber. THanks again Tomm
'74 - '77 302's had and extra .023" added to the deck height to lower compression. After that Ford lowered it again. If you build one of these blocks it's common to have .020 cut off the deck.
I thought that was only on the '73-'76 blocks? Deck was 8.236 instead of 8.206..at least that's what I was told.
according to the 2000 motorsorts catalog all 302s 1968-2000 are 8.206. if those years were different how did they adjust for the positive stop rocker studs? all the pushrods were the same in those years. and rockers and tappets.
The plunger in the hydraulic lifter takes up the slack. It's not enough difference to adversely affect rocker arm-to-valve stem geometry. As far as Ford Racing's catalog deck height, yeah I've seen that too. Guess they don't want to admit to all the stupid things they've done over the years. When doing any rebuild it's a good idea to measure everything. You never know what the factory or someone else has done to the engine.
