SpadzSaleen 10 Report post Posted July 28, 2010 Hello everyone, I'm very new to this site and the whole building a mustang world. I have a question that needs an Engine Guru to answer. I recently bought a 1970 Mustang Mach 1, the vehicle came with no motor so i went to a local performance shop and they are building me a 351w. Now he included the block for free for me and when we looked up the casting number it came up as a 1984 block. My question is, I want to put in a top loader. Will i be able to put in a 1969-70 era 351w bellhousing?? Are the blocks the same from 1969 all the way up to 1984?? Thanks for the help! Quote Share this post Link to post Share on other sites
Max Power 74 Report post Posted July 28, 2010 I believe the bellhousing mounting should be the same. There are other differences in the newer motors like timing covers, water pump rotation, belt drives etc, but I believe the bell should work fine. Quote Share this post Link to post Share on other sites
LoneWolf2U 136 Report post Posted July 28, 2010 While the bells should be the same, Having a Performance Shop building the eng you might give a good aftermarket schattersheild some thought. Quote Share this post Link to post Share on other sites
SpadzSaleen 10 Report post Posted July 28, 2010 Thanks for the replies! Thing with scattershield bells is in Canada they want almost 600-1000 bucks for one! I should have added that my car is strictly going to be cruising with an occasional fun, no drag strips for this car. So i feel spending that much on a bellhousing would be crazy. Quote Share this post Link to post Share on other sites
70mstang 11 Report post Posted July 28, 2010 As long as the block didn't come out of a truck everything should be fine. If the used block has the flywheel and came off a truck then the flywheel will not fit in a newer bell housing. They need a 157 tooth flywheel. Since you're going to use for cruising, you may want to look into a T5 set up so you don't burn so much gas. Quote Share this post Link to post Share on other sites
SpadzSaleen 10 Report post Posted July 28, 2010 The Block might have come from the truck but i am buying a new flywheel anyways. What do you recommend? 157 tooth or 164 tooth? As for the T5 setup, ive looked into it the cheapest anyone around here can do is well over $4500! :( Quote Share this post Link to post Share on other sites
rwcstang 201 Report post Posted July 29, 2010 hrm if its out of the truck i toss it and get a early 351w block. as for the bell housing i agree with the statements above. but my question is what kind of re-build are you doing? a stock rebuild or a mild-performance rebuild? seems like your spending a pretty penny. Quote Share this post Link to post Share on other sites
SpadzSaleen 10 Report post Posted July 29, 2010 Basically all the guy is using is the block out of the original motor. Its going to be all forged internals, with about 450-500 hp at the motor. So id say mild performance. The car is only going to be a occasionally weekend cruiser with some power. Quote Share this post Link to post Share on other sites
69gmachine 15 Report post Posted July 29, 2010 (edited) The E3 and E4 351W castings ('83 and '84) were both truck HO blocks; very stout and much beefier than the D2 or D4 castings that were for cars. They will easily hold 600 hp all day long when set up properly. The truck rods were also better than what came in the cars as they had spot faced shoulders instead of broached. They are good to over 500 hp and 6200 rpm, so unless you're building something radical, I would re-use them as well. Edited July 29, 2010 by 69gmachine clarification Quote Share this post Link to post Share on other sites
Rcodenewf 44 Report post Posted July 29, 2010 Sent you a PM SpadzSaleen. Did you get it? John Quote Share this post Link to post Share on other sites
