GT40P Heads on my stock short block October 24, 2008, 01:57:10 PM my 88 stang still has a stock short block, pistons and stock cam.I'm putting on some GT40P heads and was wondering about the lift and spring rates. Would 1.7RR be a good idea or are the stock springs too wienie to be leaving the 1.6s behind. Any info would be a great help. Thanks Quote Selected
GT40P Heads on my stock short block Reply #1 – October 24, 2008, 02:42:50 PM The stock GT40P springs *should* be ok with the stock cam and 1.6 roller rockers. Really though you would have to check to see how they would be with 1.7 rockers. It depends on how used the heads are/how worn the springs are..... Quote Selected
GT40P Heads on my stock short block Reply #2 – October 25, 2008, 03:13:19 PM So I just pulled the passenger side head off, D8OE cast into it, now my question is, where did the E7s go? But on other thoughts, I've read very little about D8OEs, can someone elaborate a little bit?Also my pistons have reliefs cut into them, but also 0.040 punched into the top of them. Whats the deal there? This thing bored out already? Its an 88 Stang for anyone who don't know. I'm gonna go start digging up the old receipts now. Quote Selected
GT40P Heads on my stock short block Reply #3 – October 25, 2008, 05:30:50 PM Seems the .040 tells you something.Measure the cylinder,show a pic. Quote Selected
GT40P Heads on my stock short block Reply #4 – October 25, 2008, 11:06:16 PM "D8OE" were also on H.O. 302s through '84 (and '85 w/ CFI) and S.O. 302s for a couple years past that (until they also got roller cams like the H.O. did).http://www.allfordmustangs.com/forums/5-0l-tech/72317-302-351-cylinder-head-identification.htmlI'm doubting that that stang has the stock engine, at least completely stock... Quote Selected
GT40P Heads on my stock short block Reply #5 – October 26, 2008, 07:26:37 AM THey may have went to '85 on the S.O motor, but AFAIK, no SO with SEFI had anything other than the E6's from the factory...Your motor's bores .040" over FWIW so it aint runnin the stock pistons....however they may be stock style.Any more description/picture info you could give on them can only help us tell you what they are. Is there a small dish along with the valve reliefs? Quote Selected
GT40P Heads on my stock short block Reply #6 – October 26, 2008, 11:28:34 AM I'll measure it and try and get a pic while I do the driver side tomarrow, gaskets will be here in the morning, I ordered some gaskets for a 93 Cobra figuring it would be appropriate. The passenger side is ready to get put on, I'm starting to wonder what the cam says, or if these are forged pistons even or not. There a way to tell from what I can see on top? This explains why all the mustangs at the local 1/8 track are a second faster than me when no mods at all, and I got plenty. Despite being a convertible or not.Should I use the stock rockers from the D8s or the GT40s? Quote Selected
GT40P Heads on my stock short block Reply #7 – October 26, 2008, 11:34:23 AM I'd run the 1.6 rockers ,better springs are a good idea. Quote Selected
GT40P Heads on my stock short block Reply #8 – October 26, 2008, 11:35:47 AM No dish, When I last built the motor for my 84 Cougar it had the same looking pistons with the valve reliefs cut into them. There is rings from inside to outside, like the rings on a tree trunk, those are seen on the pistons, I don't think my forged pieces from the cougar motor were like that. If I got a lame motor, I'm gonna be pissed. Quote Selected
GT40P Heads on my stock short block Reply #9 – October 26, 2008, 11:37:19 AM Which ones are gonna be the 1.6s? The ones that came on the GT40P heads? Quote Selected
GT40P Heads on my stock short block Reply #10 – October 26, 2008, 11:41:26 AM I'll measure it and try and get a pic while I do the driver side tomarrow, gaskets will be here in the morning, I ordered some gaskets for a 93 Cobra figuring it would be appropriate. The passenger side is ready to get put on, I'm starting to wonder what the cam says, or if these are forged pistons even or not. There a way to tell from what I can see on top? This explains why all the mustangs at the local 1/8 track are a second faster than me when no mods at all, and I got plenty. Despite being a convertible or not.Should I use the stock rockers from the D8s or the GT40s? Quote Selected
GT40P Heads on my stock short block Reply #11 – October 26, 2008, 11:51:04 AM the explorer gt40p had the 1.6 ratio,I'd use them,if you're planning on a cam more agressive than stock, you will need different pistons anyways,my 86 tbird had flat tops, i now have the engine thrity over with decent size valve reliefs. take some pics it would help alot. Quote Selected
GT40P Heads on my stock short block Reply #12 – October 26, 2008, 05:06:36 PM Quoteif you're planning on a cam more agressive than stock, you will need different pistons anywaysHe has valve reliefs. And to add, plenty of guys here are running non stock cams on non-valve relief pistons......I'm one of them....QuoteI'm starting to wonder what the cam saysWhat length are your pushrods and what's the casting # on the block? Quote Selected
GT40P Heads on my stock short block Reply #13 – October 26, 2008, 06:32:22 PM I'll measure the rods next I'm in the garage.My pics are too big to attach it seams. I'll have to come up with something else. Quote Selected
GT40P Heads on my stock short block Reply #14 – October 26, 2008, 07:21:31 PM My pics are too big to attach it seamsEmail em to me.....Paul_Flockhart@hotmail.com Quote Selected
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